Process for the purification of waste gases containing hydrochlo

Details Process for the purification of waste gases containing hydrochlo Process for the purification of waste gases containing hydrochlo

1988-07-28

1989-10-17

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Halogenous component

423242, 423481, C01B 700, C01B 1700, C01B 701

Patent

active

048745910

ABSTRACT:
In a process for the purification of waste gases containing hydrochloric acid and sulphur dioxide obtained from incinerating plant, in particular refuse incinerating plant, hydrochloric acid and gypsum are to be recovered. For that purpose a magnesium hydroxide suspension is used as a regenerable scrubbing agent, resulting in the production of a readily filtrable coarsely particulate calcium sulphate from the sulphate content by precipitation with calcium ions and in hydrochloric acid of 16-30 mass % up to maximum purity by the pyrohydrolysis of the chloride content. The magnesium oxide which is formed is returned to the waste gas scrubber after hydrating.

REFERENCES:
patent: 3481702 (1969-12-01), Moore et al.
patent: 4108959 (1978-08-01), Tatani et al.
patent: 4193971 (1980-03-01), Kawamata et al.
patent: 4362709 (1982-12-01), Grohmann et al.

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