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Method for preparing methionine and sodium hydroxide through bipolar membrane electrodialysis

A bipolar membrane electrodialysis and sodium hydroxide technology, applied in the chemical field of bipolar membrane electrodialysis technology, can solve the problems of low conversion rate, high energy consumption, low alkali concentration, etc., and achieve significant industrial application value and environmental benefits. , the effect of enhancing the competitiveness of enterprises

Inactive Publication Date: 2014-07-23
ZHEJIANG CIRCLE TECH MEMBRANE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has been applied in inorganic processes, such as from NaCl, Na 2 SO 4 , KF, KNO 3 , NH 4 SO 4 Preparation of corresponding acids and bases from salt solutions or waste liquids, and the separation and transformation of organic acid salts to prepare organic acids have also been reported, such as: Journal of biotechnology magazine, 2002, No. 96, pages 223 to 239, published the document Process development and optimization of lactic acid purification using electrodialysis (translated as: research on purifying lactic acid with electrodialysis process); Chinese Patent Publication Nos. High consumption, low conversion rate, low concentration of alkali obtained, etc.

Method used

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  • Method for preparing methionine and sodium hydroxide through bipolar membrane electrodialysis
  • Method for preparing methionine and sodium hydroxide through bipolar membrane electrodialysis
  • Method for preparing methionine and sodium hydroxide through bipolar membrane electrodialysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0032] Pump 0.5 liters of 4.25% sodium methionine and 2.5% sodium carbonate feed solution into the salt chambers of 5 groups of 9*21 three-compartment bipolar membrane electrodialysis membrane stacks, and circulate at a flow rate of 25L / h. 0.5 liters of purified water are pumped into the acid chamber and alkali chamber of the membrane stack respectively, and circulated at the same flow rate of 25L / h. Then pump 0.5L sodium sulfate with a concentration of 3% into the electrode eluent chamber, and circulate at a flow rate of 25L / h. Turn on the DC power supply, keep the temperature of the acid chamber at a constant temperature of 35 degrees, and control the current density at 150A / m 2 , reacted for 3 hours, the acid chamber obtained about 2.4% methionine, the conversion rate of sodium methionine was about 85%, and the recovery rate of methionine was 80%. The alkali room obtains about 1.8% sodium hydroxide solution, and the energy consumption is 7kWh / kg methionine.

Embodiment 3

[0034] Pump 20 liters of feed solution with a concentration of 4.25% sodium methionine and 2.5% sodium carbonate into the acid / salt chambers of 20 groups of 20*40 two-compartment bipolar membrane electrodialysis membrane stacks, and circulate at a flow rate of 300L / h , pump 20 liters of purified water into the alkali chamber of the membrane stack, and also circulate at a flow rate of 300L / h. Then pump 5L of sodium sulfate with a concentration of 3% into the electrode eluent chamber, and circulate at a flow rate of 200L / h. Turn on the DC power supply, keep the temperature of the material liquid chamber at a constant temperature of 35 degrees, and control the current density at 500A / m 2 , reacted for 3 hours, the conversion rate of sodium carbonate reached 99%, the conversion rate of sodium methionine reached more than 95%, the energy consumption was 1.8kWh / kg methionine, the current efficiency was about 75%, and the recovery rate of sodium methionine reached 95%. The concentra...

Embodiment 4

[0036] Pump 1L solution concentration of 17% sodium methionine and 10% sodium carbonate into the dilute / salt chambers of 5 groups of electrodialysis membrane stacks with a size of 9*21cm, and circulate at a flow rate of 40L / h. Purified water is pumped into the concentrated chamber of the membrane stack and circulated at a flow rate of 40L / h, and then 0.5L sodium sulfate with a concentration of 3% is pumped into the electrode eluent chamber and circulated at a flow rate of 25L / h. Turn on the DC power supply, keep the temperature of the material liquid chamber at a constant temperature of 35 degrees, and control the current density at 500A / m 2 , reacted for 1.5 hours, the sodium carbonate shifted 90%, and the methionine content in the concentrated chamber was 1%. Dilute the feed solution after electrodialysis by 4 times, that is, pump 0.5 liter of feed solution with a concentration of 4.25% sodium methionine and 0.25% sodium carbonate into 5 groups of 9*21 two-compartment bipola...

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Abstract

The invention discloses a method for preparing methionine and sodium hydroxide through applying a bipolar membrane electrodialysis technology. The method comprises the specific process: diluting a methylthioethyl hydantoin (hydantoin) hydrolysate to one-third to one-fifth of the original concentration, and filtering with a microporous filter; then pumping the hydrolysate into one of a salt chamber or a salt / acid chamber of a bipolar membrane electrodialysis device, and injecting a certain concentration of an electrolyte solution into other compartments; connecting a cathode and an anode of the bipolar membrane electrodialysis device respectively with a negative electrode and a positive electrode of a direct-current power source, starting the bipolar membrane electrodialysis device, controlling the current density of a direct-current electric field to be 50-150 mA / cm<2> and the temperature at 20-40 DEG C, and thus obtaining methionine with higher purity in an acid chamber, wherein the methionine recycling rate reaches more than 95% and the current efficiency reaches about 70%; and at the same time, collecting obtained carbon dioxide, and thus obtaining sodium hydroxide with the concentration of 4-6% in an alkali chamber. The method has the advantages of high yield, no pollution, less use of raw materials, and good application prospects.

Description

technical field [0001] The invention belongs to the application of bipolar membrane electrodialysis technology in the chemical industry, and in particular relates to a method for preparing methionine and sodium hydroxide by bipolar membrane electrodialysis. Background technique [0002] Methionine, also known as methionine, is the only non-polar α-amino acid containing sulfur. The appearance of methionine is white hexagonal flaky crystal or powder, with special smell, slightly sweet taste, melting point is 281℃, relative density is 1.340kg / m 3 ;Methionine is soluble in water (3.3g / 100mL, 25℃), dilute acid and dilute alkali, very slightly soluble in alcohol, insoluble in ether, benzene, acetone and petroleum ether. Methionine is widely used in pharmaceutical nutrition, food additives, feed additives, etc. At present, the global annual production capacity is about 1 million tons, and the annual output is about 700,000 tons. [0003] The production process of methionine main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44B01D61/48C01D1/04C07C323/58C07C319/28C07C319/20
Inventor 沈江南叶云飞王利祥黄杰陈珏洁
Owner ZHEJIANG CIRCLE TECH MEMBRANE TECH
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