| 摘要 |
<p>PURPOSE: To efficiently remove oxidative gases by bringing the gas contg. the oxidative gases into contact with an aq. soln. contg. dissolved S in the presence of a base, then bringing this gas into contact with an aq. oxidant-contg. reactant soln. after cooling, oxidizing and regenerating this aq. soln. and circulating the aq. soln. CONSTITUTION: The gas contg. the oxidative gases, such as HCN, COS and H2 S, is sent from a line 2 to a first contactor 1 where the base, such as NH3 , is added to the soln. and is brought into contact with the first aq. soln. contg. the dissolved S to remove HCN. The purified gas is admitted through a line 5 into a heat exchanger 14 and a CS2 cracking reactor 15 and is further cooled down to the m.p. of S by a cooler 26 to condense moisture. The gas is then brought into contact with the aq. Fe<3+> chelate-contg. reactant soln. of nitrilotriacetic acid by a second contactor 36, by which the oxidative gases are removed. The aq. reactant soln. is sent to a regenerator 45 and is oxidized and regenerated by air. The regenerated liquid is returned to the second contactor 36. On the other hand, the S-contg. stream is sent from the regenerator 45 to a separator 55 where the S-rich stream is recovered. The dissolved S-contg. stream is sent from a line 59 to the first contactor 1.</p> |
