CN107043656A - A kind of dispersant and wash mill for being used to wash sial phosphorus molecular sieve - Google Patents

Abstract

The invention provides a dispersant and a washing device for washing silicon-aluminum-phosphorus molecular sieves, the dispersant includes solution A and solution B mixed according to mass (0.01-0.3): 1; the solution A includes solvent alcohols, The solute is hydrochloric acid, stearamide or stearyl glyceride or a mixture of the two, glyceryl tristearate; the solution B includes solvent desalted water, and the solute is formaldehyde, polyvinyl alcohol, sodium polyacrylate or alkylsulfonic acid Sodium or a mixture of both. The device used for washing silicon aluminum phosphorus molecular sieve, including filter press, screw conveyor, beating kettle, centrifugal pump, receiving hopper, spraying device, etc. The invention avoids the agglomeration and clogging of the silicon-aluminum-phosphorus molecular sieve after press filtration on the pipeline or equipment, and while washing the silicon-aluminum-phosphorus molecular sieve more quickly, it not only improves the washing efficiency of the silicon-aluminum-phosphorus molecular sieve, but also reduces desalination 40-70% of the water consumption, high degree of automation, easy to promote industrialization.

Description

Dispersant and washing device for washing silicon aluminum phosphorus molecular sieve

technical field

The invention belongs to the technical field of chemical industry, and in particular relates to a dispersant and a washing device for washing silicon-aluminum-phosphorous molecular sieves.

Background technique

Propylene is currently the most important bulk chemical product in the world and one of the basic chemical raw materials supporting my country's economic development. It can be used to prepare a variety of basic organic raw materials. For example, propylene oxide, acrolein, propenyl alcohol, isopropanol, carbon tetrachloride, butanol and the like can be prepared. In recent years, due to the demand for downstream derivatives (especially polypropylene), the demand for propylene has increased significantly. Due to the shortage of domestic propylene resources, it is far from meeting the needs of the domestic market, and the domestic self-sufficiency rate has dropped sharply, requiring a large amount of imports. With the environment of fierce competition in the international market, the development of propylene and its derivatives must adopt the most advanced environmentally friendly technology in the world to achieve large-scale economical production at low cost. The prospect of development and utilization of propylene in China is very broad.

Aiming at the prospect of propylene development in China, the methanol-to-propylene catalyst developed by China Tianchen Engineering Co., Ltd. is mainly a silicon-aluminum-phosphorus molecular sieve, which can make the methanol conversion rate reach 100% or close to 100%, and the selectivity of ethylene and propylene is at 78 % or more, there are almost no products above C5, and the outstanding hydrothermal stability and suitable pore structure of the silicon-aluminum-phosphorus molecular sieve make it more superior in performance, and will be widely used in the future.

At present, there are many devices and methods for cleaning materials such as molecular sieves, and only centrifugal washing, plate and frame filter washing, and filter press washing are specifically involved. When the material is washed to remove impurities such as sol and organic matter in the molecular sieve slurry, the material will be agglomerated after being extruded in the filter, and the agglomeration phenomenon will easily accumulate into hard chunks, which will affect the transportation and beating process. The clean silicon-aluminum-phosphorus molecular sieve is viscous and adheres to pipelines and screw conveyors, causing blockage of equipment and pipelines, hindering on-site operations, and troublesome cleaning of pipelines and equipment. In addition, a large amount of desalted water is required for washing molecular sieves, which is very unfavorable for places where water resources are scarce. Therefore, for silicon-aluminum-phosphorus molecular sieves, seeking a safe and reliable solution to the problem of material agglomeration and sticking to pipes and devices, and at the same time recycling the washing liquid to save water has become an urgent problem in this field. .

Contents of the invention

In view of this, the present invention aims to propose a dispersant and washing device for washing silicon-aluminum-phosphorus molecular sieves to solve the problem of material agglomeration and sticking to pipes and devices, and at the same time, the washing liquid can be recycled to save water Technology.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A dispersant for washing silicon-aluminum-phosphorus molecular sieves, comprising solution A and solution B mixed according to mass ratio (0.01-0.3): 1;

Described solution A comprises solvent, the hydrochloric acid of 3-10% of solvent quality, the stearamide or stearyl glyceride of 0.3-0.8% of solvent quality or the mixture of both; The tristearic acid of 14-32% of solvent quality glycerides;

Said solution B comprises solvent, 0.01-0.03% formaldehyde of solvent quality, 0-15% polyvinyl alcohol of solvent quality, 0-8% of solvent quality sodium polyacrylate or sodium alkylsulfonate or both mixture;

The solvent of solution A is alcohol; the solvent of solution B is desalted water.

