2-Naphthol-6,8-disulfonic acid
- CAS No.
- 118-32-1
- Chemical Name:
- 2-Naphthol-6,8-disulfonic acid
- Synonyms
- -Naphthol-disulphonicacid;β-Naphtholdisulfonic acid;2-NAPHTHOL-6,8-DISULFONIC ACID;NAPHTHOL-6,8-DIPOTASSIUMDISUFONATE;7-hydroxy-3-naphthalenedisulfonicacid;7-hydroxynaphthalene-1,3-disulfonicaci;7-Hydroxy-1,3-naphthalenedisulfonicacid;2-Hydroxynaphthalene-6,8-disulfonicacid;7-hydroxynaphthalene-1,3-disulfonic acid;7-hydroxynaphthalene-1,3-disulphonicacid
- CBNumber:
- CB6838933
- Molecular Formula:
- C10H8O7S2
- Molecular Weight:
- 304.3
- MDL Number:
- MFCD00021514
- MOL File:
- 118-32-1.mol
- MSDS File:
- SDS
| Boiling point | 415.13°C (rough estimate) |
|---|---|
| Density | 1.7421 (rough estimate) |
| refractive index | 1.6000 (estimate) |
| form | solid |
| pka | -0.33±0.40(Predicted) |
| color | Off-white |
| FDA UNII | 5995F5R8Y9 |
| EPA Substance Registry System | 1,3-Naphthalenedisulfonic acid, 7-hydroxy- (118-32-1) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS07 |
|---|---|
| Signal word | Warning |
| Hazard statements | H319-H335-H302+H312+H332-H315 |
| Precautionary statements | P280-P301+P312-P362+P364 |
| HS Code | 2904100090 |
2-Naphthol-6,8-disulfonic acid price More Price(6)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Arctom | AS028882 | 7-Hydroxynaphthalene-1,3-disulfonicacid 96% | 118-32-1 | 250mg | $24 | 2021-12-16 | Buy |
| Arctom | AS028882 | 7-Hydroxynaphthalene-1,3-disulfonicacid 96% | 118-32-1 | 1g | $58 | 2021-12-16 | Buy |
| Arctom | AS028882 | 7-Hydroxynaphthalene-1,3-disulfonicacid 96% | 118-32-1 | 5g | $161 | 2021-12-16 | Buy |
| Chemenu | CM140985 | 7-hydroxynaphthalene-1,3-disulfonicacid 97% | 118-32-1 | 100g | $704 | 2021-12-16 | Buy |
| Crysdot | CD44000712 | 7-Hydroxynaphthalene-1,3-disulfonicacid 97% | 118-32-1 | 100g | $753 | 2021-12-16 | Buy |
2-Naphthol-6,8-disulfonic acid Chemical Properties,Uses,Production
Chemical Properties
2-Hydroxynaphthalene-6,8-disulfonic acid [118-32-1]. (7-hydroxynaphthalene-1,3- disulfonic acid), G acid, C10H8O7S2, Mr 304.3: most salts of 55 are more readily soluble in water than those of R acid, with the notable exception of the potassium salt. Sulfonation with 20 % oleum at 100℃ yields 2-hydroxynaphthalene3,6,8-trisulfonic acid. Diazo coupling takes place in the 1-position, although the reaction is sluggish, as in the case of 2-hydroxynaphthalene8-sulfonic acid.
Uses
The G acid is aminated (Bucherer reaction) to give 2-aminonaphthalene-6,8- disulfonic acid and subjected to caustic fusion at 200℃ to yield 2,8-dihydroxynaphthalene-6-sulfonic acid (a precursor of g acid). It is also used as a coupling component for a wide range of azo colorants, e.g., C.I. Acid Orange 10, C.I. Acid Red 187, and C.I. Food Red 7.
Production Methods
2-Naphthol is added to 98 % sulfuric acid at 40℃. Then, 20 % oleum is added over 6 h and the temperature is allowed to rise to 60℃. The reaction is completed by heating for a further 16 h at 60℃ followed by 15 h at 80℃. After the reaction mixture has been poured into water, potassium chloride is added to the hot solution and the batch is cooled slowly to 35℃ before filtering off the crystalline dipotassium salt of G acid and carefully washing out any residual R salt; the yield is 60 %. In addition, R salt can be recovered from the filtrate in 12 % yield after conversion to its sodium salt.
2-Naphthol-6,8-disulfonic acid Preparation Products And Raw materials
Raw materials
Preparation Products
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| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Shanghai Daken Advanced Materials Co.,Ltd | +86-371-66670886 | info@dakenam.com | China | 15928 | 58 |
| Henan Tianfu Chemical Co.,Ltd. | +86-0371-55170693 +86-19937530512 | info@tianfuchem.com | China | 21691 | 55 |
| ATK CHEMICAL COMPANY LIMITED | +undefined-21-51877795 | ivan@atkchemical.com | China | 32480 | 60 |
| Hubei Jusheng Technology Co.,Ltd. | 18871490254 | linda@hubeijusheng.com | CHINA | 28180 | 58 |
| Hubei xin bonus chemical co. LTD | 86-13657291602 | linda@hubeijusheng.com | CHINA | 22968 | 58 |
| Chongqing Chemdad Co., Ltd | +86-023-61398051 +8613650506873 | sales@chemdad.com | China | 39916 | 58 |
| Career Henan Chemica Co | +86-0371-86658258 15093356674; | laboratory@coreychem.com | China | 30255 | 58 |
| 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 |
| Henan Alfa Chemical Co., Ltd | +8618339805032 | alfa4@alfachem.cn | China | 12755 | 58 |
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