Method for reducing metal of sugar-alcohol compound and sugar-alcohol compound

Patent metadata

Field	Value
Publication number	US-10131603-B2
Application number	US-201715585720-A
Country	US
Kind code	B2
Filing date	May 3, 2017
Priority date	Jun 23, 2016
Publication date	Nov 20, 2018
Grant date	Nov 20, 2018

Abstract

The present invention provides a method for reducing a metal of a sugar-alcohol compound, the method including the steps of (A) protecting a hydroxyl group of a sugar-alcohol compound containing metal impurities with a protecting group, (B) removing the metal impurities from the sugar-alcohol compound having the hydroxyl group protected with the protecting group, and (C) eliminating the protecting group of the sugar-alcohol compound from which the metal has been removed. There can be provided a method for reducing a metal of a sugar-alcohol compound that can provide a sugar-alcohol compound with a suitable quality for the semiconductor apparatus manufacturing process.

First claim

What is claimed is:

1. A method for reducing a content of metal impurities of a sugar-alcohol compound, the method comprising the steps of:
(A) protecting a hydroxyl group of a sugar-alcohol compound containing metal impurities with a protecting group;
(B) removing the metal impurities from the sugar-alcohol compound having the hydroxyl group protected with the protecting group; and
(C) eliminating the protecting group of the sugar-alcohol compound from which the metal has been removed, wherein
step (C) is performed by a hydrolysis reaction using deionized water.

2. The method according to claim 1 , wherein the sugar-alcohol compound containing metal impurities is selected from the group consisting of erythritol, threitol, arabinitol, xylitol, ribitol, iditol, galactitol, sorbitol, mannitol, volemitol, perseitol, octitol, inositol, and quercitol.

3. The method according to claim 1 , wherein the step (B) includes (B1) liquid-liquid separation and water washing or (B2) distillation.

4. The method according to claim 2 , wherein the step (B) includes (B1) liquid-liquid separation and water washing or (B2) distillation.

5. The method according to claim 1 , wherein the protecting group is acetonide.

6. The method according to claim 2 , wherein the protecting group is acetonide.

7. The method according to claim 3 , wherein the protecting group is acetonide.

8. The method according to claim 4 , wherein the protecting group is acetonide.

9. The method according to claim 1 , wherein the sugar-alcohol compound obtained by the method has a sodium impurity content of 100 ppb or less.

10. The method according to claim 9 , wherein the sodium impurity content is 50 ppb or less.

11. The method according to claim 1 , wherein the deionized water is used in the presence of an acid catalyst.

12. The method according to claim 11 , wherein the acid catalyst is a mineral acid or a carbonic acid.

Assignees

• Shinetsu Chemical Co

Inventors

• Nakahara Takayoshi
• Watanabe Takeru
• Tachibana Seiichiro
• Ogihara Tsutomu

Classifications

• C07C29/92 Primary

  by a consecutive conversion and reconstruction · CPC title

• C07C31/26

  Hexahydroxylic alcohols · CPC title

• Y02P20/55

  Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups · CPC title

• C07C29/80

  by distillation · CPC title

• C07C29/128

  by alcoholysis · CPC title