Preferably, the alcohol is one or two of methanol, ethanol, propylene glycol, glycerol, n-butanol, isobutanol, benzyl alcohol, and ethylene glycol; the conductivity of the desalted water is less than 5 μS/cm, and the pH 6.0 to 7.0.

Preferably, the preparation of solution A includes the following steps: (1) select alcohol at 30-60° C. as the solvent, and add 3-10% hydrochloric acid of the mass of the solvent and stir evenly; (2) add 0.3-0.8% of the mass of the solvent % stearamide or stearyl glyceride or the mixture of the two; (3) add glyceryl tristearate equivalent to 14-32% of the solvent quality, and mix homogeneously;

The preparation of solution B includes the following steps: (1) select desalted water as the solvent, add 0.01-0.03% formaldehyde and stir evenly; (2) add polyvinyl alcohol equivalent to 0-15% of the solvent mass; (3) add Sodium polyacrylate or sodium alkylsulfonate or a mixture of the two, which is equivalent to 0-8% of the mass of the solvent, is mixed evenly.

The present invention also provides a device for circularly washing silicon-aluminum-phosphorus molecular sieves, including a filter press, a screw conveyor, and a beating kettle; the filter press and the beating kettle are connected through a pipeline, and the pipeline is provided with a first valve and a centrifugal pump ; The screw conveyor is provided with a receiving hopper, and the receiving hopper is located below the outlet of the filter press; the two outlets of the screw conveyor are respectively connected to the product tank and the beating kettle; the top of the receiving hopper is provided with a spraying device , the spraying device communicates with the beating kettle through a pipeline, and the pipeline is provided with a second valve and a centrifugal pump.

Preferably, the bottom end of the beating kettle is connected with a circulation main pipe, and the circulation main pipe is branched into two branch pipes, which communicate with the filter press and the spraying device respectively, and the branch pipes are respectively provided with a first valve and a second valve; A centrifugal pump is arranged on the circulation main pipe.

The present invention also provides a method for washing silicon-aluminum-phosphorous molecular sieves using the above-mentioned device washing cycle, which is characterized in that: it includes the following steps,

1) Inject the above-mentioned dispersant into the beating kettle, and the quality of the dispersant is 0.5-2% of the mass of the silica-alumina molecular sieve to be washed; then inject desalted water of 40-75% of the volume of the beating kettle into the beating kettle as the initial Stir the washing liquid, and turn on the centrifugal pump, so that the washing liquid is evenly sprayed from the spray device above the receiving hopper through the pipeline;

2) The synthesized fresh Si-Al-P molecular sieve slurry enters the filter press for pressure filtration, and the Si-Al-P molecular sieve after pressure filtration falls into the receiving hopper. Transport to the beating tank to form a new mixed liquor;

3) After the fresh silicon aluminum phosphorus molecular sieve slurry is filtered by the filter press, the first valve is opened, the centrifugal pump is adjusted, and desalted water is continuously fed into the beating kettle at the same time, and a part of the new mixed solution in the beating kettle enters the press filter through the pipeline The press filter is carried out, the liquid out of the press filter is discharged out of the filter press, and the filter cake out of the press filter enters the hopper again; the other part of the new mixed liquid is wetted by the spray device to the silicon-aluminum molecular sieve in the hopper, and the wetting The silicon-aluminum-phosphorus molecular sieve is transported to the beating kettle again by the double-screw conveyor; the volume ratio of the new mixed solution entering the filter press and the new mixed solution entering the spraying device is (20-40):1;

4) Repeat step 2) and step 3) for a total of 2-5 times. When the pH of the solution in the beating kettle is 6.6-8.2, close the second valve, stop feeding desalted water into the beating kettle, and at the same time, the double-screw conveyor rotates in reverse , to transport the filter cake from the filter press to the product tank.

