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US 6,548,700 B2Granted
Process for the precipitation of cystine
AssigneeConsortium fur Elektrochemische Industrie GmbH
InventorsWolfgang Döring, Jürgen Stohrer
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Abstract
A process for precipitating cystine from a solution in sulfuric acid, includes forming a mixture of a solution of cystine in aqueous sulfuric acid and of an aqueous solution of a base by simultaneous metering the cystine solution and the aqueous base solution into a mixing container. The metering takes place in such a way that the mixture in the container has a pH between 1.0 and 7.0 and a temperature between 30° C. and the boiling point of the mixture.
Claims11
A process for precipitating solid cystine crystals from a solution in sulfuric acid, which comprises
- forming a mixture of a solution of cystine in aqueous sulfuric acid and of an aqueous solution of a base by simultaneous metering said cystine solution and said aqueous solution of a base into a mixing container;
- the metering taking place in such a way that the mixture in the container has a pH between 1.0 and 7.0 and a temperature between 30° C. and the boiling point of the mixture;
- and
- precipitating solid crystals of cystine, which have a residual sulfate content of less than 300 ppm.
1 more element
Dependencies are inferred from the claim text.