Method of Producing Anhydrosugar Alcohol Using Steam

Patent metadata

Field	Value
Publication number	US-2017057975-A1
Application number	US-201615247030-A
Country	US
Kind code	A1
Filing date	Aug 25, 2016
Priority date	Aug 26, 2015
Publication date	Mar 2, 2017
Grant date	—

Abstract

The present invention provides a method for producing anhydrosugar alcohol, including: feeding sugar alcohol into a reactor and performing a dehydration reaction of the fed sugar alcohol to produce anhydrosugar alcohol; and supplying steam to the reactor to evaporate the produced anhydrosugar alcohol. According to the present invention, anhydrosugar alcohol can be produced in a high yield by increasing the specific surface area of reaction mother liquor and reducing the partial pressure of the product.

First claim

What is claimed is:

1 . A method of producing anhydrosugar alcohol, comprising:
(a) feeding sugar alcohol into a reactor and performing a dehydration reaction of the sugar alcohol to produce anhydrosugar alcohol; (b) supplying steam into the reactor to evaporate the anhydrosugar alcohol; and (c) condensing and separating the evaporated anhydrosugar alcohol vapor and the steam, thereby recovering liquid anhydrosugar alcohol.

2 . The method of claim 1 , wherein the dehydration reaction is performed at a pressure of 5-200 mmHg and a temperature of 120 to 150° C. for 50-150 minutes

3 . The method of claim 1 , wherein temperature of the steam in step (b) is 150 to 280° C.

4 . The method of claim 1 , wherein the steam is supplied in an amount of 0.01-30 wt %/min, based on a weight of the sugar alcohol.

5 . The method of claim 4 , wherein the steam is supplied in an amount of 0.1-10 wt %/min, based on the weight of the sugar alcohol.

6 . The method of claim 1 , wherein the steam is supplied to the reactor through a sparger.

7 . The method of claim 1 , wherein the reactor comprises a stirrer installed therein for mixing the steam supplied to the reactor.

8 . The method of claim 1 , wherein the anhydrosugar alcohol is isosorbide, and the sugar alcohol is sorbitol.

9 . The method of claim 1 , wherein the dehydration reaction is performed by subjecting an aqueous solution of sugar alcohol to a first-step reaction at a temperature of 100 to 150° C. in the presence of a homogeneous catalyst, and then subjecting the aqueous solution of sugar alcohol to a second-step reaction at a temperature of 151 to 240° C.

10 . The method of claim 8 , wherein the first-step reaction and the second-step reaction are performed at a pressure of 1-200 mmHg.

11 . The method of claim 9 , wherein the first-step reaction and the second-step reaction are performed for a reaction time of 10-300 minutes and 10-180 minutes, respectively.

12 . The method of claim 1 , which is performed in a continuous stirred tank reactor (CSTR), a plug flow reactor (PFR), a trickle bed reactor (TBR) or a batch reactor (BR).

13 . The method of claim 9 , wherein the second-step reaction product is collected by being condensed to liquid in a condenser maintained at a temperature of −40 to 100° C.

Assignees

• Sk Innovation Co Ltd

Inventors

• Son Sung Real
• Hong Suk Joon
• Song In Hyoup
• Yim Yoon Jae

Classifications

• C07D493/04 Primary

  Ortho-condensed systems · CPC title

• C07D307/20

  Oxygen atoms · CPC title