2,5-thiophenedicarboxylic acid
2,5-thiophenedicarboxylic acid
CAS: 4282-31-9
Molecular Formula: C6H4O4S
2,5-thiophenedicarboxylic acid - Names and Identifiers
| Name | 2,5-thiophenedicarboxylic acid |
| Synonyms | TH-2COOH 2,5-Thiophenedicarbo 2,5-DICARBOXYTHIOPHENE thiophene-2,5-dicarboxylate Thiophene-2,5-Dicarboxyl Acid 2,5-THIOPHENEDICARBOXYLIC ACID 2,5-thiophenedicarboxylic acid Thiophene-2,5-dicarboxylic acid Thiophene -2,5- twocarboxylic acid |
| CAS | 4282-31-9 |
| EINECS | 224-284-2 |
| InChI | InChI=1/C6H4O4S/c7-5(8)3-1-2-4(11-3)6(9)10/h1-2H,(H,7,8)(H,9,10)/p-2 |
2,5-thiophenedicarboxylic acid - Physico-chemical Properties
| Molecular Formula | C6H4O4S |
| Molar Mass | 172.16 |
| Density | 1.473 (estimate) |
| Melting Point | >300 °C (lit.) |
| Boling Point | 272.46°C (rough estimate) |
| Flash Point | 222.7°C |
| Water Solubility | Very soluble in water. |
| Vapor Presure | 1.1E-08mmHg at 25°C |
| Appearance | White to yellow crystalline powder |
| Color | White to Light yellow |
| BRN | 136781 |
| pKa | 2.76±0.10(Predicted) |
| Storage Condition | Keep in dark place,Sealed in dry,Room Temperature |
| Refractive Index | 1.5500 (estimate) |
| MDL | MFCD00016896 |
| Physical and Chemical Properties | Crystalline powder. Melting point 358.5-359.5 °c, sublimation at 150-300 °c. Slightly soluble in water. |
| Use | Mainly used for synthetic fiber, EVA, PVC and plastic and rubber whitening, can be used for plastic film, Die molding materials, injection molding materials, such as whitening |
2,5-thiophenedicarboxylic acid - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 29349990 |
| Hazard Class | IRRITANT |
2,5-thiophenedicarboxylic acid - Upstream Downstream Industry
| Raw Materials | Adipic acid Sodium sulfide Sodium sulfide Chlorobenzene |
2,5-thiophenedicarboxylic acid - Introduction
Sublimation at 150-300 ℃. Slightly soluble in water.
Last Update：2022-10-16 17:25:12
2,5-thiophenedicarboxylic acid - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | this product is condensed with o-aminophenol to prepare fluorescent whitening agent EBF. This whitening agent can be used in nylon, polyester, polypropylene, chlorine and triacetic acid fiber, is a product with excellent performance. mainly used for preparing fluorescent whitening agent mainly used for whitening synthetic fiber, EVA, PVC, plastic and rubber, and can be used for whitening plastic film, compression molding material, injection molding material, etc |
| Production method | Mix adipic acid and thionyl chloride in a weight ratio of 1 :( 6-10), and reflux in the presence of catalyst pyridine for 20-60h. The solvent was distilled and the residue was heated at 140-160 ℃ for 3-7h. After sodium hydroxide treatment, acid precipitation, filtration, decolorization, purification, thiophene-2, 5-dicarboxylic acid. |
Last Update：2024-04-10 22:29:15
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Raw Materials for 2,5-thiophenedicarboxylic acid