| 摘要 |
<p>1,126,176. Purifying and liquefying crude chlorine. KONINKLIJKE NEDERLANDSCHE ZOUTINDUSTRIE N.V. 11 Jan., 1966 [20 Jan., 1965], No. 1256/66. Heading B1L. A gas stream of impure chlorine is purified and liquefied in a multi-stage absorption process in which at least half the chlorine present originally. in the gas stream is absorbed during a first absorption stage, after which residual gas is maintained in mass exchanging contact with the rich absorbent solution which has yet to leave the first absorption stage; the rich solution is subsequently distilled to recover solvent and to release chlorine gas which is then liquefied. The flow of gas and absorbing solution in the absorbers and in the various stages may either co- or counter-current. In Fig. 1, a stream 1 of chlorine-containing gas passes by buffer tank 2 and line 3 to cooled cocurrent first stage absorber 4 wherein at least half the chlorine in the gas stream is absorbed by solvent and thence in turn by line 5 to cooled cocurrent absorber 6, and line 7 to cooled absorber 8, effluent gases leaving at 9. Carbon tetrachloride is used as absorbing solvent in all stages, the loaded solvent being freed from chlorine in distillation unit 10, and is supplied to absorber 6 by lines 11, valve 22 and line 14, a: portion being passed by valve 21 and line 12 to absorber 8, whence it is returned to line 14 by line 13. Solvent leaving absorber 6 passes to first stage absorber 4 by line 15, the rich solution being returned to distillation section 10 by line 16. buffer tank 2. line 17, pump 18 and line 19. Liquid chlorine leaves by line 20.</p> |
