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Method for preparing glycidyl methacrylate

A technology of methacrylic acid and glycidyl ester, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of excessive investment in the early stage, large reaction heat, and difficult operation. The effect of less initial investment, mild response, and low equipment requirements

Inactive Publication Date: 2005-01-26
张展洪 +1
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Problems solved by technology

In the above method, in the first step method, in addition to methyl endenoic acid and alkali metal salt, a polymerization inhibitor is added. It can be clearly seen that the reaction must be intense, and the reaction exotherm is extremely large. The purpose of adding the polymerization inhibitor is to Reduce the possibility that the reactants are easily polymerized into solids at too high a temperature, so the operation is difficult
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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Embodiment Construction

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

[0015] A. Preparation of sodium methacrylate:

[0016] In a four-neck flask equipped with stirring material, reflux condenser, thermometer and dropping funnel, add 80ml of water, then add 102g of 50% NaOH aqueous solution cooled to room temperature, stir well, and slowly drop 100ml Methacrylate. Control the reaction temperature below 55°C. After the addition is complete, continue stirring for 1 hour, then discharge the slurry in the flask into a stainless steel pan, and then control the temperature in an oven to dry under 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 condenser and a thermometer, add 80g of dry sodium methacrylate, 0.4g of polymerization inhibitor p-hydroxyanisole, and 1.5g of catalyst tetramethylethylenediammonium. Transfer agent triethylbenzyl ammonium chloride 1g, epichlorohydr...

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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 in the molecule and epoxy groups 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 is used as solvent, methacrylic acid is used as raw material, and the catalyst is sodium carbonate. Because sodium carbonate and methacrylic acid The reaction emits heat, causing the temperature of the reaction solution to rise too fast, making the reactants easy to solidify. Therefore, some people have further studied and invented a two-step manufacturing method. For example, the Chinese invention patent application number is 92106765.8 glycidyl methacrylate manufacturing method and equipment, which discloses the use of methacrylic acid and alkali metal salt in low molecular alcohol and In a high-boiling solvent, the ...

Claims

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Application Information

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