CN216909202U - Solid catalysis multistage flash evaporation continuous esterification reaction device - Google Patents

Abstract

The utility model discloses a solid catalytic multistage flash continuous esterification reaction device, which comprises a feeding device, a reaction device and a treatment device, wherein the devices are mutually connected in series through pipelines, the feeding device comprises a feeding pump and a mixer, the feeding pump is connected with the mixer through a pipeline, the mixer is connected with a fixed bed through a pipeline, the reaction device comprises at least one fixed bed, the fixed bed sequentially comprises a flash evaporation zone and a solid catalyst packing zone from top to bottom, the top of the flash evaporation zone is communicated with a vacuum pump through a pipeline, an output pipeline is arranged at the lower part of the fixed bed, a preheater and a temperature transmitter are arranged on the pipeline between the mixer and the fixed bed, the utility model arranges the multistage fixed bed which is mutually connected in series, the flash evaporation zone and the catalyst packing zone in the fixed bed, a certain amount of reactants are subjected to flash evaporation and accelerated esterification reaction through the multistage fixed bed, and impurities in the reactants are reduced, the production efficiency of the esterification reaction is improved, and meanwhile, the treatment device is used for treating the product, so that the structure is simple and the operation is easy.

Description

Solid catalysis multistage flash evaporation continuous esterification reaction device

Technical Field

The utility model relates to the field of chemical equipment, in particular to a solid catalytic multistage flash evaporation continuous esterification reaction device.

Background

The esterification reaction is one of the most widely used methods in producing organic acid esters, but the esterification reaction of organic acid esters is very slow, the conversion rate is limited, most of the esterification reactions are carried out in a reaction kettle, the reaction kettle is provided with a jacket for heating and is provided with a stirring mixed material, water generated by the esterification reaction is removed by an entrainer, so that intermittent feeding and discharging are caused, the reaction mode has long reaction time, low production efficiency and complex operation, and automation is difficult to realize; in the existing continuous esterification reaction device, the reaction site and the reaction mode of the prior esterification reaction are still continued, so that the continuous esterification reaction device has the problems of complex structure, low continuous production efficiency and the like.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of complex structure and low continuous production efficiency of the conventional continuous esterification reaction device, the utility model provides a solid catalytic multistage flash evaporation continuous esterification reaction device, which has the following specific scheme:

a solid catalytic multistage flash evaporation continuous esterification reaction device comprises a feeding device, a reaction device and a treatment device, wherein the devices are mutually connected in series through pipelines, the feeding device comprises a feeding pump and a mixer, the feeding pump is connected with the mixer through a pipeline, the mixer is connected with a fixed bed through a pipeline, the reaction device comprises at least one fixed bed, the fixed bed sequentially comprises a flash evaporation zone and a solid catalyst packing zone from top to bottom, the top of the flash evaporation zone is communicated with a vacuum pump through a pipeline, and an output pipeline is arranged at the lower part of the fixed bed; a preheater and a temperature transmitter are arranged on the pipeline between the mixer and the fixed bed.

Furthermore, the reaction device comprises at least 2 fixed beds, and a material transfer pump is arranged on a pipeline between the lower part of the front side fixed bed and the inlet at the upper part of the rear side fixed bed.

Furthermore, a self-buffering tank and a flow transmitter are arranged on the pipeline of the feeding device.

Furthermore, a demister is arranged at the top of the flash evaporation area.

Further, the catalyst in the solid catalyst packing area is a molecular sieve.

Furthermore, the treatment device comprises a quenching heat exchanger, a cooler and a gas-liquid separation tank, the inlet of the last fixed bed is connected with the gas-liquid separation tank through a pipeline, the cooler is arranged on the pipeline, and the quenching heat exchanger is arranged on the lower outlet pipeline of the last fixed bed.

Further, the top of the fixed bed is communicated with a pressure transmitter.

Further, the mixer is a microchannel mixer or a static mixer.

According to the utility model, by arranging the multistage fixed beds which are mutually connected in series, the flash evaporation zone and the catalyst packing zone are arranged in the fixed bed, a certain amount of reactants are subjected to flash evaporation sequentially through the multistage fixed bed, the esterification reaction is accelerated, the impurities in the reactants are reduced, the production efficiency of the esterification reaction is improved, and meanwhile, the treatment device is used for carrying out a series of treatments on the products, so that the structure is simple, the environment is protected, and the operation is easy.

Drawings

FIG. 1 is a schematic structural diagram of a solid catalytic multistage flash continuous esterification reaction device.

