Alcohol dehydration catalyst, preparation method the same and method for preparing alpha-olefins using the same

Patent metadata

Field	Value
Publication number	US-11192090-B2
Application number	US-202016791392-A
Country	US
Kind code	B2
Filing date	Feb 14, 2020
Priority date	Mar 25, 2019
Publication date	Dec 7, 2021
Grant date	Dec 7, 2021

Abstract

The present invention relates to a catalyst for dehydration of a primary alcohol, a method of preparing the same, and a method of producing an alpha-olefin using the same. The catalyst for dehydration of a primary alcohol according to the present invention has an excellent catalyst stability while having an excellent activity with respect to dehydration, and a high turnover frequency, such that a linear alpha-olefin with high purity may be produced with a high selectivity even in a case where a relatively small amount of a cocatalyst is added as compared with a homogeneous catalyst system.

First claim

What is claimed is:

1. A method of converting a primary alcohol into an olefin, the method comprising:
converting the primary alcohol into the olefin by contacting the primary alcohol with a catalyst for dehydration of the primary alcohol, the catalyst comprising a carrier of magnesium aluminate, hydrotalcite, or a combination thereof, and Group VI transition metal particles supported on the carder.

2. The method of claim 1 , wherein the Group VI transition metal particles are formed of tungsten.

3. The method of claim 1 , wherein the Group VI transition metal particles are supported in an amount of 10 wt % or less with respect to a total weight of the carrier.

4. The method of claim 1 , wherein the primary alcohol is 1-octanol.

5. The of method claim 1 , further comprising preparing the catalyst for dehydration of the primary alcohol by the following steps:
impregnating the carrier with a precursor solution of the Group VI transition metal particles; and
calcining the impregnated carrier.

6. The method of claim 5 , wherein the Group VI transition metal precursor of the metal precursor solution is an ammonium-based compound.

7. The method of claim 5 , wherein the Group VI transition metal precursor is ammonium paratungstate, ammonium metatungstate, or a combination thereof.

8. A method of producing a linear alpha-olefin, the method comprising:
converting a primary alcohol into a converted product comprising the linear alpha-olefin by contacting the primary alcohol with a catalyst for dehydration of the primary alcohol, the catalyst comprising magnesium aluminate, hydrotalcite, or a combination thereof as a carrier, and Group VI transition metal particles supported on the carrier;
fractionating the converted product; and
recovering the linear alpha-olefin.

9. The method of claim 8 , wherein the converting is performed at 200 to 800° C.

10. The method of claim 8 , wherein, in the converting, the primary alcohol is fed at a liquid hourly space velocity of 3 to 100 h −1 .

11. The method of claim 8 , wherein the fractionating is performed by distillation, extraction, adsorption, or ion exchange.

12. The method of claim 8 , wherein a conversion ratio of the primary alcohol is 50% or more, and a selectivity for the linear alpha-olefin is 60% or more.

Assignees

• Korea Inst Energy Res

Inventors

• Koo Kee Young
• Jung Un-Ho
• Kim Young-Eun
• Im Hyo Been
• Chun Dong Hyun
• Youn Min Hye
• Jeong Heon-Do
• Park Ji-Chan
• Rhim Geun Bae
• Lee Dong-Wook

Classifications

• B01J21/10

  Magnesium; Oxides or hydroxides thereof · CPC title

• C07C2521/10

  Magnesium; Oxides or hydroxides thereof · CPC title

• C07C1/24

  by elimination of water · CPC title

• C07C2521/02

  Boron or aluminium; Oxides or hydroxides thereof · CPC title

• B01J27/236

  Hydroxy carbonates · CPC title