(JP10500168-W)      A liquid medium (I) comprising a phase (a) and a phase (b) is separated by contact with a filter which has been wetted with a wetting agent miscible with (a) but immiscible with (b), to obtain a filtrate (F) comprising (a) and substantially free of (b). Reaction conditions in a multiple phase liquid reactor are controlled by treating the effluent as (I) above, and subjecting (F) to an analyser. A multiple phase liquid medium (II) comprising a liquid fossil fuel (A), an aq. phase (B) and a biocatalyst (C) is separated by (i) contacting (II) with a filter wetted with a wetting agent (W1) miscible with (A) but immiscible with (B) to obtain a filtrate of (A), and a retentate; and (ii) contacting the retentate with a second filter wetted with a wetting agent (W2) miscible with (B) but immiscible with (A), to obtain a filtrate of (B) and a final retentate. In an alternative procedure, (II) is first contacted with a filter wetted with (W2) to obtain a filtrate of (B), and the retentate is contacted with a filter wetted with (W1) to obtain a filtrate of (A) and a final retentate.    USE -   (I) and (II) are generally emulsions or micro-emulsions. (II) is obtained esp. from a fossil fuel desulphurisation process.    ADVANTAGE -   The emulsions are resolved more completely and efficiently than by conventional methods, using, e.g., conventional separators, coalescers or electrical precipitators.    (GB2302333-B)      A liquid medium (I) comprising a phase (a) and a phase (b) is separated by contact with a filter which has been wetted with a wetting agent miscible with (a) but immiscible with (b), to obtain a filtrate (F) comprising (a) and substantially free of (b). Reaction conditions in a multiple phase liquid reactor are controlled by treating the effluent as (I) above, and subjecting (F) to an analyser. A multiple phase liquid medium (II) comprising a liquid fossil fuel (A), an aq. phase (B) and a biocatalyst (C) is separated by (i) contacting (II) with a filter wetted with a wetting agent (W1) miscible with (A) but immiscible with (B) to obtain a filtrate of (A), and a retentate; and (ii) contacting the retentate with a second filter wetted with a wetting agent (W2) miscible with (B) but immiscible with (A), to obtain a filtrate of (B) and a final retentate. In an alternative procedure, (II) is first contacted with a filter wetted with (W2) to obtain a filtrate of (B), and the retentate is contacted with a filter wetted with (W1) to obtain a filtrate of (A) and a final retentate.    USE -   (I) and (II) are generally emulsions or micro-emulsions. (II) is obtained esp. from a fossil fuel desulphurisation process.    ADVANTAGE -   The emulsions are resolved more completely and efficiently than by conventional methods, using, e.g., conventional separators, coalescers or electrical precipitators.    (CN1150445-A)      A liquid medium (I) comprising a phase (a) and a phase (b) is separated by contact with a filter which has been wetted with a wetting agent miscible with (a) but immiscible with (b), to obtain a filtrate (F) comprising (a) and substantially free of (b). Reaction conditions in a multiple phase liquid reactor are controlled by treating the effluent as (I) above, and subjecting (F) to an analyser. A multiple phase liquid medium (II) comprising a liquid fossil fuel (A), an aq. phase (B) and a biocatalyst (C) is separated by (i) contacting (II) with a filter wetted with a wetting agent (W1) miscible with (A) but immiscible with (B) to obtain a filtrate of (A), and a retentate; and (ii) contacting the retentate with a second filter wetted with a wetting agent (W2) miscible with (B) but immiscible with (A), to obtain a filtrate of (B) and a final retentate. In an alternative procedure, (II) is first contacted with a filter wetted with (W2) to obtain a filtrate of (B), and the retentate is contacted with a filter wetted with (W1) to obtain a filtrate of (A) and a final retentate.    USE -   (I) and (II) are generally emulsions or micro-emulsions. (II) is obtained esp. from a fossil fuel desulphurisation process.    ADVANTAGE -   The emulsions are resolved more completely and efficiently than by conventional methods, using, e.g., conventional separators, coalescers or electrical precipitators.