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Method for upgrading the quality of high olefin catalytic cracking gasoline

A technology for catalytic cracking of gasoline and high olefins, applied in the treatment of hydrocarbon oil, hydrocarbon oil treatment products, petroleum industry, etc., can solve the problems of high octane number loss, insignificant and small effect, and most of them still need hydrotreating.

Active Publication Date: 2020-02-14
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, S-zorb is used for the desulfurization of full fraction catalytic gasoline. The sulfur content of gasoline after desulfurization can be controlled below 10ppm, but the loss of octane number of full fraction gasoline is 1.0-2.0 units; RSDS technology first cuts catalytic gasoline into light and heavy Fractions, light fractions are extracted and sweetened, and heavy fractions are selectively hydrodesulfurized. When producing products with a sulfur content of less than 10ppm, the output of light fractions is about 20%, and most of them need hydrogenation. The octane number of full-distillate gasoline The loss is between 3.0-4.0; Prime-G+ adopts the process flow of pre-hydrogenation of whole fraction, splitting of light and heavy gasoline, and selective hydrodesulfurization of heavy fraction. Although some low-sulfur light components do not need hydrotreating, the yield of light components Fewer, most still require hydrotreating, resulting in octane losses between 3.0-4.0 for full distillate gasoline
[0008] When existing technologies for reducing the sulfur content of catalytic cracking gasoline meet the requirements of deep desulfurization, there are generally problems such as large proportion of hydrotreating, large loss of octane number, uncoordinated olefin reduction and sulfur reduction; even with some octane recovery processes Combined, the effect is not obvious

Method used

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  • Method for upgrading the quality of high olefin catalytic cracking gasoline
  • Method for upgrading the quality of high olefin catalytic cracking gasoline
  • Method for upgrading the quality of high olefin catalytic cracking gasoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 1. Preparation of aromatization catalyst

[0073] 1) Preparation of catalyst precursor

[0074] At room temperature, the nanoscale HZSM-5 molecular sieve with a silicon-aluminum ratio of 25 and pseudo-boehmite were physically mixed in a ratio of 4:1 to obtain a catalyst precursor.

[0075] 2) Ion exchange modification

[0076] The catalyst precursor was ion-exchanged by the constant temperature water bath method, specifically, sodium hydroxide was dissolved in deionized water, mixed with the catalyst precursor and placed in a water bath at 90°C for 2 hours, so that the loading capacity of sodium was about 0.2 % by weight, followed by drying at about 120°C for about 8 hours and firing at about 540°C for about 4 hours.

[0077] 3) The first modification treatment

[0078] Using the equal-volume impregnation method, the first modification treatment is carried out on the catalyst precursor treated by ion exchange, specifically, dissolving ammonium dihydrogen phosphate in d...

Embodiment 2

[0095] 1. Preparation of aromatization catalyst

[0096] 1) Preparation of catalyst precursor

[0097] At room temperature, the nanoscale HZSM-5 molecular sieve with a silicon-to-aluminum ratio of 25 and pseudo-boehmite were physically mixed at a ratio of 9:1 to obtain a catalyst precursor.

[0098] 2) Ion exchange modification

[0099] The catalyst precursor was ion-exchanged by using a constant temperature water bath method, specifically dissolving sodium hydroxide in deionized water, mixing it with the catalyst precursor, and stirring it in a water bath at 90°C for 2 hours, so that the loading capacity of sodium was about 0.5 % by weight, followed by drying at about 120°C for about 8 hours and firing at about 540°C for about 4 hours.

[0100] 3) The first modification treatment

[0101] Using an equal-volume impregnation method, carry out the first modification treatment on the ion-exchange-treated catalyst precursor, specifically dissolving lanthanum nitrate in deionize...

Embodiment 3

[0118] like figure 1 As shown, the method for upgrading the quality of high olefin catalytic cracking gasoline in this embodiment includes the following steps:

[0119] 1. Prehydrogenation

[0120] The composition of the high olefin catalytic cracking gasoline feedstock in this example is shown in Table 5.

[0121] Table 5 Composition of High Olefin Catalytic Cracking Gasoline Feedstock

[0122]

[0123] In the presence of a pre-hydrogenation catalyst, pre-hydrogenate the above-mentioned high-olefin catalytic cracking gasoline to obtain pre-hydrogenation catalytic cracking gasoline; wherein the pre-hydrogenation catalyst is Ni-Mo / Al 2 o 3 , which consists of (mass content%): Al 2 o 3 90.5%, Ni6%, Mo 3.5%; pre-hydrogenation process conditions: hydrogen partial pressure 2.2MPa, volume space velocity 3.0h -1 , the volume ratio of hydrogen to oil is 10:1, and the reaction temperature is 110°C.

[0124] After the above-mentioned prehydrogenation, the light sulfur compoun...

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Abstract

The invention provides a quality upgrading method for high olefin catalytic cracking gasoline. The method includes the steps of: conducting prehydrogenation on catalytic cracking gasoline to obtain prehydrogenated catalytic cracking gasoline; cutting the prehydrogenated catalytic cracking gasoline into light fraction, medium fraction and heavy fraction; conducting etherification or catalytic cracking on the light fraction; subjecting the medium fraction to solvent extraction to obtain olefin-rich raffinate oil and aromatic hydrocarbon-rich extracted oil; conducting light olefin recovery on theextracted oil to obtain light olefin and sulfur-rich oil; returning at least a part of the light olefin to the solvent extraction system for backwashing; conducting mitigated aromatization on at least one of the raffinate oil and the other part of the light olefin; and subjecting the heavy fraction and sulfur-rich oil to selective hydrodesulfurization, thus obtaining desulfurized heavy fraction.The method provided by the invention can improve the octane number of gasoline products while lowering the sulfur content and olefin content.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a method for upgrading the quality of high-olefin catalytic cracking gasoline. Background technique [0002] In recent years, with the increasingly heavy and inferior quality of petroleum resources and the increasing requirements for environmental protection, countries around the world have successively formulated strict new standards for clean gasoline. For example, the Euro V motor gasoline standard promulgated by the European Union in 2011 stipulates that the olefin content is below 18v%, the sulfur content is below 10ppm, and the octane number is maintained above 95; The gasoline standard requires the olefin content to be below 18v%, the sulfur content to be below 10ppm, and the octane number to be above 93. Therefore, the main manifestation of the improvement of gasoline quality standards is to reduce the olefin content and increase the octane num...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/04
CPCC10G67/0445C10G2300/1088C10G2300/202C10G2300/305C10G2400/02
Inventor 赵亮高金森郝天臻陈丰张宇豪王晓琴曹丽媛徐春明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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