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Method for producing light olefins by catalytic cracking

A low-carbon olefin and catalytic cracking technology, which is applied in the field of light petroleum hydrocarbon catalytic cracking to produce low-carbon olefins, can solve the problems of reduced specific surface area of ​​catalyst particles, poor catalytic cracking effect, and reduced catalyst activity, so as to increase olefin products. Yield, the effect of improving the yield of cracked gas products, and the effect of improving gas yield

Active Publication Date: 2021-04-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned two inventive methods have solved the problems that the catalyst is easy to carbonize, the service life is short, and frequent regeneration is required in the fixed-bed reaction process, the specific surface area of ​​the catalyst particles is reduced due to the wide particle size distribution of the molecular sieve, resulting in a reduction in catalyst activity. , making the effect of catalytic cracking worse

Method used

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  • Method for producing light olefins by catalytic cracking
  • Method for producing light olefins by catalytic cracking
  • Method for producing light olefins by catalytic cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The naphtha produced from Daqing crude oil is used as raw material, and its composition is as follows (w%):

[0032] C4 2.45, C5 9.94, C6 22.3, C7 25.18, C8 25.73C9 12.09, C10 1.86, C11 0.07, C12 0.01. Among them, 35.17 normal alkanes, 27.29 isoparaffins, 0.56 alkenes, 31.8 naphthenes, 4.91 aromatics, and 0.24 unknowns.

[0033] Operating conditions: cracking furnace outlet temperature 838°C, crossover temperature 570°C, reaction pressure 85KPa, dilution ratio 0.5, residence time 0.202s, catalyst injection concentration in the total hydrocarbon feed is 300ppm.

[0034] To the same naphtha raw material under the same situation of other operating conditions, use the ZSM-5 catalyzer whose particle size distribution used in the present invention is 190-210nm, silicon-alumina ratio to be 62, and the conventional ZSM-5 catalyzer, all pass through The catalytic cracking reaction was compared on the basis of lanthanum nitrate and phosphoric acid modification treatment, and the...

Embodiment 2

[0038] According to the operation steps of Example 1, hydrocracking tail oil was used as raw material for cracking.

[0039] Operating conditions: cracking furnace outlet temperature 825°C, crossover temperature 547°C, reaction pressure 85KPa, dilution ratio 0.70, residence time 0.205s.

[0040] For the same hydrocracking tail oil under the same conditions of other operating conditions, use the ZSM-5 catalyst and the conventional ZSM-5 catalyst with a particle size distribution of 190-210nm and a silicon-aluminum ratio of 62 in the present invention. The catalytic cracking reaction was compared on the basis of the modification treatment of lanthanum nitrate and phosphoric acid, and the product yield is shown in Table 2.

[0041] Table 2

[0042]

Embodiment 3

[0044] According to the operation procedure of Example 1, cracking is carried out with straight-run diesel oil as raw material.

[0045] Operating conditions: 810°C, crossover temperature 543°C, dilution ratio 0.70, operating pressure 85KPa, residence time 0.205s,

[0046]To the same straight-run diesel feedstock under the same conditions of other operating conditions, use the ZSM-5 catalyzer and the conventional ZSM-5 catalyzer with a particle size distribution of 190-210nm and a silicon-aluminum ratio of 62 in the present invention. The catalytic cracking reaction was compared on the basis of the modification treatment of lanthanum and phosphoric acid, and the product yield is shown in Table 3.

[0047] table 3

[0048]

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Abstract

The invention relates to a method for producing low-carbon olefins by catalytic cracking, which comprises the following steps: after modifying the original ZSM-5 nanometer molecular sieve catalyst powder, using naphtha or diesel oil to prepare an aerosol catalyst mixture The solution is introduced into the reactor by the nozzle, so that the catalyst is evenly dispersed in the reactants, wherein the ZSM‑5 nanometer molecular sieve catalyst has a concentration of 200 to 400 ppm in the total hydrocarbon feed; then the reactants Perform a catalytic cracking reaction with the ZSM-5 nanometer molecular sieve catalyst in a reactor to generate low-carbon olefins. The present invention can effectively avoid the problem in the prior art that the specific surface area of ​​the catalyst particles is reduced due to the wide distribution of molecular sieve particle sizes, which leads to the reduction of catalyst activity and the deterioration of the catalytic cracking effect.

Description

technical field [0001] The present invention relates to a method for producing light olefins. Specifically, it belongs to a process for producing light olefins by catalytic cracking of light petroleum hydrocarbons. Background technique [0002] At present, in the petrochemical industry, the use of catalysts is more common, mainly because the use of catalysts can reduce the reaction temperature, improve the reaction selectivity, reduce the amount of by-products generated, and improve the utilization rate of raw materials. Among them, the thermal cracking process is mainly used. [0003] Document 200410101548.1 reports a catalytic cracking method, which is to introduce a nano-molecular sieve catalyst into the existing thermal cracking process for producing light olefins, and introduce the mixed liquid containing the ultra-fine catalyst into the tube between the preheater and the reactor. In the way, light hydrocarbons are subjected to catalytic cracking reaction in the react...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/06C07C11/04C07C11/06C07C11/167B01J29/40B01J35/10C10G47/02
CPCC10G47/02C07C4/06B01J29/405B01J2229/186C10G2400/20B01J35/23B01J35/40B01J35/615C07C11/04C07C11/06C07C11/167Y02P20/52
Inventor 刘学龙潘洪义孙艳红赵胤李正孙海英盛光刘振明
Owner PETROCHINA CO LTD