Method for recovering and preparing L-cystine from electrolyzed L-beta-mercaptoalanine effluent
A technology of cysteine and cystine, which is applied in the field of waste liquid recovery and preparation of L-cystine, which can solve the problems of unfavorable on-site operation of workers, increase of the total amount of organic toxic substances, heavy odor and toxicity, etc.
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Embodiment 1
[0025] Select 100Kg of waste liquid after the electrolytic preparation of L-cysteine hydrochloride crystallization with pure water to adjust the concentration of L-cysteine to 10wt%, add 500g of activated carbon, stir for 2 hours at normal temperature, filter, and the filtrate is measured , wherein the free hydrochloric acid is about 1%, and the iron content is about 20ppm.
[0026] Add dropwise 130Kg of 5% ammonium persulfate aqueous solution by weight to the waste liquid under stirring. Since the oxidation reaction is an exothermic reaction, the rate of addition is controlled so that the temperature of the reaction system is between 20 and 40°C. After the addition, continue to stir for 1 hour, then adjust the pH value to 5 with ammonia water, the solid L-cystine precipitates, cool to room temperature, filter, wash with pure water, and dry to obtain 9.94Kg of white powder solid.
[0027] After analysis of the white powder solid, the L-cystine content is 99.5%, the convers...
Embodiment 2
[0029] Choose to adjust L-cysteine concentration with pure water and be 20wt% waste liquid 100Kg after the electrolytic preparation of L-cysteine hydrochloride crystallization, add 500g active carbon, stir 2 hours under normal temperature, filter, and filtrate measures among them The free hydrochloric acid is about 6%, and the iron content is about 40ppm.
[0030] Add 140Kg of 10% by weight sodium persulfate aqueous solution dropwise to the waste liquid under normal temperature stirring, and control the dropping rate to make the temperature of the reaction system 40-45°C. After the addition, continue to stir for 1 hour, then adjust the pH value to 5 with ammonia water, the solid L-cystine precipitates, cool to room temperature, filter, wash with pure water, and dry to obtain 19.8Kg of white powder solid.
[0031] After analysis of the white powder solid, the L-cystine content is 98.5%, the conversion rate of L-cysteine is 99%, and the reaction selectivity is 99%. The su...
Embodiment 3
[0033] Choose to adjust L-cysteine concentration with pure water and be 20wt% waste liquid 100Kg after the electrolytic preparation of L-cysteine hydrochloride crystallization, add 500g active carbon, stir 2 hours under normal temperature, filter, and filtrate measures among them The free hydrochloric acid is about 5%, and the iron content is about 70ppm.
[0034] Add 65 kg of ammonium persulfate aqueous solution with a weight content of 20% to the waste liquid dropwise under normal temperature stirring, and control the dropping rate to make the temperature of the reaction system 40-45°C. After the addition, continue to stir for 1 hour, then adjust the pH value to 5 with ammonia water, the solid L-cystine precipitates, cool to room temperature, filter, wash with pure water, and dry to obtain 19.9Kg of white powder solid.
[0035] After analysis of the white powder solid, the L-cystine content is 98.5%, the conversion rate of L-cysteine is 99%, and the reaction selectivit...
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