Solid sodium sarcosine preparation method
A technology for sodium sarcosinate and sarcosine, applied in the field of carboxyl generation, can solve the problems of high production cost, difficult recovery, low yield and the like, and achieve the effects of reduced requirements, high yield and mild reaction conditions
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Embodiment 1
[0025] The preparation method of solid sodium sarcosinate comprises the steps:
[0026] a. Hydroxyacetonitrile and methylamine are condensed to obtain methylaminoacetonitrile:
[0027] Add hydroxyacetonitrile with a mass fraction of 50% to the reaction vessel, stir, cool with cold water 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: 1.1. During the dropping process, the temperature is controlled to be less than 15°C. The dropping process lasts for 1 hour. After the dropping is completed, continue to stir for 1 hour to obtain a methylaminoacetonitrile solution;
[0028] b. adding sodium hydroxide to the above-mentioned methylaminoacetonitrile solution at 100°C, the mol ratio of hydroxyacetonitrile and sodium hydroxide is 1:1.463 and hydrolyzed to obtain sodium methylaminoacetate, namely sodium sarcosinate and sodium hydroxide;
[0029] c. add the hydrochloric acid equimolar ...
Embodiment 2
[0034] The preparation method of solid sodium sarcosinate comprises the steps:
[0035] a. Hydroxyacetonitrile and methylamine are condensed to obtain methylaminoacetonitrile:
[0036] Add hydroxyacetonitrile with a mass fraction of 50% to the reaction vessel, stir, cool with cold water 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: 1.6. During the dropping process, the temperature is controlled to be less than 15°C. The dropping process lasts for 1 hour. After the dropping is completed, continue to stir for 1 hour to obtain a methylaminoacetonitrile solution;
[0037] b. Add sodium hydroxide to the above-mentioned methylaminoacetonitrile solution at 120°C, the mol ratio of hydroxyacetonitrile to sodium hydroxide is 1: 1.563 and hydrolyzed to obtain sodium methylaminoacetate, i.e. a mixed solution of sodium sarcosinate and sodium hydroxide;
[0038] c. add the hydrochloric ...
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