CN113996231A - Novel batching kettle for preparing urea fatty alcohol mixed solution and using method thereof - Google Patents
Novel batching kettle for preparing urea fatty alcohol mixed solution and using method thereof Download PDFInfo
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- CN113996231A CN113996231A CN202111652075.4A CN202111652075A CN113996231A CN 113996231 A CN113996231 A CN 113996231A CN 202111652075 A CN202111652075 A CN 202111652075A CN 113996231 A CN113996231 A CN 113996231A
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- 239000004202 carbamide Substances 0.000 title claims abstract 18
- -1 urea fatty alcohol Chemical class 0.000 title claims abstract 10
- 238000000034 method Methods 0.000 title claims abstract 6
- 239000011259 mixed solution Substances 0.000 title claims 6
- 238000010008 shearing Methods 0.000 claims abstract 35
- 150000002191 fatty alcohols Chemical class 0.000 claims abstract 12
- 239000007788 liquid Substances 0.000 claims abstract 11
- 239000003054 catalyst Substances 0.000 claims abstract 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract 8
- 239000000463 material Substances 0.000 claims abstract 3
- 238000006243 chemical reaction Methods 0.000 claims abstract 2
- 238000003780 insertion Methods 0.000 claims abstract 2
- 230000037431 insertion Effects 0.000 claims abstract 2
- 238000003756 stirring Methods 0.000 claims 6
- 238000007789 sealing Methods 0.000 claims 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims 3
- 238000010438 heat treatment Methods 0.000 claims 3
- 229910044991 metal oxide Inorganic materials 0.000 claims 1
- 150000004706 metal oxides Chemical group 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract 2
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
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Abstract
The invention provides a novel batching kettle for preparing urea fatty alcohol mixed liquid and a using method thereof, relating to the field of batching kettles, and the novel batching kettle for preparing urea fatty alcohol mixed liquid comprises a mixing tank, a mixing stirrer, a condenser, a shearing cylinder and a shearing stirrer; the mixing tank consists of an upper end enclosure of the mixing tank, a barrel of the mixing tank and a lower end enclosure of the mixing tank; and the upper end socket of the mixing tank is provided with a shearing cylinder insertion opening, a pressure gauge interface, an aliphatic alcohol inlet, a gas phase channel and a catalyst feeding opening. The condenser is arranged on the gas channel of the mixing tank, so that the vaporized fatty alcohol due to partial pressure supply can be condensed into liquid to directly flow back to the mixing tank, the waste of the fatty alcohol is effectively reduced, the environmental pollution is avoided, and the purposes of saving and environmental protection are achieved; the mixed material of the fatty alcohol, the urea and the catalyst is prepared at the temperature of 25-60 ℃, so that the reaction of the fatty alcohol and the urea in the batching process can be effectively reduced, and the purpose of environmental protection is realized.
Description
Technical Field
The invention relates to the technical field of a batching kettle, in particular to a novel batching kettle for preparing urea fatty alcohol mixed liquid and a using method thereof.
Background
The technology for preparing corresponding organic carbonates such as dimethyl carbonate, diethyl carbonate, ethylene carbonate, glycerol carbonate and the like from urea and fatty alcohols such as methanol, ethanol, ethylene glycol, glycerol and the like has the characteristics of easily available raw materials, low cost, safe and environment-friendly process and the like, is increasingly emphasized by the industry, and partially realizes the application demonstration of industrialization.
The blending means that urea, fatty alcohol and metal oxide catalyst are put into a blending kettle according to a certain proportion, the urea is dissolved in the fatty alcohol at a certain temperature to form a fatty alcohol solution of the urea, and the fatty alcohol solution of the urea and the metal oxide catalyst need to be uniformly mixed. In the process, because urea particles are large and the solubility in fatty alcohol is relatively low, the time required by using a common stirring kettle for proportioning is long, continuous operation is not easy to realize, the proportioning efficiency is low, and the feeding for the next reaction process is greatly influenced.
