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A kind of toluene disproportionation and transalkylation catalyst and its application

A technology of transalkylation and toluene disproportionation, applied in physical/chemical process catalysts, molecular sieve catalysts, organic chemistry and other directions, can solve the problems of increasing catalyst cost, increasing catalyst preparation steps, etc., and achieves low catalyst cost, simple preparation method and high efficiency. Effect of Toluene Conversion

Active Publication Date: 2011-11-30
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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  • A kind of toluene disproportionation and transalkylation catalyst and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Synthesis of Y-Beta Composite Molecular Sieve

[0022] Prepared according to Embodiment 4 of Chinese Patent CN1944254A.

[0023] In the first step, add 0.45g of sodium hydroxide, 9.0g of TEABr (tetraethylammonium bromide), 3.0ml of concentrated ammonia water, and 10.1ml of distilled water in sequence, and stir magnetically for 0.5 hours.

[0024] In the second step, 15.0 g of high silica Y zeolite powder and 25 ml of distilled water were added to the above solution, and magnetically stirred for 1 hour.

[0025] In the third step, 12.0ml of silica sol (SiO 2 content 5.80mol / L) into the above solution, then add 1.0ml concentrated ammonia water, mix and stir for 1-2 hours to form a uniform white jelly, put it into a 150ml stainless steel reaction kettle, and crystallize at 140°C for 5 days Take it out, wash until the solution is neutral, and then dry it. The prepared sample was roasted at 550°C for 5h to remove the organic amine tetraethylammonium bromide. The Y-Be...

Embodiment 2

[0033] Get 75 grams of the hydrogen-form Y-Beta composite molecular sieve B prepared in Example 1, 104.2 grams of SB powder, and 3.75 grams of squash powder, mix well, then add 85ml of deionized water and 3.75ml of concentrated nitric acid (66.5w%) in rolling Fully kneaded on the machine to make it into a paste-like plastic, extruded a cylindrical rod with a diameter of 1.5mm on the extruder, dried at 110°C for 8 hours, and then calcined 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

[0035]Get 105 grams of hydrogen-type Y-Beta composite molecular sieve C prepared in Example 1, 62.5 grams of SB powder, and 3.75 grams of scallop powder, mix well, then add 100ml of deionized water and 3.75ml of concentrated nitric acid (66.5w%) in roller compaction Fully kneaded on the machine to make it into a paste-like plastic, extruded a cylindrical rod with a diameter of 1.5mm on the 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 catalyst for toluene disproportionation and transalkylation, comprising a hydrogen type Y-Beta composite molecular sieve and an inorganic refractory oxide, wherein the content of the hydrogen type Y-Beta composite molecular sieve in the catalyst is 10 wt%-90 wt%. The catalyst for toluene disproportionation and transalkylation is applied to the process of preparing benzene and dimethylbenzene by using toluene and C9 aromatic hydrocarbon as raw materials; by adopting a fixed bed process and appropriate process conditions, higher toluene transforming rate and B+C8A selectivity and favorable stability can be obtained.

Description

technical field [0001] The invention relates to a toluene disproportionation and transalkylation catalyst and its application, in particular to a toluene disproportionation and transalkylation catalyst using a composite molecular sieve and its application. 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 transalkylation of aromatic hydrocarbons. At p...

Claims

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Application Information

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