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Clean production process of lactic acid

A clean production and process technology, which is applied in the separation/purification of carboxylic acid compounds, microorganisms, and microorganism-based methods, etc., can solve the problems of high material consumption and excessive discharge of waste water and waste, and achieve low material consumption, extremely low discharge, and improved quality. Effect

Active Publication Date: 2009-03-25
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a new process for the clean production of lactic acid in order to overcome the shortcomings of the existing lactic acid production method, such as excessive discharge of waste water and high material consumption.

Method used

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  • Clean production process of lactic acid

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Effect test

Embodiment 1

[0031] Attached figure 1 Shown, the realization steps of the present invention are as follows:

[0032] (1) Grinding corn and dissolving it in water by heating, removing solid particles with a drum filter, adding glucoamylase to the filtrate to prepare 10 L of saccharified solution with a glucose concentration of 15% by mass.

[0033] (2) Add the prepared saccharification solution into a fermenter, add 2% by mass percentage (dry weight) of soybean meal hydrolyzate and 7% of the volume of saccharification solution Lactobacillus delbrueckii, ferment at a temperature of 45°C, and adopt automatic control The mode of continuously adding the sodium hydroxide solution that mass percent concentration is 20% adjusts the pH value of the system, makes pH maintain at 6.8.

[0034] (3) When the mass percentage concentration of sugar content in the fermentation system is lower than 0.5%, the fermentation liquid is pumped into the ceramic membrane unit, the pore diameter of the ceramic memb...

Embodiment 2

[0039] Attached figure 1 Shown, the realization steps of the present invention are as follows:

[0040] (1) Grinding corn and dissolving it in water by heating, removing solid particles with a rotary drum filter, adding glucoamylase to the filtrate to prepare 10 L of saccharification solution with a concentration of 20% by mass.

[0041] (2) Add the prepared saccharified liquid into a fermenter, add 3% corn steep liquor by mass percentage (dry weight) and Lactobacillus delbrueckii with 8% saccharified liquid volume, ferment at a temperature of 50°C, and adopt self-controlled The method is to continuously add potassium hydroxide solution with a mass percent concentration of 30% to adjust the pH of the system, so that the pH is maintained at 6.8.

[0042] (3) When the sugar content mass percentage concentration in the fermentation system is lower than 1%, the fermentation liquid is pumped into the stainless steel membrane filtration unit, the aperture of the stainless steel mem...

Embodiment 3

[0047] Attached figure 1 Shown, the realization steps of the present invention are as follows:

[0048] (1) Grinding corn and dissolving it in water by heating, removing solid particles with a rotary drum filter, adding glucoamylase to the filtrate to prepare 10 L of saccharified solution with a concentration of 10% by mass.

[0049] (2) Add the prepared saccharification liquid into a fermenter, add corn steep liquor and bran of 5% by mass percentage (dry weight) and Lactobacillus delbrueckii with a volume of 12% of the saccharification liquid, ferment at a temperature of 48°C, and use The method of self-control control continuously adds sodium hydroxide solution with a mass percent concentration of 15% to adjust the pH of the system, so that the pH is maintained at 6.8.

[0050] (3) When the sugar content mass percentage concentration in the fermentation system is lower than 1%, the fermentation liquid is pumped into the PVC microfiltration membrane filtration unit, the pore...

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Abstract

The invention relates to a new clean production technique of lactic acid; the concrete steps of the technique comprise: firstly, saccharification solution made from substances containing sugar is added with nutritious substances and lactobacillus for fermentation; then a porous membrane is used for fining fermentation solution, and the lactobacillus in the solution is retained and returned to a fermentation unit for reuse; nanofiltration is adopted to carry out discoloration and purification to the penetrate solution of the porous membrane, and concentrated solution after nanofiltration is returned to the fermentation unit after being processed by a ceramic membrane sterilization system; the penetrate solution after nanofiltration enters a bipolar membrane electrodialysis system for preparing the lactic acid and liquid caustic produced simultaneously is returned for use; and finally, vacuum distillation is adopted to concentrate lactic acid solution, thus obtaining the lactic acid which is a finished product. The production technique is characterized by little pollution and low material consumption, realizes bacteria recycling fermentation, saves inoculation quantity, lowers fermentation cost as well as greatly reduces fermentation water consumption and improves the quality of lactic acid products.

Description

technical field [0001] The invention relates to a new clean production process of lactic acid, in particular to a lactic acid production process which adopts a membrane integration process to extract lactic acid and realize the recycling of fermentation cells and fermentation water. Background technique [0002] Lactic acid is widely used in chemical, food and pharmaceutical industries. In particular, polylactic acid will become an important substitute product for petrochemical resources. With the improvement of living standards, people have a greater demand for resources, such as packaging materials (food boxes, food bags, agricultural plastics, etc.). According to statistics, the world's plastic and chemical fiber production has reached more than 32 million tons per year, but oil resources will gradually be exhausted, and some new renewable resources will be the main substitute products, polylactic acid is one of them. At present, polylactic acid products (lunch boxes, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/56C12R1/225
CPCC12N1/22B01D61/58B01D61/027B01D61/422C07C51/44C12P7/56B01D61/445C07C59/08
Inventor 李卫星邢卫红范益群徐南平
Owner NANJING TECH UNIV
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