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Low-water ratio alkyl aromatics dehydrogenation catalyst

A technology for dehydrogenation catalysts and alkylaromatics, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve low-potassium catalysts with low strength, stability and selection gender issues

Active Publication Date: 2007-06-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the low strength of low-potassium catalysts in the prior art, poor stability and selectivity under low water ratio conditions, and a new low water ratio alkylaromatic dehydrogenation catalyst is provided

Method used

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  • Low-water ratio alkyl aromatics dehydrogenation catalyst
  • Low-water ratio alkyl aromatics dehydrogenation catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 280.0 grams of iron oxide red, 100.0 grams of iron oxide yellow, 70.0 grams of potassium carbonate, 76.0 grams of cerium nitrate, 8.6 grams of ammonium molybdate, 6.0 grams of magnesium oxide, 2.9 grams of tungsten trioxide, 4.0 grams of strontium oxide, 4.0 grams of copper oxide, Stir 1.2 grams of manganese oxide and 17.0 grams of carboxymethyl cellulose in a kneader for 1 hour, add deionized water, and stir for another half an hour, take out the extruded strips, extrude them into particles with a diameter of 3 mm and a length of 5 to 10 mm, and put them in Oven, bake at 80°C for 2 hours, bake at 120°C for 2 hours, then place in a muffle furnace, and bake at 900°C for 4 hours to obtain the finished catalyst.

[0037] 100 milliliters of catalysts are loaded into the reactor, at normal pressure, liquid space velocity 1.0 hours -1 , 620°C, and water ratio (weight) 1.7 to conduct activity evaluation, and measure the crushing strength of the catalyst. The test results are l...

Embodiment 2

[0039] Prepare catalyst by the method for embodiment 1, difference is with 280.0 gram iron oxide red, 140.0 gram iron oxide yellow, 50.0 gram potassium carbonate, 65.0 gram cerium oxalate, 6.6 gram ammonium molybdate, 8.0 gram magnesium oxide, 12.1 gram carbonic acid Strontium, 6.0 grams of niobium oxide, 1.2 grams of manganese oxide, and 19.0 grams of carboxymethylcellulose.

[0040] Carry out activity evaluation and intensity determination by the evaluation condition of embodiment 1 and intensity determination method, test result is listed in Table 1.

Embodiment 3

[0042] Prepare catalyst by the method for embodiment 1, difference is with 240.0 gram iron oxide red, 90.0 gram iron oxide yellow, 58.0 gram salt of wormwood, 60.0 gram cerium carbonate, 7.6 gram ammonium molybdate, 7.0 gram magnesium oxide, 17.6 gram hydrogen Strontium oxide, 6.0 grams of copper oxide, 2.6 grams of hafnium oxide and 16.0 grams of carboxymethyl cellulose.

[0043] Carry out activity evaluation and intensity determination by the evaluation condition of embodiment 1 and intensity determination method, test result is listed in Table 1.

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Abstract

A catalyst for dehydrogenating the alkyl arylhydrocarbon in the condition of low water ratio to obtain alkylenyl arylhydrocarbon is prepared through adding the assistant preventing educing out of carbon and selectivity modifier to the Fe-K-Ce-Mo-Mg system. It has high strength, stability and selectivity.

Description

technical field [0001] The invention relates to a catalyst for dehydrogenating alkylaromatic hydrocarbons with low water ratio, in particular to a catalyst for ethylbenzene dehydrogenation under the condition of low water ratio. Background technique [0002] At present, alkenyl aromatics are mainly produced by catalytic dehydrogenation of alkyl aromatics in industry, and iron-based catalysts with iron oxide as the main active component and potassium oxide as the main co-catalyst are commonly used. The dehydrogenation reaction of alkylaromatics is a typical base-catalyzed reaction, usually adding weakly acidic SiO 2 Ordinary Portland cement, weakly acidic substances are likely to cause carbon deposition on the catalyst. It is generally recognized that potassium alkali is the most effective anti-coking additive, and the reaction speed of charcoal and water vapor increases hundreds of times with the addition of a small amount of weak acid salt of alkali metal. However, potass...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/76B01J23/745C07C5/333
Inventor 宋磊缪长喜邬时海徐永繁甘明华
Owner CHINA PETROLEUM & CHEM CORP