Chinese patent CN111925351A discloses that a batching kettle formed by connecting 1-3 stirring kettles in series is used for preparing mixed liquid of urea and propylene (or) glycol, and the use of multiple kettles not only increases the equipment investment, but also increases the occupied area of the device; chinese patent CN105017206B invented a horizontal continuous mixer, polyol, urea and catalyst are respectively and continuously fed into the mixer from the front part of the horizontal mixer, and flow out from the discharge port at the rear part of the mixer under the action of mixer stirring, mixer upper baffle and mixer lower baffle, and are fed into a reactor, although the process realizes continuity and improves efficiency, it does not consider that polyol is vaporized and escaped due to partial pressure supply in the process of heating and dissolving urea to cause raw material loss; the Chinese patent CN104059047B invented a tower type raw material mixer with external forced circulation for dissolving and mixing urea, polyol and metal oxide catalyst, and the continuity degree is higher, but the characteristic that the dissolution time is long for large urea particles is not overcome.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a novel batching kettle for preparing urea fatty alcohol mixed liquor and a using method thereof, and solves the problems of low batching efficiency and waste of partial raw materials in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the novel batching kettle for preparing the urea fatty alcohol mixed solution comprises a mixing tank, a mixing stirrer, a condenser, a shearing cylinder and a shearing stirrer; the mixing tank consists of an upper end enclosure of the mixing tank, a barrel of the mixing tank and a lower end enclosure of the mixing tank; the upper end socket of the mixing tank is provided with a shearing cylinder insertion opening, a pressure gauge interface, an aliphatic alcohol inlet, a gas phase channel and a catalyst feeding opening; a discharge port of the mixing tank is arranged on the lower end enclosure of the mixing tank; the mixing tank comprises a mixing tank barrel, a mixing tank liquid level meter, a mixing tank temperature meter and a mixing tank liquid level meter, wherein the mixing tank barrel is provided with a mixing tank liquid level meter upper connector, a mixing tank liquid level meter lower connector and a mixing tank temperature meter connector; a mixing tank jacket is arranged outside the mixing tank cylinder body and the mixing tank lower end enclosure; the mixing tank jacket is provided with a heating medium outlet and a heating medium inlet; the mixing stirrer comprises a mixing stirring motor, a mixing stirring shaft and a mixing stirring paddle, wherein the mixing stirring motor is fixedly arranged at the upper end of an upper end socket of the mixing tank, one end of the mixing stirring shaft is connected with an output shaft of the mixing stirring motor, the other end of the mixing stirring shaft is rotatably arranged at the bottom of the mixing tank, and the mixing stirring paddle is arranged on the mixing stirring shaft; the condenser is arranged on the gas phase channel, the top end of the condenser is provided with a non-condensed steam outlet, the side surface of the condenser is provided with a condensed medium inlet and a condensed medium outlet, the shearing cylinder consists of a shearing cylinder upper cover, a shearing cylinder barrel and a shearing cylinder lower end socket, the shearing cylinder upper cover is provided with a urea inlet, and the shearing cylinder barrel and the shearing cylinder lower end socket are both provided with micropores; the shearing cylinder is inserted into the mixing tank through the shearing cylinder insertion opening; the shearing stirrer is composed of a shearing motor, a shearing shaft and a shearing knife, the shearing motor is fixed at the upper end of an upper cover of the shearing cylinder, one end of the shearing shaft is connected with an output shaft of the shearing motor, the other end of the shearing shaft extends into the bottom of the shearing cylinder, and the shearing knife is installed on the shearing shaft.
Preferably, the anti-vertical-sinking baffle is arranged right below the catalyst feeding port and welded on the mixing tank barrel, an included angle alpha between the anti-vertical-sinking baffle and the mixing tank barrel is 90-95 degrees, the length of the anti-vertical-sinking baffle is 1/5-1/3 of the diameter of the mixing tank barrel, the width of the anti-vertical-sinking baffle is 1-3 times of the diameter of the catalyst feeding port, and the vertical distance between the cross section of the tail end of the anti-vertical-sinking baffle and the lower end socket of the mixing tank is 1/2-2/3 of the height of the mixing tank barrel.
