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Preparation and Application of Alumina Catalyst for Dehydration of Isobutanol

A technology of dehydration reaction and isobutanol, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, and hydrocarbon production from oxygen-containing organic compounds, etc. The problems of high-grade isobutene and other issues can be achieved to achieve energy-saving production, reduce olefin interconversion reactions, and reduce production costs.

Active Publication Date: 2019-06-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Under the action of the existing alumina catalyst, the production of isobutene by the dehydration reaction of isobutanol cannot reach the index of chemical grade isobutene, and can only be used as the raw material of MTBE synthesis device. It needs to go through the process of MTBE synthesis-cracking to obtain chemical grade isobutene Isobutene, higher production cost

Method used

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  • Preparation and Application of Alumina Catalyst for Dehydration of Isobutanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Weigh 37.51g (0.1mol) of aluminum nitrate and dissolve it in 500ml of hot water at 55°C, add dropwise 0.6mol / L ammonia solution to pH = 8.5, continue stirring for 2 hours, and then hydrothermally age at 80°C for 24 hours. After aging, the resulting gel was cooled to room temperature for use.

[0044] Weigh 0.6g of amorphous silica-alumina powder and add appropriate amount of the above gel (amorphous silica-alumina weight:pseudoboehmite gel weight=6:100), stir at room temperature for 1 hour, filter and dry with 5% The diluted nitric acid is mixed and extruded into a cylindrical shape, and the diameter of the cylinder is 2mm. After molding, it is dried at 100°C for 3 hours and calcined at 500°C for 4 hours to prepare a carrier.

[0045] Prepare 20ml of 12% (2mol / L) KOH solution to impregnate the above carrier for 1 hour, then prepare 8% (0.5mol / L) Ca(NO 3 ) 2 20ml of the solution was impregnated with the carrier for 2 hours, dried at 120°C for 3 hours, and calcined at ...

Embodiment 2

[0048] Weigh 37.51g (0.1mol) of aluminum nitrate and dissolve it in 500ml of hot water at 55°C, add dropwise 0.6mol / L ammonia solution to pH = 8.5, continue stirring for 2 hours, and then hydrothermally age at 80°C for 24 hours. After aging, the resulting gel was cooled to room temperature for use.

[0049] Weigh 0.4g of amorphous silica-alumina powder and add it into an appropriate amount of the above-mentioned gel (weight of amorphous silica-alumina: weight of pseudo-boehmite gel=4:100), stir at room temperature for 1 hour, filter and dry with 5 % dilute nitric acid is mixed and extruded into a cylindrical shape, and the diameter of the cylinder is 2mm. After molding, it is dried at 100°C for 3 hours and calcined at 500°C for 4 hours to prepare a carrier.

[0050] Prepare 20ml of 12% (2mol / L) KOH solution to impregnate the above carrier for 1 hour, then prepare 8% (0.5mol / L) Ca(NO 3 ) 2 20ml of the solution was impregnated with the carrier for 2 hours, dried at 120°C for ...

Embodiment 3

[0053] Weigh 37.51g (0.1mol) of aluminum nitrate and dissolve it in 500ml of hot water at 55°C, add dropwise 0.6mol / L ammonia solution to pH = 8.5, continue stirring for 2 hours, and then hydrothermally age at 80°C for 24 hours. After aging, the resulting gel was cooled to room temperature for use.

[0054] Weigh 0.6g of amorphous silica-alumina powder and add it into an appropriate amount of the above-mentioned gel (amorphous silica-alumina weight: pseudo-boehmite gel weight = 6:100), stir at room temperature for 1 hour, filter and dry with 5 % dilute nitric acid is mixed and extruded into a cylindrical shape, and the diameter of the cylinder is 2mm. After molding, it is dried at 100°C for 3 hours and calcined at 500°C for 4 hours to prepare a carrier.

[0055] Prepare 20ml of 16% (2.8mol / L) KOH solution to impregnate the above carrier for 1 hour, then prepare 10% (0.6mol / L) Ca(NO 3 ) 2 20ml of the solution was impregnated with the carrier for 2 hours, dried at 120°C for 3...

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Abstract

The invention relates to a preparation method of a modified alumina catalyst for the dehydration reactions of isobutanol. The preparation method comprises the following steps: (a) mixing an aluminum salt solution and an alkali solution; (b) subjecting the mixture obtained in the step (a) to an aging treatment to obtain pseudo-boehmite gel; (c) mixing the pseudo-boehmite gel obtained in the step (b) with amorphous silica-alumina, drying the mixture, and carrying out extrusion moulding to obtain a carrier; and (d) dipping the carrier obtained in the step (c) in a caustic alkali solution and a calcium salt solution, and performing drying and burning to obtain the modified alumina catalyst. The prepared catalyst is applied to dehydration reactions of isobutanol to prepare isobutene; and the conversion rate of isobutanol and selectivity of isobutene are both improved.

Description

technical field [0001] The invention relates to a preparation method of an alumina catalyst, in particular to a preparation method of an alumina catalyst used for the dehydration reaction of isobutanol. The invention also relates to a method for preparing isobutene by dehydrating isobutanol. Background technique [0002] Isobutylene is an important fine chemical raw material and an important monomer for synthetic rubber and resin. MTBE (methyl tert-butyl ether) cracking is currently the most important method for producing isobutene, which has the advantages of abundant raw material sources, low requirements for equipment and materials, and low environmental pollution. [0003] However, the rising price of crude oil has prompted the search for alternative petrochemical production methods, with the dehydration of isobutanol gaining increasing attention. In addition to traditional methods such as oxo synthesis, isobutanol can also be produced from coal chemical routes, that i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/04B01J35/10C07C11/09C07C1/24
Inventor 贾志光杨怀军庄书红赵岚李正艳
Owner CHINA PETROLEUM & CHEM CORP
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