In the figure: 1. a self-buffering tank; 2. a feed pump; 3. a mixer; 4. a fixed bed; 4-1, a flash zone; 4-2, a solid catalyst packing region; 5. a material transferring pump; 6. a preheater; 7. a demister; 8. a vacuum pump; 9. a quench heat exchanger; 10. a cooler; 11. a gas-liquid separation tank; 12. a flow transmitter; 13. a temperature transmitter; 14. a pressure transmitter.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The utility model discloses a solid catalytic multistage flash evaporation continuous esterification reaction device, which is shown in a figure I and mainly comprises a feeding device, a reaction device and a processing device, wherein the devices are mutually connected in series through pipelines, the feeding device comprises a feeding pump 2 and a mixer 3, the feeding pump 2 is connected with the mixer 3 through a pipeline, the mixer 3 can be a micro-channel mixer, a static mixer or a jet flow mixer, a self-buffer tank 1 and a flow transmitter 12 are arranged on the pipeline of the feeding device, the mixer 3 is communicated with the reaction device through a pipeline, the reaction device comprises 4 fixed beds 4 which are mutually connected in series, a first-stage fixed bed and a second-stage fixed bed … … are sequentially arranged from left to right in a analogizing way, the fixed bed 4 sequentially comprises a flash evaporation zone 4-1 and a solid catalyst packing zone 4-2 from top to bottom, the top of the flash evaporation zone 4-1 is communicated with a vacuum pump 8, and gas discharged by flash evaporation enters the vacuum pump 8, the vacuum pump 8 is used for controlling the vacuum degree in the flash evaporation area 4-1 in a frequency conversion mode, the top of the flash evaporation area 4-1 is also provided with a demister 7 for filtering liquid drops in gas, a catalyst in the solid catalyst packing area 4-2 is a molecular sieve which is acidic at a working temperature and can catalyze and complete esterification, a preheater 6 and a temperature transmitter 13 are arranged on a pipeline between the mixer 3 and the fixed bed 4, the preheater 6 is used for controlling the temperature of reactants, the temperature transmitter 13 is used for controlling the temperature of the flash evaporation area 4-1, an output pipeline is arranged at the lower part of the fixed bed 4, a material transfer pump 5 is arranged on a pipeline between the lower part of the front fixed bed 4 and an upper inlet of the adjacent rear fixed bed 4, the processing device comprises a quenching heat exchanger 9, a cooler 10 and a gas-liquid separation tank 11, the inlet of the last fixed bed 4 is connected with the gas-liquid separation tank 11 through a pipeline, the gas-liquid separation tank 11 is used for collecting condensed gas and discharging the non-condensed gas to the vacuum pump 8, the cooler 10 is arranged on a pipeline, the cooler 10 is used for condensing steam flashed out, the quenching heat exchanger 9 is arranged on a lower outlet pipeline of the last stage of fixed bed 4 and used for reducing quenching reaction, and the top of the fixed bed 4 is also communicated with the pressure transmitter 14.

The working process of the device takes acetic acid esterification as an example, the reaction temperature is 110 ℃, the flash evaporation pressure is-30 kPaG, and the reaction formula is as follows:

