Non-hydrogenation aromatization upgrading method for naphtha

Abstract

The invention relates to a method for reforming naphtha non-hydrogasification aromatization, which comprises the following steps: naphtha contacts with reforming catalyst to perform the aromatization reforming reaction under the condition of non-hydrogasification, the obtained reforming product contacts with sorbent and adsorbs naphthaline series compound therein, and then strippant is used for desorbing the naphthaline series compound adsorbed in the sorbent, the strippant is separated from the naphthaline series compound by fractionation separation, and the sorbent comprises 55-80 percent of lithium by mass and / or sodium modified faujasite and 20-45 percent of caking agent by mass. The method can effectively remove heavy components in the aromatization reforming liquid product, lowers the end point of distillation and can obtain the naphthaline series compound with higher purity.

Description

technical field [0001] The invention relates to a method for non-hydroaromatization modification of naphtha, in particular to a method for improving the properties of a liquid product of non-hydroaromatization modification of naphtha. Background technique [0002] At present, FCC gasoline accounts for about 80% of my country's finished gasoline, and the olefin content of conventional FCC gasoline is as high as 50-55%. Content ≯35% standard. Therefore, the production of clean gasoline blending components with high octane number and low olefin content has become an urgent need for refineries. At present, the method of producing high-octane clean gasoline blending components in my country is mainly catalytic reforming. Due to the shortage of raw materials, many catalytic reforming units cannot operate at full capacity. [0003] In recent years, due to the discovery of ZSM-5 shape-selective zeolite, naphtha and / or low-carbon hydrocarbons can be converted into gasoline blending ...

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Problems solved by technology

[0013] The method of the present invention takes naphtha or naphtha and mixed carbon four as raw materials, carries out aromatization modification, and then adsorbs the modified gasoline with the adsorbent described in the present invention to remove the carbon dioxide in the modified gasoline. High boiling point products, thereby greatly reducing the dry point of aromatized gasoline, especially after the naphtha is mixed with mixed carbon four for aromatization, it can effectively solve the problem of heavy components in the obtained modified gasoline. The problem of excessively high final boiling point caused by the excessive use of carbon four fractions can not only improve the quality of modified gasoline, but also obtain gasoline products that meet national standards, thereby reducing the pollution caused by automobile exhaust. Naphthalene series compounds used in the production of chemical products such as phthalic anhydride, synthetic resin, and plant growth hormone can be obtained

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