Method for improving product quality in MMA production by acetone cyanohydrin method

A technology for acetone cyanohydrin and product quality, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as affecting product quality, high impurity content, and pressure fluctuations in esterification reactors

Inactive Publication Date: 2020-10-27
JIANGSU SAILBOAT PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During this process, the temperature of the gas phase is relatively high, and after contacting with the washing water, the pressure of the esterification reactor will fluctuate during the formation and rupture of the generated foam, resulting in higher impurity content in the crude MMA after washing, which will affect the quality of the final product.

Method used

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  • Method for improving product quality in MMA production by acetone cyanohydrin method
  • Method for improving product quality in MMA production by acetone cyanohydrin method
  • Method for improving product quality in MMA production by acetone cyanohydrin method

Examples

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Effect test

Embodiment 1

[0021] Embodiment 1, the method for improving product quality in the production of MMA by acetone cyanohydrin method,

[0022] HCN (by-product of acrylonitrile production) reacts with acetone to generate acetone cyanohydrin. The initial reaction temperature is 80°C, and then rapidly rises to 120°C. The entire reaction time is 1h. Then methanol and water esterify methacrylic acid amide sulfate, the reaction temperature is 100°C, the pressure is 7atm, and the time is 1h. Dehydration, hydrolysis and esterification generate MMA. An MMA washing tower is installed to eliminate MAA (methacrylic acid) in the esterification gas phase gas. Next to the spray water flow meter of the washing tower, a defoamer configuration tank is set, and the defoamer configuration tank is communicated with the spray water pipeline through the defoamer delivery pipeline, and the mass concentration of the washing tower delivery is 12.5%XP- 600 modified polyether defoamer aqueous solution, a metering pump...

Embodiment 2

[0023] Embodiment 2, the method for improving product quality in the production of MMA by acetone cyanohydrin method,

[0024] HCN (by-product of acrylonitrile production) reacts with acetone to generate acetone cyanohydrin. The initial reaction temperature is 100°C, and then rapidly rises to 160°C. The entire reaction time is 1h. Then methanol and water esterify methacrylic acid amide sulfate, the reaction temperature is 150°C, the pressure is 7atm, and the time is 1h. Dehydration, hydrolysis and esterification generate MMA. An MMA washing tower is installed to eliminate MAA (methacrylic acid) in the esterification gas phase gas. Next to the spray water flowmeter of the washing tower, a defoamer configuration tank is set, and the defoamer configuration tank is communicated with the spray water pipeline through the defoamer delivery pipeline, and the mass concentration of the washing tower delivery is 25%XP- 600 modified polyether defoamer aqueous solution, a metering pump i...

Embodiment 3

[0025] Embodiment 3, the method for improving product quality in the production of MMA by acetone cyanohydrin method,

[0026] HCN (by-product of acrylonitrile production) reacts with acetone to generate acetone cyanohydrin. The initial reaction temperature is 90°C, and then rapidly rises to 140°C. The entire reaction time is 1h. Then methanol and water esterify methacrylic acid amide sulfate, the reaction temperature is 1300°C, the pressure is 7atm, and the time is 1h. Dehydration, hydrolysis and esterification generate MMA. An MMA washing tower is installed to eliminate MAA (methacrylic acid) in the esterification gas phase gas. Next to the spray water flow meter of the washing tower, a defoamer configuration tank is arranged, and the defoamer configuration tank is communicated with the spray water pipeline through the defoamer delivery pipeline, and the mass concentration of the washing tower delivery is 18%XP- 600 modified polyether defoamer aqueous solution, a metering ...

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PUM

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Abstract

The invention relates to a method for improving product quality in MMA production by an acetone cyanohydrin method. According to the method, a defoaming agent is introduced into a washing tower to improve the quality of MMA, wherein the main component of the defoaming agent is an XP-600 modified polyether defoaming agent. According to the invention, the defoaming agent is added into the washing tower, so that the foaming phenomenon in the tower can be effectively solved, the pressure fluctuation in the tower is effectively controlled, the esterification kettle is stable in evaporation, the reaction safety is enhanced, the washing effect is obvious, the acidity in the finished MMA product is obviously reduced, the operation period of the washing tower can be prolonged, and the product quality is improved.

Description

technical field [0001] The invention relates to the field of MMA production, in particular to a method for improving product quality in the production of MMA by the acetone cyanohydrin method. Background technique [0002] MMA is an acrylic resin whose main component is methyl methacrylate. It is mainly used in the manufacture of plexiglass, building decoration materials, floor coatings, waterproof coatings, industrial parts, information materials, and packaging of electrical components. [0003] At present, the world's industrialized and operating MMA production technologies mainly include acetone cyanohydrin method (ACH method), isobutylene method (including traditional i-C4 method, tert-butanol method and ASAHI method), ethylene method (BASF method) and improved acetone method. Cyanohydrin method (MGC method). The acetone cyanohydrin method (ACH method) starts with acetone and hydrocyanic acid (or purchased ACH) as raw materials, and then undergoes dehydration, hydrolysi...

Claims

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Application Information

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IPC IPC(8): C07C67/20C07C67/62C07C69/54C07C253/00C07C255/16C07C231/06C07C233/09
CPCC07C67/20C07C67/62C07C231/06C07C253/00C07C233/09C07C255/16C07C69/54
Inventor 王克荣蒲斐寇明阳赵震
Owner JIANGSU SAILBOAT PETROCHEMICAL CO LTD
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