Catalytic conversion method for producing propylene and fuel oil

A catalytic conversion method and fuel oil technology, which are applied in the field of catalytic conversion for the production of propylene and fuel oil, can solve the problems of insufficient reaction heat, low gasoline yield, and increased dry gas yield, so as to improve operational stability and overcome dryness. The effect of high gas production rate and reduced possibility

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0011] From the point of view of existing technologies, the development of catalytic conversion of hydrocarbons to produce low-carbon olefins and fuel oil mainly focuses on heavy oil catalytic cracking technology. In order to increase the yield of propylene, a higher reaction temperature is used, resulting in a substantial increase in the yield of dry gas, especially methane, in the case of increasing the yield of propylene
[0012] When middle distillates such as straight-run diesel oil are used as raw materials, because the raw materials contain more paraffins, through a cracking reaction, although the yield of by-product methane in the product is higher, it still has a higher yield of olefins and gasoline fractions , and because the raw material molecules are relatively small compared to heavy oil molecules, a higher reaction temperature is required to effectively crack. problem, which makes the regenerator carbon accumulation prone to occur during the operation of the unit, which eventually leads to the deterioration of product distribution
[0013] In addition, the existing technology does not make full use of the high-octane components in gasoline and the latent content of gasoline in diesel, resulting in low gasoline yield

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  • Catalytic conversion method for producing propylene and fuel oil

Examples

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Effect test

Embodiment 1

[0104] according to figure 2 The test is carried out according to the process, straight-run diesel oil is directly used as the raw material for catalytic cracking, and the test is carried out on a medium-sized device in the riser reactor. Yanshan straight-run diesel oil is mixed with part of methane (the mass ratio of methane to raw oil straight-run diesel oil is 5:100) After that, it enters the bottom of the riser reactor. The cracking reaction is carried out under the conditions that the reaction temperature is 620°C, the reaction time is 2.5 seconds, the weight ratio of catalytic cracking catalyst to raw oil is 30, and the weight ratio of water vapor to raw oil is 0.25; the reaction product oil gas and the catalyst to be born Separation in the settler, the spent catalyst enters the stripping section under the action of gravity, and the hydrocarbon products adsorbed on the spent catalyst are stripped by water vapor, and the spent catalyst after stripping is exchanged with t...

Embodiment 2

[0106] This example follows figure 2 The process of Yanshan straight-run diesel oil is directly used as the raw material of catalytic cracking, and the test is carried out on a medium-sized device with a riser reactor. ) after mixing, the cracking reaction is carried out under the conditions that the reaction temperature is 640°C, the reaction time is 2.0 seconds, the weight ratio of catalytic cracking catalyst to raw oil is 25, and the weight ratio of water vapor to raw oil is 0.25. The raw catalyst is separated in the settler, and the raw catalyst enters the stripping section under the action of gravity, and the hydrocarbon products adsorbed on the raw catalyst are stripped by water vapor, and the raw catalyst after stripping is mixed with the high-temperature flue gas from the regenerator After the heat exchange (the temperature of the ungenerated catalyst after the heat exchange is 600°C), it enters the regenerator and contacts with air for regeneration. The regenerated ...

Embodiment 3

[0108] This example follows figure 2 The process of Yanshan straight-run diesel oil is directly used as the raw material for catalytic cracking, and the test is carried out on a medium-sized device with a riser reactor. Methane is mixed with feedstock oil (the mass ratio of methane to feedstock straight-run diesel oil is 10:100) Then enter the bottom of the reaction zone. The cracking reaction is carried out under the conditions that the reaction temperature is 640°C, the reaction time is 2.5 seconds, the weight ratio of catalytic cracking catalyst to raw oil is 25, and the weight ratio of water vapor to raw oil is 0.25. The reaction product is oil gas and unborn catalyst. Separation in the settler, the spent catalyst enters the stripping section under the action of gravity, and the hydrocarbon products adsorbed on the spent catalyst are stripped by water vapor, and the spent catalyst after stripping is exchanged with the high-temperature flue gas from the regenerator (The t...

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Abstract

The invention provides a catalytic conversion method for producing propylene and fuel oil. The method comprises the following steps: enabling raw material oil of which the paraffin content is 40-90wt% and methane to contact with a catalytic cracking catalyst under the catalytic cracking condition; separating out pyrolysis gas oil from a contacted mixture; and carrying out aromatics extraction on the pyrolysis gas oil to obtain extract oil and raffinate oil. According to the method provided by the invention, the raw material oil (for example, straight-run diesel oil), which is relatively high in paraffin content can be adopted as a raw material; low-carbon olefin, particularly propylene and fuel oil can be produced at high selectivity; the problem of shortage of petrochemical materials is solved; and the economic benefits of a refinery plant are improved.

Description

technical field [0001] The invention relates to a catalytic conversion method for producing propylene and fuel oil. Background technique [0002] Propylene is an important organic chemical raw material. According to analysis, the global demand for propylene increased by about 4.0% in 2012, about 83Mt, and the supply-demand ratio of propylene was about 1.0. In the past 10 years, the growth rate of world propylene demand has been higher than that of ethylene. It is estimated that in the next 20 years, the growth rate of world propylene demand will still exceed the growth rate of ethylene demand. At present, 61% of the world's propylene comes from the by-products of steam cracking to produce ethylene, and 34% comes from the by-products of gasoline and diesel produced by catalytic cracking units in refineries. Among them, steam cracking uses naphtha and other light oils as raw materials to produce ethylene through thermal cracking And propylene, but the yield of propylene is on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G55/06C10G69/00
CPCC10G55/06C10G69/00C10G2400/20Y02P30/40
Inventor 魏晓丽毛安国张久顺
Owner CHINA PETROLEUM & CHEM CORP
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