US EPA

8712109 

Journal Article 

SEPARATION OF SULFURIC ACID FROM A MIXTURE WITH HYDROCHLORIC ACID 

Kochetkova, TM 

1986 

Yes 

Journal of Applied Chemistry of the USSR
ISSN: 0021-888X 

59 

7 pt 2 

1481-1482 

English 

A method consisting of distillation of HC1 with steam with the aid of a fractionating column is recommended for such mixtures left bracket 2 right bracket . Sulfuric acid of higher concentration is obtained as the bottom product. This method involves a high consumption of heat and special equipment (a fractionating column); only the sulfuric acid is concentrated, while hydrochloric acid is very dilute. Urotropin is used for extracting nitric acid from solutions. The author's proposed method can be used for separating mixtures of sulfuric and hydrochloric acids and concentrating sulfuric acid without special equipment or high energy consumption. The hydrochloric acid does not become diluted in the process. It is shown that the stability of the urotropin-sulfuric acid complex is higher than that of the analogous complex with hydrochloric acid, and therefore the former competes more successfully during extraction. Solutions of sulfuric acid of different concentrations can be obtained by using different volumes of distilled water for this purpose. The extractant is regenerated in the process and can be used again.