Fumaric acid producing method

A production method and technology of fumaric acid, applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., can solve the problems affecting the flavor of sour agents and the psychological impact of eaters, etc., and achieve the improvement of product purity and maintenance Cost reduction and power saving effect

Inactive Publication Date: 2010-07-21
ZHENJIANG KAIPU CHEM TECH CO LTD
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Problems solved by technology

If the fumaric acid produced by this method is used as a food additive, because it contains a small amount of sulf...

Method used

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Examples

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Embodiment

[0015] Put 10 tons to 11 tons of acid water solution (solution temperature: 50°C) from the phthalic anhydride production unit into the decolorization kettle (the effective volume of the decolorization kettle is 10 cubic meters) by an acid-resistant pump, and put it into the decolorization kettle (the effective volume of the decolorization kettle is 10 cubic meters). Under the agitation of the paddle stirrer, add 10 to 30 kg of activated carbon in batches, keep the temperature at 50°C to 100°C, and remove the activated carbon and solid impurities. Activated carbon selected by BET method has a specific surface area of ​​120-250m 2 / g, varieties and models with an adsorption selectivity of over 95%. After 2 to 5 hours of decolorization time, the slurry solution is put into a leaf filter (filter area 10 to 20 square meters), and the filtered filtrate is transferred to a reactor (the effective solvent of the reactor is 10 cubic meters), and the filter cake is compressed The air ha...

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Abstract

The invention relates to a fumaric acid producing method, in particular to a fumaric acid producing method by using phthalic anhydride oxidizing reaction tail gas absorbing acid water as raw material. The method comprises the following steps of: a. adding a maleic acid water solution from a phthalic anhydride producing device into a bleaching kettle, and adding active carbon to carry out adsorption bleaching; b. adding the filter liquor filtered in the previous step into a reaction kettle, adding phosphoric acid and a dimethoxy family (selenium/zinc) composite catalyst to carry out isomerization reaction, wherein the weight ratio of the dimethoxy selenium amido to dimethoxy telluride amido in the dimethoxy family (selenium/zinc) composite catalyst is 1: 0.1-0.5; c. in the crystallizing kettle, cooling and crystallizing the acid water solution converted into the fumaric acid under the stirring state, and cooling to the acid water temperature of 30 DEG C; stirring, discharging material to solid and liquid separating equipment, and drying the solid matters by drying equipment to obtain the fumaric acid finished product. The invention can enhance the quality of the fumaric acid.

Description

technical field [0001] The invention relates to a production method of fumaric acid, in particular to a production method of fumaric acid which takes acid water absorbed by tail gas of phthalic anhydride oxidation reaction as raw material. Background technique [0002] The sour water that comes down from the tail gas scrubber of a conventional phthalic anhydride production unit is usually maleic acid with a concentration of about 20%, which can be used as a raw material for the production of fumaric acid. The production process traditionally uses thiourea as a conversion isomerization catalyst. Maleic acid (maleic acid) is converted to fumaric acid (fumaric acid) by isomerization. If the fumaric acid produced by this method is used as a food additive, because it contains a small amount of thiourea, it not only affects the flavor of the sour agent, but also has a certain impact on the psychology of the eater. Contents of the invention [0003] The technical problem to be s...

Claims

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Application Information

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IPC IPC(8): C07C57/15C07C51/353
Inventor 孙楠王有喜顾晓明
Owner ZHENJIANG KAIPU CHEM TECH CO LTD
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