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A kind of toluene shape-selective disproportionation catalyst and its preparation method and application

A catalyst and toluene technology, applied in the field of toluene shape-selective disproportionation catalyst and preparation thereof, can solve the problems of difficult-to-modify coating, high viscosity, high price of organosiloxane, etc., and achieve a simple and easy preparation method and low preparation cost , the effect of uniform distribution

Active Publication Date: 2017-09-29
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the domestic toluene shape-selective disproportionation catalyst mainly uses organosiloxane to modify HZSM-5. The organosiloxane is expensive and has a high viscosity, and it is difficult to form uniform SiO in the modification process. 2 Modified coating, resulting in catalyst shape-selective disproportionation performance indicators not meeting the requirements of industrial applications

Method used

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  • A kind of toluene shape-selective disproportionation catalyst and its preparation method and application
  • A kind of toluene shape-selective disproportionation catalyst and its preparation method and application
  • A kind of toluene shape-selective disproportionation catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Preparation of toluene shape-selective disproportionation catalyst:

[0074] (1) Take 210g silicon aluminum molar ratio SiO 2 / Al 2 o 3 Add 40g of silica sol (SiO2 The weight percentage is 30%) and 3.75ml concentrated HNO 3 (65~68wt%) and 5.25g scallop powder, kneaded and extruded into strips, naturally air-dried and calcined at 550° C. for 4 hours to obtain catalyst precursor A;

[0075] (2) Get the catalyst matrix A in the step (1) and join in the cyclohexane solution of 1M oxalic acid according to the ratio of solid-liquid ratio 1g:5ml, after 85 ℃ of stirring 2h, suction filtration, washing, air-drying, then in 120 ℃ and dried for 12 hours to obtain acid-treated catalyst precursor B;

[0076] (3) The acid-treated catalyst precursor B in step (2) is immersed in the mixed solution of tetraethyl orthosilicate and cyclohexane, and the solid catalyst matrix B of the acid treatment and tetraethyl orthosilicate and cyclohexane The liquid ratio is 1.45g:0.45ml:10ml, and...

Embodiment 2

[0079] Preparation of toluene shape-selective disproportionation catalyst:

[0080] Steps (1)~(4) are the same as steps (1)~(4) in Example 1, the only difference is: in step (3), replace orthosilicic acid with polyphenylmethylsiloxane (PPMS) ethyl ester.

[0081] Catalyst D is obtained.

Embodiment 3

[0083] Preparation of toluene shape-selective disproportionation catalyst:

[0084] Steps (1)-(4) are the same as steps (1)-(4) in Example 1, the only difference is that polydimethylsiloxane (PDMS) is used in step (3) instead of ethyl orthosilicate ester.

[0085] Catalyst E is obtained.

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Abstract

The invention provides a toluene shape-selective disproportionation catalyst and a preparation method and a use thereof. The preparation method of the toluene shape-selective disproportionation catalyst comprises the steps: preparation of a catalyst matrix, acid modification of the catalyst matrix, and chemical liquid deposition modification of the acid modified catalyst matrix; the chemical liquid deposition modification comprises dipping the acid modified catalyst matrix in an organosilicone compound solution, stirring continuously, followed by carrying out rotary evaporation under the condition of the ambient temperature of 15-40 DEG C and with the rotary evaporation vacuum degree of 0.01-0.1 MPa and the temperature of 30-80 DEG C to remove a solvent, then drying, and roasting to obtain the toluene shape-selective disproportionation catalyst. The toluene shape-selective disproportionation catalyst provided by the invention is used in toluene shape-selective disproportionation, the toluene conversion rate and the paraxylene selectivity reach the level of industrialization, the long-time use performance is stable, various indicators meet the requirements of industrialized production, and the toluene shape-selective disproportionation catalyst has quite good prospects for industrialized application.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a toluene shape-selective disproportionation catalyst and its preparation method and application. Background technique [0002] Paraxylene (PX) is the leader of the polyester industry, mainly used in the production of purified terephthalic acid (PTA), dimethyl terephthalate (DMT), and the polymerization reaction of dimethyl terephthalate and ethylene glycol Generate polyethylene terephthalate (PET, polyester), and PET is the raw material for the production of polyester fibers, diaphragms and bottle flakes. There are three industrial technologies to increase the production of p-xylene: (1) Aromatics produced by steam reforming and steam cracking of petroleum fractions, coal liquefaction or coal gasification contain a large amount of toluene, and toluene disproportionation and transalkylation technologies have become production Important technologies for paraxylene. (2) The aro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J35/10C07C15/08C07C6/12
CPCY02P20/52
Inventor 张鑫李雪永
Owner CHINA UNIV OF PETROLEUM (BEIJING)