Alkyl aromatic isomerization catalyst and preparation and application thereof

A technology for alkyl aromatic hydrocarbons and catalysts, which is applied in the field of alkyl aromatic hydrocarbon isomerization catalysts and their preparation and application, and can solve problems such as low ethylbenzene conversion rate, unsatisfactory catalyst activity, selectivity, and difficulty in meeting production needs in overall performance , to achieve high aromatics isomerization and side chain dealkylation activity, and high isomerization selectivity

Pending Publication Date: 2021-02-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ethylbenzene conversion rate of these catalysts is low, and the overall performance cannot meet the current production needs.
[0006] WO98 / 05613 introduces a deethylation-type isomerization catalyst system, which includes three beds of catalysts, and introduces activated alumina with hydrogenation function to support Mo and other components in the second bed, in order to ensure that The olefin intermediates such as ethylene generated in the dealkylation process are saturated in time to reduce the degree of side reactions such as alkylation caused by it. From the results of the examples, the activity and selectivity achieved by the catalyst are not ideal

Method used

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  • Alkyl aromatic isomerization catalyst and preparation and application thereof
  • Alkyl aromatic isomerization catalyst and preparation and application thereof
  • Alkyl aromatic isomerization catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of catalyst provided by the invention comprises the steps:

[0022] (1) Mix sodium-type high-silicon five-membered ring zeolite, molybdenum oxide or its precursors with macroporous pseudo-boehmite evenly, add peptizer aqueous solution and knead, then shape, dry, and place in air at 400-650°C Roasting;

[0023] (2) Ion-exchange the solid roasted in step (1) with an ammonium salt solution, wash and dry the obtained solid, and impregnate it with a solution of a Group VIII metal compound. Roasting.

[0024] The step (1) of the method is carrier molding, mixing sodium-type high-silicon five-membered ring zeolite, molybdenum oxide or its precursor and macroporous pseudo-boehmite, adding an aqueous solution of a peptizer and kneading, and the peptizer is preferably Nitric acid, the concentration of the nitric acid solution prepared by adding water is preferably 1 to 5% by mass, more preferably 1.5 to 3.5% by mass. The addition amount of the nitric aci...

example 1

[0043] (1) Preparation of carrier

[0044] Take SiO 2 / Al 2 o 3 NaZSM-5, molybdenum oxide and macroporous pseudoboehmite powder (manufactured by Fushun Petrochemical Company Catalyst Factory, brand YH-2) with a molar ratio of 80 were mixed at a dry basis mass ratio of 65::2:35. After adding an aqueous solution of nitric acid with a concentration of 2% by mass, which accounts for 40% of the total mass of the powder, and kneading, extrusion molding, drying at 120°C for 2 hours, and roasting in air at 600°C for 3 hours to obtain a composite carrier, the macroporous pseudoboehmite The pore volume of YH-2 is 0.96mL / g, and the specific surface area is 364m 2 / g, the pore distribution is shown in Table 1.

[0045] (2) Preparation of catalyst

[0046] Get 100 grams of the composite carrier that (1) step makes, use the NH that concentration is 3 mass % 4 Cl aqueous solution carries out ion exchange at 90 DEG C for 2 hours, then immerses in 65 DEG C for 12 hours with chloroplatini...

example 2

[0048] Prepare catalyzer by the method for example 1, difference is (1) in step, replace macroporous pseudo-boehmite YH-2 with macroporous pseudo-boehmite YH-15 (Fushun Petrochemical Company Catalyst Factory production), described macroporous pseudo-boehmite YH-2 Pseudoboehmite YH-15 has a pore volume of 1.05mL / g and a specific surface area of ​​368m 2 / g, the pore distribution is shown in Table 1, the composition of the prepared catalyst G is shown in Table 2, and the physical properties are shown in Table 3.

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Abstract

The invention provides an alkyl aromatic isomerization catalyst which comprises a composite carrier and group VIII metal with the content of 0.005-0.2% by mass based on the composite carrier, the composite carrier comprises 48-75% by mass of high-silicon five-membered ring zeolite, 0.5-3.0% by mass of molybdenum oxide and 24-50% by mass of macroporous alumina, the total pore volume of the catalystis 0.4-1.5 mL/g, and the total specific surface area of the catalyst is 350-500 m < 2 >/g. The catalyst is used for an aromatic isomerization reaction, can improve the reaction activity of xylene isomerization and removal of aromatic side chain alkyl, and improves the selectivity of the isomerization reaction.

Description

technical field [0001] The invention relates to an alkyl aromatic hydrocarbon isomerization catalyst and its preparation and application, in particular to a deside-chain alkyl type alkyl aromatic hydrocarbon isomerization catalyst and its preparation method and application. Background technique [0002] In petrochemical plants, there are various processes that can produce C 8 Aromatic resources, in addition to p-, m-, and o-xylene, usually contain ethylbenzene. Using this as a raw material, p-xylene products can be obtained through the joint operation of unit technologies such as isomerization, rectification and adsorption separation. Since the boiling points of ethylbenzene and xylene are close, separation by rectification requires high energy consumption, low efficiency, and difficulty. Therefore, the method of converting ethylbenzene is often used to avoid the accumulation of ethylbenzene in the recycle stream of the combined unit. There are two ways to convert ethylben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44B01J29/72C07C5/27C07C4/18C07C15/04C07C15/08
CPCB01J29/44B01J29/72B01J35/1019B01J35/1038C07C5/2775C07C4/18C07C15/08C07C15/04Y02P20/52
Inventor 刘中勋周震寰康承琳王京梁战桥盖月庭阮迟王志强
Owner CHINA PETROLEUM & CHEM CORP
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