Preferably, the diameter of the micropores on the shearing cylinder body is 0.5-1 mm, and the aperture ratio is 10-70% of that of the shearing cylinder body; the diameter of a micropore on the lower end socket of the shearing cylinder is 0.5-1 mm, and the aperture ratio is 10-70% of that of the lower end socket of the shearing cylinder; the diameter of the shearing barrel body is 1/3-1/7 of the diameter of the mixing tank body, and the distance between the lower end socket of the shearing barrel inserted into the mixing tank and the joint of the lower end socket of the mixing tank and the mixing tank body is 0 to half of the height of the liquid level in the mixing tank.
Preferably, the shearing motor is a high-speed rotating motor, and the rotating speed is 200-7500 r/min.
The use method of the novel dosing kettle for preparing the urea fatty alcohol mixed solution comprises the following steps:
s1, introducing condensed water into the condenser, introducing fatty alcohol into the mixing tank, starting the mixing stirrer and the shearing stirrer when the liquid level of the fatty alcohol in the mixing tank reaches half of the height of the liquid level meter, and introducing a heating medium into a jacket of the mixing tank to maintain the temperature in the mixing tank at 25-60 ℃;
s2, when the temperature in the mixing tank reaches 25-60 ℃, continuously adding fatty alcohol and a catalyst into the mixing tank, simultaneously continuously adding urea into the shearing cylinder, and maintaining the temperature of materials in the mixing tank at 25-60 ℃ and the pressure at normal pressure; the temperature of the materials in the mixing tank is maintained at 25-60 ℃, so that the urea is favorably dissolved in the fatty alcohol, and the ammonia gas released by the reaction of the urea and the fatty alcohol due to overhigh temperature can be avoided, and the environment pollution is avoided.
And S3, when the liquid level of the mixing tank exceeds 1/2 of the measuring range of the liquid level meter and is less than 2/3 of the measuring range of the liquid level meter, continuously discharging the mixed material of the fatty alcohol solution of the urea and the catalyst from a discharge port of the mixing tank, and sending the mixed material to a subsequent reaction process.
Preferably, the proportion of the fatty alcohol, the catalyst and the urea added into the mixing tank is as follows: the molar ratio of the fatty alcohol to the urea is (1-5): 1; the mass of the added catalyst is 0.5-5% of the mass of the added urea.
Preferably, the fatty alcohol is methanol or ethanol or ethylene glycol or glycerol; the catalyst is a metal oxide powder catalyst.
(III) advantageous effects
The invention provides a novel batching kettle for preparing urea fatty alcohol mixed liquid and a using method thereof. The method has the following beneficial effects:
1. the mixing tank is provided with the mixing stirrer, so that the fatty alcohol, the catalyst and the urea can be uniformly mixed, and the urea can be dissolved in the fatty alcohol conveniently; the micropores on the shearing cylinder body and the micropores on the lower end socket of the shearing cylinder are convenient for the intercommunication of the materials in the mixing tank and the materials in the shearing cylinder; the urea that the shearer can add into the shearing cylinder is sheared into the granule that the particle size is littleer, the urea granule that is sheared into the granule that the particle size is littleer in the shearing cylinder flows into the blending tank through the micropore of shearing a barrel body and shearing a section of thick bamboo low head, it dissolves in fatty alcohol more easily, high efficiency, urea, fatty alcohol and catalyst can be added in proportion constantly during the batching, and can continuously extract the miscellany, efficiency is higher, and device overall structure is simple, the equipment investment is little, the occupation of land space is little.
2. The condenser is arranged on the gas channel of the mixing tank, and the fatty alcohol vaporized by providing partial pressure can be condensed into liquid to directly flow back to the mixing tank, so that the waste of the fatty alcohol is effectively reduced, the environmental pollution is avoided, and the purposes of saving and environmental protection are achieved; the mixed material of the fatty alcohol, the urea and the catalyst is prepared at the temperature of 25-60 ℃, so that the reaction of the fatty alcohol and the urea in the batching process can be effectively reduced, and the purpose of environmental protection is realized.
