Method for preparing L-lactic acid and/or L-lactate

A lactate, lactic acid technology, applied in the field of preparation of L-lactic acid and/or L-lactate, can solve the problems of high equipment purchase cost and use cost, difficult control of production cost and high energy consumption

Inactive Publication Date: 2012-06-27
安徽中粮生化格拉特乳酸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the existing method have many process steps, high equipment purchase cost and use cost, high energy consumption, and difficult control of production cost, so that the manufacturing cost of L-lactic acid and / or L-lactate is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of L-lactic acid and L-sodium lactate comprises the following processing steps successively:

[0029] a) Preparation of L-lactic acid fermentation broth by microbial fermentation:

[0030] The strain used for fermentation is thermophilic bacillus known in the art, the seed culture medium used for fermentation and its preparation, the formula of fermentation medium and its preparation are part of the prior art, and will not be repeated here. In the fermentation medium, Glucose with a concentration of 200g / L is used as the carbon source and yeast powder as the nitrogen source for fermentation; the fermentation temperature is 50-52°C, and the pH regulator is added in real time during the fermentation process to adjust the pH value so that the pH is 6.0-6.2, and the pH regulator Be the calcium hydroxide of 20% for weight percent concentration, when glucose is exhausted, when fermentation finishes, make 2700ml, the L-lactic acid fermented liquid that L...

Embodiment 2

[0042] The preparation method of L-lactic acid and L-potassium lactate comprises the following processing steps in sequence:

[0043] a) Preparation of L-lactic acid fermentation broth by microbial fermentation:

[0044] In this example, the specific steps and parameters for preparing L-lactic acid fermentation broth by microbial fermentation are the same as those in step a) of Example 1, which will not be repeated here, and 2700ml of L-lactic acid with a calcium L-lactate concentration of 159g / L was prepared. - Lactic acid fermentation broth.

[0045] b) Coagulate and filter the L-lactic acid fermentation liquid to obtain the fermentation clear liquid:

[0046] Take 2,700ml of the L-lactic acid fermentation broth prepared in step a) with an L-calcium lactate concentration of 159g / L, first use calcium hydroxide with a concentration of 30% by weight to adjust the pH of the L-lactic acid fermentation broth to 10.0, and then use Alkaline flocculant and flocculation treatment of...

Embodiment 3

[0056] The preparation method of L-lactic acid and L-potassium lactate comprises the following processing steps in sequence:

[0057] a) Preparation of L-lactic acid fermentation broth by microbial fermentation:

[0058] The strain used for fermentation is thermophilic bacillus known in the art, the seed culture medium used for fermentation and its preparation, the formula of fermentation medium and its preparation are part of the prior art, and will not be repeated here. In the fermentation medium, Glucose with a concentration of 220g / L is used as the carbon source and yeast powder as the nitrogen source for fermentation; the fermentation temperature is 50-52°C, and the pH regulator is added in real time during the fermentation process to adjust the pH value so that the pH is 6.0-6.2, and the pH regulator Be the calcium hydroxide that weight percent concentration is 25%, when glucose is exhausted, when fermentation finishes, make 2700ml, the L-lactic acid fermented liquid tha...

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PUM

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Abstract

The invention discloses a method for preparing L-lactic acid and / or L-lactate. The method sequentially comprises the following steps of: a) preparing an L-lactic acid fermentation solution by microbial fermentation; b) treating the L-lactic acid fermentation solution by adopting any one of flocculation, filtration, centrifuging and ultra-filtration to obtain a clear fermentation solution; c) performing acidolysis and filtration on the clear fermentation solution to obtain acidolysis filtrate; d) decolorizing the acidolysis filtrate to obtain a decolorized solution; and e) separating the decolorized solution by adopting anion adsorption exchange resin, and thus obtaining the L-lactic acid and / or the L-lactate. By adopting the technical scheme, the method only has five steps, and a nano membrane filtration step and a molecular distillation step are not used any more, so compared with the conventional method, the method has the advantages of a few steps, low equipment purchasing cost and using cost, low energy consumption and easily controlled production cost. By adopting the method, the manufacturing cost of the L-lactic acid and / or the L-lactate is low.

Description

technical field [0001] The invention relates to a preparation method of L-lactic acid and / or L-lactate. Background technique [0002] Lactic acid is an important biochemical product, widely used in medicine, food, daily chemical, chemical, petroleum, leather and other fields. In recent years, L-lactic acid polymerization has been used internationally to produce polylactic acid, a biodegradable material, and has developed rapidly. The excellent degradability of polylactic acid has shown the world the great development prospects of L-lactic acid. Sodium / potassium L-lactate is suitable for meat products. Because of their neutral pH value and slightly salty taste, they have a significant fresh-keeping effect. Sodium / potassium L-lactate is widely used as a bacteriostatic agent in sausage, ham, poultry and other products middle. [0003] At present, the method for extracting L-lactic acid from L-lactic acid fermentation broth is mainly the calcium salt method, that is: add conce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/56C07C59/08C07C51/42C12R1/225C12R1/245C12R1/07C12R1/845
Inventor 张明刚李文友刘春尧
Owner 安徽中粮生化格拉特乳酸有限公司
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