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Method for lowering olefine content in gasoline in secondary processing

A secondary processing, olefin content technology, applied in hydrotreating process, petroleum industry, treatment of hydrocarbon oil, etc., to achieve the effect of small octane loss, more operational flexibility, and high gasoline yield

Active Publication Date: 2012-05-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the octane number of products is mainly achieved by increasing the content of toluene and xylene in the product, but the increasingly stringent environmental protection requirements also have strict restrictions on aromatics in gasoline. Therefore, in the long run, it is necessary to increase the content of aromatics in gasoline octane rating is not desirable

Method used

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  • Method for lowering olefine content in gasoline in secondary processing
  • Method for lowering olefine content in gasoline in secondary processing
  • Method for lowering olefine content in gasoline in secondary processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The properties of the raw materials used in Example 1 are shown in Table 1. The raw material oil A and hydrogen are successively contacted with hydrogenation protecting agent I, hydrogenation protecting agent II and hydrogenation protecting agent III in the first hydrogenation unit to remove most of the diolefins in the raw material. The hydrogenation process conditions and product properties are shown in Table 2. It can be seen from Table 2 that after the first hydrogenation unit, the diene value of the product is less than 0.2gI / 100g, and the stability of gasoline is greatly improved.

Embodiment 2

[0040] The product obtained in Example 1 was subjected to fractional distillation with 90° C. as the fractionation point, wherein the mass ratio of the heavy fraction was 60% by weight. The light distillate is not treated; the heavy distillate and hydrogen are sequentially contacted with a hydrofinishing agent and an octane number recovery catalyst, and are hydrogenated and upgraded under the reaction conditions of a hydrogen partial pressure of 3.2MPa and a reaction temperature of 375°C. The hydrogenated heavy fraction is mixed with the light fraction to obtain gasoline products. The process conditions of heavy fraction hydrogenation and the properties of whole fraction products are shown in Table 2. It can be seen from Table 2 that the olefin content decreased from 55.9% by volume to 24.2% by volume, and the product RON lost 1.2 units.

Embodiment 3

[0042] The product obtained in Example 1 was subjected to fractional distillation with 80° C. as the fractionation point, wherein the mass ratio of the heavy fraction was 68% by weight. The light distillate is not treated; the heavy distillate and hydrogen are sequentially contacted with a hydrofinishing agent and an octane number recovery catalyst, and are hydrogenated and upgraded under the reaction conditions of a hydrogen partial pressure of 3.2MPa and a reaction temperature of 380°C. The hydrogenated heavy fraction is mixed with the light fraction to obtain gasoline products. The process conditions of heavy fraction hydrogenation and the properties of whole fraction products are shown in Table 2. It can be seen from Table 2 that the olefin content decreased from 55.9% by volume to 17.8% by volume, and the product RON lost 1.5 units.

[0043] Table 1

[0044] raw material name

A

Density (20℃), g / cm 3

0.7474

Diene value, gI / 100g

...

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Abstract

The invention discloses a method for lowering olefine content in gasoline in secondary processing. In a first hydrogenation unit, alkadiene is selectively removed from gasoline raw materials; reaction effluent is led into a fractionation unit to be cut so as to obtain light fraction and heavy fraction, wherein, hydrodesulfurization, hydrodenitrogenation, olefin saturation and octane number preservation are carried out on the heavy fraction in a second hydrogenation unit, and obtained light hydrogenation fraction and heavy hydrogenation fraction are mixed to obtain gasoline products. The invention can process MTO gasoline and MTP gasoline, and produces high-quality gasoline which has low sulfur and low alkene and contains less than 25 volume% of olefine, and has smaller octane number loss and higher gasoline yield. The invention can provide more flexibility of operation to chemical devices, and improves the additional value of device products.

Description

technical field [0001] The present invention belongs to a method for refining hydrocarbon oil in the presence of hydrogen, more specifically, a method for reducing the olefin content in secondary processed gasoline. Background technique [0002] In order to distinguish it from straight-run gasoline obtained by atmospheric and vacuum distillation, gasoline fractions obtained by other processing methods are collectively referred to as secondary processed gasoline, such as catalytic cracking gasoline and coking gasoline, etc. are secondary processed gasoline. The secondary processed gasoline described in the present invention is mainly the by-product gasoline of methanol to olefins, involving gasoline fractions produced by the two important new processes of methanol to olefins (MTO) and methanol to propylene (MTP). [0003] Ethylene and propylene are important basic organic chemical raw materials. The current common technology is: ethylene is mainly obtained by steam cracking o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G65/06
Inventor 习远兵胡志海屈锦华董建伟李明丰
Owner CHINA PETROLEUM & CHEM CORP
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