Claims
- 1. A process for the purification of hydrogen peroxide which comprises (A) contacting a crude hydrogen peroxide solution with an anion exchange resin or a mixture of an anion exchange resin and a cation exchange resin to make a content of total phosphate anions of under 0.1 ppm, and then (B) contacting the resultant hydrogen peroxide solution having a content of total phosphate anions of under 0.1 ppm with a chelate resin which is a member selected from the group consisting of an iminomethylenephosphonic acid type chelate resin and an iminodi(methylenephosphonic) acid type chelate resin to remove iron and aluminum impurities to a concentration of 0.2 ppb or less.
- 2. The process for purification of hydrogen peroxide according to claim 1 wherein the chelate resin is an iminomethylenephosphonic acid type chelate resin.
- 3. The process for purification of hydrogen peroxide according to claim 1 wherein the chelate resin is an iminodi(methylenephosphonic) acid type chelate resin.
- 4. The process for purification of hydrogen peroxide according to claim 1 wherein the process is conducted at a temperature of -15.degree. to 15.degree. C.
- 5. The process for purification of hydrogen peroxide according to claim 1 wherein the crude hydrogen peroxide solution is contacted with a strong-basic type of anion exchange resin in step (A).
- 6. The process of purification of hydrogen peroxide according to claim 1 wherein the crude hydrogen peroxide solution is contacted with a mixture of a strong-basic type of anion exchange resin and a strong-acid type of cation exchange resin in proportion of 10:90.about.90:10 in step (A).
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-127310 |
May 1993 |
JPX |
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Parent Case Info
This application is a continuation-in-part of now abandoned application, Ser. No. 08/249,978, filed May 27, 1994.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
4792403 |
Togo et al. |
Dec 1988 |
|
4999179 |
Sugihara et al. |
Mar 1991 |
|
5055286 |
Watanabe et al. |
Oct 1991 |
|
5200166 |
Shiga et al. |
Apr 1993 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
0502466 |
Sep 1992 |
EPX |
2624500 |
Jun 1989 |
FRX |
5-17105 |
Jan 1993 |
JPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
249978 |
May 1994 |
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