Patent ID: 8147786

Claim:
A method for processing an exhaust gas in a film-forming apparatus for forming a film by CVD on a substrate placed in a processing chamber by supplying a processing gas into the processing chamber, the method comprising: exhausting the exhaust gas from the processing chamber through a gas exhaust pipe connected to the processing chamber; supplying a heated reaction gas into the exhaust gas pipe at a position downstream from the processing chamber and at a preheated temperature to react with TiCl 4 in the exhaust gas and thereby produce ammonium chloride (NH 4 Cl) and suppress the production of an ammonium titanium chloride (TiCl 4 .4NH 3 ); and trapping the ammonium chloride as a by-product by a trap mechanism provided to the gas exhaust pipe, wherein a TiN film is formed by CVD on a substrate placed in the processing chamber by supplying TiCl 4 gas and NH 3 gas as the processing gas into the processing chamber, and wherein the ammonium chloride is produced by supplying NH 3 gas as the heated reaction gas, which reacts with TiCl 4 in the exhaust gas, into the exhaust gas and the production of the ammonium titanium chloride is suppressed in the exhaust gas.