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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AI-Extracted 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 ...
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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.

Application Domain

Physical/chemical process catalystsCatalysts +2

Technology Topic

ChemistryEngineering +5

Examples

  • Experimental program(8)
  • Comparison scheme(1)

Example Embodiment

[0038] [Example 1]
[0039]It is weighed 85 gaseous aluminum stone powder and 10 grams of raw cryptochrine mix, add 5 wt% dilute nitric acid solution, thoroughly stir, mix, mix the wet material to a crushing machine with a cylindrical die. Dry, intercept 1 cm small segment, placed in 8 hours in an oven at 80 ° C for 5 hours after 600 ° C, 5 hours, to obtain alumina forming body (specific surface area of ​​300m) 2 / g). The above-described molded body is placed in a stainless steel reaction kettle, and the amount of La added in an equivalent impregnation amount is 0.5% of the nitrate solution, and after 10 hours at 150 ° C, it is taken after 15 hours at 80 ° C, After stirring at 600 ° C for 3 hours, it was immersed with a phosphorus 5 wt% phosphoric acid solution for 2 hours, and then dried for 6 hours at 120 ° C for 5 hours. After 5 hours of 5 hours, the desired tert-butanol dehydrated production of high purity isobutylene catalysts The LA mass content is 0.5%, and the phosphorus mass content is 5%.
[0040] With a fixed bed reactor, the water and the tert-butanol mass ratio of 1: 1 is a raw material, and the reaction pressure is 0.05 MPa, the reaction pressure is 0.05 MPa, and the weight of tert-butanol is 2.0 h. -1 Under the reaction conditions, the results after the reaction 48h were as follows, the tert-butanol conversion was 100%, the isobutylene selectivity was 99.5%; after 1500 hours, the tert-butanol conversion was 100%, isobutylene selectivity 99.3%.

Example Embodiment

[0041] [Example 2]
[0042] It is weighing 99 grams of thin aluminum stone powder and 10 grams of rafting mixture, and 5% dilute nitric acid solution is added, stirred, mix, mix the wet material to the squeezing machine with a three-leaf-shaped die. Dry, intercept 1 cm small segment, placed in an oven at 60 ° C for 10 hours, 10 hours in a muffle furnace at 400 ° C, resulting in alumina forming profile (350m specific surface area) 2 / g). The above-described molded body is placed in a stainless steel reaction kettle, and the amount of Ce weight is 5% by the equivalent impregnation amount of 5%, and then taken out at 180 ° C for 10 hours, after 120 ° C for 6 hours, 450 After calcination at ° C for 5 hours, it was immersed in a volume of phosphoric phosphoric phosphoric acid solution for 2 hours, and then dried for 10 hours at 80 ° C, after 3 hours of 600 ° C, the desired tert-butanol dehydrated production of high purity isobutylene catalysts. The Ce mass content was 5%, and the phosphorus mass content was 1%.
[0043] With a fixed bed reactor, the water and the tert-butanol moiety of 0.2: 1 are raw materials, and the reaction pressure is 0.02 MPa, the reaction pressure is 0.02 MPa, the tert-butanol weight is 8.0 h. -1 Under the reaction conditions, the results were taken as follows, and the t-butanol conversion was 99.5%, the isobutylene selectivity was 99.9%.

Example Embodiment

[0044] [Example 3]
[0045] It is weighed 85 gaseous aluminum stone powder and 10 grams of raw cryptochrine mix, add 5 wt% dilute nitric acid solution, thoroughly stir, mix, mix the wet material to a crushing machine with a cylindrical die. Dry, cut into 1 cm small segment, placed in an oven at 80 ° C for 5 hours in a muffle furnace at 600 ° C, resulting in alumina forming body (300m specific surface area) 2 / g). The above-described molded body is placed in a stainless steel reaction kettle, and the amount of La weight is 0.5% by the equivalent impregnation amount of 0.5%. After 10 hours at 150 ° C, it is taken out, dried at 80 ° C for 15 hours, 600 After 3 hours of calcination at ° C, the desired t-butyl alcohol dehydrated catalyst was obtained, and the LA mass content was 0.5%.
[0046] With a fixed bed reactor, water and tert-butanol mass ratio of 1: 1 tert-butan alcohol aqueous solution are raw materials, at a reaction temperature of 400 ° C, reaction pressure 0.05 MPa, tert-butanol weight drop 2.0H -1 Under the reaction conditions, the results were 98.6% by the t-butanol conversion of 98.6%, and the isobutylene selectivity was 97.5%; after 500 hours, the tert-butanol conversion was 95.3%, isobutylene selectivity 92.1%.

PUM

PropertyMeasurementUnit
Specific surface area350.0m²/g
Specific surface area320.0m²/g
Specific surface area340.0m²/g

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

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