US 6,783,661 B1 · Process for producing oils with a high viscosity index

Abstract

A process for producing oils with high viscosity indices from oil distillates or effluents from a conversion unit comprises the following steps: a) catalytic hydrotreatment of the feed in the presence of hydrogen and a non zeolitic catalyst; b) fractionation of at least a portion of the effluent from step a) or step d) described below to an oil residue; c) fractionation by thermal diffusion of at least a portion of the oil residue obtained from step b) into oil fractions with different compositions and viscosity indices. Step b) can be preceded by a step d) for hydrocracking the effluent obtained from step a) in the presence of hydrogen and a zeolitic catalyst.

Claims20

Dependent claims

A process for producing oils with a high viscosity index from a feed containing constituents with boiling points of more than about 300° C. comprising

a) reacting hydrogen with the feed or with a mixture of the feed with at least a fraction of a stream recycled from c), in the presence of a catalyst comprising at least one amorphous non zeolitic matrix and at least one metal or compound of a metal from group VIII of the periodic table and/or at least one metal from group VIB to produce an effluent;
b) fractionating at least a portion of the liquid effluent obtained from a) so as to separate at least one oil residue comprising mainly constituents with viscosity indices which are higher than that of the feed;
c) fractionating at least a portion of the oil residue obtained in b) by thermal diffusion into oil fractions with high viscosity indices and separating the oil fractions in accordance with their viscosity index, and
recycling at least part of at least one fraction with low viscosity index from c) to a).

1 more element

Dependencies are inferred from the claim text.

Process for producing oils with a high viscosity index

Life of this patent

Process for producing oils with a high viscosity index

Life of this patent

Abstract

Claims20