JPS5566595A - Purification of alkylphenyl phosphate - Google Patents
Purification of alkylphenyl phosphateInfo
- Publication number
- JPS5566595A JPS5566595A JP13996278A JP13996278A JPS5566595A JP S5566595 A JPS5566595 A JP S5566595A JP 13996278 A JP13996278 A JP 13996278A JP 13996278 A JP13996278 A JP 13996278A JP S5566595 A JPS5566595 A JP S5566595A
- Authority
- JP
- Japan
- Prior art keywords
- crude
- phosphate
- adsorbing
- impurities
- washing
- 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 prepare the title compound having improved electrical properties and useful as an inpregnating oil for capacitors, by washing a crude alkylphenyl phosphate with an alkali, adsorbing with china clay in a dry gas atmosphere, and dehydrating under reduced pressure, thereby removing the impurities such as free phenols.
CONSTITUTION: A crude alkylphenyl phosphate (e.g. tricresyl phosphate) containing ≤0.03wt% of free phenols is purified by (1) washing with an alkaline compound (e.g. 1W7% aqueous solution of ammonia), (2) adsorbing the impurities with china clay (e.g. acid clay) in a dry gas atmosphere, and (3) dehydrating under reduced pressure. Capacitors impregnated with the compound have higher survival rate (a1, a2, and a4) than those impregnated with crude oil (a6 and a9) by applying an AC voltage higher than the rating voltage.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13996278A JPS5566595A (en) | 1978-11-13 | 1978-11-13 | Purification of alkylphenyl phosphate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13996278A JPS5566595A (en) | 1978-11-13 | 1978-11-13 | Purification of alkylphenyl phosphate |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5566595A true JPS5566595A (en) | 1980-05-20 |
Family
ID=15257716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13996278A Pending JPS5566595A (en) | 1978-11-13 | 1978-11-13 | Purification of alkylphenyl phosphate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5566595A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4844237A (en) * | 1971-10-14 | 1973-06-26 | ||
JPS495948A (en) * | 1972-03-23 | 1974-01-19 |
-
1978
- 1978-11-13 JP JP13996278A patent/JPS5566595A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4844237A (en) * | 1971-10-14 | 1973-06-26 | ||
JPS495948A (en) * | 1972-03-23 | 1974-01-19 |
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