Patent ID: 6709485
Filing Date: 2004-03-23
Classification: B01D,Y02C,Y02P

Abstract:
A process for removing chlorine gas from an unpurified chlorine-, hydrogen-, and carbon dioxide tail gas stream comprising the steps of:(a) contacting a an unpurified chlorine-, hydrogen-, and carbon dioxide-containing tail gas stream with a zeolite molecular sieve having a molecular pore diameter greater than the molecular diameter of the carbon dioxide and hydrogen and smaller than the molecular diameter of chlorine so that at least a portion of the carbon dioxide is absorbed onto the molecular sieve, and thereby producing a purified tail gas stream that contains substantially all of the chlorine and hydrogen values and a reduced or no amount of carbon dioxide values; and (b) contacting the purified tail gas stream with an aqueous sodium hydroxide scrubbing solution for a sufficient amount of time in order to remove substantially all of the chlorine values from the purified tail gas stream, whereby producing a purified sodium hypochlorite solution that is substantially free of sodium carbonate.