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Catalyst for alkyl aromatics dehydrogenation

A technology for alkyl aromatic hydrocarbons and catalysts, which is applied in the field of catalysts for ethylbenzene dehydrogenation to styrene, can solve the problems of reduced crush resistance of catalyst particles, low catalytic activity and high potassium content, and achieves high crush resistance, high The effect of low styrene yield and preparation cost

Inactive Publication Date: 2004-04-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the potassium content in the catalyst is high in the prior art, and the catalyst particles are easy to cause potassium loss during operation, resulting in a reduction in the crush resistance of the catalyst particles, or a low catalytic activity of the catalyst at low potassium content problem, to provide a new catalyst for the dehydrogenation of alkylaromatics

Method used

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  • Catalyst for alkyl aromatics dehydrogenation
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Examples

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Effect test

Embodiment 1

[0024] Mix 300 grams of red iron oxide, 53 grams of potassium carbonate, 35 grams of cerium oxide, 15 grams of lithium carbonate, 11 grams of magnesium oxide, 5 grams of aluminum oxide, 12 grams of cement, and 8 grams of carboxymethyl cellulose, and add an appropriate amount of deionized Water, wet ingredients kneaded to a dough-like material suitable for extruding. Extrude and cut into pellets with a diameter of 3 mm and a length of about 5 mm. Aged at room temperature for 8 hours, placed in an oven, dried at 80°C for 4 hours, placed in a calcination furnace, and calcined at 800°C for 2 hours to obtain a finished catalyst. 100 ml of catalyst was loaded into the evaluation reactor, and the catalytic activity was evaluated at a reaction temperature of 610°C and a water ratio of 2.0, and the crush resistance and wear rate of the catalyst were measured. Test results: the conversion rate of ethylbenzene is 75.1%, the selectivity of styrene is 94.3%, the yield of styrene is 70.8%,...

Embodiment 2

[0026] Mix 210 grams of iron oxide red, 120 grams of iron oxide yellow, 56 grams of potassium carbonate, 35 grams of cerium oxide, 15 grams of lithium carbonate, 6 grams of tungsten oxide, 11 grams of magnesium oxide, 20 grams of cement, and 8 grams of carboxymethyl cellulose Evenly, add an appropriate amount of deionized water, prepare and measure according to the method of Example 1. Test results: Ethylbenzene conversion rate 74.5%, styrene selectivity 95.1%, styrene yield 70.8%, crush resistance 100 Newton, wear rate 1%.

Embodiment 3

[0028] 210 grams of iron oxide red, 120 grams of iron oxide yellow, 61 grams of potassium carbonate, 35 grams of cerium oxide, 15 grams of lithium carbonate, 6 grams of tungsten oxide, 11 grams of magnesium oxide, 2 grams of molybdenum oxide, 4 grams of copper oxide, 2 grams Lead oxide, 2 grams of tin oxide, 20 grams of cement, and 8 grams of carboxymethyl cellulose were mixed evenly, and an appropriate amount of deionized water was added, prepared and measured according to the method in Example 1. Test results: Ethylbenzene conversion rate 75.1%, styrene selectivity 95.2%, styrene yield 71.5%, crush resistance 121 Newton, wear rate 0.2%.

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Abstract

A catalyst for dehydrogenating the alkylhydrocarbon features that the lithium oxide and tungsten oxide are added to existing Fe-K-Ce-Mo catalyst system to increase the compression strength of catalyst and prevent loss of K. Its advantage is high activity under low conten of K.

Description

technical field [0001] The invention relates to a catalyst for the dehydrogenation of alkylaromatic hydrocarbons, in particular to a catalyst for the dehydrogenation of ethylbenzene to produce styrene. Background technique [0002] In industry, alkenyl aromatics are mainly produced by the dehydrogenation of alkyl aromatics, so choosing a highly active dehydrogenation catalyst is one of the keys. At present, the iron-potassium system catalysts used for the dehydrogenation of alkylaromatics are roughly divided into two categories: one is catalysts with high potassium content and higher activity, such as CN1047097C, CN1050535C, CN1226462A, and CN1298856A. The catalyst reported in the patent CN1047097C has a conversion rate of ethylbenzene of 78.3%, a yield of styrene of 73.9%, and a selectivity of styrene of 94.4% under the condition of 600°C. The catalyst of the patent CN1050535C has an ethylbenzene conversion rate of 79.1%, a styrene yield of 76.0%, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888C07C5/333C07C15/46
Inventor 范勤毛连生倪军平
Owner CHINA PETROLEUM & CHEM CORP
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