Ethylene glycol diacetate or propylene glycol diacetate production system and method

A technology of propylene glycol diacetate and ethylene glycol diacetate, which is applied in the field of diol diacetate preparation, can solve problems such as difficult product separation, many by-products, complicated process flow, etc., so as to improve product purity and increase The effect of production efficiency

Pending Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It has been disclosed in the prior art that the use of water-carrying agents in the production of glycol diacetate, such as toluene, can accelerate the evaporation of water, one of the reaction products in the reaction process, so as to promote the reaction, but the process is complicated and the side effects Due to the large number of products and the difficulty in separating the final products, the conversion rate of the reactants can still only reach about 97%, resulting in a large waste of raw materials and energy consumption.

Method used

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  • Ethylene glycol diacetate or propylene glycol diacetate production system and method

Examples

Experimental program
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Effect test

Embodiment 1~7

[0022] A production process of ethylene glycol diacetate, according to the formula in parts by weight: 1 part of catalyst, 10-20 parts of ethylene glycol, 20-200 parts of acetic acid, 30-100 parts of water-carrying agent are added to reactor 2, normal pressure, reaction The temperature is 110~150°C, and the reaction is 10~50h; the reacted materials continue to enter the light removal tower 4 from the bottom of the reaction kettle 2, and the light removal tower 4 controls the top temperature of the tower to 110~140°C, and the pressure is normal pressure; the materials obtained from the tower kettle enter Weight removal tower, weight removal tower 5 vacuum degree -0.093~-0.097MPa, control tower top temperature 130~140°C, and get ethylene glycol diacetate at the top of the tower.

[0023] Wherein, filter screen is arranged in reactor 2 to do dividing plate, and the macroporous cation exchange resin catalyst of sulfonic acid treatment is placed above dividing plate; Reactor 2 top c...

Embodiment 8~14

[0029] A kind of propylene glycol diacetate production technology, it is characterized in that: formula according to weight: 1 part of catalyst, 10-20 parts of propylene glycol, 20-200 parts of acetic acid, 30-100 parts of water-carrying agent are added to reactor 2, normal pressure, reaction The temperature is 110~150°C, and the reaction is 10~50h; the reacted material enters the light removal tower 4 from the bottom of the reaction kettle 2, and the light removal tower 4 controls the top temperature of the tower to 110~140°C, and the pressure is normal pressure; the material obtained from the tower kettle enters the light removal tower 4 Heavy tower, weight-removing tower 5 vacuum degree -0.093~-0.097MPa, control tower top temperature 130~140°C, the top of the tower can obtain propylene glycol diacetate, adopt the same production system as in Example 1.

[0030] Wherein, filter screen is arranged in reactor 2 to do dividing plate, and the macroporous cation exchange resin cat...

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Abstract

The invention discloses an ethylene glycol diacetate or propylene glycol diacetate production system and process, and belongs to the technical field of dihydric alcohol diacetate preparation. Ethylene glycol diacetate and propylene glycol diacetate are solvents with good environment-friendly performance and are low in toxicity and cost, but the problems of low raw material conversion rate and low product purity generally exist in the prior art. A production system formed by connecting a rectifying tower (1), a reaction kettle (2), a dehydration bag (3), a light component removal tower (4) and a heavy component removal tower (5) is utilized, the water-carrying agent can carry out water generated in the reaction, the conversion rate can be effectively increased, the product purity is improved, the water-carrying agent repeatedly participates in one-time reaction, impurities in the product are distributed and separated, the system realizes continuous production, and the production cost is reduced. The product quality is improved.

Description

technical field [0001] The invention discloses a production system and process of ethylene glycol diacetate or propylene glycol diacetate, belonging to the technical field of diol diacetate preparation. Background technique [0002] Ethylene glycol diacetate (EGDA) is an environmentally friendly, high boiling point, safe polar solvent, widely used in the pharmaceutical industry; organic ester curing agent for casting resins; also as an excellent solvent for various organic resins, especially nitrocellulose , and raw materials for leather brighteners; as solvents for nitro spray paints, printing inks, cellulose esters, and fluorescent paints in paints and coatings. Propylene glycol diacetate (PGDA) is a functional environmentally friendly solvent with the general chemical properties of an ester. It is easily soluble in alcohol, ether and other organic solvents, has excellent leveling property, low odor, safe and non-toxic, strong solvency, good anti-foaming property, and str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C69/16C07C67/54
CPCC07C67/08C07C67/54C07C69/16
Inventor 侯磊吕爱梅张麟平杨忠梅李玉田
Owner CHINA PETROLEUM & CHEM CORP
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