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Method for production of ethylbenzene through liquid phase transalkylation of polyethylbenzene and benzene

A polyethylbenzene, transalkylation technology, applied in chemical instruments and methods, hydrocarbons, molecular sieve catalysts, etc., can solve the problems of poor catalyst stability, low ethylbenzene selectivity, and short regeneration cycle.

Inactive Publication Date: 2012-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problems of low ethylbenzene selectivity, poor catalyst stability and short regeneration cycle in the prior art, and a new method for producing ethylbenzene by liquid-phase transalkylation of polyethylbenzene and benzene is provided

Method used

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  • Method for production of ethylbenzene through liquid phase transalkylation of polyethylbenzene and benzene
  • Method for production of ethylbenzene through liquid phase transalkylation of polyethylbenzene and benzene
  • Method for production of ethylbenzene through liquid phase transalkylation of polyethylbenzene and benzene

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Experimental program
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Effect test

Embodiment 1

[0023] Weigh 100 grams of deionized water and pour it into a polytetrafluoroethylene cup. Then weigh 14 grams of sodium metaaluminate solid and dissolve it under stirring. After the sodium metaaluminate is completely dissolved, add 8 grams of NaOH to dissolve. Then weigh 120 grams of tetraethylammonium bromide, and dissolve it in a polytetrafluoroethylene cup with stirring. After all dissolved, 300 g of 40% silica sol was added under vigorous stirring. Finally, 80 grams of deionized water was added. After stirring for half an hour, it was transferred to a crystallization kettle for dynamic crystallization at 150°C for 3 days. Slurry, filter and wash with deionized water to a pH of less than 10. Finally, it was dried at 110°C for later use.

[0024] Weigh 50 grams of the above-prepared zeolite beta raw powder, and add it into the prepared aqueous sodium hydroxide solution with a weight concentration of 0.1%. Stir with a magnetic stirrer for 5 hours at 95°C, centrifuge, fi...

Embodiment 2～6

[0027] With [embodiment 1], only the condition of alkali treatment in the process is different. See Table 1 for details.

[0028] Table 1

[0029]

Embodiment 7

[0031] The catalyst activity was examined in a fixed-bed reactor from bottom to top, and the reactor was a stainless steel tube with an inner diameter of 28 mm and a length of 800 mm. The catalyst load was 6 grams and diluted with glass beads.

[0032] After loading the catalyst of [Example 1-7] into the reactor, the catalyst was activated under the protection of nitrogen, and activated at 400° C. for 1 hour. Then cool to below 40°C, stop nitrogen purging, start to feed the transalkylation material, and start to heat up to the reaction temperature after the pressure reaches the set value.

[0033] The reaction conditions are: temperature 220°C, pressure 3.0MPa, total liquid space velocity 2 hours -1 , The weight ratio of benzene to diethylbenzene is 8:1. After the system was stabilized, the liquid product was taken regularly for chromatographic analysis. The following data are the stable data of feeding for 10 hours, see Table 2 for details.

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Abstract

The invention relates to a method for production of ethylbenzene through liquid phase transalkylation of polyethylbenzene and benzene, and mainly solves the problems of low ethylbenzene selectivity, poor catalyst stability, and short regeneration cycle existing in the prior art. The method of the invention consists of: adopting polyethylbenzene and benzene as reaction raw materials, and under the conditions of a reaction temperature of 180-280DEG C, a reaction pressure of 2.0-4.5MPa, a liquid phase weight hourly space velocity of 0.5-10h<-1>, and a weight ratio of benzene to polyethylbenzene of 3-10, contacting the reaction raw materials with a catalyst to undergo a liquid phase transalkylation reaction so as to produce ethylbenzene. Specifically, the catalyst comprises the following components by weight: a) 30-90 parts of a beta type molecular sieve; and b) 10-70 parts of a binder, wherein the beta type molecular sieve is obtained by making beta type molecular sieve raw powder undergo steps including at least one alkali treatment. The technical scheme employed in the invention well solves the problems, and can be used for the industrial production of ethylbenzene through liquid phase transalkylation of polyethylbenzene and benzene.

Description

technical field [0001] The invention relates to a method for producing ethylbenzene by liquid-phase transalkylation of polyethylbenzene and benzene. Background technique [0002] Ethylbenzene is an important organic chemical raw material, and it is mainly used as a raw material for the production of styrene in industry. Ethylbenzene is mainly produced by the alkylation reaction of benzene and ethylene, and the alkylation process is generally divided into gas-phase molecular sieve method and liquid-phase molecular sieve method. Regardless of the alkylation process of the gas-phase molecular sieve method or the liquid-phase molecular sieve method, since the reaction product ethylbenzene can continue to undergo alkylation reaction with ethylene like the raw material benzene to form polyethylbenzenes such as diethylbenzene, triethylbenzene, tetraethylbenzene, etc. components, so modern industrial production of ethylbenzene has established independent transalkylation reactors, a...

Claims

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Application Information

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IPC IPC(8): C07C15/073C07C6/12B01J29/70
CPCY02P20/584
Inventor 宦明耀孙洪敏杨为民张斌沈震浩贺健
Owner CHINA PETROLEUM & CHEM CORP
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