2.3-DiMethylph
2,3-Dimethylphenol
CAS: 526-75-0
Molecular Formula: C8H10O
2.3-DiMethylph - Names and Identifiers
| Name | 2,3-Dimethylphenol |
| Synonyms | 2,3-Xylenol 2,3-XYLENOL VIC-O-XYLENOL 2.3-DiMethylph 2,3-Dimethylphenol 2,3-DIMETHYLPHENOL 3-HYDROXYL-O-XYLENE 2,3-DiMethylphenol solution 1-Hydroxy-2,3-dimethylbenzene 2,3-Xylenol, 3-Hydroxy-m-xylene |
| CAS | 526-75-0 |
| EINECS | 208-395-3 |
| InChI | InChI: 1S/C8H10O/c1-6-4-3-5-8(9)7(6)2/h3-5,9H,1-2H3 |
2.3-DiMethylph - Physico-chemical Properties
| Molecular Formula | C8H10O |
| Molar Mass | 122.16 |
| Density | 1.02~1.03 |
| Melting Point | 70-73°C(lit.) |
| Boling Point | 217°C(lit.) |
| Flash Point | 95 °C |
| Water Solubility | slightly soluble |
| Vapor Presure | 59.995kPa at 25℃ |
| Vapor Density | 4.23 (vs air) |
| Appearance | powder to crystal |
| Color | White to Orange to Green |
| Exposure Limit | ACGIH: TWA 1 ppm |
| Merck | 14,10082 |
| BRN | 1906267 |
| pKa | pK1:10.50 (25°C) |
| Storage Condition | room temp |
| Refractive Index | 1.5420 |
| Physical and Chemical Properties | White crystals. Slightly soluble in water, soluble in most organic solvents and alkali solution. |
2.3-DiMethylph - Risk and Safety
| Risk Codes | R24/25 - R34 - Causes burns R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 2261 6.1/PG 2 |
| WGK Germany | 3 |
| RTECS | ZE5500000 |
| TSCA | Yes |
| HS Code | 29071990 |
| Hazard Class | 6.1 |
| Packing Group | II |
2.3-DiMethylph - Reference Information
| LogP | 2.115 at 25℃ |
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | 2,3-dimethylphenol is also called 2,3-dimethylphenol, 2,3-dimethylphenol is mainly used to make phenolic resins, plasticizers, dyes, flotation agents, pesticides, fungicides, mold adhesives, wood preservatives, antioxidants, lubricating oil additives, etc., can also be used as intermediates in other organic synthesis, and high purity 2, 3-Dimethylphenol is mainly used as an intermediate in electronic materials. |
| preparation | 2, 3-dimethylaniline is used as raw material, and 2, 3-dimethylphenol is synthesized by diazotization and hydrolysis in one step, pickling, neutralization and water washing, distillation, rectification and wastewater treatment. 1. One-step synthesis of 2, 3-dimethylphenol crude product by diazotization and hydrolysis. Water, concentrated sulfuric acid, 2, 3-dimethylaniline, quaternary ammonium salt catalyst, recovered methyl isobutyl ketone and fresh methyl isobutyl ketone are added to the enamel reactor, a certain stirring speed is controlled, and a certain temperature is maintained to start dropping sodium nitrite aqueous solution. After adding a quantitative sodium nitrite aqueous solution, after 1h of heat preservation reaction, stop stirring and settling for 1h. The nitrogen oxide exhaust gas produced in the reaction process is discharged up to the standard after being treated by the alkali liquor absorption tower. Pickling and neutralization water washing: divide the waste acid in the lower layer into the waste acid kettle, add quantitative water and a small amount of sulfuric acid into the reaction kettle, keep the temperature of the kettle at 60~65 ℃, stir for 0.5h, and then settle for 3h. The pH value of the water layer is determined to be lower than 3.5. If it is higher than 3.5, sulfuric acid is added and stirred and settled again. The pH value of the water layer is qualified, and the lower acidic wastewater is separated into the waste acid kettle. The quantitative water is added to the reaction kettle again, and then the pH value of the neutralized water layer is 6.5~7.0 with sodium carbonate solution. Keep the temperature of the kettle at 50~60 ℃ and settle for 1h, then separate the lower wastewater into the waste acid kettle. The upper organic layer is transferred to the distillation kettle. 2. Distillation is carried out in a distillation kettle, keeping the negative pressure state at -0.07MPa, decompressed distillation is carried out by steam heating, about half of the solvent methyl isobutyl ketone and a small part of water are distilled, and the temperature of the distillation kettle is raised to 115 ℃ to stop distillation. The evaporated material is received by the circulating water condenser to the solvent receiving tank and used as the recovery solvent for the next batch of reactions. After the distillation kettle is repressed with nitrogen, the temperature of the distillation kettle is reduced to below 50 ℃, and the 2, 3-dimethylphenol crude material containing solvent in the distillation kettle is transferred to the rectification kettle. 3. Distillation is carried out in a distillation kettle with a negative pressure of-0.082MPa, and vacuum distillation is carried out with steam heating. The solvent in the material is steamed out and used as a recovery solvent for the next batch of reactions. The initial fraction is directly put into the next batch of rectification, and finally the finished product 2, 3-dimethylphenol is obtained. |
| use | used as raw materials for disinfectants, plasticizers and pesticides, used for extracting 3, 5-xylenol, 3, 4-xylenol, etc. used in organic synthesis. can be used as a raw material for disinfectants, plasticizers and pesticides |
| production method | is obtained by diazotization and hydrolysis of 2, 3-xylaniline. |
| category | toxic substances |
| toxicity classification | poisoning |
| acute toxicity | inhalation-rat LC: 85.5 mg/m3/4 hours; Intravenous injection-mouse LD50: 56 mg/kg |
| flammability hazard characteristics | combustible, decomposition of toxic chloride gas during combustion |
| storage and transportation characteristics | warehouse ventilation and low temperature drying; Separate storage and transportation from food raw materials, alkalis and oxidants |
| fire extinguishing agent | carbon dioxide, foam, dry powder |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 02:00:05
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