Ethyl acetate pressurized esterification production line

Abstract

The utility model discloses an ethyl acetate pressurized esterification production line, which comprises an esterification unit, and the input end of the esterification unit is communicated with an ingredient input pipe; the input end of the esterification separation unit is communicated with the output end of the esterification unit, and the esterification separation unit is communicated with a pressure pump; the input end of the crude grease treatment unit is communicated with the output end of the esterification unit, and the crude grease treatment unit is communicated with a washing pump. Raw materials for preparing ethyl acetate are input into the esterification unit through the ingredient input pipe, ethyl acetate is generated after esterification reaction, and reactants continue to be separated through the esterification separation unit, so that the ethyl acetate is separated from residual alcohol, low-boiling-point alcohol and air are discharged together, the purity of the ethyl acetate is improved, and the production cost is reduced. In the separation process, the pressure pump can accelerate the separation speed of ethyl acetate, and finally, the ethyl acetate is subjected to water washing treatment and the like through the crude fat treatment unit, so that crude fat is obtained and stored in the crude fat intermediate tank, and subsequent rectification operation is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of ethyl acetate production technology, and in particular to an ethyl acetate pressurized esterification production line. Background Technology

[0002] Ethyl acetate, also known as ethyl acetate, is a colorless, transparent liquid with a pungent odor in its pure form. It is a widely used fine chemical product with excellent solubility and rapid drying properties. It is a very important organic chemical raw material and an excellent industrial solvent, widely used in the production of cellulose acetate, ethyl cellulose, chlorinated rubber, ethylene resin, cellulose acetate resin, synthetic rubber, coatings, and paints. Existing technology, patent number CN112409172B, discloses a method and system for producing ethyl acetate. In this method, the top of an esterification column is connected to the bottom of a distillation column via a first reboiler. The first reboiler is connected to a first phase separator via a third reboiler. The first phase separator is also connected to the top and middle of the esterification column. The distillation column's condenser heat exchanger is connected to the top of the distillation column, and the second phase separator is connected to the middle of the distillation column. After esterification, the product is directly subjected to distillation, resulting in a product with low purity. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems mentioned above, and provides an ethyl acetate pressurized esterification production line, which can increase the purity of crude ester by esterification separation and crude ester treatment after the esterification unit reaction, so as to facilitate subsequent distillation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An ethyl acetate pressurized esterification production line includes an esterification unit with a feed input pipe connected to its input end; an esterification separation unit with its input end connected to the output end of the esterification unit, and a pressurization pump connected to the esterification separation unit; and a crude ester treatment unit with its input end connected to the output end of the esterification unit, and a water washing pump connected to the crude ester treatment unit.

[0006] As an improvement to the above technical solution, the esterification unit is provided in two groups, and the two groups of esterification units are arranged in parallel.

[0007] As an improvement to the above technical solution, the esterification unit includes an esterification reboiler, an esterification kettle, and an esterification tower. The feed input pipe is connected to the esterification reboiler, the output end of the esterification reboiler is connected to the input end of the esterification kettle, and the output end of the esterification kettle is connected to the input end at the bottom of the esterification tower.

[0008] As an improvement to the above technical solution, the esterification separation unit includes an esterification condenser, an esterification separator, and a crude grease heat exchanger. The input end of the esterification condenser is connected to the output end of the top of the esterification tower, the input end of the esterification separator is connected to the output end of the esterification condenser, the crude grease heat exchanger is connected to the output end of the esterification separator, and the pressure pump is connected to the crude grease heat exchanger.

[0009] As an improvement to the above technical solution, the crude grease heat exchanger is provided with a reflux pipe connected to the esterification tower, and a water reflux pump is connected to the reflux pipe.

[0010] As an improvement to the above technical solution, the crude grease treatment unit includes a crude grease cooler, an esterification water washing mixer, a crude grease separator, and a crude grease intermediate tank. The input end of the crude grease cooler is connected to the output end of the crude grease heat exchanger, the input end of the esterification water washing mixer is connected to the output end of the crude grease cooler, the input end of the crude grease separator is connected to the output end of the esterification water washing mixer, the output end of the crude grease separator is connected to the crude grease intermediate tank, and the water washing pump is connected to the esterification water washing mixer.

[0011] As an improvement to the above technical solution, a batching unit is also included. The batching unit includes a batching preheating mixer, which is connected to an alcohol input pipe and an acetic acid input pipe. The output end of the batching preheating mixer is connected to a batching high-level tank, and the output end of the batching high-level tank is connected to an esterification reboiler.

[0012] As an improvement to the above technical solution, the batching unit also includes a hot water tank, which is connected to the batching preheating mixer through a circulating water inlet pipe and a circulating water outlet pipe.

[0013] As an improvement to the above technical solution, the esterification reboiler is connected to a steam input pipe.

