Calcium salt method-electrodialysis coupling technology-based lactic acid cleaner production method

A technology of clean production and electrodialysis, applied in the direction of microorganism-based methods, biochemical equipment and methods, separation/purification of carboxylic acid compounds, etc., to achieve the effect of closed-circuit recycling

Inactive Publication Date: 2011-11-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method requires that NaOH solution is used to adjust the pH of fermentation during fermentation. However, due to the performance problems of lactic acid fermentation strains, the concentration of lactic acid fermen

Method used

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  • Calcium salt method-electrodialysis coupling technology-based lactic acid cleaner production method
  • Calcium salt method-electrodialysis coupling technology-based lactic acid cleaner production method
  • Calcium salt method-electrodialysis coupling technology-based lactic acid cleaner production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Step 1) Preparation of lactic acid fermentation broth:

[0083] The microorganism strain used was Lactobacillus paracasei (Lactobacillus paracasei, NERCB0401 (Industrial Microorganisms, 2007, Vol. 37, Issue 4, 1-5)), and the above-mentioned strains were used for fed-batch fermentation. There are two kinds of media used:

[0084] (1) Seed culture medium: glucose 40g / L, peptone 10g / L, beef extract 10g / L, yeast powder 5g / L, diammonium hydrogen citrate 2g / L, sodium acetate 5g / L, dipotassium hydrogen phosphate 2g / L, Tween 801mL / L, magnesium sulfate 0.6g / L, manganese sulfate 0.25g / L.

[0085] (2) Fermentation medium: glucose 60g / L, peptone 10g / L, beef extract 6g / L, yeast powder 10g / L, sodium chloride 0.03g / L, ferrous sulfate 0.01g / L, sodium acetate 4g / L , Citrate diamine 2g / L, potassium dihydrogen phosphate 2g / L, Tween-801mL / L, magnesium sulfate 0.2g / L, manganese sulfate 0.2g / L.

[0086] Two kinds of media were prepared according to the above formula, sterilized at 121°C for 15 mi...

Embodiment 2

[0094] Step 1) Preparation of lactic acid fermentation broth: same as step 1) of Example 1, to obtain about 3.4 liters of calcium lactate-containing fermentation broth with a lactic acid concentration of 160 g / L.

[0095] Sterilization: pass the fermentation broth obtained in step 1) through a 0.2 μm microfiltration membrane of Tianjin Membrane Engineering Technology Co., Ltd. to obtain 3 liters of fermentation broth with a lactic acid concentration of about 160 g / L.

[0096] Step 2) Precipitation replacement: Add 5.1 mol / L of sodium carbonate solution to the sterilized fermentation broth with a volume ratio of about 5:1, stir and mix thoroughly to make the reaction complete; filter to obtain solid calcium carbonate and lactic acid concentration of 134g / The fermentation broth containing sodium lactate is about 3.5L.

[0097] Step 3) Bipolar membrane electrodialysis regenerates acid and alkali from fermentation broth containing sodium lactate:

[0098] The bipolar membrane electrodial...

Embodiment 3

[0101] Step 1) Preparation of lactic acid fermentation broth: same as step 1) of Example 1, to obtain about 3.4 liters of calcium lactate-containing fermentation broth with a lactic acid concentration of 164 g / L.

[0102] Sterilization: Pass the fermentation broth obtained in step 1) through a 0.2 μm microfiltration membrane of Tianjin Membrane Engineering Technology Co., Ltd. to obtain about 3.0 liters of fermentation broth with a lactic acid concentration of about 164 g / L.

[0103] Step 2) Precipitation replacement: Add 5.0 mol / L potassium carbonate solution to the sterilized fermentation broth with a volume ratio of about 4.98:1, stir and mix thoroughly to make the reaction complete; filter to obtain solid calcium carbonate and lactic acid concentration of 137g / The fermentation broth containing potassium lactate of L is about 3.6L.

[0104] Step 3) Bipolar membrane electrodialysis regenerates acid and alkali from fermentation broth containing potassium lactate:

[0105] The bipola...

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Abstract

The invention relates to a calcium salt method-electrodialysis coupling technology-based lactic acid cleaner production method. The method comprises the following steps that 1, the pH value of fermentation broth is still adjusted through CaCO3 in a lactic acid fermentation stage; 2, calcium lactate-containing lactic acid fermentation broth and ammonium carbonate, sodium carbonate or potassium carbonate undergo a precipitation displacement reaction to form fermentation broth containing ammonium lactate, sodium lactate or potassium lactate, and calcium carbonate precipitates; and 3, the fermentation broth containing ammonium lactate, sodium lactate or potassium lactate is treated into lactic acid-containing solution and regenerated NH3 solution, NaOH solution or KOH solution through a bipolar membrane electrodialysis technology. The method provided by the invention can overcome the defect that calcium sulfate waste residues can be produced in the existing production technology-based lactic acid production, be directly linked up with the existing lactic acid fermentation step (adopting calcium carbonate to adjust a pH value), and realize closed cycle use of materials.

Description

Technical field [0001] The invention relates to a method for cleanly producing lactic acid by coupling calcium salt method and electrodialysis. Background technique [0002] Lactic acid and its salts and esters are widely used. In recent years, with the rise of poly-L-lactic acid, the production of L-lactic acid has received extensive attention. Poly L-lactic acid plastic has the advantages of high transparency, good molding degree, safety, etc., and has become the main variety in the field of degradable plastics. The United States, Japan and other countries are striving to realize the industrial production of poly-L-lactic acid. Daily necessities, containers, toys, films, medical and sanitary products produced by poly-L-lactic acid plastics are gradually being put on the market. With the shortage of petroleum resources, polylactic acid can be used to replace petroleum-based polymer materials, which is biodegradable. [0003] When lactic acid is produced by fermentation, the fe...

Claims

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Application Information

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IPC IPC(8): C12P7/56C07C59/08C07C51/42C12R1/845C12R1/225
Inventor 丛威杨鹏波王丽静王倩张勇吴霞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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