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Method for preparing glycidyl methacrylate

A technology of methacrylic acid and glycidyl ester, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of excessive initial investment, difficult operation, high price, etc. The effect of less, less equipment requirements, and low production costs

Inactive Publication Date: 2006-04-19
张展洪 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, the solvent is a two-way choice, that is, to choose a low molecular weight alcohol, and to choose a high boiling point solvent, which shows its complexity and difficulty in operation.
In addition, there are many components, resulting in high cost
The second step is to refine the obtained crude product through a falling film distillation tower. It can be seen that there are many types of equipment and expensive prices, which increases the initial investment of the enterprise and also leads to high product costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The manufacture method of the present invention is carried out in two steps

[0015] A, the preparation of sodium methacrylate:

[0016] In a four-neck flask equipped with stirring, reflux condenser, thermometer and dropping funnel, add 80ml of water, then add 102g of 50% NaOH aqueous solution cooled to normal temperature, stir well, and slowly drop in 100ml of formazan base acrylic. Control the reaction temperature below 55°C. After the dropwise addition, continue to stir for 1 hour, discharge the slurry in the flask into a stainless steel plate, and then dry it in an oven to control the temperature below 60°C to obtain methacrylic acid. sodium salt.

[0017] B. GMA synthesis process:

[0018] In a three-necked flask equipped with a stirrer, a reflux condensation water separator, and a thermometer, add 80 g of dry sodium methacrylate, 0.4 g of a polymerization inhibitor p-hydroxyanisole, and 1.5 g of a catalyst tetramethylethylenediamine. Transfer agent triethylben...

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Abstract

Method for preparing glycidyl methacrylate which comprises two steps, (1) reacting methacrylic acid and caustic alkali in water dissolvent, obtaining the alkali metal salt of methacrylic acid, (2) preparing crude product of glycidyl methacrylate from the alkali metal salt of methacrylic acid and epichlorohydrin at the presence of inhibitor and catalyst, filtering, charging diethyl phthalate, vacuum distilling to obtain the refined product.

Description

technical field [0001] The invention relates to a method for producing a compound containing carbon-carbon double bonds and epoxy groups in the molecule by using methacrylic acid or its salts as raw materials. Background technique [0002] Glycidyl methacrylate (abbreviated as GMA), in the past, a one-step manufacturing method was reported, that is, epichlorohydrin was used as a solvent, methacrylic acid was used as a raw material, and the catalyst was sodium carbonate, because the reaction between sodium carbonate and methacrylic acid released heat , causing the temperature of the reaction solution to rise too fast, making the reactant easy to solidify. Thereby people further study again, have invented the manufacture method of two-step method, as the Chinese invention patent application number is 92106765.8 glycidyl methacrylate manufacture method and equipment, it discloses with methacrylic acid and alkali metal salt in low molecular weight alcohol and high In a boiling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C303/16
Inventor 张展洪张杰才
Owner 张展洪