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Method for producing 1,3-propylene glycol through ferment in high cell density by using bacteria in intestinal tract

A technology of Klebsiella and propylene glycol, applied in the field 1, can solve the problems of affecting the metabolic reaction rate, slow growth of bacteria, shortening the production cycle, etc., and achieve the effect of simple and economical process, short process cycle, and shortened fermentation cycle

Inactive Publication Date: 2007-08-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When considering how to increase the conversion rate of glycerol in the fermentation process reported in the literature, anaerobic conversion is generally used in the fermentation process. There is a growth stagnation period in anaerobic fermentation, and the growth of bacteria is slow, resulting in low biomass during fermentation and affecting metabolic reactions. Therefore, it is very important to increase the biomass in the fermentation process and adopt high cell density fermentation to increase the production intensity and shorten the production cycle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Bacterial species: Klebsiella pneumoniae (Klebsiella pneumoniae) seed culture solution (mass concentration, g / L): glycerol 10, glucose 10, K 2 HPO 4 ·3H 2 O, 3.4, NH 4 Cl2.0, yeast extract 3.0, MgSO 4 ·7H 2 O 0.2, CaCO 3 2.0, iron solution 1mL / L, trace element solution 2mL / L.

[0041] Fermentation medium (mass concentration, g / L): glycerol 2.0, K 2 HPO 4 ·3H 2 O 1.36, NH 4 Cl 5.4, yeast extract 1.0, MgSO 4 ·7H 2 O 0.2, CaCl 2 2.0 iron solution 1mL / L, trace element solution 2mL / L, V B12 Solution 1mL / L, cobalt solution 1mL / L. Trace elements containing: CuCl 2 , H 3 BO 3 , MnCl 2 , Na 2 MoO 4 , NiCl 2 , ZnSO4, the content of trace elements is about 0.01~50mg / L.

[0042] Seed liquid culture process: After 24 hours of activation of the slant bacteria, inoculate into a 500mL Erlenmeyer flask filled with 150mL sterile seed culture liquid, and carry out aerobic seed culture on a shaker at 37°C and 180r / min until the cell density reaches OD 650 ≥4.0

[0...

Embodiment 2

[0050] Using the same seeds and fermentation medium, and the same nutrient matrix fed-batch process, in the late stage of batch fermentation, the methods of reducing ventilation, maintaining pressure, and nitrogen gas were adopted respectively. The obtained results are as follows:

[0051] The influence of table 2 aeration control on fermentation result

[0052] Cell density

Spend

OD 650

fermentation

cycle

Glycerin

residual

1,3-Propane

alcohol concentration

Moore turns

conversion rate

specific production rate

reduce pass

capacity

7.4

27hr

<0.1%

47g / L

58.3%

1.74g / (L·h)

Upper holding pressure

6.8

31hr

<0.1%

48g / L

59.6%

1.55g / (L·h)

Nitrogen

6.8

29hr

<0.1%

51g / L

63.3%

1.76g / (L·h)

[0053] It can be concluded that nutrient-limited feeding and oxygen segmental regula...

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PUM

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Abstract

A method of preparing 1, 3- propylene glycol by high cell density intestinal uses the method of fermentation. Its process: seed culturing the intestinal bacterium is activated and then inoculated in the nutrient solution with no bacterium seed; the raises process of fermentation nutrient solution: when this solution is disinfected and cool, we inoculate the seed solution with the volume rate 3-15% into a tank of fermentation solution; the fast grow period of separated fermentation solution: the density of carbon retains 0.1-30g / L; high cell density fermentation period: the density of the bacterium seed reaches OD6502.0-5.0; it adapts the way of limited accommodate of alimentation and air; when the product has been synthesized, we add nitrogen, phosphate, inorganic ion, trace element,VB12 or their mixture of one or several components, and simultaneously add flowing glycerin; when there is acid, the fermentation process finishes.

Description

technical field [0001] The invention relates to a method for preparing 1,3-propanediol through biological fermentation, which belongs to the technical field of biocatalytic synthesis of 1,3-propanediol. Background technique [0002] 1,3-Propanediol is an important raw material and intermediate in organic synthesis and has a wide range of applications. 1,3-propanediol can be used in the synthesis of plasticizers, detergents, preservatives, emulsifiers; it is also used in food, cosmetics and pharmaceutical industries. It can react with isocyanate to produce polyurethane, which is an important monomer for the production of polyurethane; especially 1,3-propanediol can react with terephthalic acid to polymerize into PTT polyester fiber. This new polyester material not only has the characteristics of easy natural circulation Biodegradable, and has excellent resilience, dyeability, stain resistance, etc. It has great achievements in application fields such as carpets, engineering...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/18C12R1/22
Inventor 吴敏马全红
Owner SOUTHEAST UNIV
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