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Method for preparing methyl methacrylate by using methacrolein

A technology of methyl methacrylate and methacrolein, applied in the field of preparation of methyl methacrylate, can solve the problems of unfavorable reaction in the positive direction, reducing the total yield of the process and the like

Inactive Publication Date: 2013-12-04
TAICANG HENGYI MEDICINE CHEM MATERIAL FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the reaction of methacrolein oxidative esterification to generate methyl methacrylate, since the reaction process produces water, the presence of water is not only very unfavorable for the positive direction of the reaction, but also causes the hydrolysis of the product methyl methacrylate , thus reducing the overall yield of the process

Method used

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  • Method for preparing methyl methacrylate by using methacrolein
  • Method for preparing methyl methacrylate by using methacrolein

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 25 g PdCl 2 Stir and dissolve in 100 mL of 20% nitric acid aqueous solution, then add 15 g of magnesium oxide carrier, stir and impregnate for 30 min, filter, wash with water, and vacuum dry to obtain the catalyst.

Embodiment 2

[0017] The external circulation water removal system in this embodiment is a single water removal column filled with water removal agent, the size of the water removal column is 1 m×0.12 m inner diameter, and the filling rate of water removal agent is 75%.

[0018] The qualitative and quantitative detection methods of reaction substrates and products are as follows: using SE-30 (30 m×0.25 mm×0.5 μm) quartz capillary column, the temperature of the vaporization chamber is 115 °C; the temperature of the column is 105 °C; the temperature of the FID detector is 280 °C; the carrier gas: High purity N 2 ; Column flow rate: 0.6 mL / min; Split ratio: 40:1.

[0019] Pump the mixture of 70.09 g (1 mol) methacrolein and 192.24 g (6 mol) methanol into the reaction kettle, heat it to the reaction temperature of 50 °C, and carry out the oxidative esterification reaction under the action of the catalyst palladium composite oxide, the reaction During the process, the reaction mixture was fed a...

Embodiment 3

[0021] The external circulation water removal system of this embodiment is a combination of two water removal columns filled with water removal agents connected in series, where each water removal column has a size of 0.8 m x an inner diameter of 0.12 m, and the filling rate of water removal agents is 80%.

[0022] Reaction substrate and product qualitative and quantitative detection method and operation are all the same as in Example 2, and the implementation steps of changing catalyst dewatering agent and each operating parameter are as follows:

[0023] Pump the mixture of 70.09 g (1 mol) methacrolein and 128.16 g (4 mol) methanol into the reaction kettle, heat it to the reaction temperature of 60 °C, and carry out the oxidative esterification reaction under the action of the catalyst palladium composite oxide, the reaction During the process, the reaction mixture was fed at a certain flow rate into the external circulation water removal system 6 filled with anhydrous calciu...

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Abstract

The invention relates to a method for preparing methyl methacrylate by using methacrolein, and mainly solves the problem that the conversion rate of the methacrolein in the production process of the heavy chemical product, namely the methyl methacrylate in the prior art is low. The method comprises the comprises the following steps: using the methacrolein, oxygen and methanol as raw materials and heating up to the reaction temperature, and performing oxidative esterification reaction under the action of a catalyst, namely a palladium compound, wherein in the reaction process, the reaction mixture is conveyed into an external cycle dehydration system in a certain flow rate for realizing dehydration in a cycling manner, so that the reaction can be balanced and performed in the positive direction, which improves the conversion rata of the methacrolein, and realizes low-power-consumption, simple, fast and continuous production; the yield of the obtained reaction product (namely the methyl methacrylate) is greater than 93%.

Description

technical field [0001] The invention relates to a method for preparing methyl methacrylate by using methacrolein, and relates to the preparation technology of methyl methacrylate in the field of chemical industry. Background technique [0002] Methyl methacrylate is an important organic chemical raw material with a wide range of uses. It is mainly used as a polymerized monomer to produce its polymers and copolymers, and can also be used to produce high-carbon methacrylate through transesterification. Its polymer is a plastic material with excellent transparency, so it is often called plexiglass, and has excellent characteristics such as excellent weather resistance. It is also used in the production of acrylic resin, molding compound, acrylic paint, PVC additives, adhesive Mixtures, printing and dyeing auxiliaries, latex plasticizers and insulating potting materials, etc. [0003] At present, the main processes for the industrial production of methyl methacrylate include t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/54C07C67/39
Inventor 倪明前
Owner TAICANG HENGYI MEDICINE CHEM MATERIAL FACTORY
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