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Extraction method of mixed long-chain dicarboxylic acid and mixed long-chain dicarboxylic acid

A long-chain dibasic acid and extraction method technology, which is applied in the field of extraction of mixed long-chain dibasic acids, can solve the problems of ineffective removal of pigments and impurities, low yield of dibasic acid loss, complicated solvent recovery, etc., and achieve quality Good, cost saving, light color effect

Pending Publication Date: 2020-08-28
CATHAY R&D CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: the process requires two or more decolorization of activated carbon, resulting in a large loss of dibasic acid and low yield
Chinese patent application CN102795984A uses ethanol to refine the reorganization of dodecane dibasic acid into raw materials and react with excess liquid caustic soda to generate long carbon chain dibasic acid. This process has the defect of dibasic acid and ethanol esterification caused by ethanol process, and Decolorization with activated carbon alone cannot effectively remove pigments and impurities, the product has poor appearance, and the recovery of solvents is also relatively complicated

Method used

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  • Extraction method of mixed long-chain dicarboxylic acid and mixed long-chain dicarboxylic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Electrodialysis unit, comprising: anode 11, cathode 12, bipolar membrane 21, bipolar membrane 22, positive membrane 31, negative membrane 32, pole chamber 51, pole chamber 52, positive membrane 31 and negative membrane 32 are located on bipolar membrane 21 , bipolar membranes 22 and alternately arranged to form concentration chambers and desalination chambers, the concentration chambers and desalination chambers are alternately arranged, followed by concentration chambers 41, desalination chambers 42, concentration chambers 43, desalination chambers 44, and concentration chambers 45. In this embodiment, there is no limit to the number of electrodialysis units in the electrodialysis device.

Embodiment 2

[0086] A method for extracting mixed long-chain dibasic acids, comprising the following steps:

[0087] (1) Convert DC 12 (i.e. dodecanedioic acid, the structural formula is HOOC(CH 2 ) 10 COOH) fermented liquid extracts and refines DC 12 Add the mixture containing long-chain dibasic acid discharged in the process into water, adjust the pH value with aqueous sodium hydroxide solution, stir to dissolve the mixture containing long-chain dibasic acid, the pH value at the end of the dissolution is 10, and pass through the ceramic membrane at 80°C , obtain the mixed long-chain dibasic acid salt solution to be refined (long-chain dibasic acid radical content is 5.8wt%, wherein the content of dodecanoic dibasic acid radical is 4.13wt%, other is DC 10 -DC 16 of dibasic acid radicals).

[0088] (2) make the mixed long-chain dibasic acid salt solution to be refined that step (1) obtains, carry out electrodialysis treatment through the electrodialysis unit that 50 electrodialysis un...

Embodiment 3

[0094] It is basically the same as Embodiment 2, except that in Embodiment 3, the reaction is terminated when the conductivity of the solution in the desalination chamber 44 is below 300 μS / cm.

[0095] The long-chain dibasic acid root yield in the purified mixed long-chain dibasic acid salt solution is 99.1%, and the decolorization rate of the solution is 81.5%. The color of the mixed long-chain dibasic acid product in Example 3 is light yellow.

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Abstract

The invention discloses an extraction method of mixed long-chain dicarboxylic acid and the mixed long-chain dicarboxylic acid. The extraction method of the mixed long-chain dicarboxylic acid comprisesthe step of carrying out electrodialysis on a to-be-refined mixed long-chain dicarboxylic acid salt solution through an electrodialysis device to obtain a purified mixed long-chain dicarboxylic acidsalt solution. The extraction method provided by the invention effectively solves the problem of extraction and purification of a mixture containing long-chain dicarboxylic acid discharged in the process of extracting and refining the long-chain dicarboxylic acid by fermentation liquor of the long-chain dicarboxylic acid. A high-quality mixed long-chain dicarboxylic acid finished product is obtained, and the product is light in color and good in quality. Wide application prospects are realized in the fields of plasticizers, lubricating agents, antirust agents and the like. Alkali liquor and acid liquor obtained from the concentration chamber after electrodialysis can be applied to the next mixed dibasic acid extraction process and used for pH adjustment in the mixed dibasic acid dissolution and precipitation process, and thus cyclic utilization of atoms is achieved.

Description

technical field [0001] The invention relates to a method for extracting mixed long-chain dibasic acids. Background technique [0002] Long chain dicarboxylic acids (Long chain dicarboxylic acids) refer to aliphatic dicarboxylic acids with more than 10 carbon atoms in the carbon chain (DCn for short, n≥10). Including saturated and unsaturated dicarboxylic acids, it is a class of fine chemical products with important and extensive industrial uses. It is used in the synthesis of high-grade spices, high-performance nylon engineering plastics, high-grade nylon hot-melt adhesives, high-temperature dielectrics, advanced paints and coatings in the chemical industry. , high-grade lubricants, cold-resistant plasticizers, resins, important basic raw materials for medicines and pesticides, etc. Due to the broad development potential of the downstream products of long-chain dibasic acids, the demand for long-chain dibasic acids at home and abroad will continue to increase, and its marke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42C07C55/21C07C55/02
CPCC07C51/42C07C55/21C07C55/02
Inventor 董筱雯杨晨秦兵兵刘修才
Owner CATHAY R&D CENT CO LTD
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