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Dehydration catalyst and preparation method thereof and application of dehydration catalyst in production of isobutene by dehydration of tert-butyl alcohol

A dehydration catalyst and catalyst technology, applied in the direction of catalysts, carbon compound catalysts, physical/chemical process catalysts, etc., can solve the problems of less types of downstream products, low effective utilization rate, and excess capacity of tert-butanol, etc., and achieve good technical results Effect

Pending Publication Date: 2022-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the existing problems of overcapacity of tert-butanol, few types of downstream products, and low effective utilization rate, the present invention provides a dehydration catalyst, a preparation method and its application in the dehydration of tert-butanol to produce isobutene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Take by weighing 85 grams of pseudo-boehmite powder and 10 grams of astragalus powder and mix, add 5wt% dilute nitric acid solution, fully stir, mix, wet material is sent to extrude molding in the extruder with cylindrical die head, Dry it in the air, cut it into 1cm segments, place it in an oven at 80°C for 8 hours, and bake it in a muffle furnace at 600°C for 5 hours before use to obtain an alumina molded body (with a specific surface area of ​​300m 2 / g). Take the above molded body and put it in a stainless steel reaction kettle, add a lanthanum nitrate solution with a La weight percentage of 0.5% according to an equal volume of impregnation, take it out after a hydrothermal reaction at 150°C for 10 hours, and dry it at 80°C for 15 hours. After roasting at 600°C for 3 hours, impregnate with equal volume of phosphoric acid solution containing 5wt% phosphorus for 2 hours, then dry at 120°C for 6 hours, and roast at 450°C for 5 hours to obtain the desired catalyst for de...

Embodiment 2

[0042] Take by weighing 99 grams of pseudo-boehmite powder and 10 grams of astragalus powder and mix, add 5% dilute nitric acid solution, fully stir and mix, and send the wet material to an extruder with a clover-shaped die for extrusion molding. Dry it in the air, cut it into 1cm segments, put it in an oven at 60°C for 20 hours, and bake it in a muffle furnace at 400°C for 10 hours to obtain an alumina molded body (with a specific surface area of ​​350m 2 / g). Take the above molded body and put it in a stainless steel reaction kettle, add a cerium nitrate solution with a Ce weight percentage of 5% according to the equal volume of impregnation, take it out after a hydrothermal reaction at 180°C for 10 hours, and dry it at 120°C for 6 hours, 450 After roasting at ℃ for 5 hours, impregnate with equal volume of phosphoric acid solution containing phosphorus wt 1% for 2 hours, then dry at 80°C for 10 hours, and roast at 600°C for 3 hours to obtain the catalyst for the dehydration ...

Embodiment 3

[0045] Take by weighing 85 grams of pseudo-boehmite powder and 10 grams of astragalus powder and mix, add 5wt% dilute nitric acid solution, fully stir, mix, wet material is sent to extrude molding in the extruder with cylindrical die head, Dry it in the air, cut it into 1cm segments, place it in an oven at 80°C for 8 hours, and bake it in a muffle furnace at 600°C for 5 hours to obtain an alumina molded body (with a specific surface area of ​​300m 2 / g). Take the above molded body and place it in a stainless steel reaction kettle, add a lanthanum nitrate solution with a La weight percentage of 0.5% according to the equal volume of impregnation, take it out after a hydrothermal reaction at 150°C for 10 hours, and dry it at 80°C for 15 hours, 600 After roasting at ℃ for 3 hours, the desired catalyst for producing high-purity isobutene by dehydration of tert-butanol was obtained, and the mass content of La was 0.5%.

[0046] A fixed-bed reactor is used, the tert-butanol aqueous ...

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Abstract

The invention discloses a dehydration catalyst and a preparation method thereof, and application of the dehydration catalyst in production of high-purity isobutene by dehydration of tert-butyl alcohol. The catalyst is prepared from the following components in percentage by mass: a) 85.0 to 99.5 percent of aluminum oxide, b) 0.5 to 10.0 percent of a rare earth element and c) 0 to 5.0 percent of a phosphorus element. When the catalyst disclosed by the invention is used for producing the isobutene by dehydrating the tert-butyl alcohol, a simple process flow is adopted, the tert-butyl alcohol can be converted into the high-purity isobutene with a high added value by high dehydration, and the catalyst has the characteristics of high catalyst stability, high tert-butyl alcohol conversion rate and high isobutene selectivity.

Description

technical field [0001] The invention relates to a dehydration catalyst and a preparation method thereof, as well as the application of the catalyst in the dehydration of tert-butanol to produce high-purity isobutene. Background technique [0002] Tert-butyl alcohol (TBA, tert-butyl alcohol) is a colorless crystal, a colorless volatile liquid in the presence of a small amount of water, has a smell similar to camphor, is hygroscopic, flammable, and has a higher alcohol content than other alcohols. toxicity and narcotic properties. Tert-butanol is soluble in most organic solvents, such as alcohols, esters, ketones, aromatic and aliphatic hydrocarbons, these properties make tert-butanol a useful solvent and additive, and it is one of the petrochemical products with a wide range of uses . Among them, the most widely used is as a gasoline additive to increase the octane number of gasoline. Tert-butanol can be added alone, or mixed with other alcohol solvents, and can also be add...

Claims

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Application Information

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IPC IPC(8): B01J27/18C07C1/24C07C11/09
CPCB01J27/14B01J27/1804C07C1/24C07C2527/18C07C11/09
Inventor 徐建军任丽萍李斌滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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