2-Naphthol-6,8-disulfonic acid
- Product Name
- 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
- Formula Weight
- 304.3
- MOL File
- 118-32-1.mol
2-Naphthol-6,8-disulfonic acid Property
- 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
- EPA Substance Registry System
- 1,3-Naphthalenedisulfonic acid, 7-hydroxy- (118-32-1)
Safety
- HS Code
- 2904100090
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Warning
- Hazard statements
-
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
- Precautionary statements
-
P280Wear protective gloves/protective clothing/eye protection/face protection.
P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
N-Bromosuccinimide Price
- Product number
- AS028882
- Product name
- 7-Hydroxynaphthalene-1,3-disulfonicacid
- Purity
- 96%
- Packaging
- 250mg
- Price
- $24
- Updated
- 2021/12/16
- Product number
- AS028882
- Product name
- 7-Hydroxynaphthalene-1,3-disulfonicacid
- Purity
- 96%
- Packaging
- 1g
- Price
- $58
- Updated
- 2021/12/16
- Product number
- AS028882
- Product name
- 7-Hydroxynaphthalene-1,3-disulfonicacid
- Purity
- 96%
- Packaging
- 5g
- Price
- $161
- Updated
- 2021/12/16
- Product number
- CM140985
- Product name
- 7-hydroxynaphthalene-1,3-disulfonicacid
- Purity
- 97%
- Packaging
- 100g
- Price
- $704
- Updated
- 2021/12/16
- Product number
- CD44000712
- Product name
- 7-Hydroxynaphthalene-1,3-disulfonicacid
- Purity
- 97%
- Packaging
- 100g
- Price
- $753
- Updated
- 2021/12/16
2-Naphthol-6,8-disulfonic acid Chemical Properties,Usage,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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