1.
    发明专利
    失效

    公开(公告)号:JPH05238708A

    公开(公告)日:1993-09-17

    申请号:JP31740692

    申请日:1992-11-26

    申请人: HOECHST AG

    IPC分类号: C01B17/90 C01B17/92 C07F9/50

    摘要: Sulphuric acid containing dilute, organic phosphorus compounds and further impurities, which is produced, for example, in the preparation of sulphonated arylphosphines, is purified by extraction with an amine which is sparingly soluble or insoluble in water.

    METHOD FOR REGENERATING USED SULFURIC ACID

    公开(公告)号:JPH05139708A

    公开(公告)日:1993-06-08

    申请号:JP13110492

    申请日:1992-05-22

    申请人: TOPSOE HALDOR AS

    发明人: SCHOUBYE PETER

    摘要: Process for the regeneration of spent sulphuric acid from chemical processes, which process comprises the steps of evaporating and decomposing the spent sulphuric acid at a temperature of 400-800 DEG C with excess of air, to a gas mainly consisting of carbon dioxide, steam, nitrogen, oxygen, sulphur dioxide and sulphur trioxide together with minor amounts of ammonia, carbon monoxide, residual organic compounds and dust from solids in the spent acid; cooling the gas to 360-450 DEG C and oxidizing oxidizable components in the cooled gas by contact with an oxidation catalyst; cooling the oxidized gas to a temperature of 10-50 DEG C above the sulphuric acid dew point in the gas and condensing sulphuric acid formed in the cooled and oxidized gas.

    5.
    发明专利
    失效

    公开(公告)号:JPH0674121B2

    公开(公告)日:1994-09-21

    申请号:JP31740692

    申请日:1992-11-26

    IPC分类号: C01B17/90 C01B17/92 C07F9/50

    摘要: Sulphuric acid containing dilute, organic phosphorus compounds and further impurities, which is produced, for example, in the preparation of sulphonated arylphosphines, is purified by extraction with an amine which is sparingly soluble or insoluble in water.

    8.
    发明专利
    失效

    公开(公告)号:JPS50145392A

    公开(公告)日:1975-11-21

    申请号:JP4538775

    申请日:1975-04-16

    IPC分类号: C01B17/90 C01B17/92