Preferably, step 5) is also included, opening the first valve and the second valve, feeding desalted water into the beating tank, adjusting the rotation of the double screw conveyor, and cleaning the entire device system through the circulation of desalinated water.

Preferably, during the whole washing cycle, the solid content of the silicon-aluminum-phosphorus molecular sieve in the mixed liquid in the beating tank is lower than 34%.

Preferably, the flow of desalted water into the beating kettle keeps the liquid level in the beating kettle between 50-75%; the diameter of the pipeline is 50-90mm.

Preferably, the volume of the fresh silicon-aluminum-phosphorus molecular sieve slurry processed once by the filter press is 50-180% of the volume of the washing liquid in the beating tank.

Compared with the prior art, the dispersant and washing device of the present invention have the following advantages:

The dispersant and washing device provided by the present invention avoid the clogging and clogging of the silicon aluminum phosphorus molecular sieve after pressure filtration on the pipeline or equipment, not only improve the washing efficiency of the silicon aluminum phosphorus molecular sieve, but also reduce the 40% of the desalted water -70% usage, high degree of automation, convenient for industrial promotion.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the simple structure diagram of the washing device described in the embodiment of the present invention;

Explanation of reference signs:

1-Filter press, 2-Hopper, 3-Beating kettle, 4-Screw conveyor, 5-Product tank, 6-Circulation main pipe, 7-Branch pipe, 8-First valve, 9-Second valve; 10- Centrifugal pump; 11-spraying device.

detailed description

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

A device for circularly washing silicon-aluminum-phosphorus molecular sieves, characterized in that: it includes a filter press 1, a screw conveyor 4 and a beating kettle 3; the filter press 1 and the beating kettle 3 are connected through a pipeline, and the pipeline is provided with a first A valve 8 and a centrifugal pump 10; the screw conveyor 4 is provided with a receiving hopper 2, and the receiving hopper 2 is located below the outlet of the filter press 1; the two outlets of the screw conveyor 4 are respectively connected to the product tank 5 And the beating kettle 3; a spraying device 11 is arranged above the receiving hopper 2, and the spraying device 11 is connected with the beating kettle 3 through a pipeline, and a second valve 9 and a centrifugal pump 10 are arranged on the pipeline.

The filter press 1 is communicated with the beating kettle 3 through pipelines, and the pipeline connecting the spraying device 11 and the beating kettle 3 can be two independent pipelines, and the following methods can also be adopted:

The bottom end of the beating kettle 3 is connected with a circulation main pipe 6, and the circulation main pipe 6 is branched into two sub-pipes 7, which communicate with the filter press 1 and the spraying device 11 respectively, and the two sub-pipes 7 are respectively provided with first valves 8 and the second valve 9; a centrifugal pump 10 is provided on the circulation main pipe 6.

Embodiment one

A dispersant for washing silicon-aluminum-phosphorus molecular sieves, comprising solution A and solution B mixed in a mass ratio of 0.05:1;

Said solution A comprises solvent, 4% hydrochloric acid of solvent mass, 0.4% stearamide or stearyl glyceride or the mixture of the two; 16% tristearin of solvent mass;

Said solution B comprises solvent, 0.01% formaldehyde of solvent mass, 4% polyvinyl alcohol of solvent mass, 3% sodium polyacrylate or sodium alkylsulfonate or a mixture of the two;

The solvent of solution A is alcohol; the solvent of solution B is desalted water.

The alcohol is methanol; the conductivity of the desalted water is 2 μS/cm, and the pH is 6.7.

The preparation of solution A includes the following steps: (1) select alcohol at 40°C as the solvent, add hydrochloric acid and stir evenly; (2) add stearamide or stearyl glyceride or a mixture of the two; (3) add tristearyl Glycerides, mixed evenly;

The preparation of solution B comprises the following steps, (1) select desalted water as the solvent, add formaldehyde and stir evenly; (2) add polyvinyl alcohol; (3) add sodium polyacrylate or sodium alkylsulfonate or a mixture of the two, well mixed.

