CN1057252A - A kind of production method of refined naphthalene - Google Patents
A kind of production method of refined naphthalene Download PDFInfo
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- CN1057252A CN1057252A CN 91104762 CN91104762A CN1057252A CN 1057252 A CN1057252 A CN 1057252A CN 91104762 CN91104762 CN 91104762 CN 91104762 A CN91104762 A CN 91104762A CN 1057252 A CN1057252 A CN 1057252A
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- naphthalene
- ethanol
- solvent
- production method
- mixed solvent
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Abstract
The present invention relates to a kind of production method of refined naphthalene, particularly thick naphthalene is produced the method for refined naphthalene by solvent crystallization again.Thick naphthalene is dissolved in mixed solvent, send into crystallization again in the crystallizer, in crystallizer, directly crystal is washed, eliminate surface impurity and mother liquor, become product after crystallization naphthalene and the separated from solvent.Mixed solvent is to be made of acetone and ethanol or trichloromethane and ethanol.Adopt the present invention, cancelled centrifugal separation process and whizzer, simplified production technique, can closed operation, reduce solvent and scatter and disappear and environmental pollution.
Description
The present invention relates to a kind of production method of refined naphthalene, the method that particularly thick naphthalene is produced refined naphthalene by solvent crystallization again,
At present, produce refined naphthalene and adopt solvent crystallization method again usually.This method generally comprises following operation: thick naphthalene solubilizing agent dissolving, send into crystallization again in the crystallizer, the crystallization naphthalene is sent into whizzer separate, use solvent wash crystal surface impurity and mother liquor simultaneously, isolated solvent recuperation, after the isolated refined naphthalene drying product.For example No. 17 disclosed " production technique of naphthalene " (application number 86100936) and No. 12 disclosed " technology for production of refined naphthalene by crystalization in solvents " (application numbers: all be to adopt this method 89105168) of the 6th volume are rolled up by China's " Gazette of Patent for Invention " the 2nd.For a long time, people have formed a kind of understanding or prejudice, think that naphthalene is at the crystallizer intercrystalline, form druse, form enclosed space between crystal, be difficult for removing mother liquor and washing, so the crystallization naphthalene must be taken out even smashes and send into whizzer, carry out solid-liquid separation and washing.Cause this method equipment complexity, technology loaded down with trivial details, solvent scatters and disappears bigger, and can not the closed operation contaminate environment.
The object of the invention provides a kind of solvent crystallization production method of refined naphthalene, and cancellation centrifugal separation process and whizzer are simplified production technique, but and closed operation, solve the problems referred to above that prior art exists.
The present invention seeks to realize by following technical proposal:
Thick naphthalene is dissolved in mixed solvent, send into crystallization again in the crystallizer, emit mother liquor, in crystallizer, directly the crystallization naphthalene is washed with solvent, remove surface impurity and mother liquor, at last with refined naphthalene and separated from solvent product, used mixed solvent is acetone and ethanol or trichloromethane and alcoholic acid mixed solution.
Mixed solvent acetone and the volume ratio between the ethanol that the present invention adopts are 1: 2-1: 4.
Volume ratio between trichloromethane and the ethanol is 1: 3-1: 5.
Adopt the present invention, find through actual observation: naphthalene is when the crystallizer intercrystalline, and crystalline particle is arranged along the crystallizer wall rule, does not have enclosed space between the crystallization, is skeleton structure.Can in crystallizer, directly wash with usual vehicle or mixed solvent of the present invention like this, obtain qualified refined naphthalene product the crystallization naphthalene.Owing to cancelled centrifugal separation process and whizzer in having now, can realize closed operation, reduce solvent and scattered and disappeared and environmental pollution, and simplified production technique and equipment, overcome the understanding prejudice that in crystallizer, to wash, obtained beyond thought effect.
The present invention has that technology is reasonable, solvent scatters and disappears less, improve characteristics such as operating environment.
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1
The industrial crude naphthalene is dissolved in acetone and ethanol mixed solvent, and the volume ratio between acetone and the ethanol is 1: 3; Lysate is sent into crystallization again in the crystallizer, emits mother liquor; In crystallizer, wash, remove the impurity and the mother liquor on xln surface with above-mentioned mixed solvent; At last with after refined naphthalene and the separated from solvent product.
