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Method for maximally producing aromatic hydrocarbons from catalytic cracking gasoline

A technology for catalytic cracking of gasoline and aromatics, applied in chemical instruments and methods, molecular sieve catalysts, hydrocarbon oil treatment products, etc., can solve problems such as inability to convert into chemical products, achieve long-term stable operation, save production energy consumption, benzene The effect of low content

Active Publication Date: 2018-09-04
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing research mainly focuses on the production of gasoline blending components, which cannot be converted into various chemical products urgently needed by the market

Method used

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  • Method for maximally producing aromatic hydrocarbons from catalytic cracking gasoline
  • Method for maximally producing aromatic hydrocarbons from catalytic cracking gasoline
  • Method for maximally producing aromatic hydrocarbons from catalytic cracking gasoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 1. Preparation of aromatization catalyst

[0068] 1) Preparation of catalyst precursor

[0069] 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.

[0070] 2) Ion exchange modification

[0071] 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 0.2 % by weight, followed by drying at about 120°C for about 8 hours and firing at about 540°C for about 4 hours.

[0072] 3) The first modification treatment

[0073] 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 pho...

Embodiment 2

[0090] 1. Preparation of aromatization catalyst

[0091] 1) Preparation of catalyst precursor

[0092] 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.

[0093] 2) Ion exchange modification

[0094] 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.

[0095] 3) The first modification treatment

[0096] 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

[0112] like figure 1 As shown, the method of utilizing catalytic cracking gasoline to maximize the production of aromatics in this embodiment includes the following steps:

[0113] 1. Prehydrogenation

[0114] The composition of the catalytic cracking gasoline raw material in this embodiment is shown in Table 5.

[0115] Table 5 Composition of catalytic cracking gasoline feedstock

[0116]

[0117] In the presence of a pre-hydrogenation catalyst, the above catalytic cracked gasoline is pre-hydrogenated to obtain a pre-hydrogenation catalytic cracked gasoline; wherein the pre-hydrogenation catalyst is a nickel-molybdenum bimetallic catalyst, which consists of (mass content%): Al 2 o 3 90.5%, Ni6%, Mo 3.5%; the pre-hydrogenation process conditions are: control the reaction temperature at 130°C, the hydrogen-oil ratio is 5, and the volume space velocity is 3h -1 .

[0118] After the above-mentioned pre-hydrogenation, the light sulfur compounds in the catalytic cracking g...

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Abstract

The invention provides a method for maximally producing aromatic hydrocarbons from catalytic cracking gasoline. The method comprises pre-hydrogenating catalytic cracking gasoline to obtain pre-hydrogenated catalytic cracking gasoline, dividing the pre-hydrogenated catalytic cracking gasoline into a light fraction, a middle fraction and a heavy fraction, extracting the middle fraction through a solvent to obtain olefin-rich raffinate and aromatic-rich extract, carrying out mild aromatization on the light fraction and the raffinate to obtain an aromatization product, recovering the light olefinfrom the extract to obtain a light olefin and sulfur-rich oil, carrying out selective hydrodesulfurization on the heavy fraction and the sulfur-rich oil to obtain a desulfurized heavy fraction, and carrying out aromatic extraction or extraction rectification on the aromatization product and the desulfurized heavy fraction. The method realizes olefin reduction, desulfurization and octane value increasing treatment on catalytically cracked gasoline and maximizes aromatic hydrocarbon production.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a method for maximizing the production of aromatic hydrocarbons by utilizing catalytic cracking gasoline. Background technique [0002] With the increasing quality of petroleum resources and the increasing impact of vehicle exhaust emissions on the atmospheric environment, the requirements for the quality of gasoline for vehicles are becoming more and more stringent worldwide. my country's national VI motor gasoline standard, which will be implemented on January 1, 2019, requires gasoline sulfur content to be less than 10ppm, olefin content to be less than 15v%, and octane number to be maintained above 93. Therefore, the hallmark of producing high-quality gasoline is to increase the octane number at the same time as reducing the sulfur content and olefin content. [0003] At present, for the production of low-sulfur, low-olefin, and high-octane gasolin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/00B01J29/40B01J29/48
CPCB01J29/405B01J29/48C10G67/00C10G2300/202C10G2400/30
Inventor 高金森赵亮郝天臻王永涛张宇豪陈丰王晓琴曹丽媛徐春明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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