Catalytic cracking method and system for heavy oil feedstock

A technology of catalytic cracking and heavy oil, which is applied in the treatment of hydrocarbon oil, petroleum industry, hydrotreating process, etc. It can solve the problems of reducing the dry gas yield and not producing low-carbon olefins, so as to improve economic and social benefits and promote The effect of transformational development

Active Publication Date: 2021-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] CN101191070A discloses a method for producing low-carbon olefins. In this method, the catalytic cracking catalyst is pre-extracted and reacted with raw materials in a reactor. The product obtained after the reaction and the catalyst to be produced are drawn out of the reactor for separation, and the low-carbon olefins are obtained after the separation. , gasoline, diesel, heavy oil and other low molecular saturated hydrocarbons, characterized by reduced dry gas yield
[0013] From the technologies disclosed in the above patent applications, it can be seen that the development of the existing technologies for producing low-carbon olefins from hydrocarbons mainly focuses on heavy oil catalytic cracking technology, and does not maximize the production of low-carbon olefins. In order to meet the growing demand To meet the demand for low-carbon olefins, it is necessary to develop a method that uses conventional heavy oil as raw material and converts it into low-carbon olefins and other chemical raw materials to the maximum extent through product hydrotreating and refining, so as to improve process selectivity and efficiently utilize petroleum resources.

Method used

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  • Catalytic cracking method and system for heavy oil feedstock

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Embodiment approach

[0074]One embodiment, the first catalytic cracking reactor is a riser reactor, and the second catalytic cracking reactor is a fluidized bed reactor; the conditions of the first catalytic cracking reaction include: the reaction temperature is 550- 720°C, preferably 580-700°C, more preferably 620-690°C, the oil and gas residence time is 1-10 seconds, preferably 1.5-6 seconds, more preferably 1.5-4 seconds, and the reaction pressure is 0.13-1 MPa , preferably 0.25-0.4 MPa, the weight ratio of agent to oil is 1-100, preferably 10-50:1, more preferably 20-40:1, and the weight ratio of refining and cracking heavy gasoline to heavy oil raw materials is 0.05-0.7 ; The reaction temperature of the riser reactor refers to the outlet temperature of the riser reactor; the reaction pressure refers to the gauge pressure. The conditions of the second catalytic cracking reaction include: the reaction temperature is 530-730°C, preferably 560-680°C, more preferably 610-660°C, and the reaction ti...

preparation example 1

[0090] The preparation method of the hydrotreating catalyst used in the embodiment is as follows:

[0091] Using commercially available pseudo-boehmite as Al source, 3.5% HNO by weight 3 The aqueous solution is used as a binder, and an appropriate amount of Mg is introduced 2+ After extruding, it is dried at 120°C and calcined at 600°C to obtain a composition of 5% MgO and 95% Al 2 o 3 carrier.

[0092] Weigh 67g Ni(NO 3 ) 2 ·6H 2 O and 24g (NH 4 )6Mo 7 o 24 ·6H 2 O·4H 2 O was dissolved in 100g of distilled water, and 17g of NH 4 h 2 PO 4 , to which an appropriate amount of concentrated HNO was added dropwise 3 Dissolve the precipitate and adjust the pH value between 5-6 to form solution I; add 25g citric acid to solution I to form solution II; heat solution II to 70°C, dropwise add it to 1000g carrier while hot, and dry After drying, bake at 550°C for 8 hours. Catalyst before use in H 2 Reduction at 600°C for 12 hours. The catalyst weight composition is: 12%...

Embodiment 1

[0094] This example is used to illustrate the method of the present invention.

[0095] according to figure 1 The flow shown is tested, and the test is carried out on a medium-sized device. The heavy oil feedstock is atmospheric residue Z, the catalyst is catalyst MMC-2, and the preheated heavy oil feedstock (350°C) enters the bottom of the riser reactor that complies with the reactor. The reaction is carried out, and the reaction oil enters the fluidized bed reactor of the compound reactor from the outlet of the riser reactor to continue the reaction. After the reaction, the stream enters the closed cyclone separator, and the reaction product and the unborn catalyst are quickly separated, and the reaction product is further separated to obtain ethylene. , propylene, butene, and pyrolysis heavy gasoline M1 with a distillation range of 160-220°C.

[0096] The pyrolysis heavy gasoline M1 and the hydrotreating catalyst H are subjected to hydrotreating in the presence of a solven...

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Abstract

The invention relates to a method and system for catalytic cracking of heavy oil raw materials. The method comprises: introducing heavy oil raw materials into a first catalytic cracking reactor to contact with a catalytic cracking catalyst and performing the first catalytic cracking reaction; The reaction oil agent is introduced into the second catalytic cracking reactor to carry out the second catalytic cracking reaction to obtain the unused catalyst and reaction product, regenerate the unused catalyst to obtain the regenerated catalyst as the catalytic cracking catalyst and return to the first catalytic cracking reaction In the reactor, the obtained reaction product is separated into cracked heavy gasoline; the obtained cracked heavy gasoline is contacted with a hydrotreating catalyst and subjected to hydrotreating to obtain hydrotreated oil, and the hydrotreated oil is introduced into the first catalytic cracking reactor The first catalytic cracking reaction is carried out in. The method and system of the present invention can increase the yield of light olefins.

Description

technical field [0001] The invention relates to a catalytic cracking method and system for heavy oil raw materials. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important organic chemical raw materials, especially the production capacity of ethylene is often regarded as a symbol of the petrochemical development level of a country or region. According to analysis, my country's ethylene production in 2015 was 17.145 million tons, and 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. In 2016, 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 growth rate of consumption was about 6 percentage points higher than the growth rate of production. The relatively tight supply and demand pattern determines the annual demand f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G69/04
CPCC10G69/04C10G2300/10C10G2300/1037C10G2300/107C10G2300/1077C10G2300/70
Inventor 张金行张久顺魏晓丽王迪
Owner CHINA PETROLEUM & CHEM CORP
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