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Coupling method for converting lactic acid from water-containing raw material of lactate and extracting lactic acid

A lactate and raw material technology, applied in the production and conversion of lactic acid, can solve the problems of low conversion rate, solid waste conversion conditions, harsh conditions, etc., and achieve high conversion rate, low operating pressure and mild reaction conditions.

Active Publication Date: 2021-05-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] In order to solve the problems of low conversion rate, pollution such as solid waste generation and harsh conversion conditions in the conversion and extraction of lactic acid in the post-treatment process of the lactic acid salt solution in the prior art, especially the fermentation liquid after lactic acid fermentation, the present invention provides The method of coupling the conversion and extraction of lactic acid in the aqueous raw material of acid salt, realizes the conversion and extraction of lactic acid at the same time under relatively mild conditions, and has a high conversion rate

Method used

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  • Coupling method for converting lactic acid from water-containing raw material of lactate and extracting lactic acid

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Embodiment 1

[0029] Get the aqueous feed liquid 100g that contains calcium lactate through sterilizing treatment and add reactor, wherein the massfraction of lactate radical in aqueous feed liquid is 12%, to wherein adding organic solvent methyl isobutyl ketone 400g, then to reactor Carbon dioxide was filled in the medium and the pressure was increased to 8MPa, the temperature was raised to 50°C, and the reaction was fully stirred at constant temperature and pressure for 1.5h. After the reaction, the reaction liquid is left to stand and stratified, and the organic phase is transferred to the buffer tank that is pre-pressurized to the same pressure as the reactor through the side line pipeline at the height of the phase interface of the reactor, so as to realize the liquid separation of the inorganic phase, and then reduce the temperature and pressure , carbon dioxide is recovered, and lactic acid is dissolved in the organic phase. Then, the lactic acid is separated by the method of aqueous...

Embodiment 2

[0031] Except changing reaction temperature into 60 ℃, other conditions are identical with embodiment 1.

Embodiment 3

[0033] Except changing reaction temperature into 32 ℃, other conditions are identical with embodiment 1.

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Abstract

The invention relates to a coupling method for converting lactic acid from a water-containing raw material of lactate and extracting lactic acid, which comprises the following steps: mixing the water-containing raw material of lactate with an organic solvent, continuously introducing carbon dioxide into the mixed solution, reacting under the conditions that the pressure is greater than or equal to 7MPa and the temperature is greater than or equal to 30 DEG C, and separating an organic phase and a water phase after the reaction is finished, wherein the organic phase contains lactic acid; and the organic solvent is an organic solvent which can dissolve lactic acid but is not completely soluble with water, and is selected from at least one of esters, ethers and ketones of which the C atom number is greater than or equal to 5. According to the invention, lactic acid conversion and extraction can be carried out on the water-containing raw material at the same time, compared with a traditional sulfuric acid acidification method, carbon dioxide is used for replacing sulfuric acid to serve as an acidifying agent, calcium sulfate solid waste is not generated, and the method is a green and pollution-free separation method.

Description

technical field [0001] The invention relates to the production and conversion of lactic acid, mainly a method of coupling conversion and extraction of lactic acid from a lactate water-containing raw material. Background technique [0002] Lactic acid is widely used in food, medicine, chemical industry, new materials and other fields, such as flavoring agents, preservatives, preservatives, etc. in the food industry, as cosolvents, prodrug preparations, carrier agents, 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". At present, most industries use biological fermentation to produce lactic acid. The lactic acid fermentation liquid is a system with very complex components. In addition to lactic acid or lactate, there are also a large amount of bacteria, protein,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/08C07C51/48C07C51/02
CPCC07C51/02C07C51/48C07C59/08
Inventor 朱化雷高大成孙启梅王鹏翔
Owner CHINA PETROLEUM & CHEM CORP
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