Process for the purification of waste gas having a high chloride

Details Process for the purification of waste gas having a high chloride Process for the purification of waste gas having a high chloride

1993-04-16

1994-10-04

Lewis, Michael

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

423240R, 4232421, 423488, 423DIG18, 95233, B01D 5314, B01D 5334, C01B 701, C01B 707

Patent

active

053524209

ABSTRACT:
A process, for purification of a combustion flue gas from a garbage incineration plant having a chloride content and further contaminated with HF, SO.sub.2, NO.sub.x and heavy metals, and for recovery of HCl, including (a) removing HCl and HF and heavy metals from the combustion flue gas, in a first absorbent step, by washing the combustion flue gas with water for the first absorbent step, the water for the first absorbent step initially containing up to 20 g/l of HCl, and by separating HF in water from the first absorbent step from HCl in the water from the first absorbent step, the HCl in the water from the first absorbent step being concentrated to a level in excess of 50 g/l; (b) separating part of the concentrated HCl in the water from the first absorbent step in a rectification, within a single plant, into a more concentrated hydrochloric acid solution and a bottoms fraction; (c) removing further HCl, HF and heavy metals, which remain in the combustion flue gas after the first absorbent step, from the combustion flue gas, in a second absorbent step, by washing the combustion flue gas with water for the second absorbent step, water from the second absorbent step, containing up to 20 g/l of HCl, being recycled and used as the water for the first absorbent step; and (d) removing SO.sub.2, which remains in the combustion flue gas after the first absorbent step and after the second absorbent step, from the combustion flue gas in a subsequent step.

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