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Toluene disproportionation and transalkylation catalyst and preparation method thereof

A technology for alkylation transfer and toluene disproportionation, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of increasing catalyst preparation steps and increasing catalyst costs, and achieve low catalyst costs and simple preparation methods , the effect of high conversion rate of toluene

Active Publication Date: 2010-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the existing toluene disproportionation and transalkylation catalysts all use molecular sieve as the carrier, and both need to load a certain amount of active metal components or adopt a special molecular sieve modification method, which increases the preparation steps of the catalyst and increases the cost of the catalyst.

Method used

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  • Toluene disproportionation and transalkylation catalyst and preparation method thereof
  • Toluene disproportionation and transalkylation catalyst and preparation method thereof
  • Toluene disproportionation and transalkylation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Synthesis of Y / Beta / ZSM-12 Composite Molecular Sieve

[0026] Raw material molar ratio: 1.07Na 2 O: 8.7SiO 2 : 1.5TEABr : 0.8NH 4 OH:Al 2 o 3 : 100H 2 O. Weigh 5.4g of sodium hydroxide and 100g of TEABr and dissolve them in 365ml of deionized water, then add 144g of Y-type molecular sieve while stirring, and then add 10ml of concentrated ammonia water after mixing evenly, stir for half an hour, then add 195ml of silica sol, stir for 2 hours and then move to In a closed stainless steel reactor. Crystallized at 140° C. for 7 days to obtain product A of Y / Beta / ZSM-12 composite molecular sieve.

[0027] Raw material molar ratio: 1.07Na 2 O: 9.0 SiO2 : 1.5TEABr : 3.25NH 4 OH:Al 2 o 3 : 100H 2 O. Weigh 5.4g of sodium hydroxide and 100g of TEABr and dissolve them in 325ml of deionized water, then add 144g of Y-type molecular sieves while stirring, and then add 40ml of concentrated ammonia water after mixing evenly, stir for half an hour, then add 205ml of sili...

Embodiment 2

[0036] Get 75 grams of hydrogen type Y / Beta / ZSM-12 composite molecular sieves B prepared in Example 1, 104.2 grams of SB powder, 3.75 grams of scallop powder, mix well, then add 85ml deionized water and 3.75ml concentrated nitric acid (66.5wt% ) fully kneaded on a roller compactor to make it a paste-like plastic, extruded a cylindrical strip with a diameter of 1.5mm on an extruder, dried at 110°C for 8 hours, and then roasted at 550°C in an air atmosphere for 4 hours to obtain catalyst C2. The catalyst composition and evaluation results are shown in Table 2.

Embodiment 3

[0038] Get 105 grams of hydrogen-type Y / Beta / ZSM-12 composite molecular sieve C prepared in Example 1, 62.5 grams of SB powder, 3.75 grams of scallop powder, mix well, then add 100ml deionized water and 3.75ml concentrated nitric acid (66.5wt% ) fully kneaded on a roller compactor to make it a paste-like plastic, extruded a cylindrical strip with a diameter of 1.5mm on an extruder, dried at 110°C for 8 hours, and then calcined at 550°C for 4 hours in an air atmosphere to obtain catalyst C3. The catalyst composition and evaluation results are shown in Table 2.

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Abstract

The invention discloses a toluene disproportionation and transalkylation catalyst and a preparation method thereof. The catalyst consists of hydrogen type Y / Beta / ZSM-12 composite zeolite and inorganic refractory oxide, wherein the content of the composite zeolite is 10wt%-90wt%, and the silica alumina ratio of the composite zeolite is 5-30. The preparation method of the catalyst comprises the following steps: kneading hydrogen type Y / Beta / ZSM-12 composite zeolite, inorganic refractory oxide, peptizing acid, extrusion assistant and the like for shaping, drying, and roasting to obtain the catalyst. The preparation method of the toluene disproportionation and transalkylation catalyst is easy, the cost of the catalyst is low, the toluene conversion and B+C8A selectivity are higher, and the stability is good.

Description

technical field [0001] The invention relates to a toluene disproportionation and transalkylation catalyst and a preparation method thereof, in particular to a toluene disproportionation and transalkylation catalyst prepared by using a composite molecular sieve and a preparation method thereof. Background technique [0002] Toluene disproportionation and transalkylation technology is one of the most important processes in large-scale aromatics complexes, the purpose of which is to convert relatively surplus toluene and C 9 Aromatics are converted into benzene and xylenes, which are widely used but in short supply to meet market demand. In the chemical fiber-type modern aromatics complex, the toluene disproportionation unit plays a pivotal role, and its contribution to benzene and xylene accounts for 50% to 70% of the total benzene and xylene in the entire aromatics complex. [0003] Molecular sieve catalysts are usually used for the disproportionation of toluene and transalk...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C07C6/12C07C15/04C07C15/08
CPCY02P20/52
Inventor 贾立明张喜文秦波张志智刘全杰徐会青
Owner CHINA PETROLEUM & CHEM CORP
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