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Method for upgrading the quality of catalytically cracked gasoline

A catalytic cracking gasoline and quality technology, which is applied in the treatment of hydrocarbon oil, petroleum industry, hydrocarbon oil treatment products, etc., can solve the problems of insignificant effect, large proportion of hydrotreating, and high loss of octane number.

Active Publication Date: 2020-04-21
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 catalytically cracked gasoline
  • Method for upgrading the quality of catalytically cracked gasoline
  • Method for upgrading the quality of catalytically cracked gasoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] 1. Preparation of aromatization catalyst

[0075] 1) Preparation of catalyst precursor

[0076] At room temperature, the nanoscale HZSM-5 molecular sieve with a silicon-to-aluminum ratio of 25 and pseudo-boehmite were physically mixed in a ratio of 4:1 to obtain a catalyst precursor.

[0077] 2) Ion exchange modification

[0078] 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.

[0079] 3) The first modification treatment

[0080] 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...

Embodiment 2

[0098] 1. Preparation of aromatization catalyst

[0099] 1) Preparation of catalyst precursor

[0100] 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.

[0101] 2) Ion exchange modification

[0102] 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.

[0103] 3) The first modification treatment

[0104] 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

[0120] Such as figure 1 As shown, the method for upgrading the quality of FCC gasoline in the present embodiment comprises the following steps:

[0121] 1. Prehydrogenation

[0122] The composition of the catalytic cracking gasoline raw material in this embodiment is shown in Table 5.

[0123] Table 5 Composition of catalytic cracking gasoline feedstock

[0124]

[0125]

[0126] In the presence of a pre-hydrogenation catalyst, pre-hydrogenate the above catalytic cracked gasoline to obtain pre-hydrogenated catalytic cracked gasoline; wherein the pre-hydrogenation catalyst is Ni-Mo / Al 2 o 3 , which consists of (mass content%): Al 2 o 3 90.5%, Ni 6%, 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.

[0127] After the above-mentioned pre-hydrogenation, the light sulfur compounds in the catalytic cracking gasoline react w...

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Abstract

The invention provides a method for carrying out quality upgrading on catalytically cracked gasoline. The method provided by the invention comprises the following steps: carrying out pre-hydrogenationon the catalytically cracked gasoline to obtain pre-hydrogenated catalytically cracked gasoline; cutting the pre-hydrogenated catalytically cracked gasoline into a light fraction, a middle fraction and a heavy fraction; carrying out solvent extraction on the middle fraction to obtain raffinate containing rich olefin and extracted oil containing rich aromatic hydrocarbon; recycling light-weight olefin from the extracted oil, so as to obtain the light-weight olefin and sulfur-enriching oil; returning at least one part of the light-weight olefin back and carrying out backwashing in a solvent extraction system; carrying out etherification, catalytic cracking or alleviated aromatization on at least one of the other part in the light fraction, the raffinate and the light-weight olefin; carryingout selective hydrogenation and desulfurization on the heavy fraction and the sulfur-enriching oil, so as to obtain a desulfurized heavy fraction. According to the method provided by the invention, the sulfur content and the olefin content are reduced and the octane value of a gasoline product can be improved.

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 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 number while ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G69/00
CPCC10G69/00C10G2300/202C10G2400/02
Inventor 高金森赵亮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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