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Preparation and application of high-performance toluene side-chain alkylation catalyst

A catalyst and alkaline technology, applied in the field of dual-function catalysts, can solve the problem of low conversion rate of toluene, and achieve the effect of high conversion rate of toluene, good stability and high selectivity of styrene

Active Publication Date: 2016-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CsX molecular sieves have the best catalytic activity among similar catalysts, the conversion rate of toluene is still low, which is the main factor limiting the industrial application of toluene methanol side chain alkylation process

Method used

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  • Preparation and application of high-performance toluene side-chain alkylation catalyst
  • Preparation and application of high-performance toluene side-chain alkylation catalyst
  • Preparation and application of high-performance toluene side-chain alkylation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation of embodiment 1 basic molecular sieve sample

[0038] The alkali metal type molecular sieves used in the examples were purchased commercially.

[0039] Alkali metal X-type molecular sieve:

[0040] Take 80 g of NaX molecular sieves with a silicon-aluminum ratio (Si / Al) of 1.17, divide them into four parts on average by mass, exchange them with 100 ml of 0.5 mol / LCsOH solution at 80 °C for 1 to 4 times, wash with deionized water and suction filter to Dry the filtrate overnight at 120°C until the filtrate is neutral, roast in air at 550°C for 4 hours, and replace the samples for 1 to 4 times as Z-1 # , Z-2 # , Z-3 # , Z-4 # .

[0041] Alkali metal Y-type molecular sieve:

[0042] Take 20g of NaY molecular sieve with a silicon-aluminum ratio (Si / Al) of 2.13, exchange it with 100ml of 0.5mol / L CsOH solution for 3 times at 80°C, dry at 120°C overnight, and roast at 550°C for 4h. The sample is recorded as Z- 5 # .

[0043] Take 20g each of NaY mole...

Embodiment 2

[0048] The preparation of embodiment 2 metal oxide samples

[0049] Isometric impregnation method:

[0050] First vacuumize the carrier to be impregnated, and then use deionized water to measure the saturated adsorption capacity of the carrier to deionized water. Calculate the mass of the required impregnation precursor according to the loading amount, dissolve the corresponding mass of the precursor in the deionized water of the mass required for the carrier's saturated adsorption, and stir evenly to prepare the impregnation solution. After impregnating in equal volume at room temperature for 24 hours, it was dried at 120°C and baked in air at 550°C for 4 hours for later use. The types and loading amounts of loaded oxides and loaded precursors are shown in Table 2.

[0051] Table 2

[0052] sample

[0053] *: B-type SiO in carrier 2 Refers to B-type silica gel.

Embodiment 3

[0054] The preparation of embodiment 3 catalyst samples

[0055] The basic molecular sieve sample Z-1 prepared by embodiment 1 # ~Z-8 # At least one of and metal oxide sample AC-1 # ~AC-10 # Mix at least one of them, take 20-40 mesh, and the obtained catalyst is recorded as CAT-1 # ~CAT-13 #. of which CAT-1 # ~CAT-14 # Ball milled on a QM-3SP2 ball mill for 20 hours; CAT-15 # Homogenized by mechanical mixing; CAT-16 # Grind separately and mix evenly before molding the catalyst.

[0056] Table 3 shows the relationship between the numbers of the obtained bifunctional catalyst samples and the types and mass ratios of the basic molecular sieve samples and metal oxide samples contained therein.

[0057] table 3

[0058] sample

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Abstract

The invention provides a preparation and application of a high-performance toluene side-chain alkylation catalyst. The catalyst can greatly improve the conversion rate of toluene while keeping a high selectivity of styrene in products in a toluene-methanol side chain alkylation reaction system, and is characterized by comprising a basic molecular sieve and a supported alkali metal oxide, wherein the basic molecular sieve is an alkali metal molecular sieve with an FAU structure; the supported alkali metal oxide comprises a carrier and the alkali metal oxide supported on the carrier. The invention further provides the application of the catalyst to preparation of the styrene by toluene and methanol and reaction of ethylbenzene.

Description

technical field [0001] The invention relates to a bifunctional catalyst, its preparation method and its application in the reaction of producing styrene from toluene and methanol and co-producing ethylbenzene. Background technique [0002] Styrene can be used to produce SBR rubber, ABS plastic, SBN resin, etc. It is an important raw material for synthetic rubber and plastic industries. The current mainstream styrene production route is the ethylbenzene dehydrogenation method. This process has problems such as large equipment investment, many side reactions, and high energy consumption. Therefore, people have strong interests in the development of new styrene production processes. [0003] In 1967, a process for producing styrene by side-chain alkylation of toluene and methanol was first reported. This process is considered to have important industrial application value. The reaction requires both acidity and alkalinity provided by the catalyst. Among many types of catalysts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08C07C2/88C07C15/46C07C15/073
CPCB01J29/082B01J29/084B01J2229/18C07C2/88C07C2529/08C07C15/46C07C15/073C07C2/86B01J29/08
Inventor 许磊李沛东徐力张晓敏袁扬扬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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