Method for high production of low carbon olefin and system for high production of low carbon olefin

A low-carbon olefin and reactor technology, which is applied in the treatment of hydrocarbon oil, hydrocarbon oil cracking, and hydrocarbon oil treatment products, etc., can solve the problems of reducing the yield of back-refining and oil slurry, and the limited increase in the yield of propylene.

Active Publication Date: 2019-01-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method significantly increases the yield of gasoline and diesel in the catalytic cracking unit, and reduces the yield of recycled oil and oil slurry, but the increase in the yield of propylene is limited

Method used

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  • Method for high production of low carbon olefin and system for high production of low carbon olefin
  • Method for high production of low carbon olefin and system for high production of low carbon olefin
  • Method for high production of low carbon olefin and system for high production of low carbon olefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] This embodiment adopts figure 1 The process flow diagram shown is carried out, specifically:

[0107] Introducing the wax oil raw material with properties shown in Table 1 into a fixed-bed hydrocracking reaction zone for hydrocracking reaction to obtain a hydrocracking reaction effluent;

[0108] The hydrocracking reaction effluent is separated, and the hydrogen-rich gas in the gas phase product at the top of the separated high-pressure separator is processed by a circulating hydrogen compressor to obtain circulating hydrogen, and the circulating hydrogen is mixed with supplementary hydrogen to form a mixed hydrogen cycle Back in the fixed-bed hydrocracking reaction zone, the separated liquid phase product is led to fractionation in the fractionating tower to obtain the first dry gas and the first liquefied gas (note: the content of low-carbon olefins in the first liquefied gas is very small, Therefore, the yield of low-carbon olefins in the results of the examples doe...

Embodiment 2-3

[0125] Embodiment 2-3 adopts the same technological process as embodiment 1 to carry out, and difference is, the reaction conditions and product distribution of the fixed-bed hydrocracking reaction zone of embodiment 2-3 are as shown in table 3, and catalytic cracking The reaction conditions in the reaction zone are shown in Table 4. The product distribution obtained by the method of Examples 2-3 is shown in Table 4.

Embodiment 4

[0127] The present embodiment adopts the method similar to embodiment 1 to carry out, and difference is that the reaction temperature in the third reactor of the catalytic cracking reaction zone of the present embodiment is 30 ℃ higher than the reaction temperature in the second reactor, specifically , The reaction conditions and product distribution of the fixed-bed hydrocracking reaction zone of this embodiment are shown in Table 3, and the reaction conditions of the catalytic cracking reaction zone are shown in Table 4. The product distribution obtained by the method of this embodiment is shown in Table 4.

[0128] From the above results of the present invention, it can be seen that the method of the present invention organically combines the fixed-bed wax oil hydrogenation process with the catalytic cracking process according to the properties and characteristics of the fixed-bed wax oil hydrocracking product, which can significantly improve the propylene, Yield of high-va...

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Abstract

Relating to the wax oil utilization field, the invention discloses a method for high production of low carbon olefin and a system for high production of low carbon olefin. The method includes: introducing a wax oil raw material into a fixed bed hydrocracking reaction zone for hydrocracking reaction, separating the hydrocracking reaction effluent, and introducing the hydrogenated wax oil fraction into a first reactor and a second reactor successively for catalytic cracking reaction, also introducing first light naphtha into a third reactor of a catalytic cracking reaction zone, and carrying outcatalytic cracking reaction; and separating the catalytic cracking products obtained in the second reactor and third reactor of the catalytic cracking reaction zone, and recycling the circulating oilback into the fixed bed hydrocracking reaction zone. The method and system provided by the invention organically combine the fixed bed wax oil hydrogenation process with the catalytic cracking process, and can significantly improve the yield of propylene, ethylene and other high-value products in the combined process.

Description

technical field [0001] The invention relates to the field of hydrocarbon oil processing, in particular to a method for producing more light olefins and a system for producing more light olefins in a combined process of fixed-bed hydrocracking and catalytic cracking. Background technique [0002] The traditional petrochemical industry is based on steam cracking to produce ethylene. In my country, the main raw material for steam cracking is naphtha. However, in recent years, with the rising oil price and the continuous maturity of shale gas exploitation technology, the wide application of steam cracking devices using shale gas as raw material in North America continues to squeeze the oil industry. Naphtha is the economy of ethylene cracking raw material process. Compared with the ethylene product market, propylene has been less impacted by the shale gas revolution, and the gap in the market for propylene is still relatively large. Therefore, in the period of relatively low cr...

Claims

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Application Information

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IPC IPC(8): C10G69/00C10G45/04C10G45/06C10G45/08C10G45/46C10G45/48C10G45/50C10G47/20C10G11/05
CPCC10G11/05C10G45/04C10G45/06C10G45/08C10G45/46C10G45/48C10G45/50C10G47/20C10G69/00C10G2300/1037C10G2300/202C10G2300/205C10G2400/20
Inventor 梁家林任亮许双辰龙湘云魏晓丽胡志海
Owner CHINA PETROLEUM & CHEM CORP
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