| 摘要 |
PURPOSE: Process for the production of gasolines with improved octane number is provided, which has an improved octane value. CONSTITUTION: The process comprises the following stages : a) Conversion with simultaneous hydrotreatment of the paraffins in the charge; b) Separation of the isoparaffins from the petrol cut obtained and recovery of an effluent containing n-paraffins; c) Isomerisation of the effluent from (b) by contact with a catalyst containing a hydro-dehydrogenating metal an acid solid in the presence of hydrogen to produce an effluent containing isoparaffins of improved octane index; d) Catalytic de-paraffination of the residue with a catalyst comprising a molecular sieve with a microporous system consisting of channels with pore openings having 9 or 10 atoms T(T is Si, Al, P, B, Ti, Fe or Ga), alternating with an equal number of O atoms ; the distance between two pore openings accessible to 9 or 10 T atoms is no more than 0.75 nm and the product presents a ratio 2-methylnonane /5-methylnonane greater than 5 in the n-decane test.
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