A countercurrent continuous reforming method

Abstract

A countercurrent continuous reforming method, comprising: (1) introducing naphtha into a continuous reforming reaction device, the reforming reaction product is separated by a gas-liquid separator, and then separated by light hydrocarbons, and the obtained C 6 + After removing olefins, the resulting oil is subjected to rectification and separation, and the resulting C 6 、C 7 Fraction for aromatics separation, C 8 + Distillate discharge device, (2) the C obtained by separating aromatics 6 Adsorptive separation of non-aromatic components, separated isoparaffins and naphthenes discharge device, C 6 Normal paraffins and other non-aromatic components obtained from the separation of aromatics are mixed and then enter the tail reactor for reaction, and the reaction products flowing out from the tail reactor are returned to the reforming gas-liquid separator. (3) After the regeneration system of the reforming unit is regenerated The catalyst is first introduced into the tail reactor, then passed through each series of reactors in countercurrent, and then returned to the regenerator. This method can reduce the carbon deposition rate of the catalyst in the last reactor of the reforming unit, thereby increasing the yield of light aromatics and the octane number of the reformed oil.

Description

technical field [0001] The invention relates to a method for continuous reforming of naphtha, in particular to a method for continuous catalytic reforming of naphtha with catalyst countercurrent circulation. Background technique [0002] Catalytic reforming of naphtha is based on C 5 ~C 12 Hydrocarbon components are used as raw materials. Under certain operating conditions and the action of catalysts, hydrocarbon molecules are rearranged to convert alkanes or naphthenes in naphtha into aromatics or isomeric hydrocarbons to produce aromatics or high-octane gasoline components while by-producing hydrogen. [0003] In the traditional naphtha continuous catalytic reforming process, the reactants flow from the first reactor to the fourth reactor sequentially, and the regenerated catalyst first enters the first reactor, then passes through the second reactor, the third reactor, The fourth reactor, and then back to the regenerator. The flow direction of the reactant is consiste...

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Problems solved by technology

The main problem of this method is that naphtha undergoes high-temperature reforming reaction at a temperature above 540°C. In order to avoid coking of the device, a specially manufactured reactor with an inner wall coated with anti-coking material is required. In order to reduce the cracking reaction, high-temperature reforming The reactor is preferably filled with a catalyst with low acidity or weak acidity, and the heterogeneous C in the non-aromatic raffinate 6 Alkanes returned to the high-temperature reformer not only cannot be converted into aromatics, but also undergo cracking reactions to generate liquefied gas to reduce C 5 Yield of the above gasoline components

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