JPS5799301A - Purification of crystalline substance - Google Patents
Purification of crystalline substanceInfo
- Publication number
- JPS5799301A JPS5799301A JP17262180A JP17262180A JPS5799301A JP S5799301 A JPS5799301 A JP S5799301A JP 17262180 A JP17262180 A JP 17262180A JP 17262180 A JP17262180 A JP 17262180A JP S5799301 A JPS5799301 A JP S5799301A
- Authority
- JP
- Japan
- Prior art keywords
- substance
- raw material
- melted
- cooled
- taking
- 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.)
- Granted
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
PURPOSE: To obtain substance of high purity in a simple and easy manner by a method wherein a crystalline substance containing impurities is melted, then it is cooled and is subdivided into fine particles, and the particles are fed into a vertical-type purification tower to purify the substance.
CONSTITUTION: A crystalline substance such as dischloronitrobenzene, nitrotoluene, nitrochlorobenzene or cresol which contains impurities such as isomers thereof is melted, then it is cooled on a plate or a drum and the cooled substance is subdivided into fine particles having a particle size of about 0.3W5mm. This raw material in the particulate form is fed into the vertical-type purification tower through a raw material feed port 11, and is allowed to fall while being stirred by swirring vanes 4. The material reaching a bottom part of the tower is heated by a heater 5 so that it is melted to produce a liquid. Part of the liquid is moved upward and is brought into countercurrent contact with the falling raw material, while taking in the impurities of the raw material. Then the liquid reaches a mother liquor level 8, and part of it is discharged via a taking-out port 1 for the mother liquor. On the other hand, the purified substance is taken out via a taking-out port 2 for the objective substance.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17262180A JPS5799301A (en) | 1980-12-09 | 1980-12-09 | Purification of crystalline substance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17262180A JPS5799301A (en) | 1980-12-09 | 1980-12-09 | Purification of crystalline substance |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5799301A true JPS5799301A (en) | 1982-06-21 |
JPS6336802B2 JPS6336802B2 (en) | 1988-07-21 |
Family
ID=15945262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17262180A Granted JPS5799301A (en) | 1980-12-09 | 1980-12-09 | Purification of crystalline substance |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5799301A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5966305A (en) * | 1982-10-05 | 1984-04-14 | Tsukishima Kikai Co Ltd | Counterflow type cooling and purifying method for molten substance |
JPH0724206A (en) * | 1991-04-18 | 1995-01-27 | Tsukishima Kikai Co Ltd | Countercurrent melt cooling and refining method |
WO1998014420A1 (en) * | 1996-09-30 | 1998-04-09 | Nippon Steel Chemical Co., Ltd. | Method of refining benzoic acid |
EP1004337A1 (en) * | 1997-07-29 | 2000-05-31 | Nippon Steel Chemical Co., Ltd. | Method of refining crystalline material |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50114382A (en) * | 1974-02-19 | 1975-09-08 |
-
1980
- 1980-12-09 JP JP17262180A patent/JPS5799301A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50114382A (en) * | 1974-02-19 | 1975-09-08 |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5966305A (en) * | 1982-10-05 | 1984-04-14 | Tsukishima Kikai Co Ltd | Counterflow type cooling and purifying method for molten substance |
JPH0431721B2 (en) * | 1982-10-05 | 1992-05-27 | ||
JPH0724206A (en) * | 1991-04-18 | 1995-01-27 | Tsukishima Kikai Co Ltd | Countercurrent melt cooling and refining method |
WO1998014420A1 (en) * | 1996-09-30 | 1998-04-09 | Nippon Steel Chemical Co., Ltd. | Method of refining benzoic acid |
US6211404B1 (en) | 1996-09-30 | 2001-04-03 | Nippon Steel Chemical Co., Ltd. | Method of refining benzoic acid |
EP1004337A1 (en) * | 1997-07-29 | 2000-05-31 | Nippon Steel Chemical Co., Ltd. | Method of refining crystalline material |
EP1004337A4 (en) * | 1997-07-29 | 2000-11-08 | Nippon Steel Chemical Co | Method of refining crystalline material |
US6403828B1 (en) | 1997-07-29 | 2002-06-11 | Nippon Steel Chemical Co., Ltd. | Method of refining crystalline material |
Also Published As
Publication number | Publication date |
---|---|
JPS6336802B2 (en) | 1988-07-21 |
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