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Refining method of carbon 11-18 long chain diacid

A technology of long-chain dibasic acid and refining method, applied in the field of carbon 11-18 long-chain dibasic acid refining, can solve the problems of low yield, low purity and high impurity content, and achieves short process route, high product purity, high yield effect

Inactive Publication Date: 2003-04-16
ZIBO GUANGTONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, there are two main methods for producing long-chain dibasic acids at home and abroad. One is chemical synthesis, which uses butadiene as raw material to produce long-chain dibasic acids through high-pressure polymerization. The purity is high, but the process is complicated and dangerous. , the yield is low, the raw material is expensive, and the cost is high; another method is the biological fermentation method, which uses the specific oxidation ability of microorganisms to oxidize the methyl groups at both ends of n-alkanes to produce dibasic acids with the same carbon chain as the substrate. Simple, safe and easy to operate, high yield, low raw material price, but high impurity content, low purity, poor quality, seriously restricting its scope of application

Method used

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Effect test

Embodiment 1

[0018] The carbon 11-18 long-chain dibasic acid refining method of the present invention utilizes petroleum fermentation to produce long-chain dibasic acids according to two steps of extraction and purification:

[0019] (1) extraction

[0020] Heat the fermentation termination solution to 60-70°C, add industrial sodium hydroxide lye to adjust the pH of the solution to 12, then raise the temperature to 90°C, put it into the static stratification tank, and let it stand for 25 hours to separate into upper, middle and lower Three layers (that is: the upper layer is an oil layer, the middle layer is a clear liquid layer, and the lower layer is a bacterium layer), the oil layer is recycled, the middle clear liquid and the lower layer thalline are taken out and put into a decolorization tank respectively, and water is added to control the acid content. 6%, add 0.9% activated carbon, heat up to 70-80°C, press into the plate frame to decolorize. When the clear liquid is slightly yell...

Embodiment 2

[0024] The carbon 11-18 long-chain dibasic acid refining method of the present invention utilizes petroleum fermentation to produce long-chain dibasic acids according to two steps of extraction and purification:

[0025] Heat the fermentation termination liquid to 70-90°C, add industrial sodium hydroxide lye to adjust the pH of the solution to 13, put it into a static stratification tank, and let it stand for 30 hours to separate into upper, middle and lower layers. Take out the middle supernatant and the lower layer of bacteria and put them into the decolorization tank respectively, and add water to control the acid content at 8%, add 1% activated carbon, heat up to 60-70°C, press into the plate frame for decolorization. When the clear liquid is slightly yellow, put the clear liquid into the crystallization tank, and when the temperature of the decolorized clear liquid is raised to 50-70°C, add concentrated sulfuric acid with a concentration of 93% into the crystallization tan...

Embodiment 3

[0029] The carbon 11-18 long-chain dibasic acid refining method of the present invention utilizes petroleum fermentation to produce long-chain dibasic acids according to two steps of extraction and purification:

[0030] Heat the fermentation termination solution to 40-60°C, add industrial sodium hydroxide lye to adjust the pH of the solution to 11, then raise the temperature to 90°C, put it into the tank and let it stand for stratification for 20 hours, and divide it into upper, middle and The next three floors. Take out the middle supernatant and the lower layer of bacteria and pour them into the decolorization tank, add water to control the acid content at 10%, add 1.1% activated carbon, heat up to 70-90°C, press into the plate frame for decolorization. When the clear liquid is slightly yellow, pour the clear liquid into the crystallization tank, and when the temperature of the decolorized clear liquid is raised to 60-80°C, add concentrated sulfuric acid with a concentratio...

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Abstract

A process for refining (or purifying) C11-18 long-chain dibasic acid includes such steps as dissolving the said long-chain dibasic acid prepared by fermenting petroleum in organic solvent, filtering,cooling the filtrate, crystallizing and drying. Its advantages are high purity and output rate, and low cost.

Description

technical field [0001] The invention relates to a refining method of carbon 11-18 long-chain dibasic acid, which belongs to the refining and purification technology of long-chain dibasic acid. Background technique [0002] At present, there are two main methods for producing long-chain dibasic acids at home and abroad. One is chemical synthesis, which uses butadiene as raw material to produce long-chain dibasic acids through high-pressure polymerization. The purity is high, but the process is complicated and dangerous. , the yield is low, the raw material is expensive, and the cost is high; another method is the biological fermentation method, which uses the specific oxidation ability of microorganisms to oxidize the methyl groups at both ends of n-alkanes to produce dibasic acids with the same carbon chain as the substrate. Simple, safe and easy to operate, high yield, low raw material price, but high impurity content, low purity, poor quality, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/43C07C55/02
Inventor 刘其永廖金玉杨光耀李金海郝永军孙垂义刘隆新
Owner ZIBO GUANGTONG CHEM
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