- J acid
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- $1.00 / 1KG
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2025-04-28
- CAS:87-02-5
- Min. Order: 1KG
- Purity: 97%
- Supply Ability: 1000KG/month
- J acid
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- $10.00 / 1KG
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2025-04-23
- CAS:87-02-5
- Min. Order: 1KG
- Purity: 99%
- Supply Ability: 10 mt
- J acid
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- $0.00 / 25kg
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2025-03-21
- CAS:87-02-5
- Min. Order: 1kg
- Purity: 99%
- Supply Ability: 1000tons
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| | J acid Chemical Properties |
| density | 1.4338 (rough estimate) | | vapor pressure | 0Pa at 25℃ | | refractive index | 1.6500 (estimate) | | storage temp. | Keep in dark place,Inert atmosphere,Room temperature | | solubility | Slightly soluble in water | | form | powder | | pka | -0.28±0.40(Predicted) | | color | yellow | | Water Solubility | 5g/L at 20℃ | | InChIKey | KYARBIJYVGJZLB-UHFFFAOYSA-N | | LogP | -1.39 | | CAS DataBase Reference | 87-02-5(CAS DataBase Reference) | | EPA Substance Registry System | 7-Amino-4-hydroxy-2-naphthalenesulfonic acid (87-02-5) |
| Hazard Codes | C | | Risk Statements | 34 | | Safety Statements | 26-27-36/37/39 | | RIDADR | UN 2585 8/PG 3 | | WGK Germany | 1 | | RTECS | QK1295500 | | F | 21 | | HazardClass | 8 | | PackingGroup | III | | HS Code | 2922190090 | | Toxicity | LD50 oral in rat: 11500mg/kg |
| | J acid Usage And Synthesis |
| Chemical Properties | Gray needles, white when pure. Soluble in hot water; sparingly soluble in cold water. 2-Amino-5-hydroxynaphthalene-7-sulfonic acid [87-02-5]. (7-amino-4-hydroxynaphthalene-2-sulfonic acid), J acid, C10H9NO4S, Mr 239.2, is only slightly soluble (0.1 %) in cold water but readily soluble at 100℃. The alkalimetal salts are readily soluble in water. Diazo compounds are normally coupled with J acid under alkaline conditions with reaction in the 6-position (ortho to hydroxyl); however, under acid conditions, coupling can occur in the 1- position. Reaction with bisulfite gives 4,7-dihydroxynaphthalene-2-sulfonic acid. The N-acylation, Nalkylation, and N-arylation reactions are important. | | Uses | Azo dye intermediate. | | Production Methods | A concentrated disodium salt solution of 2-aminonaphthalene-5,7-disulfonic acid is added to 72 % sodium hydroxide at 150 ℃. After heating to 187℃ over 10 h reaction is continued at this temperature for a further 8 h until completion of the reaction is indicated by giving equivalent diazotization and coupling titers for a worked-up sample. Quenching, acidification, purging of sulfur dioxide, and filtration at 55 ℃ followed by washing with water at 50℃ result in an 88 % yield of paste. Purification by salting out the sodium salt from a hot alkaline solution gives a 90 % recovery of the product as gray crystals. An improved process with 90 % yield is claimed by feeding the concentrated 2-aminonaphthalene-5,7-disulfonic acid liquor and the caustic liquor simultaneously into the fusion reactor to maintain more stable conditions. | | Definition | ChEBI: 7-amino-4-hydroxy-2-naphthalenesulfonic acid is an aminonaphthalenesulfonic acid that is 2-naphthalenesulfonic acid substituted by an amino group at position 7 and a hydroxy group at position 4 respectively. It has a role as a metabolite. It is an aminonaphthalenesulfonic acid and a member of naphthols. | | Flammability and Explosibility | Not classified |
| | J acid Preparation Products And Raw materials |
| Raw materials | Sodium hydroxide-->FUMING SULFURIC ACID-->2-Naphthylamine-->2-Aminonaphthalene-1-sulfonic acid-->NAPHTHENIC ACID | | Preparation Products | Reactive Orange 5-->disodium 3-[[4'-[(6-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-1-sulphonate-->5,5'-Dihydroxy-2,2'-dinaphthylamine-7,7'-disulphonic acid-->Reactive Orange 1-->7-(Acetylamino)-4-hydroxy-2-naphthalenesulfonic acid-->6-AMINO-1-NAPHTHOL-->Direct Red 31-->ACID RED 137-->REACTIVE ORANGE 84-->2-Hydroxy-5-[[5-hydroxy-6-[(2-sodiooxycarbonylphenyl)azo]-7-sodiosulfo-2-naphthalenyl]azo]benzoic acid sodium salt-->1,6-Naphthalenedisulfonic acid, 7-[[4'-[(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-8-hydroxy-, trisodium salt-->REACTIVE ORANGE 82-->Benzoic acid, 2-[[1-amino-7-[[4-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]-2-methoxyphenyl]azo]-8-hydroxy-3,6-disulfo-2-naphthalenyl]azo]-5-[[6-amino-5-[(3-carboxy-4-hydroxyphenyl)azo]-1-hydroxy-3-sul-->disodium 7-(acetylamino)-3-[[4-[(4-chloro-2-sulphonatophenyl)azo]-2,5-dimethylphenyl]azo]-4-hydroxynaphthalene-2-sulphonate-->trisodium 5-amino-3-[[4'-[(6-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]-3,3'-dimethyl[1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-2,7-disulphonate-->tetrasodium 2-[[2-amino-6-[[4-[[4-[(3-carboxylato-4-hydroxyphenyl)azo]-7-sulphonato-1-naphthyl]azo]-2,5-dimethoxyphenyl]azo]-5-hydroxy-7-sulphonato-1-naphthyl]azo]-5-nitrobenzoate-->Direct Blue 278-->Direct Blue 82-->Reactive Red SCARLET 2G-->C.I. Direct Blue 166-->Reactive orange 64 |
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