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Method for preparing high-purity ethylene glycol diacetate through direct esterification

A technology of ethylene glycol diacetate, which is applied in the field of preparing high-purity ethylene glycol diacetate, can solve the problems of affecting the purity of ethylene glycol diacetate, increasing the energy consumption of tower 3, and reducing the separation capacity. Achieve good economic and environmental benefits, increase economic costs, and achieve high production efficiency

Inactive Publication Date: 2019-02-22
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem that this process exists is: the material that comes out from the tower kettle of tower 3 is sent to the upper part of tower 3 after being reacted in reactor 2, the phenomenon of back-mixing easily occurs, causes the separation ability of tower 3 to decline, and then directly affects The purity of ethylene glycol diacetate, the energy consumption of tower 3 will also increase simultaneously

Method used

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  • Method for preparing high-purity ethylene glycol diacetate through direct esterification
  • Method for preparing high-purity ethylene glycol diacetate through direct esterification

Examples

Experimental program
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Effect test

Embodiment 1

[0024] process such as figure 1As shown, the raw material ethylene glycol and acetic acid are preheated to 160°C with a molar ratio of 1:2.4, and the acetic acid feed is divided into two streams, one is fed from the fifth plate of T1, and the flow rate is 11.76 kmol / h, and The reflux ratio of T1 is 0.8, the molar ratio of output and feed is 0.53, another 58.8kmol / h acetic acid and 29.4kmol / h ethylene glycol are mixed into the knapsack reactor, and the raw materials are in the reactive distillation column (T1) The internal reverse flow is fully contacted, and all the liquid phase on the plate of the reactive distillation tower (T1) is withdrawn from the side line and enters the knapsack reactor for reaction, and the reacted mixture completely enters the reactive distillation tower (T1) for separation; The water produced by the reaction and a small amount of unreacted acetic acid enter the rectification section of the reactive distillation column (T1) for separation, and then a...

Embodiment 2

[0027] process such as figure 1 As shown, the raw material ethylene glycol and acetic acid are preheated to 160°C with a molar ratio of 1:2.6, and the acetic acid feed is divided into two streams, one is fed from the fifth plate of T1, and the flow rate is 16.6 kmol / h, and The reflux ratio of T1 is 1.1, the molar ratio of output and feed is 0.53, another 55.6kmol / h acetic acid and 27.8kmol / h ethylene glycol are mixed into the knapsack reactor, and the raw materials are in the reactive distillation column (T1) The internal reverse flow is fully contacted, and all the liquid phase on the plate of the reactive distillation tower (T1) is withdrawn from the side line and enters the knapsack reactor for reaction, and the reacted mixture completely enters the reactive distillation tower (T1) for separation; The water produced by the reaction and a small amount of unreacted acetic acid enter the rectification section of the reactive distillation column (T1) for separation, and then a...

Embodiment 3

[0030] process such as figure 1 As shown, the raw material ethylene glycol and acetic acid are preheated to 160°C with a molar ratio of 1:2.6, and the acetic acid feed is divided into two streams, one is fed from the fifth plate of T1, and the flow rate is 16.6 kmol / h, and The reflux ratio of T1 is 1.3, the molar ratio of output and feed is 0.53, another 55.6kmol / h acetic acid and 27.8kmol / h ethylene glycol are mixed into the knapsack reactor, and the raw materials are in the reactive distillation column (T1) The internal reverse flow is fully contacted, and all the liquid phase on the plate of the reactive distillation tower (T1) is withdrawn from the side line and enters the knapsack reactor for reaction, and the reacted mixture completely enters the reactive distillation tower (T1) for separation; The water produced by the reaction and a small amount of unreacted acetic acid enter the rectification section of the reactive distillation column (T1) for separation, and then a...

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Abstract

The invention discloses a method for preparing high-purity ethylene glycol diacetate through direct esterification. The ethylene glycol diacetate is synthesized from ethylene glycol and acetic acid ina catalytic rectifying tower which is composed of a backpack type reactor, a rectifying section, a reaction section and a stripping section. The acetic acid is fed byin two streams, one stream of theacetic acid is fed from the lower end of the rectifying section, the other stream of the acetic acid and the ethylene glycol are mixed and then enter the backpack type reactor, the reactor contains an acid catalyst, and the ethylene glycol and the acetic acid react in the reactor and then enter a reaction rectifying tower from the upper end of the reaction rectifying tower for continuous reaction. The reaction section in the catalytic rectifying tower is filled with catalytic padding, the ethylene glycol and the acetic acid react in a tower T1 to generate the ethylene glycol diacetate (EGDA),T2 is an acetic acid recovery tower, recovered acetic acid is circularly fed into the tower T1 as a raw material, T3 is a product refining tower, ethylene glycol monoacetate (EGMA) is discharged fromthe top of the tower T3, and high-purity EGDA is discharged from a tower kettle. The method has the advantages of being high in reaction conversion rate, low in energy consumption, high in raw material utilization rate and the like.

Description

technical field [0001] The invention relates to a new process for preparing high-purity ethylene glycol diacetate, in particular to a method for preparing ethylene glycol diacetate by using a "backpack" reactor coupled with a reactive distillation process. Background technique [0002] Ethylene glycol diacetate (EGDA), also known as ethylene glycol diacetate, is a colorless liquid with a boiling point of 190.2°C. It is an efficient, safe, non-toxic and environmentally friendly organic solvent. Widely used in the pharmaceutical industry, casting resin organic ester curing agent, and also as an excellent solvent for various organic resins, especially nitrocellulose, and raw materials for leather brighteners; in paints and coatings as nitro spray paint, printing ink, cellulose ester , Fluorescent paint solvent. [0003] The traditional methods for the synthesis of ethylene glycol diacetate include the esterification of acetate, the catalytic addition of ethylene oxide and acet...

Claims

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Application Information

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IPC IPC(8): C07C69/16C07C67/08C07C67/54
CPCC07C67/08C07C67/54C07C69/16Y02P20/10
Inventor 王红星周庆邱挺叶长燊李玲黄智贤王晓达杨臣
Owner FUZHOU UNIV
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