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Toluene and methanol alkylation catalyst and preparation method and application thereof

A catalyst and alkylation technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems such as the reduction of xylene conversion rate, and achieve the improvement of toluene conversion rate and p-xylene selectivity, Suppresses the formation of by-products and improves selectivity

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of ZSM-5 molecular sieve with high silicon-aluminum ratio (silica-alumina molar ratio) in the surface layer, the catalyst prepared by it improves the selectivity of p-xylene, but it is also due to the high silicon-aluminum ratio ZSM-5 molecular sieve in the surface layer. Existence, sacrificing the acidity of the surface leads to a decrease in xylene conversion

Method used

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  • Toluene and methanol alkylation catalyst and preparation method and application thereof
  • Toluene and methanol alkylation catalyst and preparation method and application thereof
  • Toluene and methanol alkylation catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Weigh sodium hydroxide and sodium aluminate (Al 2 o 3 , 43wt%; Na 2 O, 38wt%) was dissolved in deionized water, and then the templating agent R (12-crown-4, content >97%) was added while stirring at a water bath temperature of 60°C, and after stirring for 0.5 hours, white carbon black was added, After stirring for 1 hour, add seed crystal S, continue stirring for 2 hours, and then move to a closed stainless steel reaction kettle.

[0036] (2) Crystallized at 160°C for 6 days, the obtained crystallized product was analyzed as ZSM-48 molecular sieve by XRD analysis, the specific raw material ratio and product properties are shown in Table 1.

Embodiment 2

[0038] (1) Same as step (1) of Example 1.

[0039] (2) Crystallized at 158°C for 8 days, the obtained crystallized product was analyzed as ZSM-48 molecular sieve by XRD analysis, the specific raw material ratio and product properties are shown in Table 1.

Embodiment 3

[0041] (1) Same as step (1) of Example 1, the temperature of the water bath is 80°C.

[0042] (2) Crystallize at 160°C for 5 days, and the obtained crystallized product is ZSM-48 molecular sieve by XRD analysis. The specific raw material ratio and product properties are shown in Table 1.

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Abstract

The invention discloses a toluene and methanol alkylation catalyst and a preparation method and application thereof. A catalyst carrier contains a hydrogen-type ZSM-48 molecular sieve and a modified element which comprises one or several of lanthanum, magnesium, phosphorus and silicon, the content (in percentage by weight ) of the hydrogen-type ZSM-48 molecular sieve in the carrier is 10wt%-90wt%, and preferably 20wt%-80wt%; the modified element contains one or several of lanthanum, magnesium, phosphorus and silicon and is calculated according to oxides, and the modified element accounts for 0.05%-60% of the weight of the carrier, and preferably 0.5%-40%. The catalyst is used for an alkylation reaction of toluene and methanol, and has the characteristics that the conversion rate of the toluene is high, the selectivity of paraxylene is high, and the like.

Description

technical field [0001] The invention relates to a catalyst for the alkylation of toluene and methanol as well as its preparation method and application. Background technique [0002] Paraxylene (PX) is one of the main basic organic raw materials in the petrochemical industry, and it has a wide range of uses in many chemical production fields such as chemical fibers, synthetic resins, pesticides, medicines, and plastics. In recent years, with the rapid increase of terephthalic acid (PTA) production capacity, the supply of p-xylene in my country is in short supply and the price remains high. [0003] The source of p-xylene is mainly obtained from petroleum reforming products, C9 aromatics of pyrolysis gasoline coking benzene, and mixed xylene obtained from the disproportionation reaction of toluene. A small amount derived from the transalkylation of trimethylbenzene. Since petroleum resources are limited, and the average ratio of naphtha as a reforming raw material in petrol...

Claims

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Application Information

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IPC IPC(8): B01J29/70C07C15/08C07C2/86
CPCY02P20/52
Inventor 秦波杜艳泽柳伟张晓萍
Owner CHINA PETROLEUM & CHEM CORP
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