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Method for purifying long-chain diacid

A technology of long-chain dibasic acid and purification method, which is applied in the field of purifying long-chain dibasic acid, can solve the problems of hindering the production of long-chain dibasic acid, difficult to handle sodium sulfate solution, etc. The effect of acid-base depletion

Active Publication Date: 2019-09-24
CATHAY R&D CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method contains a ceramic membrane filtration process, but the process conditions have the following disadvantages: after the fermentation of long-chain dibasic acids, a large amount of caustic soda needs to be used to adjust the pH and form long-chain dibasic acid sodium salts
Sodium sulfate solution is difficult to deal with. The existing environmental protection regulations do not allow it to be discharged into nature. It can only be dried by evaporation to form a large amount of low-quality sodium sulfate solids, which are accumulated and stored.
This is a great hindrance to the production of long-chain dibasic acids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5 and comparative example 1

[0060] The preparation method of secondary seed liquid in following embodiment 1-5 and comparative example 1:

[0061] Prepare secondary seed liquid according to the method of patent ZL200410018255.7 embodiment 1:

[0062] 1) Take the glycerol tube strain of Candida tropicalis (CCTCC NO: M203052) and inoculate it into 500 mL seeds filled with 200 mL liquid medium (10 g / kg peptone, 5 g / kg yeast extract, 10 g / kg glucose, natural pH) Cultivate in the bottle at 35°C, 300rpm shaker for 10-15 hours;

[0063] 2) Take the above-mentioned shaking flask seeds, insert them into a 10L fermenter equipped with 5L seed medium (10g / kg peptone, 10g / kg yeast extract, 10g / kg glucose, natural pH), and cultivate them at 35°C for 24 hours to produce Get the first-grade seed liquid for subsequent use;

[0064] 3) With 16M 3 Medium 20M 3 In the fermenter, the above-mentioned first-level seed liquid is inserted, and the second-level seed tank cultivation is started. The fermentation medium formul...

Embodiment 1

[0073] installed in 100M 3 200M of medium 3 In the fermenter, the secondary seed liquid added to the seed liquid starts to ferment. The composition of the fermentation medium is: glucose 30g / L, KH 2 PO 4 5g / L, yeast extract 20g / L, corn steep liquor 15g / L, urea 2.5g / L, NaCl2.0g / L, KNO 3 7g / L, prepared with pure water, natural pH, sterilized at 121℃. Dissociation of C12 alkanes and fed sugars. Cultivate at 29°C under the conditions of ventilation rate 0.5vvm and tank pressure 1.0Mpa. 20 hours before fermentation, the pH was natural, and the growth of bacteria was the main factor. When the growth optical density (OD 620 ) greater than 0.6 (diluted 30 times), start to add C12 alkanes 8% in batch mode, and then add an alkane once every 8 hours to control the concentration of alkane in the fermentation broth to maintain about 5% (V: V, relative to the initial volume of fermentation), At the same time, adjust the pH to 6.5, 48-120 hours until the tank is released, and adjust ...

Embodiment 2

[0080] The method for preparing the long-chain dibasic acid is the same as that of Example 1, the difference is that: in the above process, the pH value is adjusted to 7.2 with ammonia water every 4 hours until 48-120 hours into the tank, and the fermented dodecane dibasic acid is obtained. Liquid 1000L, wherein dibasic acid content 153g / L.

[0081] Add water to the above fermentation broth to adjust the mass concentration of the dibasic acid to 10.5%, adjust the pH to 8.5 with ammonia gas, heat to 60° C., and filter through a ceramic membrane with a pore size of 0.1 micron. The area of ​​the ceramic membrane used is 0.84 square meters, the pressure in front of the membrane is set at 0.4MPa, and the membrane liquid is received.

[0082] The received membrane serum was decolorized by adding 5wt% powdered activated carbon (relative to the amount of long-chain dibasic acid contained in the solution) at 60° C., and filtered to obtain a clear liquid. The received clarified liquid ...

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Abstract

A method for purifying a long-chain diacid comprises the following steps: controlling the pH value of a long-chain diacid fermentation liquid to be 7.0 or above by using ammonia water, liquid ammonia or ammonia gas during or after fermentation in order to obtain a fermentation liquid containing long-chain diacid ammonium salt, performing membrane filtration, heating the filtered fermentation liquid, carrying out solid-liquid separation, and extracting the long-chain diacid. The method effectively reduces the content of inorganic salts in the fermentation liquid under the premise of maintaining the high yield of long-chain dibacid product, so the sewage treatment pressure is greatly reduced.

Description

technical field [0001] The present invention relates to a method for treating long-chain dibasic acids. In particular, the present invention relates to a method for purifying long-chain dibasic acids. Background technique [0002] Long-chain dibasic acids are the basic monomer raw materials for a series of synthetic materials. Long-chain dibasic acids and their derived monomers can be used to produce nylon, polycarbonate, powder coatings, spices, hot melt adhesives, special lubricants, etc. It is an important raw material for synthetic spices, engineering plastics, cold-resistant plasticizers, high-grade lubricants and polyamide hot-melt adhesives. [0003] During the preparation of long-chain dibasic acids, long-chain dibasic acid salts are usually formed first in the reaction solution, and a series of treatments need to be performed on the reaction solution containing long-chain dibasic acid salts to obtain long-chain dibasic acid products . [0004] In the process of p...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C51/50C07C51/47C07C55/02C07C55/21C07C57/13
CPCC07C51/42C07C51/50C07C51/47C07C55/02C07C55/21C07C57/13
Inventor 秦兵兵李乃强杨晨徐敏郝英利刘修才
Owner CATHAY R&D CENT CO LTD
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