Preparation technology of propionic acid

Abstract

The invention belongs to the technical field of food additives, and relates to a preparation technology of propionic acid. The preparation technology specifically comprises the following steps of sterilizing, inoculating, saccharifying, fermenting, filtering, discoloring and rectifying in a rectification tank. The preparation technology is characterized in that starch and malt are used as raw materials, and are treated by the steps of high-temperature steam sterilizing, inoculating, saccharifying and fermenting, so as to produce a fermenting solution; the foreign odor gas produced in the fermenting process enters a foreign odor gas treatment system, the sterile air and an inorganic nitrogen source are supplemented in the fermenting process, and the fermenting solution is crystallized, filtered and rectified to extract 99% fermented propionic acid; the steam produced by rectifying is condensed for preparing a culture medium, and the rectified propionic acid is used for producing fermented calcium propionate by a calcium propionate production process. The preparation technology has the advantages that by setting the whole technology steps, the production efficiency and purity of propionic acid are improved, the production cost is reduced, and the preparation technology is suitable for being industrially popularized and applied.

Description

technical field [0001] The invention belongs to the technical field of food additives and relates to a preparation process of propionic acid. Background technique [0002] Propionic acid is an important chemical raw material. Propionic acid and its salts have important uses in food, medicine, cosmetics and other industries. The production methods of propionic acid include chemical synthesis and biological fermentation. Microorganisms can use a variety of fermentable sugars to produce propionic acid. In industry, various biomass can be hydrolyzed into simple sugars such as glucose or xylose with acid or enzyme, and then introduced into the reactor for fermentation. After the fermentation is completed, milk of lime is added. Precipitate, filter and add sodium sulfate for metathesis reaction, then filter and concentrate, add sulfuric acid for conversion and then carry out fractional distillation. The fermentation reactor can use immobilized protoplast tower reactor, and the ce...

AI Technical Summary

Problems solved by technology

Microorganisms can use a variety of fermentable sugars to produce propionic acid. In industry, various biomass can be hydrolyzed into simple sugars such as glucose or xylose with acid or enzyme, and then introduced into the reactor for fermentation. After the fermentation is completed, milk of lime is added. Precipitate, filter and add sodium sulfate for metathesis reaction, then filter and concentrate, add sulfuric acid for conversion and then carry out fractional distillation. The fermentation reactor can use immobilized protoplast tower reactor, and the cells are fixed in the following form: by immersion method Cover the surface of the pre-sterilized filling ring with a layer of sterilized solution containing 20% ​​gelatin and 1.5% shellac, and spray it with 2.5% glutaraldehyde aqueous solution after drying to cross-link the polymer on the surface of the filling ring , to increase the strength, rinse with sterile water, then sterilize with ethylene glycol, blow out ethylene glycol with sterilized nitrogen, and then add propionic acid bacteria culture solution to the reactor filled with this filled ring, so that It forms a layer of fixed cell membrane on the surface of the filling ring, and then can be continuously fed for fermentation, but the chemical synthesis method has heavy pollution, high cost, and harsh operating conditions. Therefore, the biological fermentation method has become an important way to prepare propionic acid. Among them, biological fermentation The selection of nitrogen source, pH value, and selection of raw materials in the method all have a greater impact on the production of propionic acid. With the improvement of human living standards, the importance of health is getting higher and higher, and the requirements for products are also increasing. More and more strict, the existing biological fermentation of propionic acid has problems such as low production efficiency, low purity and high cost. Therefore, it is very promising to design a production process for propionic acid with high production efficiency and low cost.

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