[0014] As an improvement to the above technical solution, a tail cooler is also included, wherein the tail gas output ends of the esterification separator, the crude grease separator and the crude grease intermediate tank are all connected to the tail cooler.

[0015] Compared with the prior art, the beneficial effects of this application are:

[0016] This invention relates to a pressurized esterification production line for ethyl acetate. The raw materials for preparing ethyl acetate are fed into the esterification unit through a feed inlet pipe. After the esterification reaction, ethyl acetate is generated. The reactants will then pass through an esterification separation unit for separation treatment to separate ethyl acetate from residual alcohols, allowing low-boiling-point alcohols and air to be discharged together, thereby improving the purity of ethyl acetate. During the separation process, a pressurized pump can accelerate the separation speed of ethyl acetate. Finally, the product passes through a crude ester treatment unit for water washing and other treatments to obtain crude ester, which is stored in a crude ester intermediate tank for subsequent distillation operations. Attached Figure Description

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a flowchart illustrating the process of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the production line structure according to an embodiment of the present utility model. Figure 1 ;

[0020] Figure 3 This is a schematic diagram of the production line structure according to an embodiment of the present utility model. Figure 2 . Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] like Figures 1 to 3As shown, this utility model provides a pressurized esterification production line for ethyl acetate, including an esterification unit 100, whose input end is connected to a feed input pipe 110; an esterification separation unit 200, whose input end is connected to the output end of the esterification unit 100, and a pressurization pump 210 connected to the esterification separation unit 200; and a crude ester treatment unit 300, whose input end is connected to the output end of the esterification unit 100, and a water washing pump 310 connected to the crude ester treatment unit 300. The raw materials for preparing ethyl acetate, such as ethanol and acetic acid, are input into the esterification unit 100 through the feed input pipe 110. The esterification unit 100 is used for the esterification reaction, the esterification separation unit 200 is used to separate the ethyl acetate, and the crude ester treatment unit 300 is used to wash the ethyl acetate with water to obtain crude ester for subsequent distillation operations. Specifically, the esterification unit 100 in this application is provided in two sets, and the two sets of esterification units 100 are arranged in parallel.

[0025] In a specific embodiment of this application, the esterification unit 100 includes an esterification reboiler 120, an esterification kettle 130, and an esterification tower 140. The feed inlet pipe 110 is connected to the esterification reboiler 120, the output end of the esterification reboiler 120 is connected to the input end of the esterification kettle 130, and the output end of the esterification kettle 130 is connected to the input end at the bottom of the esterification tower 140. A steam inlet pipe 121 is connected to the esterification reboiler 120. The raw material is heated in the esterification reboiler 120 and then fed into the esterification kettle 130 in the form of a boiling product. The raw material is thoroughly stirred and mixed in the esterification kettle 130 to carry out the esterification reaction, and then fed into the esterification tower 140 from the bottom. The generated ethyl acetate, water, and a small amount of unreacted alcohol will be separated from the top of the esterification tower 140.

[0026] In a specific embodiment of this application, the esterification separation unit 200 includes an esterification condenser 220, an esterification separator 230, and a crude ester heat exchanger 240. The input end of the esterification condenser 220 is connected to the output end of the top of the esterification tower 140, the input end of the esterification separator 230 is connected to the output end of the esterification condenser 220, and the crude ester heat exchanger 240 is connected to both the input and output ends of the esterification separator 230. The pressure pump 210 is connected to the crude ester heat exchanger 240. Ethyl acetate and water distilled from the top of the esterification tower 140 enter the esterification condenser 220, where they are condensed and separated. The resulting crude ethyl acetate enters the esterification separator 230 to further remove residual alcohol, increasing the purity of the crude ethyl acetate, and then passes through the crude ester heat exchanger 240. Specifically, the crude grease heat exchanger 240 is provided with a reflux pipe 241 connected to the esterification tower 140. A water reflux pump 250 is connected to the reflux pipe 241. After being processed by the crude grease heat exchanger 240, the water can be returned to the esterification tower 140 through the reflux pipe 241.

[0027] In a specific embodiment of this application, the crude grease processing unit 300 includes a crude grease cooler 320, an esterification water washing mixer 330, a crude grease separator 340, and a crude grease intermediate tank 350. The input end of the crude grease cooler 320 is connected to the output end of the crude grease heat exchanger 240. The input end of the esterification water washing mixer 330 is connected to the output end of the crude grease cooler 320. The input end of the crude grease separator 340 is connected to the output end of the esterification water washing mixer 330. The output end of the crude grease separator 340 is connected to the crude grease intermediate tank 350. The water washing pump 310 is connected to the esterification water washing mixer 330. First, the grease cooler 320 cools the crude grease. To further improve purity, it needs to be washed with water by the water washing mixer 330 to further remove unreacted raw materials, catalyst residues, etc., and water washing can also reduce environmental pollution. After washing, the crude grease is separated by the crude grease separator 340 and stored in the crude grease intermediate tank 350.

