Claims
- 1. A process for degrading aromatic nitro compounds in wastewaters from nitrobenzene production plants which consists essentially of treating said wastewaters containing aromatic nitro compounds with ozone, in an amount sufficient to virtually completely destroy said aromatic nitro compounds down to inorganic components, at 20 to 100° C., 1.5 to 10 bar and pH 7 to 9.
- 2. A process as claimed in claim 1, wherein the ozonation is carried out at 20 to 60° C. and 1.5 to 5 bar.
- 3. A process for degrading aromatic nitro compounds in wastewaters from nitrobenzene production plants by reaction with ozone, in an amount sufficient to virtually completely destroy said aromatic nitro compounds, wherein the degradation reaction, at a temperature of from 20 to 100° C. and a pressure of from 1.5 to 10 bar absolute, is started at pH 12 and the pH level is maintained above pH 4.5 until the reaction is completed.
- 4. The process of claim 3 wherein the pH level is maintained in the range of pH 7 to 9.
- 5. The process of claim 3 wherein the reaction temperature is 20 to 60° C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
39 009 32 |
Jan 1989 |
DE |
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Parent Case Info
This application is a continuation of application Ser. No. 08/178,628, filed on Jan. 7, 1994, now abandoned which is a continuation of application Ser. No. 07/900,780, filed on Jun. 22, 1992, now abandoned which is a continuation in-part of application Ser. No. 07/697,509, filed on May 3, 1991, now abandoned which is a continuation of U.S. Ser. No. 07/457,884, filed on Dec. 27, 1989 now abandoned.
US Referenced Citations (7)
Non-Patent Literature Citations (7)
Entry |
Caprio et al., Ozone: Science and Eng., vol. 6, pp. 115-121, 1984. |
M.A. Shevchenko Khim., Tekhnol. Vody, 8 (6). 7-10, 1986. |
Chemical Abstracts (I) 102:172028 (1985). |
Chemical Abstracts (II) 108:26755 (1988). |
Chemical Abstracts (III) 102:225752 (1985). |
Chemical Abstracts (IV) 102:154316 (1985). |
Grunbein, Chemie Ingenieur Technik 46(8) p. 339 (Apr. 1974). |
Continuations (3)
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Number |
Date |
Country |
Parent |
08/178628 |
Jan 1994 |
US |
Child |
08/603197 |
|
US |
Parent |
07/900780 |
Jun 1992 |
US |
Child |
08/178628 |
|
US |
Parent |
07/457884 |
Dec 1989 |
US |
Child |
07/697509 |
|
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
07/697509 |
May 1991 |
US |
Child |
07/900780 |
|
US |