Drawings
FIG. 1 is a schematic diagram of the shear-mix batch still of the present invention;
FIG. 2 is a top view of the anti-sag baffle of the present invention;
FIG. 3 is a front view of the anti-sink baffle of the present invention;
FIG. 4 is a top view of a shear cylinder head of the present invention;
FIG. 5 is a schematic representation of a fatty alcohol solution of formulated urea of the present invention mixed with a metal oxide powder catalyst.
Wherein, 1, mixing tank; 2. a mixing agitator; 3. a condenser; 4. a shearing cylinder; 5. a shear mixer; 6. a liquid level meter; 7. a pressure gauge; 8. a thermometer; 101. sealing the upper end of the mixing tank; 102. a cutting cylinder insertion opening; 103. a pressure gauge interface; 104. a fatty alcohol inlet; 105. a gas phase channel; 106. a catalyst addition port; 107. a mixing tank barrel; 108. a lower end enclosure of the mixing tank; 109. a discharge port of the mixing tank; 110. an upper interface of a liquid level meter of the mixing tank; 111. a lower interface of a liquid level meter of the mixing tank; 112. a straight sinking prevention baffle; 113. a mixing tank thermometer interface; 114. a mixing tank jacket; 115. a heating medium outlet; 116. a heating medium inlet; 201. a mixing and stirring motor; 202. a mixing stirring shaft; 203. mixing and stirring paddles; 301. an outlet which is not condensed; 302. a condensing medium inlet; 303. a condensing medium outlet; 401. the upper cover of the shearing cylinder; 402. a urea inlet; 403. shearing the cylinder body; 404. micropores; 405. a lower end enclosure of the shearing cylinder; 501. a shear motor; 502. a shear shaft; 503. and (4) a shearing knife.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1 to 5, the embodiment of the present invention provides a novel blending kettle for preparing a urea fatty alcohol mixed solution, including a mixing tank 1, a mixing agitator 2, a condenser 3, a shearing cylinder 4, and a shearing agitator 5; the mixing tank 1 consists of a mixing tank upper end enclosure 101, a mixing tank cylinder 107 and a mixing tank lower end enclosure 108; the mixing tank upper end socket 101 is provided with a shear cylinder insertion opening 102, a pressure gauge interface 103, an aliphatic alcohol inlet 104, a gas phase channel 105 and a catalyst feeding opening 106; a mixing tank discharge opening 109 is arranged on the mixing tank lower end enclosure 108; the mixing tank barrel 107 is provided with a mixing tank liquid level meter upper connector 110, a mixing tank liquid level meter lower connector 111 and a mixing tank thermometer connector 113, and a straight sinking prevention baffle plate 112 is arranged inside the mixing tank barrel 107; a mixing tank jacket 114 is arranged outside the mixing tank cylinder 107 and the mixing tank lower end enclosure 108; the mixing tank jacket 114 is provided with a heating medium outlet 115 and a heating medium inlet 116.
Mixing agitator 2 is including mixing agitator motor 201, mixing (mixing) shaft 202 and mixing stirring rake 203, mixing agitator motor 201 fixed mounting is in the upper end of blending tank upper cover 101, the one end of mixing (mixing) shaft 202 and the output shaft who mixes agitator motor 201, the other end of mixing (mixing) shaft 202 rotates the bottom of installing at blending tank 1, mixing stirring rake 203 is installed on mixing (mixing) shaft 202, mixing agitator 2 is favorable to the material misce bene in the blending tank 1, dissolve fully.
The condenser 3 is arranged on the gas phase channel 105, the top end of the condenser 3 is provided with a non-condensed steam outlet 301, the side surface of the condenser 3 is provided with a condensing medium inlet 302 and a condensing medium outlet 303, the condenser 3 can condense the fatty alcohol vaporized by providing partial pressure in the mixing tank 1 and directly flow back to the mixing tank 1, and raw material loss caused by escape of the fatty alcohol in a gas form is avoided.
