JPS56142219A - Separation and purification of p-xylene - Google Patents
Separation and purification of p-xyleneInfo
- Publication number
- JPS56142219A JPS56142219A JP4731880A JP4731880A JPS56142219A JP S56142219 A JPS56142219 A JP S56142219A JP 4731880 A JP4731880 A JP 4731880A JP 4731880 A JP4731880 A JP 4731880A JP S56142219 A JPS56142219 A JP S56142219A
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- xylene
- separation
- washing liquid
- crystal
- 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 p-xylene in high purity and yield, by washing p-xylene crystal separated by fractional crystallization with specific inert washing liquid, and heating and melting the washed crystal to effect the separation of the washing liquid by precipitation separation.
CONSTITUTION: p-Xylene (PX) crystallized from hydrocarbon mixture by cooling is separated by a centrifugal separator. An inert washing liquid is introduced into the separator during the separation, and the drained PX crystal is washed with the liquid to remove the most part of the mother liquid. The crystal is taken out of the separator, molten by heating, and separated into PX and the washing liquid by precipitation separation. The inert washing liquid should be immiscible with the xylene mother liquid, and have a freezing point of ≤0°C, and a specific gravity different from that of the xylene mother liquid at the operation temperature to an extent to enable the liquid-liquid precipitation separation. Pref. examples of the washing liquid are, ammonia water, aqueous solution of sodium hydroxide, cuprammonium solution, etc.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4731880A JPS56142219A (en) | 1980-04-09 | 1980-04-09 | Separation and purification of p-xylene |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4731880A JPS56142219A (en) | 1980-04-09 | 1980-04-09 | Separation and purification of p-xylene |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56142219A true JPS56142219A (en) | 1981-11-06 |
Family
ID=12771928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4731880A Pending JPS56142219A (en) | 1980-04-09 | 1980-04-09 | Separation and purification of p-xylene |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56142219A (en) |
-
1980
- 1980-04-09 JP JP4731880A patent/JPS56142219A/en active Pending
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