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A coupled adsorbent for extracting l-lactic acid from lactic acid acid hydrolysis

An acid hydrolyzate and adsorbent technology, applied in the field of L-lactic acid extraction, can solve the problems of long process flow, large discharge of waste water and waste residue, and high production cost

Active Publication Date: 2016-08-10
河南金丹乳酸科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A coupled adsorbent for extracting l-lactic acid from lactic acid acid hydrolysis
  • A coupled adsorbent for extracting l-lactic acid from lactic acid acid hydrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, the coupling adsorbent for extracting L-lactic acid from lactic acid acid hydrolysis solution consists of 20 kg of coupling agent, 100 kg of loading solvent and 5 kg of coupling accelerator. The coupling agent is dimethylsiloxane, the loading solvent is kerosene, and the coupling accelerator is soybean lecithin.

[0024] 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 80.2wt% of L-lactic acid in the lactic acid acid hydrolysis solution was extracted by the coupled adsorbent.

Embodiment 2

[0026] In this embodiment, the coupling adsorbent for extracting L-lactic acid from lactic acid acid hydrolyzate consists 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.

[0027] 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.

Embodiment 3

[0029] In this embodiment, the coupling adsorbent for extracting L-lactic acid from lactic acid acid hydrolyzate consists 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.

[0030] The dimethylsiloxane with hydroxyl is shown in formula (I):

[0031] Formula (I);

[0032] 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.

[0033] 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 aqueou...

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Abstract

The invention discloses a coupling adsorbent for extracting an L-lactic acid from a lactic acid acidolysis solution. The coupling adsorbent is prepared from a coupling agent, a load solvent and a coupling promoter at the mass ratio of (20-35) to 100 to (5-15). According to the coupling adsorbent, the L-lactic acid can be extracted from a lactic acid acidolysis solution; an existing process route for gradually separating various kinds of impurities from the L-lactic acid is changed; the L-lactic acid is directly adsorbed by the coupling adsorbent; and various kinds of impurities are left in the residual solution. The coupling adsorbent disclosed by the invention has specific adsorbability on the L-lactic acid; the target of purifying the L-lactic acid in one step is achieved; and a decoloring technology and most of hybridization technologies in an existing technology 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 Patents(China)
IPC IPC(8): B01J20/22C07C59/08C07C51/47
CPCB01J20/22B01J20/26B01J20/261B01J2220/445C07C51/47C07C59/08
Inventor 任秀莲文倩魏崎峰穆鹏宇陈泳兴刘腾阳郭敬敬刘清瑞王晓飞朱守林王敏韩英杰李冰马凯歌郭廷王然明王俊丽王新顾永华申介建王浩张树银邢涛毛鸿涛普峰徐向阳代陶张美霞张国宣刘雁楚慧玲姜建友李义生
Owner 河南金丹乳酸科技股份有限公司
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