Liquid purification or separation – Processes – Chemical treatment
Patent
1995-03-03
1997-02-25
Hruskoci, Peter A.
Liquid purification or separation
Processes
Chemical treatment
210755, 210758, 210916, 422 5, 423226, 4232422, 42324301, C02F 120
Patent
active
056056354
ABSTRACT:
Process for purifying gaseous or liquid effluents containing sulphur-containing derivatives (H.sub.2 S, alkyl mercaptans, SO.sub.2).
This process comprises: (i) basification of the effluent to be treated at a pH >9 in the presence of a base of general formula M--OH, in which M represents an alkali metal, an alkaline-earth metal, an agent for condensation between the organic part of the compound of formula I below and the sulphur-containing derivative or a phase transfer agent and especially a quaternary ammonium or a ligand; (ii) placing of the product obtained in (i) in contact with a compound of general formula I: X--(CH.sub.2).sub.n --CO--R, in which: X represents: a halogen, a sulphonyl halide of formula X'--SO.sub.2 --R', in which X' represents a halogen and R' represents a C.sub.1 -C.sub.20 alkyl group or an optionally substituted aryl group, an OH group; R represents: a C.sub.1 -C.sub.16 alkoxy, a group NH--R", in which R" represents a hydrogen atom or a primary or secondary amine radical, a group OR.sub.2 in which R.sub.2 represents a hydrogen atom, an alkali metal, an alkaline-earth metal or an ammonium group, or a halogen; n is an integer between 1 and 4, at a temperature between 12.degree. C. and 95.degree. C. and at atmospheric pressure.
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patent: 4874530 (1989-10-01), Kobayashi et al.
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