| 摘要 |
1502157 Purification of sour water EXXON RESEARCH & ENG CO 30 May 1975 [24 June 1974 29 July 1974] 23623/75 Heading C1C [Also in Division C3] In the pufication of sour water feed streams salts of weak acids and weak bases are removed by contacting with a water-in-oil emulsion comprising (1) as the oil phase (a) 1-40% of a sulphonated polymer having a substantially non-aromatic backbone, a MW of at least 1000 and 0À25-20 mole per cent sulphonic acid groups or a copoly mer of at least 25 weight per cent ethylene with a vinyl alkanoate having a MW of 500-100,000 and 1-20 carbon atoms in the alkanoate group and (2) an interior water phase containing acid, alkali or other reagent, such that the weak base permeates the exterior phase and is converted in the interior phase to impermeable form, and removing the weak acid from the stream by passing an inert gas therethrough or by subjecting the stream to subatmospheric pressure. In examples ammonium sulphide is removed by treating with compositions comprising aqueous sulphuric acid dispersed in isoparaffinic hydrocarbon solutions of sulphonated butyl rubber, sulphonated ethylene/propylene/ethylidene norbornene terpolymers and ethylene/vinyl acetate copolymers, and blowing with steam. The sulphuric may be replaced by polyacrylic, glutaric, succinic or phosphoric acid. |