A method for washing silicon-aluminum-phosphorous molecular sieves using the washing cycle of the above-mentioned device, comprising the following steps,

1) Inject a dispersant into the beating kettle, and the quality of the dispersant is 0.8% of the mass of the silica-alumina molecular sieve to be washed; then inject desalted water of 60% of the volume of the beating kettle into the beating kettle as the initial washing liquid, stir, and start the centrifuge Pump, so that the washing liquid is evenly sprayed from the spray device above the receiving hopper through the pipeline;

2) The synthesized fresh Si-Al-P molecular sieve slurry enters the filter press for pressure filtration, and the Si-Al-P molecular sieve after pressure filtration falls into the receiving hopper. Transport to the beating tank to form a new mixed liquor;

3) After the fresh silicon aluminum phosphorus molecular sieve slurry is filtered by the filter press, the first valve is opened, the centrifugal pump is adjusted, and desalted water is continuously fed into the beating kettle at the same time, and a part of the new mixed solution in the beating kettle enters the press filter through the pipeline The press filter is carried out, the liquid out of the press filter is discharged out of the filter press, and the filter cake out of the press filter enters the hopper again; the other part of the new mixed liquid is wetted by the spray device to the silicon-aluminum molecular sieve in the hopper, and the wetting The finished silicon aluminum phosphorus molecular sieve is transported to the beating kettle again by the double screw conveyor; the volume ratio of the new mixed liquid entering the filter press and the new mixed liquid entering the spraying device is 20:1;

4) Repeat step 2) and step 3) for a total of 3 times. When the pH of the solution in the beating kettle is 7.6, close the second valve, stop feeding desalted water into the beating kettle, and at the same time, the double screw conveyor rotates in reverse to filter the press filter. The filter cake filtered by machine pressure is conveyed to the product tank.

5) Open the first valve and the second valve, pass desalted water into the beating tank, adjust the rotation of the double screw conveyor, and clean the entire device system through the circulation of desalinated water.

During the whole cycle of washing, the solid content of the silicon-aluminum-phosphorus molecular sieve in the mixed liquid in the beating kettle is about 21%.

The flow rate of desalted water fed into the beating kettle keeps the liquid level in the beating kettle between 60% and 65%; the diameter of the pipeline is 72mm.

The volume of the fresh silicon-aluminum-phosphorus molecular sieve slurry processed once by the filter press is 100% of the volume of the washing liquid in the beating kettle.

Embodiment two

A dispersant for washing silicon-aluminum-phosphorus molecular sieves, comprising solution A and solution B mixed at a volume ratio of 0.18:1;

Said solution A comprises solvent, 6% hydrochloric acid of solvent mass, 0.6% stearamide or stearyl glyceride or the mixture of both; 20% tristearin of solvent mass;

Said solution B comprises solvent, 0.02% formaldehyde of solvent mass, 6% polyvinyl alcohol of solvent mass, 4% sodium polyacrylate or sodium alkylsulfonate or a mixture of the two;

The solvent of solution A is alcohol; the solvent of solution B is desalted water.

The alcohol is ethanol; the conductivity of the desalted water is 4 μS/cm, and the pH is 6.0.

The preparation of solution A includes the following steps: (1) select alcohol at 50°C as the solvent, add hydrochloric acid and stir evenly; (2) add stearamide or stearyl glyceride or a mixture of the two; (3) add tristearyl Glycerides, mixed evenly;

The preparation of solution B comprises the following steps, (1) select desalted water as the solvent, add formaldehyde and stir evenly; (2) add polyvinyl alcohol; (3) add sodium polyacrylate or sodium alkylsulfonate or a mixture of the two, well mixed.

