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Catalytic cracking gasoline desulfurization method

A catalytic cracking gasoline and catalytic cracking technology, which is applied in the field of light hydrocarbon refining, can solve the problems of high energy consumption of the processing flow device, increase the cooling load of the device, and insufficient utilization of heat, and reduce the contact between the catalytic cracked gasoline and oxygen. Opportunities, the effect of reducing plant energy consumption and reducing plant investment

Active Publication Date: 2015-04-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process route is longer, and the energy consumption of the processing equipment is higher
The heat of the catalytic cracking process is relatively rich, and is usually used to generate the steam required by the refinery, but most of the heat below 300 ° C cannot be fully utilized, and the cooling load of the device is also increased.

Method used

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  • Catalytic cracking gasoline desulfurization method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] according to figure 1 The process flow shown processes FCC catalytic cracking gasoline to produce ultra-low sulfur clean gasoline.

[0053] After the FCC catalytic cracking reaction oil and gas are cooled by stages at the top of the main fractionation tower, light fractions and heavy fractions are obtained. The properties of the light and heavy fractions obtained at the top of the FCC catalytic cracking main fractionation tower are shown in Table 1.

[0054] Table 1 Properties of light and heavy fractions obtained from the top of FCC catalytic cracking main fractionator

[0055] project light ends heavy fraction Density (20℃), g / cm 3 0.6875 0.7394 Sulfur content, μg / g 122 683 RON 95.2 92.6 Distillation range (ASTM D 86), °C IBP / 10% 30 / 35 79 / 110 30% / 50% 40 / 51 127 / 141 70% / 90% 59 / 63 157 / 188 95% / FBP 71 / 76 203 / 210

[0056] The light fraction enters the non-alkali deodorization unit after the stabl...

Embodiment 2

[0070] according to figure 1 The process flow shown is to process MIP catalytic cracking gasoline to produce ultra-low sulfur clean gasoline.

[0071] After the MIP catalytic cracking reaction, oil and gas are cooled by stages at the top of the main fractionator, light fractions and heavy fractions are obtained. The properties of the light and heavy fractions obtained at the top of the MIP catalytic cracking main fractionator are shown in Table 6.

[0072] Table 6 Properties of light and heavy fractions at the top of MIP catalytic cracking main fractionator

[0073] project light ends heavy fraction Proportion,% 29.49 70.51 Density (20℃), g / cm 3 0.6772 0.7375 Sulfur content, μg / g 118 680 RON 95.6 92.8 Distillation range (ASTM D-86), ℃ IBP / 10% 30 / 35 80 / 109 30% / 50% 40 / 49 125 / 138 70% / 90% 57 / 62 153 / 185 95% / FBP 67 / 73 197 / 205

[0074] The light fraction enters the non-alkali deodorization unit afte...

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Abstract

The invention discloses a catalytic cracking gasoline desulfurization method. The method consists of: subjecting the effluent from a catalytic cracking main fractionating tower top to stepped cooling so as to obtain light fractions and heavy fractions, after stable absorption, subjecting the light fractions to alkali-free deodorization, letting the deodorized light fractions and catalytic diesel oil enter a disulfide fractionating tower together, thus obtaining light gasoline from the fractionating tower top and extracting medium gasoline from a fractionating tower middle lateral line, mixing the medium gasoline with the heavy fractions obtained from cooling, then passing the mixture through a hydrogenation protection reactor and a hydrodesulfurization reactor in order, subjecting the hydrogenated liquid product to gas stripping, and mixing the product with the refined light gasoline, thus obtaining a clean gasoline product or a blending component. The method provided in the invention not only can decrease the mercaptan sulfur content and the total sulfur content of catalytic cracking gasoline, produce a clean gasoline product with qualified sulfur and olefin content, but also can significantly reduce the energy consumption of production equipment and increase the economic benefits of a catalytic cracking gasoline desulfurization device.

Description

technical field [0001] The invention relates to a process for refining light hydrocarbons, more specifically a method for desulfurizing catalytic cracking gasoline, especially a method for reducing the mercaptan sulfur content of catalytic cracking gasoline and producing clean gasoline. technical background [0002] With the rapid development of the automobile industry and increasingly stringent environmental protection requirements, the production of low-sulfur and ultra-low-sulfur clean gasoline has become an inevitable trend in the development of the oil refining industry. Judging from the composition of my country's current gasoline pool, catalytic cracking gasoline components account for 75% to 80%. The sulfur content of catalytic cracking gasoline is usually 100~2000μg / g, and the contribution rate to the sulfur content in the gasoline pool in my country is the highest, reaching more than 98%. Moreover, as the feedstock processed by catalytic cracking develops toward a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
Inventor 张龙李经伟王岩高景山杨秀娜
Owner CHINA PETROLEUM & CHEM CORP