reactant 1 is excess acetic acid, reactant 2 is 100-300 parts of alcohol, acetic acid andalcohol respectively enters a feed pump 2 from a buffer tank 1, a flow transmitter 12 adjusts the components of acetic acid and alcohol conveyed into a mixer 3, a proper amount of acetic acid and alcohol are conveyed to the mixer 3, the temperature of the acetic acid and the alcohol is raised to the reaction temperature by a preheater at the inlet of a primary fixed bed 4, the acetic acid and the alcohol enter the fixed bed 4 from a flash evaporation zone 4-1, the acetic acid and the alcohol do not flash in the primary fixed bed and directly enter a solid catalyst packing zone 4-2 for reaction, substances such as acetic acid ester generated after the reaction, acetic acid and water which are not completely reacted are discharged by a material transfer pump 5 at the outlet of the primary fixed bed and raised to the temperature slightly higher than the reaction temperature by the preheater 6, the temperature of the flash evaporation zone 4-1 is controlled by the temperature transmitter 12 to reach the flash evaporation environment, the reactant and the product are flashed in the flash evaporation zone 4-1 of a secondary fixed bed, water and impurities generated during the reaction are flashed to become gas and are filtered by a demister 7 at the upper part, the rest reactant flows through the solid catalyst packing area 4-2 to react, the product and the reactant are transferred to the third-level fixed bed by the material transfer pump 5 at the outlet of the second-level fixed bed 4 and are flashed by the flashing area 4-1 of the third-level fixed bed, the water and the impurities generated in the reaction are turned into gas after being flashed and are filtered by the upper demister 7, the rest reactant flows through the solid catalyst packing area 4-2 to react, the reactant and the product are transferred to the fourth-level fixed bed by the material transfer pump 5 at the outlet of the third-level fixed bed 4 and are flashed by the flashing area 4-1 of the fourth-level fixed bed, the water and the impurities generated in the reaction are turned into gas after being flashed and are filtered by the upper demister 7, the rest reactant flows through the solid catalyst packing area 4-2 to react, and the reactant is subjected to catalytic reaction from the first-level fixed bed to the fourth-level fixed bed, the esterification reaction is completed completely, the finally generated acetic ester enters the next working section after being treated by a quenching heat exchanger 9 at the outlet of a four-stage fixed bed, gas filtered in a flash evaporation zone 4-1 through a demister 7 is communicated to a cooler through a pipeline and condensed to become non-condensable gas and acetic acid solution, the non-condensable gas and the acetic acid solution are separated through a gas-liquid separator, the non-condensable gas is subjected to tail gas removal treatment after passing through a vacuum pump, peculiar smell is removed and discharged, and the remaining acetic acid solution is subjected to condensation rectification treatment through a material transfer pump.

According to the utility model, a plurality of fixed beds which are connected in series are arranged, a flash evaporation zone and a catalyst packing zone are arranged in each fixed bed, a certain amount of reactants sequentially pass through the multistage fixed beds for esterification, impurities in the reactants are reduced through the flash evaporation and gas-liquid separation tanks, the catalyst in the fixed beds can accelerate the esterification, meanwhile, the multistage structural arrangement can improve the production efficiency of the esterification, and the treatment device can treat the products, so that the device has the advantages of simple structure, easiness in operation, energy conservation and environmental protection.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. The solid catalytic multistage flash evaporation continuous esterification reaction device is characterized by comprising a feeding device, a reaction device and a treatment device, wherein the devices are connected in series through pipelines, the feeding device comprises a feeding pump (2) and a mixer (3), the feeding pump (2) is connected with the mixer (3) through a pipeline, the mixer (3) is connected with a fixed bed (4) through a pipeline, the reaction device comprises at least one fixed bed (4), the fixed bed (4) sequentially comprises a flash evaporation zone (4-1) and a solid catalyst packing zone (4-2) from top to bottom, the top of the flash evaporation zone (4-1) is communicated with a vacuum pump (8) through a pipeline, and an output pipeline is arranged at the lower part of the fixed bed (4); a preheater (6) and a temperature transmitter (13) are arranged on the pipeline between the mixer and the fixed bed (4).

2. A solid catalytic multi-stage flash continuous esterification reaction device according to claim 1, wherein the reaction device comprises at least 2 fixed beds (4), and a material transfer pump (5) is arranged on the pipeline between the lower part of the front side fixed bed (4) and the inlet of the upper part of the rear side fixed bed (4).

3. The solid catalytic multi-stage flash continuous esterification reaction device according to claim 1, wherein the pipeline of the feeding device is provided with a self-buffering tank (1) and a flow transmitter (12).

4. A solid catalytic multi-stage flash continuous esterification reaction device according to claim 1, wherein a demister (7) is arranged at the top of the flash zone (4-1).

5. A solid catalytic multi-stage flash continuous esterification reaction device according to claim 1, wherein the catalyst in the solid catalyst packing region (4-2) is molecular sieve.

6. The solid catalytic multi-stage flash evaporation continuous esterification reaction device according to claim 1, wherein the treatment device comprises a quenching heat exchanger (9), a cooler (10) and a gas-liquid separation tank (11), the inlet of the last stage fixed bed (4) is connected with the gas-liquid separation tank (11) through a pipeline, the cooler (10) is installed on the pipeline, and the quenching heat exchanger (9) is arranged on the lower outlet pipeline of the last stage fixed bed (4).

7. A solid catalytic multi-stage flash continuous esterification reaction unit according to claim 1, wherein the top of the fixed bed (4) is connected to a pressure transmitter (14).

8. A solid catalytic multi-stage flash continuous esterification reaction device according to claim 1, wherein the mixer (3) is a micro-channel mixer or a static mixer.

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