[0028] In addition, to facilitate the pretreatment of raw materials, this application also includes a batching unit 400, which includes a batching preheating mixer 410. The batching preheating mixer 410 is connected to an alcohol input pipe 411 and an acetic acid input pipe 412. The output end of the batching preheating mixer 410 is connected to a batching high-level tank 420, and the output end of the batching high-level tank 420 is connected to an esterification reboiler 120. The raw materials are initially heated in the batching preheating mixer 410. Specifically, the batching unit 400 also includes a hot water tank 430, which is connected to the batching preheating mixer 410 via a circulating water inlet pipe 431 and a circulating water outlet pipe 432.

[0029] Furthermore, it also includes a tail cooler 500, the tail gas output ends of the esterification separator 230, the crude grease separator 340 and the crude grease intermediate tank 350 are all connected to the tail cooler 500 to collect and treat the tail gas generated during the production process of the production line.

[0030] This utility model discloses a pressurized esterification production line for ethyl acetate. The raw materials for preparing ethyl acetate are fed into the esterification unit 100 through the feed input pipe 110. After the esterification reaction, ethyl acetate is generated. The reactants will continue to pass through the esterification separation unit 200 for separation treatment to separate ethyl acetate from residual alcohols, allowing low-boiling alcohols and air to be discharged together, thereby improving the purity of ethyl acetate. During the separation process, the pressurization pump 210 can accelerate the separation speed of ethyl acetate. Finally, it passes through the crude ester treatment unit 300 for water washing and other treatments to obtain crude ester, which is stored in the crude ester intermediate tank 350 for subsequent distillation operations.

[0031] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A pressure esterification production line for ethyl acetate, characterized in that, include The esterification unit has a feed input pipe connected to its input end; An esterification separation unit, the input of which is connected to the output of an esterification unit, and a pressure pump is connected to the esterification separation unit; The crude grease processing unit has its input end connected to the output end of the esterification unit, and a water washing pump is connected to the crude grease processing unit.

2. The ethyl acetate pressurized esterification production line according to claim 1, characterized in that, The esterification unit is provided in two groups, and the two groups of esterification units are arranged in parallel.

3. The ethyl acetate pressurized esterification production line according to claim 1 or 2, characterized in that, The esterification unit includes an esterification reboiler, an esterification kettle, and an esterification tower. The feed input pipe is connected to the esterification reboiler, the output end of the esterification reboiler is connected to the input end of the esterification kettle, and the output end of the esterification kettle is connected to the input end at the bottom of the esterification tower.

4. The ethyl acetate pressurized esterification production line according to claim 3, characterized in that, The esterification separation unit includes an esterification condenser, an esterification separator, and a crude grease heat exchanger. The input end of the esterification condenser is connected to the output end of the top of the esterification tower. The input end of the esterification separator is connected to the output end of the esterification condenser. The crude grease heat exchanger is connected to the output end of the esterification separator. The pressurization pump is connected to the crude grease heat exchanger.

5. The ethyl acetate pressurized esterification production line according to claim 4, characterized in that, The crude grease heat exchanger is equipped with a reflux pipe connected to the esterification tower, and a water reflux pump is connected to the reflux pipe.

6. The ethyl acetate pressurized esterification production line according to claim 4, characterized in that, The crude grease processing unit includes a crude grease cooler, an esterification and washing mixer, a crude grease separator, and a crude grease intermediate tank. The input end of the crude grease cooler is connected to the output end of the crude grease heat exchanger. The input end of the esterification and washing mixer is connected to the output end of the crude grease cooler. The input end of the crude grease separator is connected to the output end of the esterification and washing mixer. The output end of the crude grease separator is connected to the crude grease intermediate tank. The washing pump is connected to the esterification and washing mixer.

7. The ethyl acetate pressurized esterification production line according to claim 3, characterized in that, It also includes a batching unit, which includes a batching preheating mixer connected to an alcohol input pipe and an acetic acid input pipe. The output end of the batching preheating mixer is connected to a batching high-level tank, and the output end of the batching high-level tank is connected to an esterification reboiler.

8. The ethyl acetate pressurized esterification production line according to claim 7, characterized in that, The batching unit also includes a hot water tank, which is connected to the batching preheating mixer via a circulating water inlet pipe and a circulating water outlet pipe.

9. The ethyl acetate pressurized esterification production line according to claim 3, characterized in that, The esterification reboiler is connected to a steam input pipe.

10. The ethyl acetate pressurized esterification production line according to claim 6, characterized in that, It also includes a tail cooler, and the tail gas output ends of the esterification separator, crude ester separator and crude ester intermediate tank are all connected to the tail cooler.

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