Solid catalyst for dehydration of mannitol, and method for producing 2, 5-sorbitan and/or isomannide using this catalyst

Patent metadata

Field	Value
Publication number	US-10479799-B2
Application number	US-201716322351-A
Country	US
Kind code	B2
Filing date	Jul 20, 2017
Priority date	Aug 29, 2016
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

Provided is a solid acid catalyst which enables the production of isomannide and/or 2,5-sorbitan from mannitol with high yield and high safety at low cost. The mannitol may be derived from a cellulose and/or a hemicellulose. The solid acid catalyst for dehydration contains an acid type β-zeolite and/or a Y type zeolite.

First claim

The invention claimed is:

1. A solid, dehydration catalyst for producing 2,5-sorbitan and/or isomannide from mannitol comprising an H-type β zeolite and/or a Y-type zeolite.

2. The solid, dehydration catalyst according to claim 1 consisting essentially of the H-type β-zeolite.

3. The solid, dehydration catalyst according to claim 1 consisting essentially of the Y-type zeolite.

4. The solid, dehydration catalyst according to claim 1 , wherein the H-type β-zeolite and/or Y-type zeolite has a Si/Al atomic composition ratio of 10 to 300.

5. The solid, dehydration catalyst according to claim 4 , wherein the Si/Al atomic composition ratio of the H-type β-zeolite and/or Y-type zeolite is 25 to 150.

6. The solid, dehydration catalyst according to claim 5 , wherein the Si/Al atomic composition ratio of the H-type β-zeolite and/or Y-type zeolite is 40 to 100.

7. A process for producing 2,5-sorbitan and/or isomannide from mannitol, comprising the steps of:
(a) adding the solid, dehydration catalyst according to claim 1 to mannitol to obtain a reaction mixture, and
(b) heating the reaction mixture obtained in step (a) to a temperature of 110° C. to 170° C. at ambient pressure or under reduced pressure.

8. The process according to claim 7 , wherein the amount of the solid, dehydration catalyst is 5 to 50% by weight, based on 100% by weight of the mannitol.

9. The process according to claim 7 , wherein the solid, dehydration catalyst consists essentially of the H-type β zeolite, and wherein the process further comprises producing isomannide.

10. The process according to claim 7 , wherein the process further comprises producing isomannide by 1,4-mannitan.

11. The process according to claim 7 , wherein the solid, dehydration catalyst consists essentially of the Y-type zeolite, and wherein the process further comprises producing 2,5-sorbitan.

12. A process for selectively producing isomannide from mannitol or 2,5-sorbitan from mannitol comprising catalytically dehydrating mannitol by use of any of the compositions selected from the group consisting of an H-type β zeolite, a Y-type zeolite or a mixture thereof.

Assignees

• Univ Hokkaido Nat Univ Corp
• Clariant Catalysts Japan Kk

Inventors

• Fukuoka Atsushi
• Kobayashi Hirokazu
• Chen Xin

Classifications

• B01J29/7007

  Zeolite Beta · CPC title

• B01J29/084

  Y-type faujasite · CPC title

• B01J2523/00

  Constitutive chemical elements of heterogeneous catalysts · CPC title

• B01J29/70

  of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 · CPC title

• B01J29/08

  of the faujasite type, e.g. type X or Y · CPC title