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Method for preparing methyl methacrylate from reactive amide salt

A technology of methyl methacrylate and crude methyl methacrylate, applied in the direction of amide preparation, carboxylate separation/purification, carboxylate preparation, etc., to achieve the effect of simple process, high purity and easy control

Inactive Publication Date: 2019-11-22
陈国良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is the high demand for acids and amines, which are used to catalyze the reaction
Therefore, a large amount of waste products are generated

Method used

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  • Method for preparing methyl methacrylate from reactive amide salt

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Embodiment 1

[0035] Embodiment 1: as figure 1 Shown, this prepares the method for methyl methacrylate by reaction amide salt, comprises the following steps:

[0036] (1) the amide salt adopts a plurality of esterification reactors connected in series with gas phase and liquid phase lined PTFE pipelines to carry out multiple esterification reactions successively, and gather the gas phase materials after multiple esterification reactions;

[0037] S11 The reaction amide salt from the amide reactor enters the first esterification reactor 1 by gravity and is hydrolyzed into methacrylic acid, and methanol is passed into the first esterification reactor 1, and in the first esterification reactor 1 The temperature of the gas phase is controlled by cascade adjustment of the water phase from the extractor in the regulator FIC and the gas phase temperature TIC of the first esterification reactor 1, and the low boilers containing methanol and MMA from the rectification process are controlled by the r...

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Abstract

The invention relates to a method for preparing methyl methacrylate from reactive amide salt, which comprises the following steps: (1) sequentially carrying out multiple esterification reactions on the amide salt by using a plurality of esterification reactors connected in series through gas-phase and liquid-phase PTFE-lined pipelines, and collecting the gas-phase material after multiple esterification reactions; (2) discharging the gas-phase material collected in the step (1) into a methacrylic acid separation tower to perform vapor-liquid exchange separation with a gas-liquid separation tank, and adding gaseous ammonia to neutralize to obtain methyl methacrylate; and (3) condensing the methyl methacrylate obtained in the step (2) for multiple times for subsequent processes. According tothe method, the high-purity methyl methacrylate is obtained, and the method is simple and mature in process, easy to control and beneficial to large-scale industrialization.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for preparing methyl methacrylate from a reactive amide salt. Background technique [0002] Methyl methacrylate is an organic compound, also known as MMA, referred to as methyl methyl ester. It is an important chemical raw material and a monomer for the production of transparent plastic polymethacrylamide sulfate. It is flammable, has a strong pungent smell, has moderate toxicity, reproductive toxicity and teratogenic effects, and long-term contact should be avoided. Used in the manufacture of plexiglass, coatings, lubricating oil additives, plastics, adhesives, resins, wood impregnation agents, motor coil impregnation agents, ion exchange resins, paper polishes, textile printing and dyeing auxiliaries, leather treatment agents, printing and dyeing auxiliaries and insulating potting materials, etc. In addition, it can also be copolymerized with other monom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/06C07C51/42C07C51/50C07C57/04C07C67/08C07C67/48C07C67/62C07C69/54
CPCC07C51/06C07C51/42C07C51/50C07C67/08C07C67/48C07C67/62C07C57/04C07C69/54
Inventor 陈国良
Owner 陈国良
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