Following table is a refined naphthalene quality product situation:
Numbering outward appearance Tc non-volatile matter ash colorimetric
1 little yellow 79.77 ℃ 0.0028 0.00128＞4
2 ″ 79.60℃ 0.0035 0.0015 ＞4
3 ″ 79.70℃ 0.0030 0.002 ＞4
Embodiment 2
Thick naphthalene is dissolved in trichloromethane and ethanol mixed solvent, send into crystallization again in the crystallizer; Emit mother liquor, in crystallizer, directly crystal is washed, remove surface impurity and mother liquor with usual vehicle methyl alcohol; At last with refined naphthalene and separated from solvent product.Mixed solvent trichloromethane that is adopted and alcoholic acid volume ratio are 1: 4, and the refined naphthalene that present embodiment is produced reaches country-level standard.
Claims (5)
1, a kind of production method of refined naphthalene, thick naphthalene solubilizing agent dissolving back crystallization again in crystallizer, the crystallization naphthalene through the washing, with separated from solvent after become product, it is characterized in that thick naphthalene is dissolved in the mixed solvent of acetone and ethanol or trichloromethane and ethanol formation, naphthalene directly washs the naphthalene crystal in crystallizer after the crystallization again.
2, according to the production method of the described refined naphthalene of claim 1, it is characterized in that said mixed solvent is made up of acetone and ethanol, the volume between acetone and the ethanol turns to 1: 2-1: 4.
3, according to the production method of the described refined naphthalene of claim 1, it is characterized in that said mixed solvent is made of trichloromethane and ethanol, the volume ratio between trichloromethane and the ethanol is 1: 3-1: 5.
4,, it is characterized in that the volume ratio between said mixed solvent acetone and the ethanol is 1: 3 according to the production method of the described refined naphthalene of claim 2.
5,, it is characterized in that the volume ratio between the trichloromethane and ethanol is 1: 4 in the said mixed solvent according to the production method of the described refined naphthalene of claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91104762 CN1029310C (en) | 1991-07-12 | 1991-07-12 | Prodn. method for pure naphthalene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91104762 CN1029310C (en) | 1991-07-12 | 1991-07-12 | Prodn. method for pure naphthalene |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1057252A true CN1057252A (en) | 1991-12-25 |
| CN1029310C CN1029310C (en) | 1995-07-12 |
Family
ID=4906799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91104762 Expired - Fee Related CN1029310C (en) | 1991-07-12 | 1991-07-12 | Prodn. method for pure naphthalene |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029310C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065227C (en) * | 1997-12-15 | 2001-05-02 | 煤炭科学研究总院北京煤化学研究所 | Process for refining 2, 6-dimethylnaphthalene by stepwise temp rising emulsifying crystallizing |
| CN101412652A (en) * | 2007-10-19 | 2009-04-22 | 北京石油化工学院 | Novel technique for preparing refined naphthalene from industrial naphthalin |
| CN101768066B (en) * | 2008-12-31 | 2013-04-03 | 上海华理生物医药有限公司 | Preparation method and application of trichloroacetone with high purity |
| CN114315792A (en) * | 2020-09-30 | 2022-04-12 | 宝武炭材料科技有限公司 | Method for enriching thianaphthene from mixture of thianaphthene and naphthalene by solvent crystallization coupled extraction rectification method |
-
1991
- 1991-07-12 CN CN 91104762 patent/CN1029310C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065227C (en) * | 1997-12-15 | 2001-05-02 | 煤炭科学研究总院北京煤化学研究所 | Process for refining 2, 6-dimethylnaphthalene by stepwise temp rising emulsifying crystallizing |
| CN101412652A (en) * | 2007-10-19 | 2009-04-22 | 北京石油化工学院 | Novel technique for preparing refined naphthalene from industrial naphthalin |
| CN101412652B (en) * | 2007-10-19 | 2013-04-17 | 北京石油化工学院 | Novel technique for preparing refined naphthalene from industrial naphthalin |
| CN101768066B (en) * | 2008-12-31 | 2013-04-03 | 上海华理生物医药有限公司 | Preparation method and application of trichloroacetone with high purity |
| CN114315792A (en) * | 2020-09-30 | 2022-04-12 | 宝武炭材料科技有限公司 | Method for enriching thianaphthene from mixture of thianaphthene and naphthalene by solvent crystallization coupled extraction rectification method |
| CN114315792B (en) * | 2020-09-30 | 2023-06-23 | 宝武碳业科技股份有限公司 | Method for enriching thiaindene from mixture of thiaindene and naphthalene by solvent crystallization coupling extraction rectification method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1029310C (en) | 1995-07-12 |
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