A method for washing silicon-aluminum-phosphorous molecular sieves using the washing cycle of the above-mentioned device, comprising the following steps,

1) Inject a dispersant into the beating kettle, and the quality of the dispersant is 1.5% of the mass of the silica-alumina molecular sieve to be washed; then inject desalted water with 55% of the volume of the beating kettle into the beating kettle as the initial washing liquid, stir, and start the centrifuge Pump, so that the washing liquid is evenly sprayed from the spray device above the receiving hopper through the pipeline;

2) The synthesized fresh Si-Al-P molecular sieve slurry enters the filter press for pressure filtration, and the Si-Al-P molecular sieve after pressure filtration falls into the receiving hopper. Transport to the beating tank to form a new mixed liquor;

3) After the fresh silicon aluminum phosphorus molecular sieve slurry is filtered by the filter press, the first valve is opened, the centrifugal pump is adjusted, and desalted water is continuously fed into the beating kettle at the same time, and a part of the new mixed solution in the beating kettle enters the press filter through the pipeline The press filter is carried out, the liquid out of the press filter is discharged out of the filter press, and the filter cake out of the press filter enters the hopper again; the other part of the new mixed liquid is wetted by the spray device to the silicon-aluminum molecular sieve in the hopper, and the wetting The finished silicon aluminum phosphorus molecular sieve is transported to the beating kettle again by the double screw conveyor; the volume ratio of the new mixed solution entering the filter press and the new mixed solution entering the spraying device is 25:1;

4) Repeat step 2) and step 3) for a total of 4 times. When the pH of the solution in the beating kettle is 7.8, close the second valve and stop feeding desalted water into the beating kettle. The press-filtered filter cake is conveyed to the product tank.

5) Open the first valve and the second valve, pass desalted water into the beating tank, adjust the rotation of the double screw conveyor, and clean the entire device system through the circulation of desalinated water.

During the whole cycle of washing, the solid content of the silicon aluminum phosphorus molecular sieve in the mixed liquid in the beating kettle is about 30%.

The flow of desalted water into the beating kettle keeps the liquid level in the beating kettle between 70%; the diameter of the pipeline is 72mm.

The volume of the synthesized fresh silicon-aluminum-phosphorus molecular sieve slurry treated once by the filter press is 140% of the volume of the washing liquid in the beating kettle.

Embodiment three

A dispersant for washing silicon-aluminum-phosphorus molecular sieves, comprising solution A and solution B mixed at a volume ratio of 0.28:1;

Described solution A comprises solvent, the hydrochloric acid of 8% of solvent quality, the stearyl amide or stearyl glyceride of 0.7% of solvent quality or the mixture of both; The glyceryl tristearate of 28% of solvent quality;

Said solution B comprises solvent, 0.03% formaldehyde of solvent mass, 13% polyvinyl alcohol of solvent mass, 7% sodium polyacrylate or sodium alkyl sulfonate or the mixture of both;

The solvent of solution A is alcohol; the solvent of solution B is desalted water.

The alcohol is methanol; the conductivity of the desalted water is 2 μS/cm, and the pH is 7.0.

The preparation of solution A includes the following steps: (1) select alcohol at 55°C as the solvent, add hydrochloric acid and stir evenly; (2) add stearamide or stearyl glyceride or a mixture of the two; (3) add tristearyl Glycerides, mixed evenly;

The preparation of solution B comprises the following steps, (1) select desalted water as the solvent, add formaldehyde and stir evenly; (2) add polyvinyl alcohol; (3) add sodium polyacrylate or sodium alkylsulfonate or a mixture of the two, well mixed.

A method for washing silicon-aluminum-phosphorous molecular sieves using the washing cycle of the above-mentioned device, comprising the following steps,

1) Inject a dispersant into the beating kettle, and the quality of the dispersant is 1.8% of the mass of the silica-alumina molecular sieve to be washed; then inject desalted water with 70% of the volume of the beating kettle into the beating kettle as the initial washing liquid, stir, and start the centrifuge Pump, so that the washing liquid is evenly sprayed from the spray device above the receiving hopper through the pipeline;

2) The synthesized fresh Si-Al-P molecular sieve slurry enters the filter press for pressure filtration, and the Si-Al-P molecular sieve after pressure filtration falls into the receiving hopper. Transport to the beating tank to form a new mixed liquor;

3) After the fresh silicon aluminum phosphorus molecular sieve slurry is filtered by the filter press, the first valve is opened, the centrifugal pump is adjusted, and desalted water is continuously fed into the beating kettle at the same time, and a part of the new mixed solution in the beating kettle enters the press filter through the pipeline The press filter is carried out, the liquid out of the press filter is discharged out of the filter press, and the filter cake out of the press filter enters the hopper again; the other part of the new mixed liquid is wetted by the spray device to the silicon-aluminum molecular sieve in the hopper, and the wetting The silicon-aluminum-phosphorus molecular sieve is transported to the beating kettle again by the double-screw conveyor; the volume ratio of the new mixed solution entering the filter press to the new mixed solution entering the spraying device is 32:1;

4) Repeat step 2) and step 3) for a total of 5 times. When the pH of the solution in the beating kettle is 8.0, close the second valve and stop feeding desalted water into the beating kettle. The press-filtered filter cake is conveyed to the product tank.

