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Acidifying, distilling and extracting method for natural propionic acid and acetic acid of propionic bacteria fermentation liquid

A technology of propionic acid bacteria fermentation liquid and distillation extraction, which is applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problem that the output cannot meet market demand, etc., and achieve low production cost and high product quality Good, simple process effect

Inactive Publication Date: 2007-01-31
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is only a small amount of propionic acid by-products in the process of preparing acetic acid from wood carbonization and oxidation of light hydrocarbons in China. The output is far from meeting the market demand, and a large number of them are imported every year.

Method used

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  • Acidifying, distilling and extracting method for natural propionic acid and acetic acid of propionic bacteria fermentation liquid
  • Acidifying, distilling and extracting method for natural propionic acid and acetic acid of propionic bacteria fermentation liquid
  • Acidifying, distilling and extracting method for natural propionic acid and acetic acid of propionic bacteria fermentation liquid

Examples

Experimental program
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Effect test

specific Embodiment 1

[0033] Propionic acid bacteria anaerobic fermentation of vitamin B 12 3 parts of production waste liquid, 400ml each, were adjusted to pH 3.5 with sulfuric acid, phosphoric acid and oxalic acid respectively, and after fully stirring, they were distilled under reduced pressure at 80°C, and the distillate was collected, and the total acidity was titrated with standard NaOH solution, and separated and determined by gas chromatography. , the content of acetic acid, the results are listed in Table 1.

[0034] Table 1 compares the mixed aqueous solution of propylene and acetic acid steamed out after acidifying with different acids

[0035] fermented liquid

[0036] From the above results, it can be seen that the acidity and yield of the mixed solution of propylene and acetic acid distilled from the direct acidification of the fermentation broth are relatively low, and the yield is directly proportional to the distilled volume.

Embodiment 2

[0038] Propionic acid bacteria anaerobic fermentation of vitamin B 12 Production waste liquid 800ml, is equally divided into four parts, with Ca(OH) 2 Adjust the pH to 8.0, 8.5, 9.0, and 9.5 in turn, filter to remove the precipitate, and concentrate the filtrate at 75-80°C to about half the volume, take it out and measure the pH, adjust the pH to 2.0 with sulfuric acid, Distill under reduced pressure to about 60% of distillate volume, measure the total acidity of distillate and measure propane, acetic acid content with gas chromatography, the results are listed in Table 2.

[0039] Fermentation filtrate (ml)

[0040] From the above results, it can be seen that the total acidity of the recovered mixture of propane and acetic acid is inversely proportional to the residual volume percentage of waste liquid concentration, and the yield is directly proportional to the volume percentage of distilled off. relation.

Embodiment 3

[0042] Take the propionic acid bacteria fermentation filtrate at pH 8.5, concentrate it under reduced pressure to about 50% of the volume, divide it into 4 parts, 80ml each, adjust pH 3.5, 3.0, 2.5 and 2.0 with sulfuric acid, and distill under reduced pressure at 70°C to distillate About 50% of the volume, measure the total acidity of the distillate and measure the content of propane and acetic acid with gas chromatography, the results are listed in table 3.

[0043] Volume of waste liquid concentrate (ml)

[0044] As can be seen from the data in Table 3, the total acidity of the propane and acetic acid mixed aqueous solution that reclaims rises with the reduction of acidification pH before distillation; rise.

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Abstract

The present invention belongs to the technology of evaporation and distillation treatment technology. The technological process includes the main steps of: acidifying the concentrated liquid with non-volatile acid via stirring to convert the salt of propionic acid and acetic acid into free acid; and decompression distillation to obtain distillate mixed water solution of propionic acid and acetic acid. It is preferably to perform alkali pre-treatment and decompression distillation before acidification. The present invention features that from the fermented propionic bacteria liquid, mixed water solution of propionic acid and acetic acid with high purity may be extracted, and the mixed water solution may be further produced into various side products. The present invention can reduce exhausted waste liquid and environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of evaporation and distillation treatment of industrial waste liquid. Background technique [0002] Our country uses the fermentation of propionic acid bacteria to produce vitamin B 12 In a large country, the fermentation production waste liquid contains volatile organic acids such as propionic acid and acetic acid, as well as a large amount of ammonium salt and protein. Untreated or insufficiently treated fermentation waste is discharged in large quantities, which not only pollutes the environment, but also wastes valuable resources. Only two factories in Shijiazhuang discharge as much as 550 tons of waste liquid every day. If this abundant resource can be recovered, the obtained natural acrylic acid, acetic acid and its salts will have a wide application market. [0003] In the food industry, propionic acid can be used as a preservative and flavor enhancer for beverages, soy sauce, cooking oil, cheese, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C53/122C07C51/44C07C51/487
Inventor 徐亲民赵平孙国志周晓辉边红杰梁焱常景立郑毓
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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