Alkaline molecular sieve catalyst for preparing styrene

A styrene and catalyst technology, applied in the field of basic molecular sieve catalysts, can solve the problems of catalysts with weak alkalinity, easily damaged structure, and poor stability, and achieve the effect of improving alkalinity and stability

Active Publication Date: 2010-01-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the catalysts in the prior art have weak alkalinity

Method used

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  • Alkaline molecular sieve catalyst for preparing styrene
  • Alkaline molecular sieve catalyst for preparing styrene
  • Alkaline molecular sieve catalyst for preparing styrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 50 grams of 20-40 mesh silicon-aluminum molar ratio SiO that has been pressed into tablets 2 / Al 2 o 3 The Y-type zeolite molecular sieve of 3.5 is exchanged with 0.1 mol / liter of cesium acetate as the exchange liquid. Exchange at 90°C for 3 times with a solid-to-liquid ratio of 15, and each exchange time is 2 hours. Afterwards, wash and dry at 120°C for 4 hours. The molecular sieve was calcined at 650°C for 4 hours, and then cooled in a desiccator to obtain a CsY molecular sieve.

[0023] The obtained CsY molecular sieve is put into a tube furnace, and the ammonia gas which has been dehydrated and deoxidized is passed through to carry out high-temperature nitriding. The ammonia gas flow rate was 130 ml / min, the temperature of ammonia gas treatment was 400° C., and the time of ammonia gas treatment was 4 hours.

[0024] The obtained above-mentioned catalyst was loaded into the reactor, and the charging amount was 5.0 grams. At normal pressure, the raw materia...

Embodiment 2

[0026] The CsY-type molecular sieve prepared according to Example 1 was placed in a tube furnace, and ammonia gas that had been dehydrated and deoxidized was passed through to carry out high-temperature nitriding. The ammonia gas flow rate is 120 ml / min, the temperature for nitriding, that is, ammonia gas treatment, is 500° C., and the nitriding time is 8 hours.

[0027] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.

Embodiment 3

[0029] The CsY-type molecular sieve prepared according to Example 1 was placed in a tube furnace, and ammonia gas that had been dehydrated and deoxidized was passed through to carry out high-temperature nitriding. The ammonia flow rate is 80 ml / min, the nitriding temperature is 750° C., and the nitriding time is 6 hours.

[0030] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.

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Abstract

The invention relates to an alkaline molecular sieve catalyst for preparing styrene, which mainly solves the problems that in the prior art, a catalyst has weak alkalescence, a vulnerable structure and poor stability. Through a technical scheme that an alkaline molecular sieve subjected to alkalis exchange is treated by ammonia under the condition of a temperature between 350 and 900 DEG C, the alkaline molecular sieve catalyst wells solves the problem and can be used in industrial preparation of the styrene catalyst through toluene-methanol side chain alkylation.

Description

technical field [0001] The invention relates to a basic molecular sieve catalyst for preparing styrene, in particular to a catalyst for side chain alkylation of toluene and methanol to synthesize styrene. Background technique [0002] Styrene monomer (SM) is the simplest but most important species in the series of unsaturated aromatic hydrocarbon monomers. It is an important raw material for synthetic rubber and plastic industries. At present, the industrial SM production methods all use ethylbenzene as the raw material, including ethylbenzene catalytic dehydrogenation method and ethylbenzene co-oxidation co-production SM / PO method. Catalytic dehydrogenation of ethylbenzene is the dominant technical route for the production of styrene, but the process is long and the cost of raw materials accounts for 85% of the variable cost of SM production, resulting in high production costs. The joint production method is greatly affected by the joint product market conditions, and the ...

Claims

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Application Information

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IPC IPC(8): B01J29/08C07C15/46C07C2/86
Inventor 危春玲杨为民缪长喜宋磊陈铜朱敏
Owner CHINA PETROLEUM & CHEM CORP
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