Koch acid
- CAS No.
- 117-42-0
- Chemical Name:
- Koch acid
- Synonyms
- 2-Naphthyl;Kochaci;NSC 227195;Koch acid ISO 9001：2015 REACH;3,6,8-Trisulfo-1-naphthylamine;6-naphthalenetrisulfonic acid, 8-amino-3;8-amino-1,3,6-naphthalenetrisulfonic acid;1-Aminonaphthalene-3,6,8-trisulfonic acid;1,3,6-Naphthalenetrisulfonic acid,8-amino-;3,6-Naphthalenetrisulfonic acid, 8-amino-1
- CBNumber:
- CB8874779
- Molecular Formula:
- C10H9NO9S3
- Molecular Weight:
- 383.37
- MDL Number:
- MFCD00035857
- MOL File:
- 117-42-0.mol
- MSDS File:
- SDS
| Density | 1.974 |
|---|---|
| pka | -1.62±0.40(Predicted) |
| FDA UNII | D33V8NB7KB |
| EPA Substance Registry System | 1,3,6-Naphthalenetrisulfonic acid, 8-amino- (117-42-0) |
Koch acid Chemical Properties, Uses, Production
Chemical Properties
1-Aminonaphthalene-3,6,8-trisulfonic acid [117-42-0]. (8-aminonaphthalene-1,3,6- trisulfonic acid), Koch acid, T acid, C10H9NO9S3, Mr 383.36, and its alkali-metal salts are readily soluble in water. The solutions are unusual for this class of compound in that they exhibit no fluorescence. Hydrolysis with dilute sulfuric acid produces 1-hydroxynaphthalene-3,6,8-trisulfonic acid, whereas diazotization followed by acid hydrolysis results in formation of the corresponding sultone. Reduction with zinc and alkali desulfonates 1-Aminonaphthalene-3,6,8-trisulfonic acid to give 1-amino-naphthalene-3,6-disulfonic acid. Amination gives 1,3-diaminonaphthalene-6,8- disulfonic acid.
Uses
Apart from caustic fusion to give H acid, the other main use is the production of chromotropic acid by treatment with strong caustic under pressure.
Production Methods
Naphthalene in sulfuric acid solution is treated with gradual addition of 65 % oleum and temperature profiling (to 160℃) to optimize formation of the 1,3,6-trisulfonic acid. A mixture of sulfuric acid and nitric acids is added slowly at 40℃ to form 1-nitronaphthalene-3,6,8-trisulfonic acid (nitro-Koch acid) which is converted to neutral liquor by liming out. The liquor is reduced with iron powder in the presence of acetic acid and, after removal of iron residues, the crude product is isolated, as the acid calcium – sodium salt. This is purified by dissolution with sodium carbonate and removal of calcium carbonate. The trisodium salt liquor is concentrated before direct use in H acid manufacture. To obtain pure Koch acid, the 1-nitro3,6,8-trisulfonic acid can be isolated before reduction. The reduction step can alternatively be carried out by hydrogenation of the aqueous solution of nitro-Koch acid in the presence of a nickel catalyst.
Koch acid Preparation Products And Raw materials
Koch acid Suppliers
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Chengdu AstaTech Trading Co., Ltd./AstaTech (Chengdu) Pharma. Co., Ltd. | +86-28-85122536 85324413 | market@astatech.cn | China | 8016 | 55 |
| Lanzhou Angeli Biochemical Technology Co., Ltd. | 0931-8235634 13321316780 | 1455540579@qq.com | China | 957 | 55 |
| Shanghai Witofly Chemical Co. ,Ltd. | 02150630626 17717886015 | sales@witofly.com | China | 1864 | 55 |
| Dideu Industries Group Limited | +8617392712697 | 1022@dideu.com | China | 29091 | 58 |
| Dayang Chem (Hangzhou) Co.,Ltd. | +86-0571-88938639 17705817739 | info@dycnchem.com | China | 52493 | 58 |
| Wuhan xinyangruihe Chemical Technology Co., Ltd. | 153-07155313 15307155313 | 2274366233@qq.com | China | 7360 | 58 |
| Shaanxi Dideu Medichem Co. Ltd | 029-81024372 17792795018 | 1053@dideu.com | China | 9999 | 58 |
| NINGBO JL NEW MATERIAL CO.,LTD | 0574 88552216 18969899212 | sales@chematerials.cn | China | 1512 | 58 |
| Hangzhou Yaoruiyicheng Biological Medicine Co., Ltd | 18317105404 | marketing002@witofly.com | China | 1600 | 58 |
| Guangzhou Reullei Pharmaceutical Technology Co., Ltd， | 13660253774 | joe.yang@reullei.com | China | 4989 | 58 |
View Latest Price from Koch acid manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
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2026-08-20 | Koch acid
117-42-0
|
$1.10 | 1g | 99.00% | 100 Tons Min | Dideu Industries Group Limited | |
 |
2026-06-30 | Koch acid
117-42-0
|
1kg | 99% | 10000KGS | Shaanxi Dideu New Materials Co. Ltd | ||
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2020-02-26 | Koch acid
117-42-0
|
1KG | 99.0%+ | 100 tons | Shaanxi Dideu Medichem Co. Ltd |
