Patent ID: 7887776

Claim:
A process for the production of hydrogen chloride and metal sulfate, comprising the steps of: mixing predetermined quantities of a metal chloride, oleum, and a water-containing liquid in a reaction vessel, such that formation of gaseous HCl and a sulfate-containing solution occurs; discharging said gaseous HCl from said reaction vessel; discharging said sulfate-containing solution from said reaction vessel; cooling said sulfate-containing solution to a temperature from about 10° C. to about 50° C. such that precipitation of a sulfate salt-containing solid occurs; separating said sulfate salt-containing solid from the supernatant liquid; washing said sulfate salt-containing solid with a predetermined quantity of water, whereby to obtain said metal sulfate; wherein said reaction vessel is not heated via an external heat source, said metal chloride is KCl, and said metal sulfate is K 3 H(SO 4 ) 2 ; and, optionally, repeating said steps.