Method for preparing 1-Methoxy-2-propyl acetate by continuous esterification reaction

A technology of propylene glycol methyl ether acetate and propylene glycol methyl ether, which is applied in the field of preparation of propylene glycol methyl ether acetate, can solve the problems of complex technological process, low production efficiency, a large amount of solid waste and waste water, etc., and achieves simple operation mode and high production efficiency. The effect of cost reduction and high production efficiency

Active Publication Date: 2009-01-07
江苏德纳化学股份有限公司
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of propylene glycol methyl ether acetate, this method can overcome the product existing in the existing intermittent production process to be processed through neutralization and water washing, and technological process is complicated, production efficiency is low, produces a large amount of Disadvantages such as solid waste and waste water, the present invention can realize the continuous production of propylene glycol methyl ether acetate, and reduce the discharge of waste residue and waste water in the production process, improve the production efficiency of propylene glycol methyl ether acetate, and reduce its production cost

Method used

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  • Method for preparing 1-Methoxy-2-propyl acetate by continuous esterification reaction

Examples

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Embodiment 1

[0020] process such as figure 1 As shown, the raw materials propylene glycol methyl ether and acetic acid preheated to 110°C are fed into the first-stage fixed-bed reactor 1 equipped with 5L solid acid catalyst continuously at a molar ratio of 1:1 at a flow rate of 15L / h. The esterification reaction temperature 110℃, space velocity is 3h -1 . The material reacted in the first fixed-bed reactor 1 enters the distillation tower 3. In the distillation tower 3, the water generated by the esterification reaction forms an azeotrope at 68-71 °C in the presence of water-carrying agent benzene and is continuously absorbed separate. The dehydrated material is continuously drawn out with a flow rate of 30L / h in the stripping section of the distillation tower 3 and transported to the second stage fixed-bed reactor 2 equipped with a 5L solid acid catalyst to continue the esterification reaction. The reaction temperature is 120 ℃, space velocity is 6h -1. The material flow rate input to...

Embodiment 2

[0022] process such as figure 1 As shown, the raw materials propylene glycol methyl ether and acetic acid preheated to 90 °C are continuously input into the first-stage fixed-bed reactor 1 equipped with 5 L solid acid catalyst at a molar ratio of 1.5:1 at a flow rate of 10 L / h, and the esterification reaction The temperature is 90°C and the space velocity is 2h -1 . The materials reacted in the first fixed-bed reactor 1 enter the distillation tower 3, and in the distillation tower 3, the water generated by the esterification reaction forms an azeotrope at 69-71 °C in the presence of cyclohexane water-carrying agent and continuously was separated. The esterification reaction material from which moisture has been removed is continuously extracted at a flow rate of 10L / h in the stripping section of the distillation tower 3 and transported to the second-stage fixed-bed reactor 2 equipped with 5L solid acid catalyst, and the esterification reaction temperature is 90°C , airspeed...

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Abstract

The invention discloses a process for preparing propylene glycol methyl ether acetate by continuous esterification reaction, which adopts propylene glycol methyl ether and acetic acid as the raw materials. The process is characterized in that a solid acid catalyst is adopted to carry out two-section fixed bed continuous esterification reaction at the esterification temperature of 70 to 150 DEG C; water generated in the sterification reaction is removed by azeotropic distillation; and the result of the esterification reaction is rectified to remove and recover unreacted propylene glycol methyl ether and acetic acid to obtain propylene glycol methyl ether acetate. The method can achieve continuous production of propylene glycol methyl ether acetate, and has the advantages of simple operation manner, greatly improved production efficiency of propylene glycol methyl ether acetate, lowered production cost, reduced emission of solid contaminants and wastewater, and excellent large-scale industrial application value.

Description

technical field [0001] The present invention relates to a kind of preparation method of propylene glycol methyl ether acetate, especially relate to a kind of method of continuous esterification reaction preparation propylene glycol methyl ether acetate. Background technique [0002] Propylene glycol methyl ether acetate (PMA) is an important class of industrial solvents. The solvent has a unique molecular structure. There are both non-polar parts and polar groups in the same molecule. All have good dissolving ability, and its dissolving performance is much higher than general solvents and propylene glycol ether and glycol ether solvents. Because propylene glycol methyl ether acetate has the characteristics of high solvent performance, good thermal stability, small viscosity change, high foaming and low corrosion, it is widely used in industries such as coatings, detergents, printing and dyeing, pesticides and polymer additives. [0003] Propylene glycol methyl ether acetate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/16C07C67/08B01J31/10
Inventor 秦旭东秦怡生陈荣福哈健王伟蒋大智
Owner 江苏德纳化学股份有限公司
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