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Method for continuously synthesizing propylene glycol methyl ether acetate

A technology of propylene glycol methyl ether acetate and propylene glycol methyl ether, which is applied in the field of synthesis of propylene glycol methyl ether acetate, can solve problems such as complex process, low production efficiency, and environmental pollution, and achieve simple operation mode and high production efficiency , The effect of less discharge of waste water and waste residue

Inactive Publication Date: 2011-10-05
东莞市同舟化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many problems in the traditional production method, such as many side reactions, strong corrosion, complex process, low production efficiency, and catalyst post-treatment produces a large amount of solid waste and wastewater, polluting the environment

Method used

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  • Method for continuously synthesizing propylene glycol methyl ether acetate
  • Method for continuously synthesizing propylene glycol methyl ether acetate

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preparation example Construction

[0022] A kind of continuous synthetic method of propylene glycol methyl ether acetate, its difference is: it comprises the following steps: take propylene glycol methyl ether and glacial acetic acid as raw material, carry out esterification reaction in the fixed-bed reactor 4 of filling acidic resin catalyst The reaction product after the esterification enters the dehydration distillation tower 5 and the azeotropic dehydrating agent for azeotropic dehydration, and the dehydrated material is continuously extracted from the bottom of the dehydration distillation tower 5 and returned to the fixed bed reactor 4 to continue the esterification reaction. After the cycle is established, the feed of raw materials is stopped until the esterification reaction balance reaches the equilibrium conversion rate; when the esterification reaction balance is reached, the continuous production is started, and the fixed bed reactor 4 starts to feed continuously, and simultaneously from the tower of ...

Embodiment 1

[0033] The technological process of the continuous synthetic method of propylene glycol methyl ether acetate is as figure 1 As shown, in the fixed bed-dehydration distillation column continuous esterification reaction section: the propylene glycol methyl ether and acetic acid which are preheated to 100°C in the propylene glycol methyl ether tank 1 and the acetic acid tank 2 respectively, with a molar ratio of 1.8: 1, the total flow rate 60ml / h, after being mixed by the static mixer 3, it is continuously pumped into the fixed-bed reactor 4 equipped with 400ml of solid acid catalyst. The esterification reaction temperature in the fixed-bed reactor is 100°C, and the reaction pressure is 0.5MPa. The reaction product after the fixed-bed esterification reaction is continuously pumped in from the top of the dehydration distillation tower 5, and the azeotropic dehydrating agent cyclohexane stored in the cyclohexane tank 6 is fed from the top of the dehydration distillation tower 5, and...

Embodiment 2

[0036] The technological process of the continuous synthetic method of propylene glycol methyl ether acetate is as figure 1As shown, in the fixed bed-dehydration distillation column continuous esterification reaction section: the propylene glycol methyl ether and acetic acid which are preheated to 100°C in the propylene glycol methyl ether tank 1 and the acetic acid tank 2 respectively, with a molar ratio of 1.8: 1, the total flow rate 60ml / h, after being mixed by the static mixer 3, it is continuously pumped into the fixed-bed reactor 4 equipped with 400ml of solid acid catalyst. The esterification reaction temperature in the fixed-bed reactor is 85°C, and the reaction pressure is 1.0MPa. The reaction product after the fixed-bed esterification reaction is continuously pumped in from the top of the dehydration distillation tower 5, and the azeotropic dehydrating agent stored in the cycloethane tank 6 is fed from the top of the dehydration distillation tower 5 by sec-butyl aceta...

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Abstract

The invention relates to a method for continuously synthesizing propylene glycol methyl ether acetate. The method is characterized in that propylene glycol methyl ether and glacial acetic acid are taken as raw materials, an esterification is carried out in a fixed bed reactor which is filled with an acidic resin catalyst; the esterified reaction product is entered into a dewatered distillation tower for performing an azeotropic dehydration with an azeotropic desiccant, the dewatered materials are continuously extracted from a tower kettle of the dewatered distillation tower and backflowed to the fixed bed reactor for continuously performing the esterification, the cycle is established and then feeding of the raw materials is stopped until the esterification achieves a balance, thereby an equilibrium conversion rate can be reached; a continuous production is performed after the esterification is reached a balance, the fixed bed reactor is performed a continuous feeding, simultaneously, product of propylene glycol methyl ether acetate is continuously taken out of the tower kettle of the dewatered distillation tower. The invention has the advantages of simple operation, high production efficiency, less discharge of waste water and waste residue in process of production, environmental protection and low cost.

Description

technical field [0001] The invention relates to a synthesis method of propylene glycol methyl ether acetate, in particular to a method for producing propylene glycol methyl ether acetate through continuous esterification. Background technique [0002] Due to its unique molecular structure, propylene glycol methyl ether acetate (PMA) has a strong solubility for polar and non-polar substances. It is an important industrial solvent with excellent performance. Its solubility is better than that of general solvents and Propylene glycol ether and ethylene glycol ether solvents have good thermal stability, small viscosity change and good environmental performance, and have been widely used in synthetic resins, coatings, inks, detergents, textile printing and dyeing, and pesticides. [0003] At present, the industry mainly adopts the intermittent esterification dehydration of propylene glycol methyl ether and glacial acetic acid to produce PMA. The catalysts used are usually inorgan...

Claims

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Application Information

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IPC IPC(8): C07C69/16C07C67/08
Inventor 刘新泰王纲司君华黄胜飘
Owner 东莞市同舟化工有限公司
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