GB1019084A - Process for the manufacture of naphthalene-2-sulphonic acid - Google Patents
Process for the manufacture of naphthalene-2-sulphonic acidInfo
- Publication number
- GB1019084A GB1019084A GB2438562A GB2438562A GB1019084A GB 1019084 A GB1019084 A GB 1019084A GB 2438562 A GB2438562 A GB 2438562A GB 2438562 A GB2438562 A GB 2438562A GB 1019084 A GB1019084 A GB 1019084A
- Authority
- GB
- United Kingdom
- Prior art keywords
- naphthalene
- reaction
- temperature
- sulphonic acid
- allowing
- 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
- C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Abstract
Naphthalene-2-sulphonic acid is prepared by reacting naphthalene with sulphuric of 84-5 to 80% strength and allowing its concentration to fall during the reaction, the temperature of the reaction being maintained above 135% C. The reaction is preferably carried out by heating the naphthalene to a temperature above 135% C., allowing the sulphuric acid to flow in and maintaining the temperature at approximately 155 DEG to 160 DEG C. during practically the whole reaction period. Unsulphonated naphthalene present in the reaction mixture may be removed by steam distillation. The naphthalene-2-sulphonic acid may be obtained in the form of its sodium salt by introducing the sulphonation mixture into a saturated solution of sodium sulphate, the temperature of the crystalline slurry being maintained between 80 DEG and 100 DEG C.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH746961A CH400130A (en) | 1961-06-26 | 1961-06-26 | Process for the production of naphthalene-2-sulfonic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1019084A true GB1019084A (en) | 1966-02-02 |
Family
ID=4325602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2438562A Expired GB1019084A (en) | 1961-06-26 | 1962-06-25 | Process for the manufacture of naphthalene-2-sulphonic acid |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH400130A (en) |
| ES (1) | ES278641A1 (en) |
| GB (1) | GB1019084A (en) |
-
1961
- 1961-06-26 CH CH746961A patent/CH400130A/en unknown
-
1962
- 1962-06-25 ES ES278641A patent/ES278641A1/en not_active Expired
- 1962-06-25 GB GB2438562A patent/GB1019084A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH400130A (en) | 1965-10-15 |
| ES278641A1 (en) | 1962-12-16 |
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