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Method and system for gasoline desulfurization and aromatization

A technology for aromatization and gasoline, which is applied in the treatment of hydrocarbon oil, petroleum industry, hydrocarbon oil treatment products, etc., and can solve the problems of lowering octane number of gasoline products.

Active Publication Date: 2020-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent will process low-sulfur and low-olefin gasoline, but the octane number of gasoline products is expected to be reduced to a certain extent

Method used

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  • Method and system for gasoline desulfurization and aromatization
  • Method and system for gasoline desulfurization and aromatization
  • Method and system for gasoline desulfurization and aromatization

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Experimental program
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Effect test

Embodiment approach

[0055] A specific embodiment, based on the dry weight of the adsorption desulfurization catalyst and based on the weight of oxides, the zinc oxide in the adsorption desulfurization catalyst accounts for 10-90% by weight, and the silicon dioxide accounts for 5-85% by weight. %, aluminum oxide accounts for 5-30% by weight; based on the dry basis weight of the adsorption desulfurization catalyst and calculated by element weight, the content of the desulfurization active metal in the adsorption desulfurization catalyst is 5-30% by weight.

[0056] According to the present invention, the olefin aromatization catalyst refers to a catalyst capable of converting hydrocarbons such as olefins in gasoline raw materials into aromatics, generally including molecular sieves, preferably including molecular sieves, supports and metals, for example, on a dry basis and in terms of the olefins Based on the total weight of the aromatization catalyst, the olefin aromatization catalyst may contain 1...

specific Embodiment approach

[0057] A specific embodiment, the preparation process of the molecular sieve with MFI structure can include ammonia exchange, phosphorus modification, metal component modification and roasting treatment steps, more specifically, the molecular sieve with MFI structure obtained by conventional crystallization The sodium type molecular sieve according to the molecular sieve: ammonia salt: H 2 The weight ratio of O=1:(0.1-1):(5-10) is exchanged at room temperature to 100°C for 0.3-1 hour and then filtered to introduce phosphorus-containing compounds and selected from Fe, Co, Ni, Zn, Mn, Ga and one or more of Sn to modify the molecular sieve, and then calcined at 400-800° C. for 0.5-8 hours, wherein the calcining process can also be carried out under a water vapor atmosphere. Furthermore, for the molecular sieve with MFI structure provided by the present invention, the molecular sieve can be modified by impregnation or ion exchange during the preparation process. Further, the phos...

Embodiment 1

[0092] Such as figure 2 As shown, the top of catalytic cracking main fractionation tower 1 adopts a two-stage condensation cooling process, the operating temperature of the first-stage condenser 2 is about 65°C, and the heavy gasoline fraction HCN-A is separated, and the uncondensed gas phase flows through the second-stage condenser 4 After cooling to about 40°C, the light gasoline fraction LCN-A was obtained by separation. The properties of HCN-A and LCN-A are listed in Table 2. The heavy gasoline fraction HCN-A is sent to the first set of fluidized reactor 6 mixed with adsorption desulfurization catalyst FCAS and fresh aromatization catalyst OTAZ-C-3 (fresh aromatization catalyst OTAZ-C-3 is mixed with 7% by weight of the total weight of the catalyst) to contact and perform desulfurization and aromatization reactions in a hydrogen-facing state, and the reaction conditions are listed in Table 5. The reaction product obtained from the top of the reactor is cooled and separa...

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Abstract

The invention relates to a method and system for desulfurization and aromatization of gasoline. The method comprises the following steps: subjecting a raw gasoline material to cutting so as to obtaina light gasoline fraction and a heavy gasoline fraction; conveying the heavy gasoline fraction into a first set of fluidization reactor for contacting with a mixed catalyst and carrying out desulfurization and aromatization in the presence of hydrogen so as to obtain a desulfurization and aromatization product, wherein the mixed catalyst comprises an adsorption desulfurization catalyst and an olefin aromatization catalyst; and conveying the light gasoline fraction into a second set of fluidization reactor for contacting with the adsorption desulfurization catalyst and carrying out a desulfurization reaction so as to obtain a second desulfurization product. The method and system provided by the invention can reduce the contents of sulfur and olefins in gasoline, decrease the octane number loss of the gasoline and maintain high gasoline yield.

Description

technical field [0001] The invention relates to a gasoline desulfurization and aromatization method and system. Background technique [0002] Air pollution caused by vehicle exhaust emissions is becoming more and more serious. As people pay more and more attention to environmental protection, my country has accelerated the pace of upgrading the quality of vehicle fuel. The national standard GB17930-2013 requires that the sulfur content in gasoline should not exceed 10 μg / g, and the olefin volume fraction should not exceed 24%. [0003] FCC gasoline is the main component of motor gasoline in my country, accounting for about 75% in the gasoline pool, and its characteristic is that it has high olefin and sulfur content. It is not difficult to use hydrogenation technology to achieve deep desulfurization of gasoline and reduce the olefin content in FCC gasoline, but since olefin is a high-octane component, a large reduction in its content will lead to a serious loss of gasoline ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
CPCC10G67/00C10G2300/1037C10G2300/202C10G2300/70C10G2400/02
Inventor 许友好王新徐莉于敬川汪燮卿
Owner CHINA PETROLEUM & CHEM CORP
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