5) Open the first valve and the second valve, pass desalted water into the beating tank, adjust the rotation of the double screw conveyor, and clean the entire device system through the circulation of desalinated water.

During the whole cycle of washing, the solid content of the silicon aluminum phosphorus molecular sieve in the mixed liquid in the beating kettle is about 25%.

The flow rate of desalted water fed into the beating kettle keeps the liquid level in the beating kettle at 72%; the diameter of the pipeline is 72mm.

The volume of the synthesized fresh silicon-aluminum-phosphorus molecular sieve slurry treated once by the filter press is 90% of the volume of the washing liquid in the beating kettle.

The viscous substances of the washed catalysts in Examples 1 to 3 are removed, which greatly reduces the viscosity of the material, and no longer blocks pipelines or equipment. The unwashed catalyst cannot produce propylene, because the activity of the unwashed catalyst is almost 0, the prepared catalyst must be washed.

Comparative example 1 is a silicon aluminum phosphorus molecular sieve that is only washed with desalted water, and washed twice in total.

Comparative example 2 is a silicon aluminum phosphorus molecular sieve that is only washed with desalted water, and is washed 10 times in total.

The silicon-aluminum-phosphorous molecular sieves in Examples 1 to 3, and Comparative Examples 1 and 2 were used in the preparation of ethylene, propylene and butene at the same time, and the following data were obtained by using conventional experimental methods.

Experimental data:

Ethylene (optional) Propylene (optional) Butene (optional) Conversion rate Case number one 38.9% 40.2% 12.3% 99.78% case two 39.2% 40.0% 11.9% 99.56% case three 38.8% 41.2% 12.4% 99.49% Comparative example one 36.2% 38.5% 14.6% 97.35% Comparative example two 39.0% 41.9% 12.1% 99.61%

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the Within the scope of protection of the present invention.

Claims (10)

1. a kind of dispersant for being used to wash sial phosphorus molecular sieve, it is characterised in that：Including according to mass ratio (0.01-0.3)：1 The solution A and solution B of mixing；

The solution A include solvent, the 3-10% of solvent quality hydrochloric acid, the 0.3-0.8% of solvent quality stearmide or Stearic glyceride or the mixture of the two；The 14-32% of solvent quality glyceryl tristearate；

The solution B include solvent, the 0.01-0.03% of solvent quality formaldehyde, the 0-15% of solvent quality polyvinyl alcohol, The 0-8% of solvent quality Sodium Polyacrylate or sodium alkyl sulfonate or the mixture of the two；

The solvent of solution A is alcohol；The solvent of solution B is desalted water.

2. the dispersant according to claim 1 for being used to wash sial phosphorus molecular sieve, it is characterised in that：The alcohol is first Alcohol, ethanol, propane diols, glycerine, n-butanol, isobutanol, phenmethylol, ethylene glycol are one or two kinds of；The conductance of the desalted water It is 6.0~7.0 that rate, which is less than 5 μ S/cm, pH,.

3. the dispersant according to claim 1 or 2 for being used to wash sial phosphorus molecular sieve, it is characterised in that：The system of solution A Standby to comprise the following steps, (1) selects 30-60 DEG C of alcohol as solvent, and the 3-10% of solvent quality hydrochloric acid stirring is added in addition Uniformly；(2) stearmide or stearic glyceride or the two mixture of the addition equivalent to the 0.3-0.8% of solvent quality；(3) The glyceryl tristearate of the 14-32% equivalent to solvent quality is added, is well mixed；

The preparation of solution B comprises the following steps that (1), from desalted water as solvent, the formaldehyde that 0.01-0.03% is added in addition is stirred Mix uniform；(2) polyvinyl alcohol of the addition equivalent to the 0-15% of solvent quality；(3) addition is equivalent to the 0-8%'s of solvent quality Sodium Polyacrylate or sodium alkyl sulfonate or the mixture of the two, are well mixed.

