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Method for preparing lactic acid by applying double pole film electrodialysis technique

A technology of bipolar membrane electrodialysis and electrodialyzer, applied in the field of preparation of lactic acid using bipolar membrane electrodialysis technology, can solve the problems of product loss cost, loss, increase, etc., and achieve significant industrial application value and environmental benefits

Inactive Publication Date: 2008-08-06
江苏道森生物化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Luo Tiehong (Membrane Science and Technology [J], 2007, 27(4): 66-69) found that water migrated to the salt chamber when a membrane permeator with a similar structure was used to separate lactic acid, making the final lactic acid concentration lower than the initial one. The concentration of sodium lactate, which is unfavorable in industry, because it increases the energy required for concentration, and the lactic acid prepared by this method also contains part of lactate, which will be lost in downstream operations such as molecular distillation, resulting in product losses and rising costs

Method used

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  • Method for preparing lactic acid by applying double pole film electrodialysis technique

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Experimental program
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Effect test

Embodiment 1

[0017] Pump 2L of the pretreated lactic acid fermentation broth (with a lactate content of 1.5mol / L) at a rate of 70L / h into the salt chamber of the salt / acid two-chamber electrodialyzer (Figure 1). Then pump 0.6L of lactic acid solution with an initial concentration of 0.2mol / L into the acid chamber at a rate of 60L / h to increase the conductivity of the acid chamber solution. Control the voltage so that the current density is maintained at 160mA / cm 2 , the operating temperature is 60°C, the reaction is 4 hours, the conversion rate of lactate reaches 95%, the energy consumption is 2.6kW·h / kg, the current efficiency is about 80%, and the recovery rate of lactic acid can reach 90%.

Embodiment 2

[0019] Pump 2L of pretreated lactic acid fermentation broth (1.5mol / L lactate content) at a rate of 100L / h into the salt chamber of the acid / salt / alkali three-chamber electrodialyzer (Figure 2). Then pump 1L of lactic acid solution with an initial concentration of 0.2mol / L into the acid chamber at a rate of 60L / h, and 1L of NaOH solution with an initial concentration of 0.1mol / L into the alkali chamber at a rate of 70L / h to increase the acid-base The conductivity of the solution in each chamber. Control the voltage so that the current density is maintained at 80mA / cm 2 , the operating temperature is 40°C, the reaction is 6 hours, the conversion rate of lactate reaches 97%, the energy consumption is 5.5kW·h / kg, the current efficiency is 90%, and the recovery rate of lactic acid can reach 90%.

Embodiment 3

[0021] The method is the same as in Example 1, except that the electrodialyzer is assembled between a pair of electrodes and three membrane repeating units shown in Figure 1 form a plurality of compartments, and the compartments are combined into an anode compartment-acid compartment - salt chamber - acid chamber - salt chamber - acid chamber - salt chamber - cathode chamber. The acid chambers were perfused with lactic acid solution with an initial concentration of 0.2mol / L at a flow rate of 80L / h to increase the conductivity of the acid chamber solution. The salt chambers were perfused with fermentation broth with a lactate content of 1.5 mol / L at a flow rate of 100 L / h. Control the voltage so that the current density is maintained at 160mA / cm 2 , the operating temperature is 25°C, the reaction is 6 hours, the conversion rate of lactate reaches 94%, the energy consumption is 3.2kW·h / kg, the current efficiency is about 80%, and the recovery rate of lactic acid can reach 90%.

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Abstract

The invention discloses a method for preparing lactic acid with bipolar membrane electrodialysis technology. Lactic acid fermentation liquid passes through an electrodialyzer, which transforms contained lactates into lactic acid. The membrane tank configuration of the adopted electrodialyzer can be of two-cell type including an acid cell and a salt cell divided by an anion membrane or of three-chamber type including an acid cell, a salt cell and a base cell divided by a cation membrane and an anion membrane. For preparation, lactic acid fermentation liquid is transmitted into the salt cell and water is transmitted into the acid cell or the base cell. Under the effect of a circulating pump, the materials flow circularly with a current density of 80-160mA / cm2 at an operation temperature of 25-60 DEG C. The invention can completely supersede the prior calcium lactate acidifying technology without addition of acids for H+ supply and without production of waste acid, salt or base liquid. The transformation efficiency of lactic acid is higher than 98 percent, the recovery of lactic acid is higher than 90 percent and the current efficiency is higher than 70 percent, so the method can reduce environment pollution and lower consumption of chemical raw materials and energy and has remarkable industrial application value and environmental benefit.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a method for separating lactate ions from lactate fermentation liquid by using a bipolar membrane electrodialyzer. Background technique [0002] Lactic acid is an important organic acid, which has many uses in food, medicine, chemical industry, etc., especially as a monomer for the synthesis of degradable material polylactic acid, which has attracted widespread attention. Traditional lactic acid production uses the calcium salt method to extract lactic acid. Generally, a calcium neutralizer is added during the fermentation process to generate a calcium lactate-containing fermentation broth. After repeated crystallization and crystal washing, sulfuric acid is added to extract lactic acid, and it is decolorized through repeated adsorption. The steps are refined to obtain the product. The traditional fermented calcium salt method will consume a large amount of alkali ...

Claims

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Application Information

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IPC IPC(8): C07C59/08C07C51/02B01D61/42
Inventor 白涵许兵
Owner 江苏道森生物化学有限公司
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