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Method for producing reforming feedstock by light and medium gasoline distillates

A light distillate and raw material technology, applied in the field of catalytic reforming raw material production, can solve the problems of harsh operating conditions, hydrogen consumption, complex process, etc., and achieve the effects of avoiding wastewater treatment, simplifying operating procedures, and simple process conditions

Active Publication Date: 2012-12-12
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of method that uses gasoline light middle fraction as raw material to produce catalytic reforming raw material, and it is the technology that produces catalytic reforming raw material through extraction and rectification with catalytic cracking gasoline light middle fraction as raw material, and this technique is through simple At the same time, the FCC gasoline is desulfurized and dearomatized, and the solvent is recovered, so as to overcome the shortcomings of the existing catalytic reforming raw material production technology, such as complex process, harsh operating conditions, and large consumption of hydrogen sources

Method used

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  • Method for producing reforming feedstock by light and medium gasoline distillates
  • Method for producing reforming feedstock by light and medium gasoline distillates
  • Method for producing reforming feedstock by light and medium gasoline distillates

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The first step, fractionation prefabrication of FCC gasoline light and mid-distillate feedstock

[0028] FCC gasoline 1 with a sulfur content below 1000ppm and an aromatics content below 40% from the catalytic cracking unit is sent to the middle part of the pre-fractionation tower 2, and the light fraction 3 of the catalytic cracking gasoline fractionated by the pre-fractionation tower is discharged from the top of the tower, and the catalyst The middle distillate 4 of the cracked gasoline is extracted from the side line in the upper part of the tower. The light distillate and the middle distillate with a distillation range of FCC gasoline below 170°C will be used as raw materials for the next extraction and rectification. The heavy distillate 5 of FCC gasoline with a distillation range higher than 170°C Discharged from the bottom of pre-fractionation tower 2, will be used as raw material for hydrodesulfurization;

[0029] The second step is the extraction, rectificatio...

Embodiment 2

[0040] The volume ratio of the light fraction and the middle fraction of the extraction agent to the catalytic cracking gasoline is changed to 1:1, the reflux ratio is changed to 5:1, and the operating temperature of the extractive distillation tower is changed to 50-80°C at the top of the tower and 121°C at the bottom of the tower. ~ 125 DEG C, other technological operating conditions are all the same as embodiment 1. The product indicators after extraction and rectification treatment are: the sulfur content of raffinate oil is 16ng / μl, and the content of benzene and aromatics is not detected.

Embodiment 3

[0042] The volume ratio of the extraction agent to the light fraction and middle fraction of FCC gasoline is changed to 0.7:1, the reflux ratio is changed to 4:1, and the operating temperature of the extractive distillation tower is changed to 50-82°C at the top of the tower and 110°C at the bottom of the tower. ~115 ℃, other process operating conditions are all the same as embodiment 1. The product indicators after extraction and rectification treatment are: the sulfur content of the raffinate is 30ng / μl, the aromatics content is not detected, and the benzene content is a trace.

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Abstract

The invention relates to a method for producing catalytic reformed feedstock by taking light and medium gasoline distillates as raw materials and extracting selective solvent to extract and rectify catalytically cracked gasoline in the absence of hydrogen. The method comprises the following steps: 1, fractionation prefabrication of light and medium distillate raw materials of catalytically cracked gasoline; and 2, extraction, rectification, desulfuration and dearomatization of light and medium distillates of catalytically cracked gasoline, wherein light and medium distillates of catalyticallycracked gasoline obtained in step 1 are fed into the middle-lower part of an extraction-rectification tower, while fresh extraction agent or recycled extraction agent is added from the upper part of the extraction-rectification tower; thus, the light and medium distillates contact the extraction agent inside the tower to generate desulfurized and dearomatized light-component raffinate phase (i.e.catalytic reformed feedstock product) rich in olefin hydrocarbon at the top of the tower after extraction, rectification, desulfuration and dearomatization. The method carries out desulfuration and dearomatization of catalytically cracked gasoline at the same time and reclaims solvent, thereby having the advantages of simple process, moderate operation conditions, hydrogen source saving and low production cost.

Description

technical field [0001] The invention relates to a process for refining catalytic cracking gasoline with selective solvent extraction and rectification in the absence of hydrogen, specifically a method for producing catalytic reforming raw materials by using gasoline light and middle distillates as raw materials. Background technique [0002] Catalytic reforming is an important refining process for producing high-octane gasoline and light aromatics (BTX aromatics) from gasoline (mainly straight-run gasoline). Catalytically reformed gasoline is an important component of unleaded high-octane gasoline. Catalytic reforming plays an important role in solving the current problem of increasing gasoline consumption and producing clean gasoline. It also provides benzene-toluene-xylene mixture (BTX) raw materials for petrochemicals to meet the downstream product PTA The growth needs of hydrogenation and provide a large amount of cheap hydrogen source for the development of hydrogenati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G7/02C10G21/22C10G35/04
Inventor 侯凯湖张文林杨红健王兰芝祖凤华王红秋朴佳锐陈娜米冠杰
Owner PETROCHINA CO LTD
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