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Preparation method of catalyst paraxylene by methylbenzene alkylate

A technology of paraxylene and toluene alkyl, applied in the field of preparation of molecular sieve catalysts, can solve the problems of complicated preparation process, large amount of solvent, high cost, etc., and achieve the effects of avoiding the use of water and solvent, simple equipment and saving resources.

Active Publication Date: 2018-02-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a catalyst for the alkylation of toluene to produce p-xylene, which overcomes the shortcomings of existing catalysts such as complicated preparation process, excessive solvent consumption, waste of a large amount of water for post-treatment, high cost, etc.

Method used

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  • Preparation method of catalyst paraxylene by methylbenzene alkylate
  • Preparation method of catalyst paraxylene by methylbenzene alkylate
  • Preparation method of catalyst paraxylene by methylbenzene alkylate

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 0.80g fumed silica, 0.125g templating agent TPABr and 0.125g NH 4 Grind F in a mortar for 2 minutes, then add 0.08g ZSM-5 molecular sieve, continue to grind for 6 minutes at room temperature, then pour the raw material into a 50mL synthesis kettle, stand for crystallization at 175°C for 24 hours, cool and wash with water , dried, and calcined at 500° C. for 12 hours to obtain a catalyst. Such as figure 1 As shown in a and 1b, it can be seen that the morphology and size of the crystals in the sample are basically consistent with those of ZSM-5 before modification; figure 1 c shows that this sample has the same typical MFI structure as ZSM-5; from figure 1 d It can be seen that the acid content of the catalyst after the reaction is reduced compared with that of ZSM-5, which mainly reduces the acid content on the outer surface of ZSM-5.

[0026] Toluene and methanol are used as raw materials, and the prepared catalyst powder is pressed into 20-40 mesh particles as...

Embodiment 2

[0031] Same as in Example 1, static crystallization at 175° C. for 6 h.

[0032] Take 0.3 g of the catalyst to carry out toluene alkylation reaction according to the reaction conditions of Example 1, and the results are shown in Table 1.

Embodiment 3

[0034] Same as Example 1, crystallization at 175°C for 48 hours.

[0035] Take 0.3 g of the catalyst to carry out toluene alkylation reaction according to the reaction conditions of Example 1, and the results are shown in Table 1.

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Abstract

The invention discloses a preparation method of catalyst paraxylene by methylbenzene alkylate. The method includes steps of grinding and mixing a ZSM-5 molecular sieve and a solid raw material prepared from silicon dioxide, template and ammonium fluoride at a certain ratio for a period time under the room temperature; pouring the raw material in a synthesis reactor to heat and crystalize for a period of time; roasting the product and removing the template to obtain the catalyst. The catalyst is applicable to prepare paraxylene through methylbenzene methyl alcohol alkylation reaction; the selectivity of the target product paraxylene is up to 88.33% under the condition that the methylbenzene conversion rate is 24.43%; the catalyst is prepared by a solid phase method; the method is simple inoperation, few in waste fluid and good in industrial application prospect.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve catalyst, in particular to a preparation method of a catalyst used for the alkylation of toluene and methanol to produce p-xylene using a solid-phase method. Background technique [0002] Para-xylene is one of the basic organic raw materials in the petrochemical industry. It can produce purified terephthalic acid (PTA) or dimethyl terephthalate (DMT). PTA or DMT reacts with ethylene glycol to form polyethylene terephthalic acid. Ethylene glycol ester (PET), namely polyester, is further processed and spun to produce polyester fiber, polyester resin and polyester cord for the tire industry. In recent years, with the rapid growth of the national economy and the continuous development of chemical, polyester and other related industries, the domestic consumption of p-xylene has shown a rapid growth trend, and the domestic self-sufficiency rate is only 60%. With the growth of consumer demand...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C2/86C07C15/08
CPCB01J29/40C07C2/864C07C2523/40C07C15/08Y02P20/52
Inventor 王正宝刘闯张俊佳龙奕华
Owner ZHEJIANG UNIV
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