Method of preparing sarcosine by bipolar membrane electrodialysis process
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A bipolar membrane electrodialysis and sarcosine technology, which is applied in the field of preparation of sarcosine, can solve the problems of inexhaustibility, increased cost, secondary pollution, etc., and achieve the effect of low operating cost, good quality and simple operation
Inactive Publication Date: 2015-07-01
HUBEI XITAI CHEM CO LTD
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[0007] (1) Alcohol desalination method: This method is complicated to operate and cannot be removed at one time, and the cost is increased due to the consumption of alcohol
[0008] (2) Ion exchange method: This method has a good desalination effect, but requires a large amount of acid and alkali to activate the ion exchange resin, resulting in secondary pollution
[0010] But above-mentioned three kinds of methods all inevitably have a large amount of sodium chloride to produce
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Embodiment 1
[0024] Add hydroxyacetonitrile with a mass fraction of 50% to the reaction vessel, stir, cool to a temperature less than 10°C, add dropwise a 25% mass fraction of methylamine solution, the molar ratio of hydroxyacetonitrile to methylamine is 1:1.2, During the dropping process, the temperature is controlled to be less than 15°C, the dropping process lasts for 1 hour, and the stirring is continued for 1 hour after the dropping is completed, to obtain a methylaminoacetonitrile solution;
[0025] Add sodium hydroxide to the obtained methylaminoacetonitrile solution, and hydrolyze to obtain sodium methylaminoacetate, ie, a mixed solution of sodium sarcosinate and sodium hydroxide, and set the reaction temperature at 100°C.
[0026] Dilute the 1 mol sodium sarcosinate mixture obtained above to 450g, control the temperature at 30°C, turn on the power supply under the conditions of 5.5A current and 15cm / s flow rate, and stop the operation when the conductance value reaches 2000us / cm fo...
Embodiment 2
[0029] The mixed solution of 1mol of sodium sarcosinate was diluted to 750g, other conditions were the same as in Example 1, and the conductivity value reached 2000us / cm in about 1 hour when electrodialysis was used, and 62.5g of sodium sarcosinate was obtained, with a yield of 70% and a content of 99.3%.
Embodiment 3
[0031] The sodium sarcosinate mixed solution of 1mol is diluted to 750g, and electric current is 10A, and other conditions are identical with embodiment 1, and current dialysis takes 40 minutes, and conductance value reaches 2000us / cm, obtains sarcosine 54.5g, yield 61.2%, content was 97.2%.
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Abstract
The invention discloses a method of preparing sarcosine by a bipolar membrane electrodialysis process. The method comprises the following steps: diluting a sodium sarcosinate aqueous solution to 5%-25%, then, adding a pre-prepared 5% sodium sulfate solution into a material chamber and a polar chamber, adding equal volume of deionized water into the acid chamber and an alkaline chamber, starting a circulating pump in each chamber after getting ready, regulating flow velocity to 3cm / s-25cm / s, starting a bipolar membrane electrodialysis equipment power supply, controlling the temperature to 10-50 DEG C in an electrodialysis process, and regulating current to 1-10A; after the conductivity of the material chamber is reduced to 1000 mu s / cm-3000 mu s / cm, stopping operation, discoloring, concentrating, separating and drying a feed liquid obtained in the acid chamber to obtain sarcosine, and also discoloring, concentrating, separating and drying a sodium hydroxide solution obtained in the alkaline chamber. The invention aims to provide the method of preparing sarcosine by the bipolar membrane electrodialysis process, which is simple and efficient, low in cost, free of pollution, and capable of comprehensively utilizing a byproduct sodium hydroxide.
Description
technical field [0001] The invention relates to a preparation method of sarcosine. In particular it relates to the preparation of sarcosine using bipolar membrane electrodialysis. Background technique [0002] Sarcosine has a molecular formula of CH3NHCH2COOH and a melting point of 204-212°C. Sarcosine is a white crystal or crystalline powder, slightly sweet in taste, hygroscopic, soluble in water, slightly soluble in ethanol, insoluble in ether or acetone. Sarcosine is a kind of amino acid. It participates in metabolism in the living body but does not produce heat. It has a significant effect on improving intelligence, restoring physical strength, and strengthening muscles. Therefore, it is widely used in the fields of medicine, food, farming and daily chemicals. Sodium sarcosinate is an important intermediate in the synthesis of sarcosine. [0003] Currently, there are two main methods for synthesizing sarcosine: [0004] 1. Chloroacetic acid method: Salt is formed fr...
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