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A catalytic conversion method for producing ethylene and propylene

A catalytic conversion method and a technology of standby catalysts, which are applied in the production of bulk chemicals, chemical recovery, organic chemistry, etc., can solve the problems of low output of straight-run naphtha, impact on economy, and high local temperature, so as to improve operational stability The effect of overcoming high methane production rate and relieving huge pressure

Active Publication Date: 2017-10-03
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0010] Judging from the above existing technologies, the technical development of hydrocarbon catalytic cracking to produce ethylene and propylene mainly focuses on two aspects: one is heavy hydrocarbon raw materials such as vacuum gas oil and residual oil; the other is light distillate oil such as naphtha and diesel oil, among them, the technology of catalytic cracking of heavy hydrocarbon raw materials to produce light olefins has been mature and industrialized, but the existing problem is that when the total yield of ethylene and propylene is maintained at a high level, the propylene / ethylene ratio is low, and only heavy oil is relied on Catalytic cracking technology is difficult to meet the growing market demand for propylene
[0011] The catalytic cracking technology using light feedstock oil such as naphtha as raw material is in the research and development stage. Worldwide, light hydrocarbons and naphtha are the main cracking raw materials for ethylene production, and straight-run diesel oil is the main raw material for cracking. The proportion is very small, but my country's light hydrocarbon raw material oil resources are limited, and most of the crude oil is heavy oil, and the output of straight-run naphtha is very small, forcing the proportion of diesel raw material in ethylene production to be relatively high
[0012] At present, the catalytic cracking technology of straight-run diesel oil has been developing slowly. The reasons are that, firstly, the yield ratio of propylene and ethylene is relatively low, while the yield of by-products is too high, which affects its economic efficiency; Insufficient coke, the heat generated during the regeneration process of the standby catalyst is difficult to meet the demand for reaction heat
[0013] Aiming at the heat balance problem of the straight-run diesel catalytic cracking unit, the existing technology mainly adopts the technology of injecting or mixing fuel oil or coal powder in the stripping section, the spent agent delivery pipeline and the regenerator. These methods generally cause local If the temperature is too high, the device will be damaged, and it will also lead to catalyst deactivation, catalyst skeleton structure collapse and other adverse results

Method used

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  • A catalytic conversion method for producing ethylene and propylene
  • A catalytic conversion method for producing ethylene and propylene
  • A catalytic conversion method for producing ethylene and propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0074] According to one embodiment of the present invention, when the method of the present invention is carried out in riser reactor, generally carry out as follows:

[0075] The regenerated catalyst (catalytic cracking catalyst) rich in medium pore zeolite enters the pre-lift section of the riser reactor and flows upward under the action of the pre-lift medium. The preheated raw material oil is mixed with part of methane, and the mixture flow is mixed with atomized steam They are injected into the lower part of the riser reactor together, contact with the regenerated catalyst for catalytic cracking reaction and flow upward at the same time; the reacted stream enters the cyclone separator through the outlet of the riser reactor, and the separated reaction oil gas extraction device is further separated to obtain methane, ethylene, Fractions such as propylene, C4 hydrocarbons, and pyrolysis gasoline; part of the methane is returned to the riser reactor, and the separated raw cat...

Embodiment 1

[0094] according to figure 2 The test is carried out on the medium-sized device of the riser reactor. The feedstock oil is Yanshan straight-run diesel oil (properties are shown in Table 1). The preheated feedstock oil is mixed with part of methane and then enters the bottom of the riser (methane and The mass ratio of the raw material oil is 5:100), the cracking reaction is carried out under the conditions of the reaction temperature of 650°C, the reaction time of 1.8 seconds, the weight ratio of the catalytic cracking catalyst to the raw material oil of 15, and the weight ratio of water vapor to the raw material oil of 0.25. The reaction oil gas, water vapor and ungenerated catalyst enter the closed cyclone separator from the outlet of the reactor, the reaction oil gas and the ungenerated catalyst are quickly separated, and the reaction oil gas is cut according to the distillation range in the separation system after exchanging heat with the raw material, so as to obtain metha...

Embodiment 2

[0098] This example follows figure 2 The process of the test is carried out, the raw material oil is Yanshan straight-run diesel oil, and the test is carried out on the medium-sized device of the riser reactor, and the preheated raw material oil is mixed with part of methane and then enters the bottom of the riser (the mass ratio of methane to the raw material oil is 7.5: 100), under the conditions of reaction temperature 630°C, reaction time 2.0 seconds, weight ratio of catalytic cracking catalyst to feedstock oil 18, weight ratio of water vapor to feedstock oil 0.25, the cracking reaction is carried out to react oil gas, water vapor and raw The catalyst enters the closed cyclone separator from the outlet of the reactor, and the reacted oil gas and the unborn catalyst are quickly separated. After heat exchange with the raw material, the reacted oil gas is cut according to the distillation range in the separation system, thereby obtaining four groups of methane, ethylene, prop...

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Abstract

The invention provides a catalytic conversion method for producing ethylene and propylene, wherein the method comprises: under catalytic cracking conditions, contacting feed oil and methane with a paraffin content of 30-90% by mass with a catalytic cracking catalyst. The method provided by the invention can use raw material oil with high paraffin content (such as straight-run diesel oil) as raw material to produce ethylene and propylene with high selectivity, which not only solves the problem of shortage of petrochemical raw materials, but also improves the economic efficiency of the petrochemical industry. benefits and social benefits.

Description

technical field [0001] The present invention relates to a catalytic conversion process for the production of ethylene and propylene. Background technique [0002] Ethylene and propylene are important organic chemical raw materials. In 2012, the global ethylene demand increased by 3.9%, about 132Mt; the propylene demand increased by 4.0%, about 83Mt, and the demand ratio of propylene and ethylene 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. [0003] Steam cracking is a traditional technology for producing ethylene and propylene, and it will continue to be the main source of ethylene and propylene for a long time to come. Steam cracking raw materials mainly include light hydrocarbons (such as ethane, propane and butane), naphtha, diesel oil, condensate oil and hydroge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06
CPCY02P20/52Y02P20/584
Inventor 龙军毛安国魏晓丽
Owner CHINA PETROLEUM & CHEM CORP
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