Industrial process for the separation and recovery of chlorine

Details Industrial process for the separation and recovery of chlorine Industrial process for the separation and recovery of chlorine

1992-08-03

1993-10-19

Niebling, John

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Halogenous component

423222, 95178, 95233, C01B 701, B01D 5334

Patent

active

052543234

ABSTRACT:
A gaseous mixture containing chlorine, carbon dioxide and non-condensable gas is compressed and cooled to separate it into a residual gas formed principally of a major portion of the non-condensable gas and a condensate formed primarily of chlorine. The condensate is fed to a stripping column to desorb carbon dioxide and a minor portion of the non-condensable gas dissolved in the condensate. The stripped gas formed primarily of chlorine and carbon dioxide may be treated further. Namely, the stripped gas is mixed with the residual gas. At least a portion of the mixed gas is fed into an absorption column, whereby a major portion of remaining chlorine is absorbed to lower the chlorine content Removal of chlorine from such a gaseous mixture or an off-gas from the above process can be achieved by washing it with an aqueous solution or suspension containing an alkali metal sulfite and/or an alkaline earth metal sulfite while controlling the pH of the solution or suspension within a range of 1.9-6.3.

REFERENCES:
patent: 2656011 (1953-10-01), Frey
patent: 3501922 (1970-03-01), Schmidt et al.
patent: 3896213 (1975-07-01), Hirdler
patent: 3948622 (1976-04-01), Tsao
patent: 3972691 (1976-08-01), Fukushima et al.
patent: 4128409 (1978-12-01), Bennett
patent: 4321795 (1982-03-01), Brandt et al.
patent: 5102638 (1992-04-01), Girrbach et al.
patent: 5124135 (1992-06-01), Girrbach et al.

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