Composite type catalyst, preparation method of composite type catalyst and application in methylbenzene

A supported catalyst and a catalyst technology, applied in the field of catalysis, can solve the problems of low utilization rate of methanol, high ethylbenzene content, hindering the industrial application of the toluene-methanol side chain alkylation process, etc., and achieve the effect of improving the conversion rate of toluene

Active Publication Date: 2019-04-26
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

[0005] US 4483936 reported that the X-type molecular sieve modified by alkali metal Cs and Rb has higher activity, and the X-type molecular sieve modified by direct impregnation with CsOH has the best activity, and the X-type molecular sieve modified by Cs single component has a styrene selectivity of 30%. Above, the total yield reaches more than 10%. This type of alkali metal significantly enhances the surface alkalinity of the molecular sieve and improves the catalytic performance, but it does not solve the problem of catalyst stability.
US 4115424 and US 5015796 report that adding a small amount of boron or phosphorus in the X-type molecular sieve of alkali metal ion exchange can improve the selectivity of styrene and improve the stability of the reaction at the same time, although the X-type molecular sieve is loaded with boron, its reaction temperature is greatly reduced , but there is still the problem of low styrene yield
CN 101623650A adopts K or Cs nitrate, acetate, carbonate and chloride to perform ion exchange on X or Y type molecular sieve, and supports boron, phosphorus and at l

Method used

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  • Composite type catalyst, preparation method of composite type catalyst and application in methylbenzene
  • Composite type catalyst, preparation method of composite type catalyst and application in methylbenzene
  • Composite type catalyst, preparation method of composite type catalyst and application in methylbenzene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Embodiment 1 basic molecular sieve catalyst sample E-1 # ~E-10 # preparation of

[0082] Alkali metal ion exchanged molecular sieve sample E-1 # ~E-10 # The preparation comprises the following steps:

[0083] Weigh 30 g of molecular sieves, and perform ion exchange on the molecular sieves with the precursor solution. When the ion exchange solid-to-liquid ratio is 10:1, exchange at 80° C. for 4 hours. After suction filtration, washing and drying, the obtained solid was calcined in a muffle furnace at 550° C. for 6 hours. Repeat the above process twice, and the obtained sample is marked as E-1 # ~E-10 # .

[0084] The obtained sample number, precursor solution, solution concentration and ion exchange degree are shown in Table 1. Adopt XRF elemental analyzer to obtain sample E-1 # ~E-10 # Perform elemental analysis.

[0085] Table 1

[0086] Sample serial number

Embodiment 2

[0087] Embodiment 2 boron-containing catalyst sample BR-1 # ~BR-6 # preparation of

[0088] Boron-containing catalyst sample BR-1 # ~BR-6 # The preparation method is as follows:

[0089] Firstly, the boride is ground, then dried at 110°C and fired at 550°C for 6 hours. Obtain metal boride, sample number is BR-1 # ~BR-6 # .

[0090] The obtained sample numbers, types of metal borides and mixing ratios of metal borides are shown in Table 2. Wherein the mixing ratio is calculated according to the mass of the metal boride.

[0091] Table 2

[0092] Sample serial number

Embodiment 3

[0093] Embodiment 3 boron-containing catalyst sample BR-7 # ~BR-12 # preparation of

[0094] Boron-containing catalyst sample BR-7 # ~BR-12 # The preparation method is as follows:

[0095] Firstly, the borohydride compound is ground, then dried at 110°C and calcined at 550°C for 6 hours to obtain the borohydride compound, the sample number is BR-7 #~BR-12 # .

[0096] The obtained sample numbers, types of borohydride compounds, and mixing ratios of borohydride compounds are shown in Table 3. Wherein the mixing ratio is calculated according to the mass of the borohydride compound.

[0097] table 3

[0098] Sample serial number

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Abstract

The invention discloses a composite type catalyst, a preparation method of the composite type catalyst and application in methylbenzene. The composite type catalyst is prepared from alkaline molecularsieve based catalysts, alkali metal refractory salt and a boracic type catalyst; and the alkali metal refractory salt is loaded on the alkaline molecular sieve based catalysts. The composite type catalyst is used for methylbenzene and the process of preparing styrene by using methyl alcohol, and the methylbenzene percent conversion, methyl alcohol use ratio and styrene yield can be effectively improved. On the other hand, the invention further provides the preparation method and application of the composite type catalyst.

Description

technical field [0001] The invention relates to a composite catalyst, its preparation method and its application in side chain alkylation of toluene and methanol, belonging to the field of catalysis. Background technique [0002] As an important monomer of polymers, styrene is mainly used in the production of chemical products such as polymers. The traditional styrene production technology is ethylbenzene dehydrogenation method, which has a series of problems such as long process route, large equipment investment, many side reactions, high energy consumption and excessive dependence on petroleum resources. Therefore, the new styrene production process has received widespread attention. [0003] Compared with the traditional styrene production technology, the side-chain alkylation of toluene and methanol to styrene has a wide range of raw materials, omits the dehydrogenation step, reduces energy consumption and cost, and chooses methanol as the alkylation agent to reduce the...

Claims

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Application Information

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IPC IPC(8): B01J29/08B01J29/16B01J27/188C07C2/86C07C15/46
CPCB01J21/04B01J21/063B01J21/066B01J21/08B01J21/18B01J23/02B01J23/04B01J27/188B01J29/082B01J29/084B01J29/163B01J29/166B01J31/146B01J35/0006B01J2229/18C07C2/864C07C2529/08C07C2529/16C07C15/46Y02P20/52
Inventor 韩乔李沛东许磊徐力袁扬扬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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