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Catalyst for toluene disproportionation and alkyl transfer

A technology of transalkylation and toluene disproportionation, applied in physical/chemical process catalysts, molecular sieve catalysts, organic chemistry, etc., can solve the problems of low yield of mixed xylene, low catalyst activity, low yield of benzene and mixed xylene, etc. , to achieve high activity and selectivity, improve reactivity, and increase yield.

Active Publication Date: 2007-08-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the activity of the catalyst is low in the previous literature and research reports, and the yield of benzene and mixed xylene is low, especially the low yield of mixed xylene. A new Toluene Disproportionation and Transalkylation Catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of H-high silica mordenite: using silica gel as silicon source, sodium metaaluminate as aluminum source, hydrothermal crystallization in alkaline aqueous solution and autogenous pressure at 170°C for 30 hours to obtain Na-high silica mordenite, its SiO 2 / Al 2 o 3 (Molar ratio) = 10 Ion exchange with ammonium chloride solution or ammonium nitrate solution at 90-98°C for 1-8 hours, filter off the mother liquor, repeat the ion exchange operation several times, then wash, and dry at 110°C to obtain ammonium-type mercerization Zeolite, then exchanged with dilute hydrochloric acid three times, and then dried and roasted to obtain SiO 2 / Al 2 o 3 (Molar ratio)=28 dealuminated high silica mordenite.

[0018] Hydrogen-type high-silica mordenite and pseudoboehmite (α-Al 2 o 3 ·H 2 O) mixing, adding dilute nitric acid, sodium carbonate, bismuth nitrate and water, kneading evenly, extruding, drying at 105°C, pelletizing, and roasting at 575°C to obtain catalyst ...

Embodiment 2

[0020] Synthesize and prepare SiO with the same method of embodiment 2 / Al 2 o 3 (molar ratio) = H-silica mordenite of 15, and commercially available pseudo-boehmite (α-Al 2 o 3 ·H 2 O) mixing, adding dilute nitric acid and water, kneading evenly, extruding, drying at 110°C, pelletizing, and roasting at 400°C to obtain cylindrical objects, the weight ratio of molecular sieve and alumina is 70 / 30. This cylindrical object is impregnated and dried with an aqueous solution of group IIA metal nitrate, then immersed in an aqueous solution of molybdenum oxide and bismuth nitrate overnight, then dried at 110°C, and roasted at 520°C to obtain different molybdenum oxides and group IIA oxides. Catalysts H, I, J and K with bismuth oxide content.

Embodiment 3

[0022] With the H-high silica mordenite obtained in Example 1, knead with alumina, dilute nitric acid and water, knead evenly, extrude, dry at 110 ° C, pelletize, and roast at 400 ° C to obtain a cylindrical product, molecular sieve and alumina The weight ratio is 80 / 20. Catalysts M, N, O, P and Q with different contents of IA and IIA group oxides, molybdenum oxide, lanthanum nitrate and silver nitrate were prepared by impregnating with IA and IIA group oxides, molybdenum oxide, lanthanum nitrate and silver nitrate.

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Abstract

The present invention relates to catalyst for toluene disproportionation and transalkylation to solve problems in past that catalyst active is low, yield of benzene and particular xylol is on the low side. It uses the scheme to achieve purpose well that loads IA and / or IIA group metal or oxide and at least one metal or oxide selected from bismuth, molybdenum, argentums, copper, zirconium, lanthanum or rhenium on big-hole zeolite with SiO2 / Al2O3 of 12~50 mole rate, and can be used in practical industry.

Description

technical field [0001] The invention relates to a toluene disproportionation and transalkylation catalyst, in particular to a toluene disproportionation and transalkylation catalyst loaded with IA and / or Group IIA metals or oxides thereof on hydrogen-type large-pore zeolite. Background technique [0002] Aromatic hydrocarbon transalkylation catalysts usually use molecular sieve catalysts, and most of the currently industrialized catalysts use mordenite, beta zeolite, and ZSM-5 molecular sieves. [0003] Mordenite, natural or synthetic, the SiO 2 / Al 2 o 3 The molecular ratio is about 10 or less, but its activity of catalyzing toluene disproportionation and transalkylation reaction is low, and its life is short. The toluene disproportionation catalyst used in US3780122 (1973) has a mordenite silicon-aluminum ratio greater than 10, which is obtained by extracting and dealuminating the mordenite with a silicon-aluminum ratio of about 10. After such treatment, the mordenite s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/06C07C6/12C07C15/08
CPCY02P20/52
Inventor 孔德金李华英杨德琴
Owner CHINA PETROLEUM & CHEM CORP
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