Method for extracting and separating L-lactic acid from ammonium lactate fermentation material liquid

A fermentation material and ammonium lactate technology, applied in the separation/purification of carboxylic acid compounds, carboxylate preparation, organic chemistry, etc., can solve the problems of high energy consumption, large discharge of waste water and waste residue, and low yield

Active Publication Date: 2015-04-29
河南金丹乳酸科技股份有限公司
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Problems solved by technology

[0003] At present, the main problems in the existing production process of L-lactic acid at home and abroad are: 1. Low yield, high energy consumption and high production cost
2. The process is complicated and the process is long
3. Large discharge of waste water and waste residue

Method used

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  • Method for extracting and separating L-lactic acid from ammonium lactate fermentation material liquid
  • Method for extracting and separating L-lactic acid from ammonium lactate fermentation material liquid
  • Method for extracting and separating L-lactic acid from ammonium lactate fermentation material liquid

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Effect test

Embodiment 1

[0034] In this embodiment, the method for extracting and separating L-lactic acid from the ammonium lactate fermentation feed liquid comprises the following steps:

[0035] (1) Pretreatment of ammonium lactate fermentation feed liquid: use membrane filtration or centrifuge to pretreat the ammonium lactate fermentation feed liquid, remove the bacteria and nutrients in the fermentation feed liquid, and return the separated bacteria and nutrients to lactic acid The fermentation process continues to participate in the fermentation to realize the recycling of bacteria.

[0036] (2) Sulfuric acid acidolysis of ammonium lactate: join the sulfuric acid solution that mass fraction is 96% in the ammonium lactate fermentation feed liquid that obtains after pretreatment, make the pH=1.5 of feed liquid acidolysis end point, and concentrate or add water to dilute, Make the mass fraction of L-lactic acid in the acidolysis feed solution be 25%.

[0037] (3) Add the acidolysis feed liquid and...

Embodiment 2

[0044] The difference between this embodiment and Embodiment 1 is that the coupling adsorbent is composed of 25 kg of coupling agent, 100 kg of loading solvent and 8 kg of coupling accelerator. The coupling agent is polydimethylsiloxane, the loading solvent is oleyl alcohol, and the coupling accelerator is soybean lecithin.

[0045] At 24 degrees Celsius, the coupling adsorbent of this embodiment and the lactic acid acid hydrolysis solution with a mass fraction of L-lactic acid of 25% were added to the centrifugal extractor respectively, and the mass ratio of the coupling adsorbent to the lactic acid acid hydrolysis solution was 1: 3. The aqueous phase and the organic phase are separated, and the mass percentage content of L-lactic acid in the aqueous phase is detected. The results showed that 82.1wt% of L-lactic acid in the lactic acid acid hydrolysis solution was extracted by the coupled adsorbent.

[0046]After reverse-coupling adsorption separation of L-lactic acid in th...

Embodiment 3

[0048] The difference between this embodiment and Embodiment 1 is that the coupling adsorbent is composed of 35 kg of coupling agent, 100 kg of loading solvent and 15 kg of coupling accelerator. The coupling agent is dimethylsiloxane with hydroxyl groups.

[0049] The dimethylsiloxane with hydroxyl is shown in formula (I):

[0050]

[0051] In formula (I): R3 and R4 are both CH 3 O-, R1 is CH 3 -, R2 is HOCH 2 CH 2 CH 2 -. The loading solvent is methyl acetate, and the coupling accelerator is soybean lecithin.

[0052] At 24 degrees Celsius, the coupling adsorbent of this embodiment and the lactic acid acid hydrolysis solution with a mass fraction of L-lactic acid of 25% were added to the centrifugal extractor respectively, and the mass ratio of the coupling adsorbent to the lactic acid acid hydrolysis solution was 1: 3. The aqueous phase and the organic phase are separated, and the mass percentage content of L-lactic acid in the aqueous phase is detected. The resu...

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Abstract

The invention discloses a method for extracting and separating L-lactic acid from an ammonium lactate fermentation material liquid. The method comprises the following steps: (1) pre-treating the ammonium lactate fermentation material liquid; (2) carrying out sulphuric acidolysis on ammonium lactate; (3) adding an acidolysis material liquid and a coupling adsorbent in a centrifugal extractor respectively, and extracting L-lactic acid through coupling adsorption at 15-25 DEG C; (4) separating an organic phase from a water phase; and (5) adding the organic phase and hot water at 55-65 DEG C in the centrifugal extractor respectively, and extracting L-lactic acid through backcoupling adsorption. The method disclosed by the invention is capable of rapidly extracting and separating L-lactic acid from the lactic acid acidolysis liquid, changing the process route of separating various impurities from L-lactic acid one by one, and directly separating L-lactic acid through coupling adsorption by virtue of a coupling adsorption agent so as to leave the various impurities in a raffinate; because the coupling adsorption agent in the method disclosed by the invention has a specific adsorption property on L-lactic acid, the purpose of further purifying L-lactic acid is achieved, and a decolouring process and most of hybridization processes in the existing processes are removed.

Description

technical field [0001] The invention relates to a technology for extracting L-lactic acid in lactic acid industrial production, in particular to a coupling adsorbent for extracting L-lactic acid from lactic acid acidification liquid. Background technique [0002] L-lactic acid is widely used in food, medicine, chemical industry, new materials and other fields, such as flavoring agent, preservative, preservative in the food industry, and co-solvent, prodrug preparation, carrier agent, etc. in the pharmaceutical industry. Polylactic acid (PLA), synthesized from lactic acid as a monomer, is a bio-based degradable new material supported by the state, which can replace petrochemical-based plastic products and eliminate environmental "white pollution". [0003] At present, the main problems existing in the existing production process of L-lactic acid at home and abroad are: 1. Low yield, high energy consumption and high production cost. 2. The process is complicated and the proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/08C07C51/02C07C51/42
CPCC07C51/02C07C51/42C07C51/47C07C51/48C07C59/08
Inventor 石从亮穆鹏宇文倩廉洁刘腾阳李宁伍东方张鹏于培星崔耀军王然明王俊丽王宏林韩英杰徐向阳顾永华师媛媛刘清瑞朱守林王敏张云飞胡中华王浩张国宣杨淑霞张树银张亚辉邢晓霞
Owner 河南金丹乳酸科技股份有限公司
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