Method and apparatus for sulfuric acid concentration

Details Method and apparatus for sulfuric acid concentration Method and apparatus for sulfuric acid concentration

1990-10-11

1991-12-24

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423531, 423DIG2, 422161, 159 471, 203 12, C01B 1769, C01B 1790, C01B 1748

Patent

active

050750976

ABSTRACT:
Dilute waste sulfuric acid is concentrated by heating it against product acid and then passing it through two contact zones separated by a collection zone. The dilute acid scrubs vapour produced in the collection zone and from a high temperature acid reboiler. In the collection zone acid is drawn off, heated, and recirculated to the collection zone where part of the liquid flashes to vapour. The main heat input is to the more dilute low temperature recirculating acid from the first contact zone rather than to the more concentrated high temperature acid in the reboiler. As a result, less sulfuric acid vapour is generated; the major portion of the heat can be fed to the process at low temperature; and only a single column is required, having a single cool clear water vapour exit stream to dispose of.

REFERENCES:
patent: 3294650 (1966-12-01), Manteufel
patent: 3754074 (1973-08-01), Grantham
patent: 4200616 (1980-04-01), Johansen
patent: 4719088 (1988-01-01), Itoh et al.
patent: 4778566 (1988-10-01), Vinz
patent: 4910011 (1990-03-01), Dorr et al.

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