A kind of upgrading method of catalytic cracking gasoline

Abstract

The invention relates to a modification method of catalytic gasoline. Under the effect of a pre-hydrogenation catalyst, sulfur alcohol etherification and double bond isomerism reactions are carried out on gasoline through a pre-hydrogenation reactor, an effluent of a pre-hydrogenation reaction is cut and fractionated into light and weight components, an isomerism reaction is carried out on the light component under the effect of an isomerism catalyst, the heavy component enters a desulfuration-octane value recovery reactor, a hydrogen desulfurization-isomerism catalyst and an octane value recovery catalyst are loaded inside the reactor, the heavy component is firstly in contact with the hydrogen desulfurization-isomerism catalyst, a selective hydrogen desulfurization-isomerism reaction iscarried out under the effect of the hydrogen desulfurization-isomerism catalyst, and simultaneously, straight chain olefin is isomerized into single branched chain olefin or single branched chain paraffin; the heavy component after the reaction is then in contact with the octane value recovery catalyst to carry out a double branched chain isomerism reaction; and finally the light and heavy fractions are blended to obtain a gasoline product with low olefin, ultra-low sulfur content and high octane value. The hydrogen desulfurization-isomerism catalyst and the octane value recovery catalyst arearranged inside the same reaction device, and the technology is simplified.

Description

technical field [0001] The invention relates to a method for upgrading catalytic cracking gasoline. Background technique [0002] FCC gasoline is a mixture composed of C4-C12 hydrocarbons and trace amounts of sulfides, oxides and metal arsenides. According to the differences in crude oil properties and processing routes of various refineries, FCC gasoline is composed of 18-55v% A mixture of olefins, 12-20v% aromatics and alkanes, the octane number characteristics of each component are aromatics>alkenes≈isoparaffins>alkanes. In my country, FCC gasoline with high sulfur content, high olefin content and low octane number accounts for about 70%, while the proportion of alkylated oil, isomerized oil and reformed oil with low sulfur content, low olefin content and high octane number This makes the cleanliness of FCC gasoline in my country need to carry the triple mission goals of desulfurization, olefin reduction and octane maintenance. [0003] CN201010224554.1 provides a ...

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Problems solved by technology

However, due to the different composition and content of specific gasoline raw materials, as well as different gasoline product standards, the gasoline upgrading process and catalysts used are also quite different.

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