The shearing cylinder 4 consists of a shearing cylinder upper cover 401, a shearing cylinder body 403 and a shearing cylinder lower end enclosure 405, wherein the shearing cylinder upper cover 401 is provided with a urea inlet 402, and the shearing cylinder body 403 and the shearing cylinder lower end enclosure 405 are both provided with micropores 404; the cutting cylinder 4 is inserted into the mixing tank 1 through the cutting cylinder insertion port 102; the shearing motor 501 is a high-speed rotating motor, the rotating speed is 200 rpm, the micropores 404 on the shearing cylinder body 403 can prevent large-particle urea added into the shearing cylinder 4 from flowing into the mixing tank 1 on one hand, and on the other hand, fatty alcohol in the mixing tank 1 can enter the shearing cylinder 4 to be mixed with urea added into the shearing cylinder 4, so that urea can be sheared favorably, and urea particles sheared into small particle sizes in the shearing cylinder 4 or urea dissolved in the fatty alcohol can be diffused into the mixing tank 1 due to concentration difference.
Shearing agitator 5 comprises shearing motor 501, shearing axle 502 and shearing sword 503, and shearing motor 501 is fixed in shearing section of thick bamboo upper cover 401 upper end, and one end of shearing axle 502 links to each other with shearing motor 501 output shaft, and another stretches into the bottom of shearing section of thick bamboo 4, and shearing sword 503 is installed on shearing axle 502, and shearing agitator 5 is favorable to shearing the urea in the shearing section of thick bamboo 4 into the granule that the particle size is more tiny.
The straight sedimentation preventing baffle 112 is arranged right below the catalyst feeding port 106 and welded on the mixing tank cylinder 107, the included angle alpha between the straight sedimentation preventing baffle 112 and the mixing tank cylinder 107 is 90 degrees, the length of the straight sedimentation preventing baffle is 1/5 of the diameter of the mixing tank cylinder 107, the width of the straight sedimentation preventing baffle is 1 time of the diameter of the catalyst feeding port 106, the vertical distance between the cross section of the tail end of the straight sedimentation preventing baffle and the mixing tank lower end enclosure 108 is 1/2 of the height of the mixing tank cylinder 107, and the straight sedimentation preventing baffle 112 can prevent the fed catalyst from directly sinking to the bottom to block a discharge port due to the action of gravity; the included angle alpha between the straight sinking prevention baffle 112 and the mixing tank barrel 107 is 90-95 degrees, which is beneficial to the falling of the catalyst falling on the baffle; the vertical distance between the transverse section of the tail end of the straight-sinking prevention baffle 112 and the lower end enclosure 108 of the stirring kettle is 1/2-2/3 of the height of the mixing tank cylinder 107, so that the straight-sinking prevention baffle 112 is effectively ensured to be below the liquid level in the normal batching process, and the dispersion of the catalyst in the mixing tank cylinder 107 is facilitated.
The diameter of the micropores 404 on the shearing cylinder body 403 is 0.5mm, and the aperture ratio is 10% of that of the shearing cylinder body 403; the diameter of the micropore 404 on the shearing cylinder lower end socket 405 is 0.5mm, and the aperture ratio is 10% of that of the shearing cylinder lower end socket 405; the diameter of the shearing cylinder body 403 is 1/3 of the diameter of the mixing tank body 107, the distance from the shearing cylinder lower end socket 405 inserted into the mixing tank 1 to the joint of the mixing tank lower end socket 108 and the mixing tank body 107 is 0, and micropores 404 with the diameters of 0.5-1 mm are uniformly formed in the shearing cylinder body 403 and the shearing cylinder end socket 405, so that urea particles can be retained in the shearing cylinder 4.
