1,3-Cyclooctadiene (stabilized with TBC)
1,3-CYCLOOCTADIENE
CAS: 1700-10-3
Molecular Formula: C8H12
1,3-Cyclooctadiene (stabilized with TBC) - Names and Identifiers
| Name | 1,3-CYCLOOCTADIENE |
| Synonyms | Nsc105773 1,3-CYCLOOCTADIENE cycloocta-1,3-diene 1,3-Cyclooctadiene (stabilized with TBC) |
| CAS | 1700-10-3 |
| EINECS | 216-929-1 |
| InChIKey | RRKODOZNUZCUBN-CCAGOZQPSA-N |
1,3-Cyclooctadiene (stabilized with TBC) - Physico-chemical Properties
| Molecular Formula | C8H12 |
| Molar Mass | 108.18 |
| Density | 0.873g/mLat 20°C(lit.) |
| Melting Point | −53-−51°C(lit.) |
| Boling Point | 55°C34mm Hg(lit.) |
| Flash Point | 76°F |
| BRN | 2321915 |
| Storage Condition | 2-8°C |
| Refractive Index | n20/D 1.494 |
1,3-Cyclooctadiene (stabilized with TBC) - Risk and Safety
| Risk Codes | R10 - Flammable R36/38 - Irritating to eyes and skin. R65 - Harmful: May cause lung damage if swallowed |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S62 - If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. S36 - Wear suitable protective clothing. |
| UN IDs | UN 2520 3/PG 3 |
| WGK Germany | 3 |
| TSCA | Yes |
| Hazard Class | 3 |
| Packing Group | III |
1,3-Cyclooctadiene (stabilized with TBC) - Reference Information
| Application | Cyclooctadiene is an important organic synthesis intermediate, mainly used to prepare octanedioic acid, octanedioic acid, tetrachlorocyclooctane, is also a monomer of polyamide fiber and a reactive diluent of epoxy resin. |
| use | cyclooctadiene is mainly used to produce nylon 8 octanedioic acid, octanedioic acid, low temperature resistant plasticizer, polyamide fiber monomer, engineering plastic, active diluent of epoxy resin, third monomer of ethylene propylene rubber, olefin inhibitor, etc. |
| preparation | (1) vacuumizing the catalyst configuration kettle, vacuumizing the toluene in the solvent metering kettle into the catalyst configuration kettle, and controlling the moisture content <350ppm. (2) vacuum to -0.09mpa, nitrogen gas is broken and replaced, repeated for 3 times. after replacement, a small amount of nitrogen flow is maintained in the system, 3kg of ethanol is added into the charging ball valve, the charging valve is closed, the catalyst is equipped with a kettle to open low-temperature water and stir. (3) 28kg(35L)30% triethyl aluminum in the metering tank is slowly added into the catalyst configuration kettle (batch addition, usually three times), the reaction temperature is controlled below 35 ℃, the temperature and pressure changes are observed when 30% triethyl aluminum is added dropwise, when the pressure exceeds 0.02MPa, the pressure relief valve on the catalyst configuration kettle is slowly opened to relieve pressure, and the dropwise triethyl aluminum is stopped when the temperature reaches 30 ℃. (4) after dropping 30% triethyl aluminum, stir for 10 minutes and stop stirring. under the protection of nitrogen, slowly add the mixed solution of 9kgP catalyst, 1.5kgN catalyst and 10kg toluene (solvent) into the catalyst configuration kettle. after adding, stir, pay attention to the temperature and pressure change (perform the pressure relief operation in step 3) and stir for 20 minutes. (5) put the catalyst configured in the catalyst configuration kettle into the reaction kettle. (6) pump 1500kg of butadiene into the butadiene drop tank twice. (7) turn on the shielded pump to play the cycle (400L toluene is injected into the reaction kettle to ensure the material can be circulated in the system during the first reaction feeding). (8) butadiene is added to the reaction kettle (150Kg butadiene is added each time in the first four batches). (9) slowly raise the temperature to 85 ℃, the reaction exotherms, adjust the temperature of circulating water in the column reactor according to the degree of exotherm, and control the reaction temperature to <110 ℃ (strictly controlled). when the reaction pressure drops below 0.2MPa (strictly controlled pressure), butadiene can be added dropwise intermittently, and the amount of addition is controlled to 150kg or 180kg each time. (10) when the total amount of butadiene added is 1500kg, stop adding butadiene, ensure the reaction temperature is 108±2 ℃, keep the temperature for 3 hours, take samples and analyze, at the end of the reaction, turn on the cooling water to 40 ℃, and prepare discharge when the pressure is 0.1MPa. analysis results: the content of 1,5-cyclooctadiene in the reaction solution is 84.2%, the content of 4-vinylcyclohexene (VCH) is 11.3%, and the content of trimer is 4.5%. The conversion rate of butadiene was 95.3%. |
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Last Update：2024-04-09 20:52:54
