Method and system for producing lower olefins and light aromatic hydrocarbons

A technology for low-carbon olefins and production methods, which is applied in the fields of hydrocarbon cracking to produce hydrocarbons, processing hydrocarbon oil, organic chemistry, etc., can solve the problems of not maximizing propylene production, and achieve the effect of improving economic and social benefits and promoting transformation and development.

Active Publication Date: 2020-04-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] From the technologies disclosed in the above patent applications, it can be seen that the development of existing technologies for producing low-carbon olefins from hydrocarbons mainly focuses on heavy oil catalytic cracking technology, and does not maximize the production of propylene. In order to meet the growing demand for low-carbon To meet the demand of olefins and light aromatics, it is necessary to develop a method of using conventional heavy oil as raw material and maximizing the conversion into light olefins and light aromatics and other chemical raw materials through product hydrotreating and refining, so as to improve process selectivity and efficiently Utilize oil resources

Method used

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  • Method and system for producing lower olefins and light aromatic hydrocarbons

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Experimental program
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Effect test

Embodiment approach

[0077] According to a preferred embodiment of the present invention, when the method is carried out in a riser reactor, the method comprises the steps of:

[0078] The heavy oil raw material enters the first reaction zone of the first riser reactor, contacts with the regenerated catalyst from the regenerator, and undergoes the first catalytic cracking reaction. The second catalytic cracking reaction is carried out in the reaction zone, and the reaction product and unborn catalyst enter the settler for gas-solid separation. The separated reaction product extraction device is further separated to obtain light olefins, light aromatics, middle distillates and other products; after hydrogenation, the middle distillate enters the second riser reactor to contact with the regenerated catalyst for reaction, and the reaction products and to-be After the raw catalyst is mixed with the reaction product in the second reaction zone of the first riser reactor and the mixture of the raw catal...

preparation example

[0089] The catalytic cracking catalyst preparation method used in the embodiment is briefly described as follows:

[0090] 1) Filter the mother liquor from the crystallized β molecular sieve (produced by Changling Catalyst Factory), wash with water, filter and dry; roast the dried molecular sieve in the air for 6 hours at a temperature of 550°C to remove the templating agent Get above-mentioned molecular sieve 100 grams (dry basis) and add in the NaOH solution of 1000 grams 2.4% by weight, be warming up to 65 ℃, after reacting for 30 minutes, after rapidly cooling to room temperature, filter, wash to filtrate neutrality. Then, add 800 grams of water to the filter cake to make a slurry, add 40 grams of NH 4 Cl, heated to 75°C, exchanged for 1 hour, to Na 2 The O content is lower than 0.2% by weight, filtered and washed to obtain a molecular sieve filter cake; take 50 grams (dry basis) of the above-mentioned molecular sieve and add water to prepare a molecular sieve slurry with...

Embodiment 1

[0093] This example is used to illustrate the method of the present invention.

[0094] according to figure 1 The process shown in the test is carried out on a medium-sized device. The heavy oil feedstock is atmospheric residue Z, the catalyst is A, and the preheated feedstock oil (350°C) enters the straight section of the first riser reactor (that is, the first reaction zone) to react at the bottom, and the reaction oil enters the diameter-expanding section of the first riser reactor from the outlet of the first reaction zone (that is, the second reaction zone, the ratio of the height of the straight cylinder section to the diameter-expanding section is 0.6:1, The ratio of the inner diameter of the enlarged diameter section to the straight section is 1.5:1) to continue the reaction, and the reacted stream enters the closed cyclone separator, the reaction product and the catalyst to be produced are separated rapidly, and the reaction product is further separated to obtain meth...

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Abstract

The invention relates to a method and a system for producing lower olefins and light aromatic hydrocarbons. The method comprises the following steps: introducing a heavy oil raw material into a firstcatalytic cracking reactor to bring the raw material into contact with a first catalytic cracking catalyst, and carrying out a first catalytic cracking reaction to obtain a first reaction product anda first spent catalyst; carrying out first oil-agent separation on the first reaction product and the first spent catalyst, carrying out scorching regeneration on the catalyst obtained by the first oil-agent separation, and separating out middle distillate oil from the obtained reaction product; bringing the obtained middle distillate oil into contact with a hydrotreating catalyst, and carrying out hydrotreating to obtain hydrogenated distillate oil; and introducing the obtained hydrogenated distillate oil into a second catalytic cracking reactor to bring the hydrogenated distillate oil into contact with a second catalytic cracking catalyst, and carrying out a second catalytic cracking reaction to obtain a second reaction product and a second spent catalyst. The method provided by the invention can produce more lower olefins and light aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a production method and system of light olefins and light aromatics. Background technique [0002] Ethylene and propylene are important organic chemical raw materials. According to analysis, my country's ethylene production in 2015 was 17.145 million tons, and its apparent consumption was 18.6607 million tons, an average increase of about 0.6% year-on-year; my country's propylene production and consumption continued to grow. Propylene production reached 22.61 million tons, a year-on-year increase of 13.63%; consumption was 25.87 million tons, a year-on-year increase of 19.3%, and the consumption growth rate was about 6 percentage points higher than the production growth rate. The relatively tight supply and demand pattern determines the annual demand for imported propylene. BTX (benzene, toluene, xylene) is an important petrochemical basic product, and is an important raw material for various chemical products such as synthetic...

Claims

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Application Information

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IPC IPC(8): C10G69/04C07C4/06C07C11/04C07C11/06
CPCC07C4/06C10G69/04C10G2300/1037C10G2300/1044C10G2300/1048C10G2300/107C10G2300/1077C10G2300/70C07C11/04C07C11/06Y02P20/584
Inventor 王迪首时龚剑洪魏晓丽
Owner CHINA PETROLEUM & CHEM CORP
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