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Selective hydrogenation catalyst for removing alkadiene in mixed c4 and preparation method thereof

A technology of mixed carbon and catalyst, which is applied in the field of catalyst for selective hydrogenation and removal of diolefins in mixed carbon four fractions and its preparation field. It can solve the problems of catalyst activity and selectivity decline, and it is not easy to reach the temperature and has good stability. , the effect of simple preparation method

Inactive Publication Date: 2010-10-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acid centers on the surface of alumina or silica can easily trigger the oligomerization of unsaturated hydrocarbons to form "green oil", resulting in a decrease in the activity and selectivity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of the catalyst of the present invention includes impregnating the carrier of the present invention with a solution containing a water-soluble palladium compound, drying and calcining, then impregnating with a water-soluble lead compound solution, then drying and calcining.

[0020] In the above method, the preparation method of the carrier is: impregnating γ-alumina with magnesium salt solution, the impregnation temperature is preferably 20-45°C, the liquid / solid ratio during impregnation is 0.6-1.2ml / g, and the solid obtained after impregnation is dried Afterwards, the carrier is obtained by roasting at 900-1100°C. The drying temperature is 60-150°C, preferably 80-120°C, the drying time is 2-16 hours, preferably 4-12 hours, and the calcination time is 2-20 hours, preferably 2-10 hours.

[0021] The magnesium salt is magnesium chloride, magnesium nitrate or magnesium sulfate, preferably magnesium nitrate. The concentration of the magnesium salt ...

example 1

[0029] Catalysts described in the present invention are prepared.

[0030] (1) Preparation of carrier

[0031] The specific surface area of ​​1kg is 316m 2 γ-alumina pellets (produced by Shandong Baichuan Huitong Chemical Technology Co., Ltd.) with a pore volume of 0.65ml / g, with 800ml concentration of 10 mass% Mg(NO 3 ) 2 The solution was impregnated at 25°C for 20 minutes, and the impregnated solid was dried at 120°C for 4 hours, and then calcined at 950°C for 8 hours to obtain a specific surface area of ​​118m 2 / g, pore volume of 0.45ml / g carrier, where MgAl 2 o 4 The content is 5.7% by mass.

[0032] (2) Preparation of catalyst

[0033] Take 5.67g of PdCl 2Dissolve it in HCl with a concentration of 37% by mass and add it to deionized water to obtain PdCl with a concentration of 0.012% by mass 2 Solution 480ml. Put the carrier obtained in step (1) into PdCl 2 Immerse in the solution at 25°C for 2 hours, dry the solid at 80°C for 12 hours after impregnation, and b...

example 2

[0036] Prepare catalyst by the method for example 1, difference is (1) step uses Mg(NO 3 ) 2 After the γ-alumina pellets are impregnated with the solution, they are dried and calcined at 1100°C for 10 hours to obtain a specific surface area of ​​80m 2 / g, pore volume of 0.31ml / g carrier, where MgAl 2 o 4 The content of 5.7% by mass. Then prepare the catalyst according to the method of Example 1 (2), wherein the Pd content calculated on the basis of the carrier is 0.2 mass%, and the Pb content is 0.05 mass%.

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Abstract

The invention relates to a selective hydrogenation catalyst for removing alkadiene in mixed C4, which consists of carrier and the following active components measured with the carrier as a reference: 0.1 to 2.0 percent by weight of Pd and 0.1 to 1.0 percent by weight of Pb; the carrier is alumina, the surface layer of which is covered by magnesia-alumina spinel, and the carrier contains 5 to 15 percent by weight of the magnesia-alumina spinel. The catalyst is used for the selective hydrogenation of alkadiene, and has the advantages of high activity and selectivity, high sulphur resistance and long service life.

Description

technical field [0001] The invention relates to a catalyst for selectively hydrogenating and removing diolefin impurities from monoolefins and a preparation method thereof, specifically, a catalyst for selectively hydrogenating and removing diolefins from mixed carbon four fractions Catalyst and method for its preparation. Background technique [0002] At present, the demand for clean gasoline is increasing day by day. Alkylate oil has become an ideal component of new formulation gasoline because of its low vapor pressure, high octane number, low sensitivity, and no olefins and aromatics. Alkylation raw materials generally use the mixed C4 produced by the steam cracking process to extract most of the butadiene components, or use the mixed C4 produced by the refinery catalytic cracking and the remaining components after the mixed C4 etherification. The alkylation raw material generally contains 0.3 to 1.2% by mass of butadiene. In the alkylation reaction, butadiene can gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62C10G45/40C07C7/163
Inventor 董明会温朗友郜亮俞芳时昭喻惠利
Owner CHINA PETROLEUM & CHEM CORP
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