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Method for preparing light olefin by microwave-driven catalytic cracking of crude oil

A light olefin and catalytic cracking technology, which is used in hydrocarbon cracking to produce hydrocarbons, chemical instruments and methods, catalysts, etc., to achieve the effects of increasing utilization value, improving energy efficiency, and reducing high temperature

Active Publication Date: 2021-12-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the high-temperature operation of the conventional steam cracking process and the carbon deposition in the cracking furnace tube pose great challenges to the construction and long-term safe operation of the cracking equipment

Method used

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  • Method for preparing light olefin by microwave-driven catalytic cracking of crude oil
  • Method for preparing light olefin by microwave-driven catalytic cracking of crude oil
  • Method for preparing light olefin by microwave-driven catalytic cracking of crude oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Considering the complexity of crude oil, the crude oil is firstly divided into representative components such as naphtha fraction (naphtha) and C6-C27 paraffins, and the catalytic cracking evaluation driven by microwave is carried out one by one. The previous crude oil was used as raw material to simulate real crude oil catalytic cracking to produce light olefins.

[0040] In this embodiment, the pressure of the raw material is controlled at 100kPa before entering the flash unit, and the preheating temperature is 250°C.

[0041] The crude oil flashing unit is equipped with a plate-type flashing tower with a theoretical plate number of 5, isothermal flashing operation, the operating pressure is controlled at 10kPa, and the operating temperature is 270°C;

[0042] The equipment of the microwave catalytic cracking reaction unit is a vertical fixed-bed reactor, the microwave frequency is 900MHz, and the microwave irradiation intensity is 1000kW / m 3 , the catalyst is a 120 ...

Embodiment 2

[0047] The representative components in crude oil (naphtha, the final boiling point of naphtha is 205°C) are used as the feed to the microwave catalytic cracking reaction unit to simulate the catalytic cracking of light mixed components in crude oil to produce light olefins.

[0048] In this embodiment, the pressure of the raw material is controlled at 70kPa before entering the flash unit, and the preheating temperature is 200°C.

[0049] The crude oil flashing unit is equipped with a plate-type flashing tower with a theoretical plate number of 3, isothermal flashing operation, the operating pressure is controlled at 50kPa, and the operating temperature is 220°C;

[0050] The equipment of the microwave catalytic cracking reaction unit is a vertical fluidized bed reactor, the microwave frequency is 2.45GHz, and the microwave irradiation intensity is 1500kW / m 3 , the catalyst is 120 mesh SiC powder loaded with 2wt.% carbon; the light fraction vapor enters from the bottom of the ...

Embodiment 3

[0055] All fractions of Saudi light crude oil whose atmospheric boiling point is before 440°C are used as the feedstock of the microwave catalytic cracking reaction unit to simulate the process of producing light olefins from catalytic cracking of real full mixed distillate crude oil.

[0056] In this embodiment, the pressure of the raw material is controlled at 130kPa before entering the flash unit, and the preheating temperature is 300°C.

[0057] The crude oil flashing unit is equipped with a plate-type flashing tower with a theoretical plate number of 5, isothermal flashing operation, the operating pressure is controlled at 3kPa, and the operating temperature is 300°C;

[0058] The equipment of the microwave catalytic cracking reaction unit is a vertical fluidized bed reactor, the microwave frequency is 2.45GHz, and the microwave irradiation intensity is 3000kW / m 3 , the catalyst is 300 mesh MnOx powder loaded with 0.5wt.% of carbon; the light fraction vapor enters from th...

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Abstract

The invention discloses a method for preparing light olefin by microwave-driven catalytic cracking of crude oil, which comprises the steps that firstly, a crude oil raw material is fed into a dehydration and metal ion unit, subjected to dehydration and metal ion removal, preheated and fed into a crude oil flash evaporation unit, the crude oil is cut into a heavy fraction and a light fraction, the light fraction is extracted from the top of the flash evaporation unit and then enters a microwave catalytic cracking reaction unit, light fraction steam makes contact with a catalyst and is heated to the temperature of 100-350 DEG C under microwave irradiation, a catalytic cracking reaction is carried out, mixed gas flow containing C2-C4 light olefin and byproducts H2 and C1-C4 alkane enters a product crude separation and unreacted fraction circulation unit, the mixed gas flow is cooled and preliminarily separated, unreacted components enter the microwave catalytic cracking unit to be circulated, and a product is refined. According to the invention, the light olefin is generated through high-selectivity cracking at a lower reaction temperature by utilizing the synergistic effect of microwaves and the catalyst, and the excellent results that the total selectivity of the C2-C4 light olefin is not lower than 71% and the single-pass yield of the light olefin is not lower than 31% can be achieved.

Description

technical field [0001] The invention belongs to the technical field of catalytic cracking of crude oil, in particular to a method for preparing light olefins by catalytic cracking of crude oil driven by microwaves. Background technique [0002] As key building blocks for the production of polymer materials such as plastics and rubber, light olefins such as ethylene and propylene play a vital role in the petrochemical industry. According to authoritative reports, the global demand for light olefins such as ethylene and propylene will maintain a rapid growth rate of 3% per year until 2030. This growing demand will drive producers to adopt new technologies to continuously expand the feedstock range of light olefins while reducing the cost of olefins production. At present, nearly 50% of the world's ethylene and propylene are still produced by steam cracking of naphtha at a high temperature of 800-850 ° C. Since the steam cracking device needs to provide energy through the comb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06C07C11/08
CPCC07C4/06C07C2527/224C07C2523/34C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 李伟松吴国光孟献梁褚睿智
Owner CHINA UNIV OF MINING & TECH
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