Countercurrent continuous reforming method

Abstract

The invention discloses a countercurrent continuous reforming method which comprises the following steps: (1) introducing naphtha into a continuous reforming reaction device, separating a reforming reaction product by using a gas-liquid separator, further performing light hydrocarbon separation, performing distillation separation on C6<+> generated oil after olefin removal, performing aromatic hydrocarbon separation on obtained C6 and C7 fractions, and discharging a C8<+> fraction out of the device; (2) performing adsorption separation on a C6 non-aromatic component obtained through aromatic hydrocarbon separation, discharging separated isoparaffin and cycloalkanes out of the device, mixing C6 n-alkanes and other non-aromatic components obtained through aromatic hydrocarbon separation, feeding the mixture into a tail reactor, performing a reaction, and returning a reaction product flowing out from the tail reactor to a reforming gas-liquid separator; and (3) firstly, introducing a regenerated catalyst of a regeneration system of a reforming device into the tail reactor, enabling the catalyst to pass through reactors in serial connection in a countercurrent form, and further returning the catalyst to a regenerator. By adopting the method, the carbon accumulation rate of the catalyst of a last reactor in the reforming device can be reduced, so that the yield of light aromatic hydrocarbons can be increased, and the octane value of reforming generated oil can be increased.

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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