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Light hydrocarbon distillate selective dediene catalyst and method for preparing the same

A technology of catalyst and fraction, applied in the field of hydrogenation catalyst and its preparation, can solve the problems of deactivation, metal Pd poisoning, catalyst selectivity and stability decline, etc.

Inactive Publication Date: 2005-10-26
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 catalyst selectivity and stability
In addition, compounds such as sulfur and nitrogen in the reactants can easily cause metal Pd poisoning and inactivation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0009] The preparation method of the magnesium-aluminum oxide solid solution is: the mixed solution of the metal salt of soluble magnesium and aluminum and the mixed lye used as the precipitating agent are prepared by co-current co-precipitation to form a layered columnar double hydroxide precursor with a hydrotalcite structure, After high-temperature roasting and decomposition, Mg(Al)O is obtained. Described magnesium salt is selected from MgCl 2 , Mg(NO 3 ) 2 or MgSO 4 , preferably Mg(NO 3 ) 2 , the aluminum salt is selected from Al(NO 3 ) 3 、Al 2 (SO 4 ) 3 or AlCl 3 , preferably Al(NO 3 ) 3 . The precipitating agent is selected from Na 2 CO 3 / NaOH, K 2 CO 3 / KOH or (NH 4 ) 2 CO 3 / NH 4 Mixed solution of OH, preferably (NH 4 ) 2 CO 3 / NH 4 OH mixed solution. Suitable cation concentration (Mg 2+ +Al 3+ ) is 1.0 ~ 2.0M, Mg / Al molar ratio is 1.0 ~ 12.0, preferably 3.0 ~ 7.0; the amount of alkali required should make OH - and cation concentration (M...

example 1

[0022] This example starts with (NH 4 ) 2 CO 3 / NH 4 OH mixed solution is used as precipitant, and magnesium-aluminum oxide solid solution is prepared by co-current co-precipitation method.

[0023] 256 g Mg(NO 3 ) 2 ·6H 2 O and 125 g Al(NO 3 ) 3 9H 2 O mixed, adding deionized water to a total solution volume of 700 milliliters; another 80 grams (NH 4 ) 2 CO 3 Dissolve in 330 g concentrated NH 4 OH aqueous solution, and then added deionized water to a total volume of 700 ml. Add 400 milliliters of deionized water into a 3-liter three-neck flask, heat to 60 ° C, and mix the prepared magnesium nitrate and aluminum nitrate solution with (NH 4 ) 2 CO 3 The mixed solution of ammonia and water was dripped into the bottle in a parallel flow, and the dripping speed of the two mixed solutions was controlled. The dripping was completed within 90 to 120 minutes, and the stirring and aging was continued for 1.0 hour, then filtered and washed until neutral, and the filter ca...

example 2

[0025] In this example, the catalyst is prepared by stepwise saturated impregnation method.

[0026] 0.10 g PdCl 2 Place in a 100ml beaker, add a few drops of concentrated HCl to make PdCl 2 Acidify and dissolve into a transparent liquid, then move the beaker to an 80°C water bath to evaporate excess HCl, then add 12 grams of deionized water to make PdCl 2 Aqueous solution; Get the Mg(Al)O that 20 grams example 1 prepares, pour into above-mentioned PdCl 2 Stir rapidly in the solution, impregnate at room temperature for 2 hours, dry at 110° C. for 4 hours, and bake at 500° C. for 4 hours to prepare palladium-containing catalyst E. Its composition and physical and chemical properties are shown in Table 1, and the thickness of the Pd layer was measured by a reading microscope.

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Abstract

A catalyst for selectively hydrogenating and dediolefinating for light hydrocarbon fractions, comprises 0.05-1.0 wgt% Pd as the active component and the carrier of magnesium aluminum oxide solid solution. In the magnesium aluminum oxide, the mol ration of Mg / Al is 1.0-12.0. the catalyst also contains auxiliary agents selecting from Co, Mo, Ni and Wu. The catalyst is suitable for selectively hydrogenating and dediolefinating for light C4-C6 hydrocarbon fractions.

Description

technical field [0001] The invention relates to a hydrogenation catalyst for selectively removing diolefin impurities from light hydrocarbon fractions containing monoolefins and a preparation method thereof, in particular, a hydrogenation catalyst suitable for the alkylation of light hydrocarbons or the etherification of light gasoline A selective hydrogenation catalyst for de-diene treatment of raw materials and a preparation method thereof. Background technique [0002] With the increasingly stringent environmental protection requirements, gasoline in the fuel standards of various countries is developing towards clean fuels with unleaded, low olefins, low aromatics, and low sulfur content. The highest gasoline standard (Type III) proposed in the 1998 "World Fuel Specifications" requires: olefin content ≯10m / m%, benzene content ≯1.0m / m%, aromatic content ≯35m / m%. In order to meet this requirement, gasoline blending components must take the road of diversification. When FC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G45/34
Inventor 王辉国于永军姚志龙郁灼
Owner CHINA PETROLEUM & CHEM CORP
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