The use method of the novel dosing kettle for preparing the urea fatty alcohol mixed solution comprises the following steps:
s1, introducing condensed water into the condenser 3, introducing methanol into the mixing tank 1, starting the mixing stirrer 2 and the shearing stirrer 5 when the liquid level of the methanol in the mixing tank 1 reaches half of the height of the liquid level meter 6, and introducing a heating medium into the mixing tank jacket 114 to maintain the temperature in the mixing tank 1 at 25 ℃;
and S2, when the temperature in the mixing tank 1 reaches 25 ℃, continuously adding methanol and the metal oxide powder catalyst into the mixing tank 1 according to the molar ratio of the methanol to the urea being 5:1 and the mass ratio of the metal oxide powder catalyst to the urea being 0.005:1, adding the urea into the shearing cylinder 4, and maintaining the temperature of the materials in the mixing tank 1 at 25 ℃ and the pressure at normal pressure.
S3, when the liquid level of the mixing tank 1 exceeds 1/2 of the range of the liquid level meter 6 and is less than 2/3 of the range of the liquid level meter 6, continuously discharging the mixed material of the methanol solution of the urea and the catalyst from a discharge port 109 of the mixing tank to a subsequent reaction process, and maintaining the liquid level of the mixing tank 1 between 1/2 and 2/3 of the range, as shown in figure 5, the liquid level meter 6 is connected with an upper connector 110 of the mixing tank liquid level meter and a lower connector 111 of the mixing tank liquid level meter, and the pressure meter 7 and the thermometer 8 are respectively connected with a pressure meter connector 103 and a temperature meter connector 113 of the mixing tank.
Example 2:
the novel dosing kettle for preparing urea fatty alcohol mixed liquor is characterized in that an included angle alpha between a straight-sinking prevention baffle 112 and a mixing tank cylinder 107 is 95 degrees, the length of the included angle alpha is 1/3 degrees of the diameter of the mixing tank cylinder 107, the width of the included angle alpha is 3 times of the diameter of a catalyst adding port 106, the vertical distance between a transverse cutting surface of the tail end of the novel dosing kettle and a lower end socket 108 of the mixing tank is 1/3 degrees of the height of the mixing tank cylinder 107, a shearing cylinder 403 is provided with micropores 404 with the diameter of 1mm, and the aperture ratio of the shearing cylinder 403 is 70 percent; a micro-hole 404 with the diameter of 1mm is also arranged on the lower end enclosure 405 of the shearing cylinder, and the aperture ratio is 70% of that of the cylinder body 403 of the shearing cylinder; the diameter of the shearing cylinder 4 is 1/7 of the diameter of the mixing tank 1, and the distance from the lower end enclosure 405 of the shearing cylinder inserted into the mixing tank 1 to the joint of the lower end enclosure 108 of the mixing tank and the cylinder body 107 of the mixing tank is 1 half of the height of the liquid level of the mixing tank 1; the shear motor 501 was run at 7500 rpm as in example 1.
When the liquid level of ethylene glycol in a mixing tank 1 reaches half of the height of a liquid level meter 6, starting a mixing stirrer 2 and a shearing stirrer 5, and introducing a heating medium into a mixing tank jacket 114 to maintain the temperature in the mixing tank 1 at 60 ℃; then, continuously adding the ethylene glycol and the metal oxide powder catalyst into the mixing tank 1 and adding the urea into the shearing cylinder 4 according to the molar ratio of the ethylene glycol to the urea being 1:1 and the mass ratio of the metal oxide powder catalyst to the urea being 0.05:1, and maintaining the temperature of the materials in the mixing tank 1 at 60 ℃; when the liquid level of the mixing tank 1 exceeds 1/2 of the range of the liquid level meter 6 and is less than 2/3 of the range of the liquid level meter 6, the obtained mixed material of the glycol solution of urea and the metal oxide powder catalyst is continuously discharged from the discharge port 109 of the mixing tank and is sent to the subsequent reaction process, and the liquid level of the mixing tank 1 is maintained between 1/2 and 2/3 of the range. Otherwise as described in example 1.
