Catalyst for isomerizing low-carbon paraffin and its preparing process

A technology of alkane isomerization and catalyst, which is applied in the field of solid superacid catalyst and preparation, can solve the problem of unsatisfactory isomerization selectivity, achieve large specific surface area, improve the selectivity of isoparaffins, and reduce the effect of cracking activity

Inactive Publication Date: 2004-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst introduces alumina through the kneading method and stabilizes the tetragonal zirconia, when it is use...

Method used

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  • Catalyst for isomerizing low-carbon paraffin and its preparing process
  • Catalyst for isomerizing low-carbon paraffin and its preparing process
  • Catalyst for isomerizing low-carbon paraffin and its preparing process

Examples

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preparation example Construction

[0013] The preparation method of catalyst provided by the invention comprises the steps:

[0014] (1) make IIA group metal or rare earth element modified zirconium hydroxide with co-precipitation or impregnation method,

[0015] (2) Mix the modified zirconium hydroxide and aluminum hydroxide in a ratio of 10 to 90: 10 to 90 on a dry basis, and impregnate them with an aqueous solution of sulfuric acid or ammonium sulfate with a concentration of 0.1 to 2.0 mol / liter, After drying, extrusion molding, 400 ~ 800 ℃ roasting,

[0016] (3) impregnating the solid after step (2) roasting with a compound containing Group VIII metal, then drying, and roasting at 450-650°C.

[0017] The method for preparing modified zirconium hydroxide by impregnation in step (1) of the above preparation method is to impregnate zirconium hydroxide with a soluble compound solution of group IIA metal or rare earth element, and then dry. The liquid / solid ratio during impregnation is 0.5-2.0 ml / g.

[0018] ...

example 1

[0039] Preparation of the catalyst of the present invention.

[0040] (1) Preparation of modified zirconium hydroxide.

[0041]Zirconium oxychloride (ZrOCl 2 ·8H 2 O) be made into 25 mass % aqueous solution, dropwise add 25 mass % concentrated ammonia water to the solution pH value is 8.5, zirconium hydroxide precipitation is washed and filtered until the filtrate is neutral and can not detect Cl -1 , dry at 110°C for 24 hours, take 80 grams (dry basis mass) of zirconium hydroxide and grind it into powder, and use 80 milliliters of Mg(NO) with a magnesium content of 2.5 mg / ml 3 ) 2 Dipping and drying at 110°C for 12 hours to obtain magnesium-modified zirconium hydroxide.

[0042] (2) Preparation of catalyst

[0043] Mix the above-mentioned magnesium-modified zirconium hydroxide with 20 grams (dry weight) of aluminum hydroxide (SB powder produced by Condea, Germany), add 120 milliliters of 1 mol / liter sulfuric acid, soak at room temperature for 1 hour, and remove the upper...

example 2

[0045] Catalyst B-750 was prepared according to the method of Example 1, except that the calcining temperature after extrusion molding was 750° C., and its composition and physical and chemical properties are shown in Table 1.

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Abstract

The solid acid catalyst for isomerizing C4-C7 alkane includes sulfate radical and VIII metal carried on carrier, and the carrier consists of zirconia, alumina and one kind of modifying element selected from RE element or IIA metal. The catalyst contains zirconia in tetragonal crystal system, S 0.5-5.0 wt%, VIII metal 0.1-5.0 wt% and modifying element 0.1-10.0 wt%, and has zirconia/alumina mass ratio of 10-90 to 10-90. The catalyst is used in isomerizing lower alkane and has high activity stability and isomerizing selectivity.

Description

technical field [0001] The invention relates to a solid superacid catalyst and a preparation method thereof, in particular to a catalyst containing zirconia and sulfate radicals for isomerization of normal alkanes and a preparation method thereof. Background technique [0002] Acid catalysts play an important role in the petrochemical industry. Commonly used acid catalysts include liquid acid catalysts, such as H 2 SO 4 , HF, and halogen-containing solid acid catalysts. These two types of catalysts have problems such as polluting the environment and corroding equipment. Halogen-containing solid acid catalysts are very easy to lose halogen, so the water in the raw material is strictly controlled, and the halogen needs to be replenished frequently. SO 4 2- / ZrO 2 The solid superacid catalyst has the advantages of high activity, high selectivity, good thermal stability, easy phase separation from the reaction product, environmental friendliness, no corrosion of equipment,...

Claims

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Application Information

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IPC IPC(8): B01J27/053C07C5/22
Inventor 潘晖华于中伟濮仲英
Owner CHINA PETROLEUM & CHEM CORP
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