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Method for removing mercaptan from gasoline

A technology for removing mercaptan and gasoline, which is applied in the field of refined hydrocarbon oil and can solve problems such as loss of octane number of products

Active Publication Date: 2014-08-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Although countercurrent hydrodesulfurization can avoid the formation of new mercaptans, due to the high content of olefins in gasoline, some olefins will still be saturated in the process of hydrodesulfurization, resulting in a loss of product octane number

Method used

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  • Method for removing mercaptan from gasoline
  • Method for removing mercaptan from gasoline

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Experimental program
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Effect test

Embodiment 1

[0028] The fixed bed reactor is filled with a Raschig ring RSS-1A catalyst with a diameter of 2 mm. Using FCC gasoline A as the raw material, it is directly introduced into the upper part of the fixed bed reactor without alkali washing, N 2 The gas is introduced from the bottom of the reactor, and the gas-liquid two-phase is in countercurrent contact on the catalyst, and the reaction is carried out under the conditions of a pressure of 1.4Mpa and a temperature of 200°C, and the volume space velocity of the feed material is 5h -1 , the feed gas / oil volume ratio is 25 (standard state), and the sweetened gasoline product is drawn from the bottom of the reactor, and its properties are shown in Table 1.

Embodiment 2

[0030] The stripping tower is filled with a Raschig ring RSS-1A catalyst with a diameter of 3mm, using catalytically cracked gasoline A as the raw material, which is directly introduced into the upper part of the stripping tower without alkali washing, N 2 The gas is introduced from the bottom of the stripping column, and the steam generated by the reboiler in the column passes upward through the catalyst bed. After the steam at the top of the stripping tower is condensed, the liquid phase is completely refluxed, and the non-condensable gas N 2 The gasoline fraction after sweetening is discharged from the bottom of the tower. The operating pressure of the stripper is 2.4MPa, the average temperature of the catalyst bed is 260°C, and the volumetric space velocity of the feed is 8h -1 , feed N2 The gas / oil volume ratio is 5 (standard state), and the properties of gasoline products after sweetening are shown in Table 1.

[0031] Table 1

[0032]

[0033] As can be seen from ...

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Abstract

The invention discloses a method for removing mercaptan from gasoline. The method comprises that: raw materials are introduced from the top of a reactor, flow through the reactor from top to bottom, and are in contact with a mercaptan-removing catalyst filled in the reactor under certain operation condition; the mercaptan in the raw materials is decomposed into olefin and hydrogen sulfide gas; a steam stripping medium is introduced into the bottom of the reactor and is in countercurrent contact with the gasoline so as to remove the produced hydrogen sulfide gas from the reaction zone timely; the steam stripping medium containing the hydrogen sulfide gas is discharged from the top of the reactor; and a gasoline product from which the mercaptan is removed is led out of the bottom of the reactor, wherein the steam stripping medium is an inert gas and / or steam. By using the method, one gram of gasoline product produced by the method contains less than 3 micrograms of mercaptan sulfur, the total sulfur content of the gasoline product is reduced, and octane number loss is avoided.

Description

technical field [0001] The present invention relates to a method of refining hydrocarbon oils in the absence of hydrogen. More specifically, it is a method of removing mercaptans from gasoline to produce low-sulfur gasoline in the absence of hydrogen. Background technique [0002] With the increasingly stringent environmental protection regulations, countries around the world have put forward stricter restrictions on the composition of engine fuels such as sulfur content, vapor pressure, benzene content, total aromatics content, and olefin content, among which the sulfur content in gasoline is particularly strict. my country plans to upgrade the quality of motor gasoline to the National III standard on December 31, 2009, requiring that the sulfur content of gasoline should not exceed 150 μg / g. Beijing has taken the lead in implementing the National IV emission standard in 2008, requiring the sulfur content of gasoline to be further reduced to below 50 μg / g. [0003] FCC ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/04C10G29/16
Inventor 毛俊义李明丰张占柱黄涛褚阳袁清
Owner CHINA PETROLEUM & CHEM CORP
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