4. a kind of device for circulating washing sial phosphorus molecular sieve, it is characterised in that：Including filter press, conveying worm and mashing Kettle；The filter press is with being beaten kettle by pipeline communication, and pipeline is provided with the first valve and centrifugal pump；The helical feed Machine is provided with recovering hopper, and the recovering hopper is located at below the outlet of filter press；Two outlets of the conveying worm connect respectively Connect products pot and mashing kettle；Spray equipment is provided with above the recovering hopper, pipe is passed through between the spray equipment and mashing kettle Road is connected, and pipeline is provided with the second valve and centrifugal pump.

5. the device of circulation washing sial phosphorus molecular sieve according to claim 4, it is characterised in that：Mashing bottom end Circulation house steward is connected with, the circulation house steward branches out two and is in charge of, connected respectively with filter press and spray equipment, and be in charge of On be respectively equipped with the first valve and the second valve；Centrifugal pump is provided with circulation house steward.

6. a kind of method that device wash cycle using as described in claim 4 or 5 washs sial phosphorus molecular sieve, its feature exists In：Comprise the following steps,

1) dispersant of the injection as described in any one of claims 1 to 3 into mashing kettle, and the quality of dispersant is silicon to be washed The 0.5-2% of aluminum molecular screen quality；Backward mashing kettle in injection mashing kettle volume 40~75% desalted water as initially washing Liquid is washed, is stirred, and opens centrifugal pump, cleaning solution is uniformly sprayed from the spray equipment of the top of recovering hopper through pipeline；

2) the fresh Si-Al molecular sieve slurries of synthesis enter press filtration in filter press, and the sial phosphorus molecular sieve after press filtration falls into rewinding Bucket, after cleaning solution wetting of the sial phosphorus molecular sieve through spray, is transported in mashing kettle by DWG and forms new mixed liquor；

3) after the complete fresh sial phosphorus molecular sieve slurries of filter press press filtration, the first valve is opened, centrifugal pump is adjusted, while to mashing The continuous new mixed liquor part being passed through in desalted water, mashing kettle enters filter press progress press filtration through pipeline in kettle, is press-filtered out Liquid discharges filter press, and the filter cake being press-filtered out is again introduced into recovering hopper；The new mixed liquor of another part is through spray equipment to rewinding Si-Al molecular sieve in bucket is soaked, and the sial phosphorus molecular sieve after wetting is transported to mashing kettle by DWG again It is interior；Volume ratio into the new mixed liquor of filter press and the new mixed liquor for entering spray equipment is (20-40)：1；

4) repeat step 2) and step 3) common 2-5 times, when the pH value of solution in mashing kettle is 6.6~8.2, then close the second valve Door, stops being passed through desalted water to mashing kettle, while DWG counter-rotating, the filter cake for being press-filtered out filter press is transported to In products pot.

7. the method that use device wash cycle according to claim 6 washs sial phosphorus molecular sieve, it is characterised in that：Also Including step 5), the first valve and the second valve are opened, desalted water is passed through into mashing kettle, regulation DWG rotates, Whole device system is cleaned by the circulation of desalted water.

8. the method that use device wash cycle according to claim 6 washs sial phosphorus molecular sieve, it is characterised in that： During whole circulation washing, in the mixed liquor in mashing kettle, the solid content of sial phosphorus molecular sieve is less than 34%.

9. the method that use device wash cycle according to claim 6 washs sial phosphorus molecular sieve, it is characterised in that：It is logical Enter to the desalination water-carrying capacity in mashing kettle makes the liquid level in mashing kettle be maintained between 50~75% all the time；The bore of pipeline is 50 ~90mm.

10. the method that use device wash cycle according to claim 6 washs sial phosphorus molecular sieve, it is characterised in that： The 50- that the volume of the fresh sial phosphorus molecular sieve slurries of the synthesis of filter press single treatment is accumulated for wash liquid in mashing kettle 180%.