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Gasoline hydro-desulfurization method

A hydrodesulfurization and gasoline hydrogenation technology, applied in the field of gasoline hydrodesulfurization, can solve the problem of high loss of olefins in products, and achieve the effects of small loss of octane number, high desulfurization rate and high operation flexibility

Active Publication Date: 2013-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the C6 and C7 fractions rich in olefins in the heavy fraction will still cause a large loss of product olefins after multi-stage hydrogenation reaction

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0028]Among them, the preferred method for preparing the selective hydrogenation catalyst comprises: a) preparing an alumina carrier containing at least one selected from a δ or θ structure; b) impregnating the carrier prepared in step a) with a boron-containing aqueous solution, and drying 1. Calcining to prepare boron-surface-modified alumina carrier, the drying temperature is 90-250°C, the drying time is 0.5-12 hours, the calcination temperature is 400-700°C, and the calcination time is 0.5-14 hours; c) using at least An aqueous solution of a compound of Group VIB and at least one hydrogenation active metal component of Group VIII is impregnated separately or simultaneously with the boron-surface-modified alumina support prepared in step b), and the catalyst is obtained by drying, and the drying temperature It is 90-230 ℃, and the drying time is 1-24 hours; calculated as oxide and based on catalyst, the amount of each component is such that the content of Group VIB metal com...

Embodiment 1

[0045] Using the gasoline raw material in Comparative Example 1, the gasoline raw material fractionation cutting and the light gasoline fraction alkali elution of mercaptan are the same as in Comparative Example 1.

[0046] process such as figure 2 As shown, the heavy gasoline fraction obtained by cutting the gasoline raw material is subjected to two-stage hydrogenation, and the two-stage hydrogenation reactors are filled with RSDS-1 (produced by Sinopec Catalyst Changling Branch) catalyst. There is no reboiler at the bottom of the middle fractionation column, and H 2 Stripping, the C6-C7 fraction is distilled from the top of the tower. The hydrogenation process conditions and product properties are shown in Table 2. Intermediate Fractionator Stripping H 2 The volume ratio of feed heavy gasoline is 10-50Nm 3 / m 3 , its operating conditions and product properties are shown in Table 2. Mixing dehydrogenation of second-stage hydrogenation tail oil and intermediate fraction...

Embodiment 2

[0057] Using the gasoline raw material in Comparative Example 1, the gasoline raw material fractionation cutting and the light gasoline fraction alkali elution of mercaptan are the same as in Comparative Example 1.

[0058] process such as figure 1As shown, the heavy gasoline fraction was subjected to two-stage hydrogenation, and the catalyst was the same as in Comparative Example 2. The middle fractionation column is heated by a bottom reboiler, and the C6-C7 fraction is distilled from the top of the column. The hydrogenation process conditions are shown in Table 2. The operating conditions and product properties of the middle fractionation tower are shown in Table 3. Mixing dehydrogenation of second-stage hydrogenation tail oil and intermediate fractionation overhead liquid phase product 2 The properties of the gasoline product obtained by blending S with the light fraction after alkali refining are listed in Table 5.

[0059] Compared with the comparative example, using...

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Abstract

The invention relates to a gasoline hydro-desulfurization method comprising the steps that: (1) a gasoline raw material is fractionated into a light gasoline fraction and a heavy gasoline fraction; mercaptan in the light gasoline fraction is removed; (2) in a first-stage hydrogenation reactor, the heavy gasoline fraction contacts a selective hydro-desulfurization catalyst, and is subjected to a reaction with hydrogen, such that sulfide in the fraction is removed; (3) the hydro-desulfurized heavy gasoline fraction obtained in the step (2) is introduced into an intermediate fractionation tower; H2S-containing hydrogen-rich gas is recovered from the tower top; C6-C7-rich heavy gasoline light components are recovered from the tower top; heavy gasoline heavy components higher than C7 are led out from the bottom of the intermediate fractionation tower; and (4) in a second-stage hydrogenation reactor, the heavy gasoline heavy components from the bottom of the intermediate fractionation tower contact a hydrogenation catalyst, and is subjected to a reaction with H2, such that deep desulfurization is carried out; after desulfurization, the heavy gasoline heavy components are mixed with the mercaptan-removed light gasoline fraction in the step (1) and the C6-C7-rich heavy gasoline light components, such that a desulfurized gasoline product is obtained. With the method provided by the invention, a gasoline product with a sulfur content lower than 20mug / g or even 10mug / g can be obtained. Also, an octane number loss is small. An RON loss is less than 2.0.

Description

technical field [0001] The present invention relates to a method for refining hydrocarbon oils in the presence of hydrogen, more particularly to a method for hydrodesulfurization of gasoline. Background technique [0002] As people's awareness of environmental protection continues to increase, the specifications of motor gasoline indicators such as oxygen content, vapor pressure, benzene content, total aromatics content, boiling point, olefin content and sulfur content will become more and more stringent, especially sulfur content. The National IV gasoline standard currently implemented in China requires the sulfur content to be less than 50 μg / g and the mercaptan content to be less than 10 μg / g. The content of total sulfur and mercaptan sulfur is also required to be further reduced. [0003] FCC gasoline is the main blending component in the gasoline blending pool in my country, and hydrodesulfurization method is generally used to remove sulfide in FCC gasoline. Although ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00
Inventor 毛俊义袁清褚阳金欣习远兵张占柱黄涛秦娅
Owner CHINA PETROLEUM & CHEM CORP
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