Example 3:
a novel dosing kettle for preparing urea fatty alcohol mixed liquid, as described in embodiment 1, the included angle α between the straight-sinking prevention baffle 112 and the mixing tank cylinder 107 is 92 °, the length of the included angle α is 1/4 of the diameter of the mixing tank cylinder 107, the width of the included angle α is 2 times of the diameter of the catalyst feeding port 106, the vertical distance between the cross section of the tail end of the mixing tank and the lower end enclosure 108 of the mixing tank is 3/5 of the height of the mixing tank cylinder 107, the shearing cylinder 403 is provided with micropores 404 with the diameter of 0.75mm, and the aperture ratio is 40% of that of the shearing cylinder 403; a micro-hole 404 with the diameter of 1mm is also arranged on the lower end enclosure 405 of the shearing cylinder, and the aperture ratio is 35% of that of the cylinder body 403 of the shearing cylinder; the diameter of the shearing cylinder 4 is 1/5 of the diameter of the mixing tank 1, and the distance from the lower end enclosure 405 of the shearing cylinder inserted into the mixing tank 1 to the joint of the lower end enclosure 108 of the mixing tank and the cylinder body 107 of the mixing tank is 1 half of the liquid level height of the mixing tank 1; the shear motor 501 was run at 3500 rpm as in example 1.
When the liquid level of ethanol in the mixing tank 1 reaches half of the height of a liquid level meter 6, starting a mixing stirrer 2 and a shearing stirrer 5, and introducing a heating medium into a mixing tank jacket 114 to maintain the temperature in the mixing tank 1 at 35 ℃; then, continuously adding ethanol and the metal oxide powder catalyst into the mixing tank 1 and adding urea into the shearing cylinder 4 according to the molar ratio of the ethanol to the urea of 2.5:1 and the mass ratio of the metal oxide powder catalyst to the urea of 0.01:1, and maintaining the temperature of materials in the mixing tank 1 at 35 ℃; when the level of the mixing tank 1 exceeds 1/2 on the range of the level meter 6 and is less than 2/3 on the range of the level meter 6, the resulting mixture of the ethanol solution of urea and the metal oxide powder catalyst is continuously removed from the mixing tank discharge opening 109 and sent to the subsequent reaction step, and the level of the mixing tank 1 is maintained between 1/2 and 2/3 on its range, as in example 1.
Example 4:
the novel dosing kettle for preparing urea fatty alcohol mixed solution is the same as that described in example 3.
When the liquid level of glycerol in a mixing tank 1 reaches half of the height of a liquid level meter 6, starting a mixing stirrer 2 and a shearing stirrer 5, and introducing a heating medium into a mixing tank jacket 114 to maintain the temperature in the mixing tank at 60 ℃; then, continuously adding the glycerol and the metal oxide powder catalyst into the mixing tank 1 and adding the urea into the shearing cylinder 4 according to the molar ratio of the glycerol to the urea being 1.5:1 and the mass ratio of the metal oxide powder catalyst to the urea being 0.03:1, and maintaining the temperature of materials in the mixing tank 1 at 60 ℃; when the liquid level of the mixing tank 1 exceeds 1/2 of the range of the liquid level meter 6 and is less than 2/3 of the range of the liquid level meter 6, the obtained mixed material of the urea glycerol solution and the metal oxide powder catalyst is continuously removed from the discharge port 109 of the mixing tank and sent to the subsequent reaction process, and the liquid level of the mixing tank 1 is maintained between 1/2 and 2/3 of the range. Otherwise as described in example 1.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
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| CN115025648A (en) * | 2022-08-11 | 2022-09-09 | 上海旭东海普南通药业有限公司 | Production method for dissolving and purifying medical urea |
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| CN111925351A (en) * | 2020-08-28 | 2020-11-13 | 华东理工大学 | Method for continuously dissolving urea and propylene glycol (or ethylene glycol) |
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| CN115025648A (en) * | 2022-08-11 | 2022-09-09 | 上海旭东海普南通药业有限公司 | Production method for dissolving and purifying medical urea |
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