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Abstract

The invention concerns a process for converting a stream of natural or associated gas into liquid fractions, comprising:

a) a step for converting said stream of gas into a synthesis gas SG;b) a step FT for Fischer-Tropsch synthesis to convert the SG into liquid fractions;c) a step for fractionating the effluents from the Fischer-Tropsch synthesis into at least one relatively heavy fraction comprising waxes with a boiling point of 565° C. or more and at least one relatively light fraction;d) a step HCKI for isomerization hydrocracking of the relatively heavy fraction, in which at least 75% by weight of the fraction of the feed with a boiling point of more than 565° C. is converted into compounds boiling below 565° C.;e) at least one step for mixing at least the effluents from step HCKI (step d)), the light fraction from step c) and a crude oil P, to thereby produce an oil P*.

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First Claim