JPS5446712A - Treatment of reaction vessel for preparation of maleic acid anhydride - Google Patents
Treatment of reaction vessel for preparation of maleic acid anhydrideInfo
- Publication number
- JPS5446712A JPS5446712A JP11221677A JP11221677A JPS5446712A JP S5446712 A JPS5446712 A JP S5446712A JP 11221677 A JP11221677 A JP 11221677A JP 11221677 A JP11221677 A JP 11221677A JP S5446712 A JPS5446712 A JP S5446712A
- Authority
- JP
- Japan
- Prior art keywords
- reaction vessel
- preparation
- maleic anhydride
- carbon steel
- treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To obtain maleic anhydride in high yield inhibiting oxidation of the starting material and the product be wetting the inner part of the reaction vessel made of carbon steel used for preparation of the maleic anhydride with an aqueous solution of phosphoric acid or its salt.
CONSTITUTION: Maleic anhydride is prepard by the catalytic gaseous oxidation of an unsaturated or saturated-hydrocarbon in the presence of molecular oxygen in a reaction vessel packed with a catalyst for the preparation of maleic anhydride, wherein the inner part of the reaction vessel made of carbon steel (including carbon steel pipes for piping, pressure piping, etc.) is treated with 0.5W15wt%, preferably 1W10wt% aqueous solution of phosphoric acid or its salt (e.g. Fe(Zn) phosphinate, Mg phosphate, etc.) at normal temp. to 100°C, preferably 50W95°C for ca. 10min.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11221677A JPS5446712A (en) | 1977-09-20 | 1977-09-20 | Treatment of reaction vessel for preparation of maleic acid anhydride |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11221677A JPS5446712A (en) | 1977-09-20 | 1977-09-20 | Treatment of reaction vessel for preparation of maleic acid anhydride |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5446712A true JPS5446712A (en) | 1979-04-12 |
Family
ID=14581153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11221677A Pending JPS5446712A (en) | 1977-09-20 | 1977-09-20 | Treatment of reaction vessel for preparation of maleic acid anhydride |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5446712A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5326886A (en) * | 1991-12-09 | 1994-07-05 | The Standard Oil Company | Maintaining VPO catalyst performance by aluminizing reactor internals in oxidation of butane to maleic anhydride |
-
1977
- 1977-09-20 JP JP11221677A patent/JPS5446712A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5326886A (en) * | 1991-12-09 | 1994-07-05 | The Standard Oil Company | Maintaining VPO catalyst performance by aluminizing reactor internals in oxidation of butane to maleic anhydride |
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