Preparation method of carbon-silicon solid acid catalyst and application in extraction of organic acid in fermentation broth

A solid acid catalyst, carbon silicon technology, applied in the preparation of organic compounds, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of low extraction efficiency of low-concentration organic acids, etc., to improve the sulfonation effect and reuse. Good property, improve the effect of hydrophilic

Active Publication Date: 2017-02-08
NANJING UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Solved the problem of low extraction efficiency of low-concentration organic acids in fermentation broth

Method used

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  • Preparation method of carbon-silicon solid acid catalyst and application in extraction of organic acid in fermentation broth
  • Preparation method of carbon-silicon solid acid catalyst and application in extraction of organic acid in fermentation broth

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of carbon-silicon solid acid catalyst: Dissolve 8 g of cornstarch in water at a solid-to-liquid ratio of 1:20, add 8 g of tetraethyl orthosilicate, co-hydrolyze for two hours under boiling conditions, and age at room temperature for 1-2 days. Exchange the water in the system with ethanol, filter and dry, disperse the obtained powder into the soluble chloride salt zinc chloride solution, dry and carbonize and activate at a temperature of 500°C for 4 hours, and wash away the zinc chloride in the material with hydrochloric acid; The obtained carbon-silicon material was sulfonated with concentrated sulfuric acid at 100° C. for 2 h at a solid-to-liquid mass ratio of 1:10, cooled to room temperature, filtered and washed, and dried to obtain a carbon-silicon material solid acid catalyst.

Embodiment 2

[0035] Except that the following steps are different, the others are the same as in Example 1, and the soluble soybean starch is dissolved in water at a solid-to-liquid ratio of 1:10 to prepare a carbon-silicon solid acid catalyst.

Embodiment 3

[0037] Except that the following steps are different, all the others are the same as in Example 1, and a total of 8 g of starch from soluble potato and wheat starch (mass ratio 1: 1) are dissolved in water to prepare a carbon-silicon solid acid catalyst at a solid-to-liquid ratio of 1: 30.

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Abstract

The invention discloses a preparation method of a carbon-silicon solid acid catalyst and application in extraction of organic acid in fermentation broth. The method comprises the following steps: swelling: heating and co-hydrolyzing soluble starch with high content of straight chain molecules and silicate ester for 2 h, aging at room temperature for 1-2 days, exchanging moisture in the system with an organic solvent with lower surface tension than water, and drying; carbonization activation: carrying out one-step carbonization activation by using soluble inorganic salt or strong base under nitrogen protection; and sulfonation: carrying out sulfonation on a carbon-silicon composite material by the use of concentrated sulfuric acid, so as to obtain the carbon-silicon solid acid catalyst. The catalyst is used for extraction of low-concentration organic acid in various fermentation broths. The invention has the following advantages: the synthetic method is green, raw materials are easily available, and discharge of spend liquor and exhaust gas is less; dispersity in an aqueous solution is high; hydrophilicity is strong, and acid value is high; the synthesized material has large specific surface area; synthesis cost is low; catalytic effect is good; and the catalyst can be repeatedly used for many times.

Description

technical field [0001] The invention relates to the preparation of a carbon-silicon composite material catalyst and a method for extracting organic acids in fermentation broth. Background technique [0002] The biological fermentation process can produce a large amount of organic acids, most of which are important fine chemicals, which are widely used and have broad market prospects. The organic acids present in the biological fermentation system include: succinic acid, ammonium succinate, lactic acid, etc. The extraction of organic acids in low-concentration fermentation broth meets the requirements of green chemistry. However, due to the low concentration of acids in the system, it is difficult to find a simple and effective separation method to extract them. The extraction rate of organic acids in fermentation broth is low and serious. Hindered the further utilization of fermentation broth. Esterifying the organic matter from the fermentation broth and then extracting i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/493C07C55/10C07C59/08B01J27/224
CPCB01J27/224C07C51/493C07C55/10C07C59/08
Inventor 梁金花任晓乾孟雷成静王跃桦姜岷
Owner NANJING UNIV OF TECH
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