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Downer reactor light hydrocarbon catalytic converting method and device

A catalytic conversion method and bed reactor technology, which is applied in the field of increasing olefin production by using down-bed reactors, can solve the problems of intensified thermal cracking, increased yield, and decreased yield, and achieve enhanced mixing, increased yield, and increased density. Effect

Pending Publication Date: 2019-04-12
李群柱
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the ultra-short reaction time must also be guaranteed by an ultra-large agent-to-oil ratio; otherwise, if the high conversion rate under ultra-short reaction time is achieved by increasing the reaction temperature, it will inevitably aggravate non-ideal reactions such as thermal cracking, which will lead to Increased yields of coke and dry gas, decreased yields of target products such as gasoline and light olefins

Method used

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  • Downer reactor light hydrocarbon catalytic converting method and device
  • Downer reactor light hydrocarbon catalytic converting method and device
  • Downer reactor light hydrocarbon catalytic converting method and device

Examples

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example 1

[0087] For example 1, the raw material of the down-bed reactor is catalytically cracked gasoline, and the down-bed reactor needs to adopt a super large agent-oil ratio of 30, so as to realize optimal reaction temperature distribution, improve reaction selectivity, improve propylene and gasoline yield, and increase the yield in gasoline. The aromatics content and octane number, the purpose of reducing the olefin content in gasoline.

[0088] This example uses figure 2 or image 3 The shown process flow, the prior art shown in Table 1 and the process conditions of the present invention and the molecular sieve catalyst (CHP-1) producing more propylene, gasoline feedstock and test results are listed in Table 2.

[0089] The results shown in Table 2 show that due to the limitation of the heat balance of the down-bed reactor, when the feed temperature of 400° C. is used in the prior art scheme B, the agent-oil ratio under the heat balance is only 12.1. Such a low ratio of agent t...

example 2

[0097] For Example 2, the feedstock for the down-bed reactor was olefin-rich mixed C4. This example uses figure 2 or image 3 Shown process flow, prior art shown in table 3 and process condition of the present invention and ZSM-5 molecular sieve catalyst.

[0098]The down-bed reactor usually needs to be operated with a super-large agent-to-oil ratio greater than 30 in order to optimize the reaction temperature distribution, improve reaction selectivity, and increase the yield of ethylene and propylene. However, the results in Table 3 show that when the feed is fed at a high temperature of 400°C, due to the limitation of the heat balance of the down-bed reactor, the agent-oil ratio under the heat balance of the prior art is only 16.3. Such a low F / O ratio will seriously affect the conversion and selectivity of the down-bed reactor

[0099] The properties and test results of the mixed C4 raw materials used in the present invention are listed in Table 4. Table 4 shows that t...

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Abstract

The invention provides a downer reactor light hydrocarbon catalytic converting method and device. The method specifically includes the following steps of firstly, making a preheated or non-preheated light hydrocarbon raw material and a low-temperature regenerant from a regenerant cooler enter the inlet end of a downer reactor and flow downwards along the reactor for catalytic cracking and other reactions, and making a mixture of reaction oil gas and a catalyst go downwards to the tail end of the reactor to be rapidly separated so that the catalyst and the oil gas can be rapidly separated, wherein the main operation conditions include the reaction temperature of 520-680 DEG C, the reaction pressure of 0.11-0.4 MPa, the contact time of 0.05-2 seconds and the agent-to-oil ratio of 6-50; secondly, making a separated to-be-generated agent enter a regenerator to be burned and regenerated after the to-be-generated agent is subjected to steam stripping through a to-be-generated agent stripper,wherein the regeneration temperature is controlled to be 630-730 DEG C; thirdly, making a regenerant from the regenerator enter the regenerant cooler to be cooled into 200-720 DEG C, and making the regenerant recycled in the downer reactor.

Description

technical field [0001] The invention belongs to a catalytic conversion method for light hydrocarbons, in particular to a method for increasing the production of olefins by using a down-bed reactor. Background technique [0002] Ethylene and propylene are important petrochemical basic raw materials. At present, light olefins mainly come from steam cracking units and catalytic cracking (cracking) units worldwide. Although the production of propylene can be increased by reducing the depth of cracking in the steam cracking unit, it will cause a decrease in the conversion rate of raw materials and the total yield of light olefins (ethylene propylene + butadiene). [0003] US6106697 discloses a kind of with wax oil or residual oil as raw material, adopts two-stage reactor to carry out catalytic cracking reaction selective production C 2 -C 4 Alkenes method. The wax oil or residue raw material is in the first-stage reactor, under conventional catalytic cracking conditions, conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G11/00
CPCC10G11/00
Inventor 李群柱李莉
Owner 李群柱
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