(ZA9203236-A)      Prodn. of 4-7C isoparaffins per mol. from synthesis gas comprises:    (a) Synthesis of a heavy paraffins-contg. hydrocarbon mixt. over a Fischer-Tropsch catalyst; (b) conversion of at least part of the heavy paraffins-contg. hydrocarbon mixt. over a bifunctional isomerisation/hydrocracking catalyst under isomerisation/hydrocracking conditions; (c) sepn. of normal paraffins from at least part of the isoparaffins-containing product of step (b); (d) recycling at least part of the normal paraffins to step (b) and withdrawing 4-7C isoparaffins as a prod. from the process.    (US5292983-A)      Prodn. of 4-7C-isoparaffins from synthesis gas, comprises the steps (a) synthesising a heavy paraffins-contg. hydrocarbon mixt. over a Fischer-Tropsch catalyst; (b) converting at least part of the heavy paraffins-contg. hydrocarbon mixt. over a bifunctional isomerisation/hydrocracking catalyst comprising at least one catalytically active metal e.g. metals of Groups VIB, VIIB, VIII and their mixts. and a zeolite having a pore dia. of 0.5 to 1.0 nm and a silica:alumina ratio of 5-200 under isomerisation/hydrocracking conditions; (c) sepg. normal paraffins from at least part of the isoparaffins-contg. prod. of step (b); and (d) recycling at least part of the normal paraffins to step (b) and withdrawing 4-7C isoparaffins as a prod. from the process.    USE -   The process produces iso-paraffins in an efficient manner.    (EP512635-B2)      A process for the prodn. of isoparaffins having 4-7 C atoms per molecule from synthesis gas is claimed, comprising: (a) synthesis of a heavy paraffins-contg. hydrocarbon mixt. over a Fischer-Tropsch catalyst; (b) conversion of at least part of the heavy paraffins-contg. hydrocarbon mixt. over a bi-functional isomerisation/hydrocracking catalyst under isomerisation/hydrocracking conditions; (c) sepn. of normal paraffins from at least part of the iosparaffins-contg. prod. of step (b); (d) recycling at least part of the normal paraffins to step (b) and withdrawing C4-C7 isoparaffins as a prod. from the process. Hydrocarbon mixts. produced by the above method are also claimed.    The catalyst in (a) pref. comprises cobalt, pref. 3-60 pbw cobalt and 0.1-100 pbw of at least one other metal selected from zirconium, titanium, rhenium, ruthenium and chromium, per 100 pbw silica, alumina, silica-alumina and/or titania. Step (a) is pref. carried out at 125-350 deg. C, 5-100 bar. The catalyst in (b) pref. comprises zeolite and a catalytically active metal component, pref. comprising at least one metal from Gp. VIB, VIIB or VIII, pref. at least one of Mo, W, Re, Fe, Ni, Co, Ru, Rh, Pd, Os, Ir and Pt. The zeolite pref. has pore dia. 0.5-1.0 nm and silica:alumina ratio 5-200; it is pref. zeolite Y, zeolite beta, mordenite or ZSM-20. Step (b) is pref. carried out at 250-450 deg. C, 5-50 bar, 0.2-20 kg hydrocarbon feed/kg of catalyst per hr and 1-50 hydrogen/hydrocarbon feed molar ratio. In (c) at least part of the effluent of (b) is pref. contacted with a separatory molecular sieve capable of adsorbing normal hydrocarbons. The sieve pref. has pore dia 0.3-0.8 nm, more pref. 0.4-0.6 nm.    USE/ADVANTAGE -   The invention provides a process for the prodn. of C4-C7 isoparaffins in high yield from synthesis gas. Such isoparaffins have particular use in gasoline blending.