GB611213A - Method for purifying naphthalene - Google Patents
Method for purifying naphthaleneInfo
- Publication number
- GB611213A GB611213A GB12196/45A GB1219645A GB611213A GB 611213 A GB611213 A GB 611213A GB 12196/45 A GB12196/45 A GB 12196/45A GB 1219645 A GB1219645 A GB 1219645A GB 611213 A GB611213 A GB 611213A
- Authority
- GB
- United Kingdom
- Prior art keywords
- naphthalene
- distillation
- liquid
- washed
- soda
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/14—Purification; Separation; Use of additives by crystallisation; Purification or separation of the crystals
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Water Supply & Treatment (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Naphthalene is purified by centrifugally extracting the major part of the hydrocarbon oils occluded in the naphthalene crystals, washing the mass, preferably in the same centrifugal apparatus, with an auxiliary liquid or liquid mixture having a boiling point of not more than 190 DEG C. and the surface tension of which is lower than that of the occluded hydrocarbon oil to be removed, purifying the raw washed naphthalene by treatment with soda and sulphuric acid, and separating commercially pure naphthalene from the auxiliary liquid or liquid mixture by fractional distillation. The substitution may also be effected by filtering under vacuum, suction, or successive diffusions and a suitable liquid is an oil fraction from coal distillation boiling between 160 DEG and 190 DEG C. Solvents for naphthalene are generally used, but alcohols may also be used. When solvents are used, it is preferable to saturate initially with pure naphthalene in the cold. After use the washing liquid is regenerated by distillation to extract therefrom the dissolved hydrocarbons and is then recycled. In an example, crude naphthalene oil resulting from the distillation of coal tar is centrifuged and the product then washed in the centrifuge with commercial xylene having a boiling point of 140 DEG C. The washed naphthalene is then treated with soda and sulphuric acid and then fractionally distilled to remove the xylene.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR611213X | 1942-10-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB611213A true GB611213A (en) | 1948-10-27 |
Family
ID=8977935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12196/45A Expired GB611213A (en) | 1942-10-15 | 1945-05-15 | Method for purifying naphthalene |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB611213A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2678955A (en) * | 1951-11-01 | 1954-05-18 | American Cyanamid Co | Upgrading of crude naphthalene crystals by hot detergent washing |
-
1945
- 1945-05-15 GB GB12196/45A patent/GB611213A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2678955A (en) * | 1951-11-01 | 1954-05-18 | American Cyanamid Co | Upgrading of crude naphthalene crystals by hot detergent washing |
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