Electronic grade malonic acid

A malonic acid, electronic-grade technology, applied in the field of malonic acid, industrial mass production of malonic acid, can solve the problems such as the purity and quality can not meet the use of the electronic industry, the yield of malonic acid is low, etc., and achieve high use Value, Product Yield, Easy-to-Get Results

Active Publication Date: 2017-04-19
SUQIAN NANXIANG CHEM MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a malonic acid product of electronic grade purity for use in the electronics industry, mainly to solve the problem of low yield of malonic acid in the prior art, and in terms of purity, impurities, chlorides, sulfates and heavy metals. The quality cannot meet the technical problems used by the electronics industry

Method used

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  • Electronic grade malonic acid
  • Electronic grade malonic acid

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Experimental program
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Effect test

Embodiment 1

[0027] Put 132g of dimethyl malonate and 400g of deionized water in the glass reactor containing the treated catalyst, then start to heat up to 70-80°C, start hydrolysis under reduced pressure, and distill out crude methanol in 2-3 hours Solution, obtain malonic acid solution and measure the content of malonic acid, calculate the transformation rate of malonic acid more than 99%;

[0028] The malonic acid solution prepared above was decolorized and filtered, concentrated under negative pressure, and crystallized and centrifuged to obtain 95.1 g of malonic acid crude product, and recovered the centrifuged mother liquor to obtain 7.1 g of malonic acid crude product. Combine the crude malonic acid and add 50g of deionized water to heat and dissolve, filter and decolorize, cool and crystallize and centrifuge to obtain the semi-finished product of malonic acid, and finally dry it to obtain 101.4g of electronic grade finished product of malonic acid. The content is above 99.5%, and t...

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Abstract

Disclosed is electronic grade malonic acid. The electronic grade malonic acid is obtained by hydrolyzing of dimethyl malonate and deionized water in the existence of a catalyst. The content of the dimethyl malonate and the deionized water is larger than 99.8%, the moisture content is smaller than 50PPM, the chloride content is smaller than 5PPM, the sulfate content is smaller than 5PPM, and the content of heavy metal ions is smaller than 5PPM. The technical problems that the yield of malonic acid in the prior art is low; and the quality on the aspects of purity, impurities, chloride, sulfate and heavy metal cannot meet the using requirement of the electronic industry are effectively solved.

Description

technical field [0001] The invention relates to malonic acid, especially malonic acid specially used in the electronic industry, belongs to the technical field of organic chemical synthesis and refining, and is suitable for industrial mass production of malonic acid. Background technique [0002] Malonate CH 2 (COOH) 2 Also known as carrot acid, beet acid, and malic acid, it has a wide range of uses, mainly used in pharmaceutical intermediates, flavors and fragrances, resin adhesives, electroplating polishing agents, explosion control agents, heat welding fluxes, etc. The latest heavy metal cleaning agent used in the electronics industry has higher technical requirements than the pharmaceutical industry. The traditional production process uses chloroacetic acid as a raw material, which is obtained through neutralization, cyanation, acidification, dehydration and other steps, and its content and impurities cannot meet the requirements of the electronics industry. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/09C07C51/42C07C51/43C07C55/08C07C27/02C07C29/80C07C31/04
CPCY02P20/52C07C51/09C07C29/09C07C29/80C07C51/42C07C51/43C07C55/08C07C31/04
Inventor 朱伟顾衍庆密龙风张宏云
Owner SUQIAN NANXIANG CHEM MFG CO LTD
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