7-hydroxynaphthalene-2-sulphonic acid
- CAS No.
- 92-40-0
- Chemical Name:
- 7-hydroxynaphthalene-2-sulphonic acid
- Synonyms
- 2-Naphthol-7-sulfonic acid;2-Hydroxynaphthlene-7-sulfonic acid;2-Hydroxynaphthalene-7-sulfonicacid;7-Hydroxynaphthalene-2-sulfonic acid;2-Hydroxy-7-naphthalenesulfonic acid;7-hydroxynaphthalene-2-sulphonic acid;2-Naphthalenesulfonic acid, 7-hydroxy-;(4Z)-4-(phenylmethylene)oxolane-2,3-dione
- CBNumber:
- CB7939158
- Molecular Formula:
- C10H8O4S
- Molecular Weight:
- 224.23
- MDL Number:
- MFCD16621293
- MOL File:
- 92-40-0.mol
| Density | 1.549±0.06 g/cm3(Predicted) |
|---|---|
| pka | 0.21±0.40(Predicted) |
| FDA UNII | KIZ16K8246 |
| EPA Substance Registry System | 2-Naphthalenesulfonic acid, 7-hydroxy- (92-40-0) |
7-hydroxynaphthalene-2-sulphonic acid Chemical Properties,Uses,Production
Chemical Properties
2-Hydroxynaphthalene-7-sulfonic acid [92- 40-0]. (7-hydroxynaphthalene-2-sulfonic acid), F acid, Cassella acid, C10H8O4S, Mr 224.23, is soluble in water, from which it can be recrystallized as the monohydrate (mp 89℃). The sodium and potassium salts are also readily soluble, but the barium salt is sparingly soluble. Iron(III) chloride gives a dark blue color with neutral solutions of 2-Hydroxynaphthalene-7-sulfonic acid. Azo coupling and nitrosation occurs in the 1-position. Sulfonation gives a variety of products depending on the conditions.
Uses
2-Hydroxynaphthalene-7-sulfonic acid is used as an intermediate in the production of 2-aminonaphthalene-7-sulfonic acid, 2-hydroxynaphthalene-3,7-disulfonic acid, and 2,7-dihydroxynaphthalene. It has minor uses as an azo coupling component.
Preparation
Naphthalene-2,7-disulfonic acid is heated with aqueous sodium hydroxide under pressure at 230℃ for 5 h and then at 260℃ for another 5 h. After neutralizing and screening, the liquor is acidified to precipitate the product, which is isolated after boiling off the sulfur dioxide and cooling to 30℃.
7-hydroxynaphthalene-2-sulphonic acid Preparation Products And Raw materials
Raw materials
Preparation Products
7-hydroxynaphthalene-2-sulphonic acid Suppliers
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Hefei TNJ Chemical Industry Co.,Ltd. | 0551-65418671 | sales@tnjchem.com | China | 34572 | 58 |
| Dayang Chem (Hangzhou) Co.,Ltd. | 571-88938639 +8617705817739 | info@dycnchem.com | CHINA | 52867 | 58 |
| Hebei Duling International Trade Co. LTD | +8617333973358 | sales01@hbduling.cn | China | 15664 | 58 |
| PT CHEM GROUP LIMITED | +86-85511178 +86-85511178 | peter68@ptchemgroup.com | China | 35453 | 58 |
| Amadis Chemical Company Limited | 571-89925085 | sales@amadischem.com | China | 131980 | 58 |
| Aikon International Limited | 025-58851090 13611564524 | lwan@aikonchem.com | China | 15952 | 58 |
| Shaanxi DIDU pharmaceutical and Chemical Co., Ltd | 15229059051 | 1027@dideu.com | China | 9946 | 58 |