Patent ID: 8187364
Filing Date: 2012-05-29
Classification: B01D

Abstract:
1. A method of removing alkali chlorides and mercury contaminants from a gas stream generated by an industrial process that contains entrained dust, said method comprising (a) bringing the gas stream to a temperature below the boiling point of the alkali chlorides but above the boiling point of the mercury contaminants to thereby condense alkali chlorides on the entrained dust; (b) removing the entrained dust containing alkali chlorides from the gas stream; (c) inserting particulate material having mercury contaminants into the gas stream; (d) maintaining the gas stream at a temperature above the temperature at which said mercury contaminants vaporize to thereby vaporize the contaminants from the particulates while entraining the cleaned particulates in the gas stream; (e) removing the cleaned particulates from the gas stream; (f) absorbing the mercury contaminates in the gas stream on a sorbent in the gas stream; and (g) recovering the sorbent from the gas stream.