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Chroma alumina catalysts for alkane dehydrogenation

A technology of dehydrogenation catalyst and alumina, applied in carbon compound catalysts, catalysts, catalysts for physical/chemical processes, etc., can solve the problems such as very difficult control of temperature distribution of catalytic bed, difficult control of coke distribution, influence of heat, etc.

Inactive Publication Date: 2014-08-27
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, the distribution of coke within the catalytic bed is not easily controllable, which affects the amount of heat applied at each location and creates a catalytic bed temperature distribution
These factors make it very difficult to control the temperature distribution in the catalytic bed

Method used

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  • Chroma alumina catalysts for alkane dehydrogenation
  • Chroma alumina catalysts for alkane dehydrogenation
  • Chroma alumina catalysts for alkane dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0056] Embodiment 2 (with 0.4% SiO 2 Na-silicate impregnation)

[0057] Alumina trihydrate (2700.4 grams) was charged to 10L in the mixer. 24.5g Sodium silica (PQ; 28.7% SiO 2 ) in 80 ml of water was added to the mixer. After the mixer was running for 2 minutes, a solution comprising water (200 grams) and nitric acid (198.0 grams) was added to the mixer. The mixture was mixed for a total of about 20 minutes. The mixture was formed into cylindrical extrudates (1 / 8" diameter), dried overnight at 90 degrees Celsius, and then calcined in air at 800 degrees Celsius for 2 hours. The calcined extrudates were made without external Cool in a cooled furnace.

[0058] A portion (250 g) of the calcined alumina extrudate was impregnated with an aqueous solution of chromic acid (88 g), a sodium dichromate solution (7.7 g, 69% sodium dichromate dihydrate) and water (52 g) To first wet. The samples were dried and calcined in air at 750 degrees Celsius for 2 hours. The impregna...

Embodiment 3

[0059] Embodiment 3 (utilize 1.6%SiO 2 Na-silicate impregnation)

[0060] Alumina trihydrate (2700.4 grams) was charged to 10L in the mixer. 98.3g Sodium silica (PQ; 28.7% SiO 2 ) solution was added to the mixer. After the mixer was running for 2 minutes, a solution comprising water (200 grams) and nitric acid (198.0 grams) was added to the mixer. The mixture was mixed for a total of about 20 minutes. The mixture was formed into cylindrical extrudates (1 / 8" diameter), dried overnight at 90 degrees Celsius, and then calcined in air at 800 degrees Celsius for 2 hours. The calcined extrudates were made without external Cool in a cooled furnace.

[0061] A portion (250 g) of the calcined alumina extrudate was impregnated with an aqueous solution of chromic acid (87.7 g), sodium dichromate solution (3 g, 69% sodium dichromate dihydrate) and water (49 g) To first wet. The samples were dried and calcined in air at 750 degrees Celsius for 2 hours. The impregnated extru...

Embodiment 4

[0062] Embodiment 4 (with colloidal silicon dioxide 0.5% SiO 2 co-extrusion)

[0063] Alumina trihydrate (2700.4 grams) was charged to 10L in the mixer. 33.75 grams of colloidal silicon dioxide ( 2327) in 50 ml of water was added to the mixer. After the mixer was running for 2 minutes, a solution comprising water (290 grams) and nitric acid (132.0 grams) was added to the mixer. The mixture was mixed for a total of about 20 minutes. The mixture was formed into cylindrical extrudates (1 / 8" diameter), dried overnight at 90 degrees Celsius, and then calcined in air at 800 degrees Celsius for 2 hours. The calcined extrudates were made without external Cool in a cooled furnace.

[0064] A portion (250 g) of the calcined alumina extrudate was impregnated with an aqueous solution of chromic acid (82.4 g), a sodium dichromate solution (12.4 g, 69% sodium dichromate dihydrate) and water (58.8 g) To first wet. The samples were dried and calcined in air at 750 degrees Cels...

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Abstract

Provided are methods of making dehydrogenation catalyst supports containing bayerite and silica. Silica-stabilized alumina powder, prepared by spray drying of bayerite powder, precipitating silica in a bayerite slurry with an acid, or impregnation or co-extrusion of bayerite with sodium silicate solution was found to be a superior catalyst support precursor. Catalysts prepared with these silica containing support materials have higher hydrothermal stability than current CATOFIN TM catalysts. Also provided is a dehydrogenation catalyst comprising Cr2O3, an alkali metal oxide, SiO2 and Al2O3, and methods of using said catalyst to make an olefin and / or dehydrogenate a dehydrogenatable hydrocarbon.

Description

technical field [0001] In general terms, the present invention relates to the field of catalysts. In particular, the invention relates to catalysts comprising bayerite and silica for the dehydrogenation of alkanes. Background technique [0002] The process converts aliphatic hydrocarbons to their corresponding olefins over a fixed bed chromia alumina catalyst. For example, it can be used to prepare isobutene, propene or pentene from isobutane, propane or isopentane, respectively. The process is an adiabatic, cyclic process. Each cycle includes several steps including catalyst reduction, dehydrogenation, removal of residual hydrocarbons from the reactor, and regeneration by air. The cycle is then started again by a reduction step. [0003] The dehydrogenation reaction is highly endothermic. Therefore, the temperature of the catalytic bed will decrease during the dehydrogenation step. This reduction in temperature results in a reduction in paraffin conversion. In orde...

Claims

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Application Information

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IPC IPC(8): B01J21/08B01J37/03B01J6/00
CPCB01J21/08B01J21/12B01J37/0201B01J35/1014B01J23/002C07C2521/04B01J23/26B01J35/023B01J37/03B01J37/0009C07C2523/26C07C5/3332B01J6/00B01J37/0045C07C2521/08B01J35/026B01J2523/00B01J37/031Y02P20/52B01J35/50B01J35/40B01J35/613B01J2523/12B01J2523/31B01J2523/41B01J2523/67C07C11/06
Inventor S·Y·崔
Owner BASF AG
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