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A method for coupled transformation and extraction of lactic acid from aqueous feedstock of lactate

A lactate and raw material technology, applied in the field of coupled conversion and extraction of lactic acid, can solve the problems of low conversion rate, harsh conversion conditions, and solid waste generation, achieve high conversion rate, simplify post-treatment process, and avoid pollution

Active Publication Date: 2022-06-07
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problem of low conversion rate, solid waste and other pollution in the conversion and extraction of lactic acid in the aqueous lactate solution, especially the post-treatment process of the fermentation broth after lactic acid fermentation, it can only be applied to calcium lactate feed liquid and conversion To solve problems such as harsh conditions, the present invention provides a method for coupling the conversion and extraction of lactic acid from the aqueous raw material of lactate, and realizes the conversion and extraction of lactic acid simultaneously under relatively mild conditions, and has a higher conversion rate

Method used

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  • A method for coupled transformation and extraction of lactic acid from aqueous feedstock of lactate
  • A method for coupled transformation and extraction of lactic acid from aqueous feedstock of lactate
  • A method for coupled transformation and extraction of lactic acid from aqueous feedstock of lactate

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Embodiment 1

[0031] The sodium lactate fermentation broth was treated by sterilization, decolorization and ultrafiltration, wherein the mass fraction of lactate in the aqueous feed liquid was 12%. The content of impurities in the treated sodium lactate fermentation broth is shown in Table 1.

[0032] Table 1.

[0033]

[0034] Get the above-mentioned treated sodium lactate fermentation liquid 100g and add it to the reactor, then add 48g of solid adsorbent PVP resin (in terms of the dry basis weight of the resin), that is, 4 times the weight of lactate in the feed liquid, then fill the reactor with Carbon dioxide and pressurized to 8.0MPa, control the temperature to 10 ℃, maintain constant temperature and pressure to fully stir the reaction for 2h. After that, the feed liquid was discharged to the buffer tank, depressurized and recovered carbon dioxide, washed the solid adsorbent with a sufficient amount of 5 ℃ pure water, retained the washing liquid, and measured the residual lactic ac...

Embodiment 2

[0036] Other conditions were the same as in Example 1, except that the solid adsorbent was replaced with an equal weight of D301 resin.

Embodiment 3

[0038] Other conditions were the same as in Example 1, except that the solid adsorbent was replaced with an equal weight of DR2 resin.

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Abstract

A coupled method for converting lactic acid and extracting lactic acid from the aqueous raw material of lactate, mixing the aqueous raw material of lactate with a solid adsorbent, and then continuously feeding carbon dioxide into it, keeping the pressure ≥ 5MPa, and the temperature 5~30 °C reaction, after the completion of the separation of the solid adsorbent and the feed liquid, the solid adsorbent is eluted with water to obtain lactic acid; the solid adsorbent is capable of selectively adsorbing organic acids but not inorganic ions, and can desorb after heating up. Adsorbed resins. The present invention selects the combination of solid adsorbent capable of absorbing lactic acid and carbon dioxide high-pressure treatment, which can convert and extract lactic acid from water-containing raw materials at the same time. Compared with the traditional calcium salt sulfuric acid acidification method, carbon dioxide is used instead of sulfuric acid as the acidifying agent , does not produce calcium sulfate solid waste, is a green and pollution-free separation method.

Description

technical field [0001] The present invention relates to the production and transformation of lactic acid, mainly a method for coupled transformation and extraction of lactic acid from a lactic acid salt aqueous solution. Background technique [0002] Lactic acid is one of the three recognized organic acids and is widely used in food, medicine, chemical industry, new materials and other fields. It can be used to prepare chemical or biological materials such as lactate, propylene glycol, propylene oxide, acrylic acid and polylactic acid. At present, the biological fermentation method is mostly used in industry to produce lactic acid. The composition of lactic acid fermentation broth is very complex. In addition to lactic acid or lactate, there are a large number of bacterial cells, pigments, unconverted substrates, proteins, inorganic salts, by-product organic acids, etc. There are many kinds of impurities, which are lactic acid. Subsequent separation and purification brough...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/02C07C51/47C07C59/08C12P7/56
CPCC07C51/02C07C51/47C12P7/56C07C59/08Y02P20/151
Inventor 朱化雷高大成孙启梅王鹏翔
Owner CHINA PETROLEUM & CHEM CORP
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