Toluene disproportionation and transalkylation catalyst and its preparation method and application

A technology of transalkylation and toluene disproportionation, which is applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of increasing catalyst preparation steps, increasing catalyst costs, etc., and achieves simple preparation methods, low cost, The effect of high toluene conversion

Active Publication Date: 2015-12-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the existing toluene disproportionation and transalkylation catalysts all use molecular sieve as the carrier, load a certain amount of active metal components or use 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 its preparation method and application
  • Toluene disproportionation and transalkylation catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Synthesis of ZSM-5 molecular sieve

[0023] In the first step, add sodium hydroxide and aluminum sulfate to deionized water, weigh tetrapropylammonium bromide and add it to the solution, stir for half an hour, add silica sol, stir evenly, and put it into a stainless steel crystallization kettle. Constant temperature crystallization at 180°C for 12 hours, then cooled to room temperature. The molar ratio of synthetic raw materials is based on the following substances: Al 2 o 3 :50SiO2 2 :15.6TPA + :11.1Na 2 O:4700H 2 O.

[0024]The second step is to stir the cooled mixture after crystallization, add aluminum sulfate after stirring evenly, stir for 2 hours, put it into a stainless steel crystallization kettle, crystallize at a constant temperature of 180°C for 18 hours, then cool to room temperature, wash, dry, Roasting to obtain ZSM-5 molecular sieve product A. Wherein the aluminum source that adds in the second step is 100% of the aluminum source amount descr...

Embodiment 2

[0032] Get 75g of hydrogen-type ZSM-5 molecular sieve B prepared in Example 1, 104.2g of SB powder, 3.75g of scallop powder, mix well, then add 85g of deionized water and 3.75ml of concentrated nitric acid (66.5wt%) and fully knead on a roller compactor , to make it into a paste-like plastic, extrude a cylindrical strip with a diameter of 1.5mm on an extruder, dry it at 110°C for 8 hours, and then bake it at 550°C for 4 hours in an air atmosphere to obtain catalyst C2. The catalyst composition and evaluation results are shown in Table 2.

Embodiment 3

[0034] Get 105g of hydrogen type SM-5 molecular sieve A prepared in Example 1, 62.5g of SB powder, and 3.75g of scallop powder, mix well, then add 100g of deionized water and 3.75ml of concentrated nitric acid (66.5wt%) and fully knead on a roller compactor , to make it into a paste-like plastic, extrude a cylindrical strip with a diameter of 1.5mm on an extruder, dry at 110°C for 8 hours, and then bake 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 and application thereof. The catalyst is composed of hydrogen-type ZSM-5 molecular sieve and an inorganic refractory oxide, the content of hydrogen-type ZSM-5 molecular sieve is 10 wt%-90 wt%, the molar ratio of silicon oxide to aluminium oxide is 20-100, the specific surface area is 350-550 m<2> / g, the molecular sieve possesses weak acids, strong acids and superacids at the same time, the total acid content is 0.25-0.82 mmol / g, the molar ratio of Bronsted acids to Lewis acids is 1.1-2.1, and the molar ratio of the acid content sum of strong acids and superacids to the acid content of weak acids is 1.2-2. The catalyst is employed for toluene disproportionation and transalkylation, and has the characteristics of high toluene conversion rate and high xylene selectivity.

Description

technical field [0001] The invention relates to a catalyst for toluene disproportionation and transalkylation, a preparation method and application 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 the transalkylation of aromatic hydrocarbons. At present, most of the industrialized catalysts use mordenite, Beta molecular sieve and ZSM-5 molec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C15/04C07C15/08C07C6/12
CPCY02P20/52
Inventor 秦波刘全杰尹泽群张志智张喜文
Owner CHINA PETROLEUM & CHEM CORP
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