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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 production cost

Inactive Publication Date: 2004-12-29
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
  • Catalyst for alkyl aromatics dehydrogenation

Examples

Experimental program
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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 alumina, 12 grams of cement, and 8 grams of carboxymethyl cellulose. Water, wet ingredients are kneaded to a dough-like shape suitable for extrusion. Extruded and cut into pellets with a diameter of 3 mm and a strip length of about 5 mm. Aged at room temperature for 8 hours, put in an oven, dried at 80°C for 4 hours, placed in a roasting furnace, and roasted at 800°C for 2 hours to obtain a finished catalyst. 100 ml of the 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 abrasion rate of the catalyst were measured. Test results: the conversion rate of ethylbenzene is 75.1%, the selectivity of styrene is 94.3%, the single charge of styrene is 70.8%, the crushing resistance is 100...

Embodiment 2

[0026] Mix 210g red iron oxide, 120g yellow iron oxide, 56g potassium carbonate, 35g cerium oxide, 15g lithium carbonate, 6g tungsten oxide, 11g magnesium oxide, 20g cement, 8g 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 of 74.5%, styrene selectivity of 95.1%, styrene yield of 70.8%, crush resistance of 100 Newtons, and wear rate of 1%.

Embodiment 3

[0028] Mix 210g red iron oxide, 120g yellow iron oxide, 61g potassium carbonate, 35g cerium oxide, 15g lithium carbonate, 6g tungsten oxide, 11g magnesium oxide, 2g molybdenum oxide, 4g copper oxide, 2g Lead oxide, 2 grams of tin oxide, 20 grams of cement, and 8 grams of carboxymethyl cellulose were mixed uniformly, and an appropriate amount of deionized water was added, and the method was prepared and measured according to the method of Example 1. Test results: ethylbenzene conversion rate of 75.1%, styrene selectivity of 95.2%, styrene yield of 71.5%, crush resistance of 121 Newtons, and abrasion rate of 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 present invention relates to a catalyst for dehydrogenation of alkyl aromatic hydrocarbons, in particular to a catalyst for dehydrogenation of ethylbenzene to styrene. Background technique [0002] In industry, alkenyl aromatic hydrocarbons are mainly obtained from the dehydrogenation of alkyl aromatic hydrocarbons, so the selection of a highly active dehydrogenation catalyst is one of the keys. At present, the iron-potassium system catalysts used for the dehydrogenation of alkyl aromatics are roughly divided into two categories: one is catalysts with high potassium content and high activity, such as CN1047097C, CN1050535C, CN1226462A, CN1298856A. The catalyst reported in patent CN1047097C can achieve 78.3% ethylbenzene conversion, 73.9% styrene single charge and 94.4% styrene selectivity at 600°C. The catalyst of patent CN1050535C has a conversion rate of 79.1% of ethylbenzene, 76.0% of styrene yield and 96.1% of s...

Claims

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Application Information

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Patent Type & Authority Patents(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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