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The deep conversion of oil residues may necessitate the use of hydroconversion in the presence of a suspended catalyst which should be recycled because of economic reasons. The tangential filtration, derived from ultrafiltration, is one of the solutions enabling catalyst separation and recycling. The aim of the present contract consists of catalyst characterisation and its physical (granulometry, specific surface) and chemical (residual activity and composition) evolution, as well as the study of the behaviour of the treated membranes for this separation (percentage of rejection, filtration output, risk of plugging). Several membranes have been selected; the optimal pore diameter to provide a sufficient output, a high percentage of rejection and limited plugging lies in the range between 250 and 500 Angstroms. The catalyst is in the form of MoS(2), very dispersed and probably linked to a carbonated phase of asphaltenic nature. The tests performed enabled the selection of a type of membrane well adapted to catalyst separation. The tests, carried out on diluted charge because of operational problems with the plant, have shown the need for making the catalyst separation by tangential ultrafiltration at high temperatures on the real effluent from the catalytic hydroconversion in order to demonstrate industrial feasibility.

Additional information

Authors: BUISSON A, Rueil-Malmaison (FR);MOREL F, Rueil-Malmaison (FR);PERIES J-P, Rueil-Malmaison (FR)
Bibliographic Reference: EUR 14423 FR (1993) 109 pp.
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