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Catalyst for removing alkadiene in C4 and preparation method thereof

A catalyst and diene technology, which can be used in the purification/separation of hydrocarbons, chemical instruments and methods, catalysts for physical/chemical processes, etc. The effect of strong poisoning ability

Active Publication Date: 2013-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this control method increases the complexity of the process and the difficulty of operation, and has its limitations.

Method used

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  • Catalyst for removing alkadiene in C4 and preparation method thereof

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preparation example Construction

[0017] The preparation method of the catalyst provided by the present invention includes kneading calcium salt and alumina hydrate, molding, drying and roasting to obtain a composite carrier, impregnating the composite carrier with an aqueous solution of tungsten salt or tungstic acid, drying and roasting, and then water-soluble palladium-containing The solution of the compound is impregnated, dried and calcined.

[0018] In the above method, the method of kneading the calcium salt and the hydrated alumina is: adding dilute nitric acid solution to the powder of the calcium salt and the hydrated alumina, the concentration of the nitric acid aqueous solution is 1 to 3% by mass, kneading after stirring, and then extruding , the shaped shape can be strip, column or clover, preferably strip or clover. The shaped solid is dried and calcined to obtain a composite carrier. The drying temperature is preferably 80-130°C, the drying time is preferably 1-16 hours, the calcination tempera...

example 1

[0025] (1) Preparation of composite carrier

[0026] Get 900g pseudo-boehmite powder, 28g concentration is the HNO of 65 mass % 3 Add 900g deionized water, then add 84.5g Ca(NO 3 ) 2 4H 2 O to make a mixed solution, add this mixed solution to pseudo-boehmite powder and knead, extrude, dry at 120°C for 6 hours, and roast at 850°C for 6 hours to obtain a composite carrier, which contains 2.0% by mass of CaO, 98% by mass Aluminum oxide with a specific surface area of ​​124m 2 / g, the pore volume is 0.51ml / g.

[0027] (2) Preparation of catalyst

[0028] Take 36.67g of ammonium metatungstate, add deionized water to adjust the volume to 480ml to prepare an impregnation solution, immerse the composite carrier in the solution for 2 hours, dry at 120°C for 12 hours, and bake at 500°C for 6 hours to obtain a tungsten-containing carrier.

[0029] Take 5.67g PdCl 2 Dissolve the powder with hydrochloric acid, add deionized water to adjust the volume to 480ml, and obtain PdCl 2 sol...

example 2

[0031] Catalyst is prepared by the method for example 1, difference is (1) step used Ca (NO 3 ) 2 4H 2 O is 169g, contains 4.0% by mass of CaO, 96% by mass of alumina in the composite carrier obtained, and its specific surface area is 102m 2 / g, the pore volume is 0.38ml / g. After introducing tungsten and palladium in this composite carrier, obtain catalyst B, its Pd content calculated based on the composite carrier is 0.2 mass %, WO 3 The content is 3.0% by mass.

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Abstract

A catalyst for removing alkadiene in mixed C4. The catalyst comprises a composite carrier and the following active components, calculated by using the composite carrier as a basis: 0.05-1.0 wt% of Pd and 0.1-5.0 wt% of WO3; and the composite carrier comprises 90-99 wt% of alumina and 1-10 wt% of oxygen calcium. The catalyst is used for removing alkadiene in mixed C4 through selective hydrogenation, and has high activity, selectivity and resistance to sulfur poisoning, and excellent service life.

Description

technical field [0001] The present invention relates to a catalyst for selective hydrogenation to remove diolefin impurities and a preparation method thereof, in particular to a catalyst for selective hydrogenation to remove diolefins from a C4 fraction containing monoolefins and its preparation method Preparation. Background technique [0002] In the 21st century, the demand for clean gasoline is increasing. Alkylate oil has become an ideal component of new gasoline because of its low vapor pressure, high octane number, low sensitivity, and no olefins and aromatics. Particularly important. Alkylation raw materials generally use the mixed C4 produced by the steam cracking process after extracting most of the butadiene, or use the mixed C4 produced by the refinery catalytic cracking and the remaining components after the mixed C4 etherification as raw materials . Alkylation raw materials generally contain 0.3% to 1.2% butadiene. In the alkylation reaction, butadiene can p...

Claims

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Application Information

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IPC IPC(8): B01J23/652C07C7/163C07C11/02
Inventor 董明会温朗友俞芳郜亮喻惠利
Owner CHINA PETROLEUM & CHEM CORP
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