PURPOSE: To lower organic acid concentration in a hydrogen chloride gas by bringing a crude hydrogen chloride gas containing an organic acid into contact with sulfuric acid solution.
CONSTITUTION: A crude hydrogen chloride gas containing 500-1000ppm organic acid is introduced from an inlet pipe 2 into the bottom of an adsorbing gas. A sulfuric acid solution containing ≤30wt.% organic acid and kept at -10 to 30°C is introduced into the top of an adsorbing tower 4 and brought into countercurrent contact with the organic acid and the liquid is passed through a pump 5 and a heat exchanger 6 to control the temperature and fed to the tower top of the absorbing tower 4. The purified hydrogen chloride gas is taken out through an inlet pipe 7 and a sulfuric acid mist separator 8 from an inlet pipe 9.
YAMAMOTO CHUJI
GOTO YUKIMI
| JPS5842125A | 1983-03-11 | |||
| JPS6330303A | 1988-02-09 |