Method for increasing propylene yield and gasoline yield through high-selectivity catalytic cracking

A catalytic cracking, high-selectivity technology, applied in chemical instruments and methods, molecular sieve catalysts, production of bulk chemicals, etc., can solve problems such as less reports on ethylene and propylene

Active Publication Date: 2021-12-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] These documents mainly focus on how to superimpose olefin-containing liquefied gas or butene to generate gasoline fraction or diesel fraction, and how to superimpose liquefied gas or C4 olefins There are few reports on how the product is further catalytically cracked to form ethylene and propylene

Method used

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  • Method for increasing propylene yield and gasoline yield through high-selectivity catalytic cracking
  • Method for increasing propylene yield and gasoline yield through high-selectivity catalytic cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0179] Example 1 illustrates the effects of increasing propylene production and gasoline production during the process of the highly selective catalytic cracking method for increasing propylene production and increasing gasoline production provided by the present disclosure.

[0180] Experiments were carried out using a medium-sized device with three reactors for continuous reaction-regeneration operation, where the heavy oil cracking reactor was a riser, and the inner diameter of the riser reactor was 16 mm and the height was 3800 mm. The light hydrocarbon cracking reactor is a riser reactor with an inner diameter of 16 mm and a height of 3200 mm. The outlet of the first riser reactor and the second riser reactor is introduced into the fluidized bed reactor as an enhanced catalytic conversion reactor. The inner diameter of the fluidized bed reactor is 64 mm and the height is 300 mm.

[0181] The first catalytic cracking catalyst is the first regenerated catalyst with a temper...

Embodiment 2

[0204] Example 2 illustrates the effects of increasing propylene production and gasoline production during the process of the highly selective catalytic cracking method provided by the present disclosure for increasing propylene production and gasoline production.

[0205] The reaction apparatus that adopts is with embodiment 1. The main experimental steps are the same as in Example 1. The weight ratio of olefin-depleted recycle stream (-12~5℃) to heavy feedstock is 0.1:1. The weight ratio of light gasoline (9-120°C) to heavy raw material is 0.3:1. The weight ratio of multi-branched olefin products (100-130°C) to heavy feedstock is 0.11:1. The weight ratio of highly cracked olefin products (170-300°C) to heavy raw materials is 0.09:1.

[0206] In embodiment 2, only the isobutene-poor C4 flow fraction is introduced into a high-cracking olefin synthesis reactor to undergo superposition reaction, and the second synthesis product oil gas is obtained, which is further introduced...

Embodiment 3

[0210] Example 3 illustrates the effects of increasing propylene production and gasoline production during the process of the highly selective catalytic cracking method provided by the present disclosure for increasing propylene production and gasoline production.

[0211] The reaction apparatus that adopts is with embodiment 1. The main experimental steps are the same as in Example 1, except that the heavy raw material selected is a mixed raw material of hydrogenated wax oil mixed with four-line heavy oil. The main operating conditions and results are listed in Table 3.

[0212] Table 1-1

[0213] Catalyst name OMT-plus Chemical properties, wt% Al 2 o 3

53.5 P 2 o 5

2.35 RE 2 o 3

0.81 physical properties Total pore volume,ml / g 0.20 Micropore volume,ml / g 0.02 Specific surface, m 2 / g

139 Pore ​​area, m 2 / g

109 Matrix specific surface, m 2 / g

38 Bulk density, g / ml 0.7...

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Abstract

The invention relates to a method and a system for increasing propylene yield and gasoline yield through high-selectivity catalytic cracking. The method comprises the following steps: reacting a heavy raw material in a heavy oil cracking reactor and an enhanced catalytic conversion reactor, and separating to obtain a first product; separating the first product from the second product and the third product to obtain different fractions and the like; introducing the C4 liquefied gas fraction into a multi-branched olefin synthesis reactor for reaction, and separating to obtain an isobutylene-poor C4 material flow and a multi-branched olefin product; introducing the isobutene-poor C4 material flow and the light gasoline fraction into a high-cracking olefin synthesis reactor for reaction to obtain a high-cracking olefin product and an olefin-poor circulating material flow; enabling the lean olefin circulation material flow, the light gasoline fraction and the high-cracking olefin product to react in a light hydrocarbon cracking reactor and an enhanced catalytic conversion reactor, and separating to obtain a second product; injecting the multi-branched olefin product into the upper part of a heavy oil cracking reactor or an enhanced catalytic conversion reactor, and separating to obtain a third product; and mixing some fractions to obtain the product gasoline. According to the method, the reaction severity can be greatly reduced, the catalytic cracking propylene yield is greatly improved, and the yield of high-octane gasoline is increased.

Description

technical field [0001] The disclosure relates to a method for high-selectivity catalytic cracking to increase the production of propylene and gasoline. Background technique [0002] In the standard GB17930-2016 of the People's Republic of China for motor gasoline, the technical requirements for motor gasoline are that the content of olefins is not more than 15% (volume fraction), the content of aromatics is not more than 35% (volume fraction), and the content of benzene is not more than 0.8% (volume fraction ), the oxygen content is not more than 2.7% (mass fraction). According to the requirements of the National Development and Reform Commission and others, the use of ethanol gasoline for vehicles will be promoted nationwide by 2020. According to the current promotion of E10 ethanol gasoline (containing 10% ethanol), it is expected that the gasoline market for vehicles will be saturated. At the same time, MTBE will be restricted from being added to motor gasoline. As the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/10C07C11/06C07C2/10C07C2/12C07C11/02C07C7/00C07C5/27C07C11/08C07C11/09B01J23/755B01J29/46B01J35/10C10G57/00
CPCC07C4/10C07C2/10C07C2/12C07C7/00C07C5/27B01J29/46B01J23/755B01J35/1019B01J35/1038C10G57/00B01J2229/18C10G2300/4006C10G2300/4012C10G2300/4018C10G2300/305C10G2400/02C07C11/06C07C11/02C07C11/08C07C11/09Y02P20/52
Inventor 朱金泉朱根权王新首时刘守军杨义华侯典国
Owner CHINA PETROLEUM & CHEM CORP
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