Method for selective cracking of non-aromatic hydrocarbons

A non-aromatic, selective technology, applied in the field of selective cracking of non-aromatics, can solve the problems of poor selectivity and low cracking catalyst activity, achieve the effect of reducing strong acid sites and improving cracking activity

Active Publication Date: 2020-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problems of low cracking catalyst activity and poor selectivity in the prior art, and provides a new method for selective cracking of non-aromatic hydrocarbons

Method used

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  • Method for selective cracking of non-aromatic hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] SiO 2 / Al 2 O 3 195g of 25 mordenite and γ-Al 2 O 3 107.1g is uniformly mixed, then dilute nitric acid and sesbania powder are added and kneaded uniformly, extruded into strips, roasted to form a carrier, cut into pellets, and placed in a dipping container. The metal precursor iridium chloride was dissolved in water, mixed uniformly and impregnated with the surface of the support, dried at 120°C for 4 hours, and calcined at 500°C for 3 hours to prepare catalyst E.

[0034] In a fixed bed reactor, 20g of catalyst E was charged, hydrogen was added, the temperature was raised to 400°C, purged for two hours to reduce and activate, the reaction temperature was 400°C, the pressure was 3MPa, and WHSV=2.5h -1 Feeding under working conditions, the molecular ratio of hydrogen to hydrocarbon is 3.0. The raw material weight composition is toluene / methylcyclohexane=99.5 / 0.5. The catalyst reaction performance results are shown in Table 1. The catalyst remained stable after 300 hours of...

Embodiment 2

[0036] SiO 2 / Al 2 O 3 195g of 25 mordenite and γ-Al 2 O 3 107.1g is uniformly mixed, then dilute nitric acid and sesbania powder are added and kneaded uniformly, extruded into strips, roasted to form a carrier, cut into pellets, and placed in a dipping container. The metal precursor iridium chloride was dissolved in water, mixed uniformly, and impregnated on the surface of the support, dried at 120°C for 4 hours, and calcined at 500°C for 3 hours to prepare catalyst F.

[0037] In a fixed bed reactor, 20g of catalyst F was charged, hydrogen was introduced, the temperature was raised to 400°C, and the reductive activation was purged for two hours. The reaction temperature was 400°C, the pressure was 3MPa, and WHSV=2.5h -1 Feeding under working conditions, the molecular ratio of hydrogen to hydrocarbon is 3.0. The raw material weight composition is toluene / methylcyclohexane=99.5 / 0.5. The catalyst reaction performance results are shown in Table 1. The catalyst remained stable afte...

Embodiment 3

[0039] SiO 2 / Al 2 O 3 195g of 25 mordenite and γ-Al 2 O 3 107.1g is uniformly mixed, then dilute nitric acid and sesbania powder are added and kneaded uniformly, extruded into strips, roasted to form a carrier, cut into pellets, and placed in a dipping container. The metal precursor nickel nitrate was dissolved in water, mixed evenly and impregnated with the surface of the support, dried at 120°C for 4 hours, and calcined at 500°C for 3 hours to prepare catalyst G.

[0040] In a fixed-bed reactor, 20g of catalyst G was charged, hydrogen was added, the temperature was raised to 400°C, and the reductive activation was purged for two hours. The reaction temperature was 400°C, the pressure was 3MPa, and WHSV=2.5h -1 Feeding under working conditions, the molecular ratio of hydrogen to hydrocarbon is 3.0. The raw material weight composition is toluene / methylcyclohexane=99.5 / 0.5. The catalyst reaction performance results are shown in Table 1. The catalyst remained stable after 300 hou...

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Abstract

The invention relates to a method for selectively cracking non-aromatic hydrocarbon. The method for selectively cracking non-aromatic hydrocarbon mainly solves the problems in the prior art that a cracking catalyst is low in activity and poor in selectivity. Under a cracking reaction condition, a material which contains non-aromatic hydrocarbon and is derived from a toluene disproportionation and / or transalkylation reaction is in contact with the catalyst, wherein the catalyst is prepared from, by weight, 20-80 parts of at least one kind of zeolite of mordenite, ZSM-5, beta zeolite and gamma zeolite, 0.05-5 parts of at least one auxiliary of nickel, zinc, strontium, magnesium, iridium or an oxide thereof, and 10-40 parts of binder. The efficient cracking method of non-aromatic hydrocarbonwell solves the problems, and can be used for industrial production of cracking of the toluene disproportionation and / or transalkylation reaction.

Description

Technical field [0001] The invention relates to a method for selective cracking of non-aromatic hydrocarbons. Background technique [0002] Benzene, toluene and xylene (abbreviated as BTX aromatics) are important basic organic raw materials in modern petrochemical industry. Silico-alumina molecular sieve is a kind of crystalline aluminosilicate zeolite. The silicon atoms and aluminum atoms in the crystal structure are connected to each other through oxygen atoms to form a network structure. It is often used as an aromatic disproportionation and transalkylation catalyst. In addition, metals such as platinum, rhenium, molybdenum, and bismuth are usually introduced on the molecular sieve catalyst to improve the stability of the catalyst and increase the processing capacity of heavy aromatics. The document CN105272804A discloses a method for increasing the production of xylene by aromatic hydrocarbon transalkylation and non-aromatic hydrocarbon cracking. It is mainly aimed at the tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/22B01J29/24B01J29/18C07C4/06C07C9/08C07C9/10C07C9/14
CPCB01J29/18B01J29/185B01J29/22B01J29/24C07C4/06C07C9/08C07C9/10C07C9/14
Inventor 李华英王晓晨李经球孔德金
Owner CHINA PETROLEUM & CHEM CORP
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