2-chloro-1,3-butadiene
2-chloro-1,3-butadiene
CAS: 126-99-8
Molecular Formula: C4H5Cl
2-chloro-1,3-butadiene - Names and Identifiers
2-chloro-1,3-butadiene - Physico-chemical Properties
| Molecular Formula | C4H5Cl |
| Molar Mass | 88.54 |
| Density | 0,958 g/cm3 |
| Melting Point | -130°C |
| Boling Point | 59.45°C |
| Flash Point | 11 °C |
| Vapor Presure | 118 at 10 °C, 200 at 20 °C, 275 at 30 °C (quoted, Verschueren, 1983) |
| Refractive Index | 1.4583 |
| Physical and Chemical Properties | Chemical properties colorless flammable liquid, volatile. Boiling point 59.4 ℃,6.4 ℃(13.3kPa),47 ℃(66.5kPa), melting point -130 ℃ 2 ℃, relative density 0.9583(20/4 ℃), flash point (open cup)-20 ℃, refractive index 1.4585. It forms an explosive mixture with air, and the explosion limit is 2.5%-12% (volume). Soluble in ethanol and benzene, slightly soluble in water. With a pungent smell. Addition and polymerization reactions can occur. |
| Use | Use of a monomer for the manufacture of chloroprene rubber. |
2-chloro-1,3-butadiene - Risk and Safety
| Risk Codes | R10 - Flammable R20/22 - Harmful by inhalation and if swallowed. R36 - Irritating to the eyes R48/20 - R36/37/38 - Irritating to eyes, respiratory system and skin. R11 - Highly Flammable R45 - May cause cancer R39/23/24/25 - R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. |
| Safety Description | S16 - Keep away from sources of ignition. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S53 - Avoid exposure - obtain special instructions before use. S36/37 - Wear suitable protective clothing and gloves. S7 - Keep container tightly closed. |
| UN IDs | 1993 |
2-chloro-1,3-butadiene - Upstream Downstream Industry
2-chloro-1,3-butadiene - Nature
| storage conditions | 2-8°C |
| solubility | Soluble in acetone, benzene, and ether (Weast, 1986) |
| morphology | Colorless liquid |
| Henry's Law Constant | 3.20 x 10-2 atm?m3/mol using method of Hine and Mookerjee (1975) |
| exposure limit | Potential occupational carcinogen. NIOSH REL: 15-min ceiling 1 ppm (3.6 mg/m3), IDLH 300 ppm; OSHA PEL: TWA 25 ppm (90 mg/m3); ACGIH TLV: TWA 10 ppm (adopted). |
| (IARC) Carcinogen Classification | 2B (Vol. Sup 7, 71) 1999 |
| EPA chemical information | Chloroprene (126-99-8) |
Last Update：2024-04-10 22:29:15
2-chloro-1,3-butadiene - Uses and synthesis methods
introduction
2-Chloro-1, 3-butadiene is a hydrocarbon organic matter and can be used as a monomer for making neoprene.
production method
(1) Vinyl acetylene obtained by dimerization of acetylene is obtained by adding hydrogen chloride. The production of 1t chloroprene consumes about 750kg of vinyl acetylene and 500kg of hydrogen chloride. (2) Dichlorobutene is obtained by chlorination of butadiene and dehydrochlorination: The dichlorobutene obtained by chlorination of butadiene is a mixture of 3, 4-dichlorobutene-1 and 1, 4-dichlorobutene-2. Since the preparation of chloroprene requires 3, 4-dichlorobutene-2, the 1,4-isomer needs to be converted into 3,4-isomer. The method is to distill the mixture in the presence of cuprous chloride at 130-145°C to convert the 1,4-isomer into a lower boiling point 3,4-isomer (from the top of the tower It can be used for dehydrochlorination to make chloroprene). 1, 4-dichlorobutene-2 is dehydrochlorinated with dilute alkali at 85°C to form 2-chloroprene.
category
flammable liquids
toxicity classification
High toxicity
acute toxicity
oral-rat LD50: 450 mg/kg; oral-mouse LD50: 146 mg/kg
explosive hazard characteristics
Blowable with air
flammability hazard characteristics
It is flammable in case of open flame, high temperature and oxidant; it decomposes toxic hydrogen chloride gas when heated
storage and transportation features
The warehouse is ventilated and dry at low temperature; it is stored separately from oxidants and acids; it is not suitable for long-term storage to prevent polymerization
fire extinguishing agent
Dry powder, dry sand, carbon dioxide, foam, 1211 fire extinguishing agent
occupational standards
TWA 35 mg/m3; STEL 3.6 mg/m3
Last Update：2024-04-10 22:29:15
2-chloro-1,3-butadiene - Security information
| WGK Germany | 3 |
| HazardClass | 3.1 |
| PackingGroup | I |
| toxic substance data | 126-99-8(Hazardous Substances Data) |
| Toxicity | Acute oral LD50 for mice 260 mg/kg, rats 900 mg/kg (quoted, RTECS, 1985). |
| immediate threat to life and health concentration | 300 ppm |
Last Update：2024-04-10 22:29:15
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Product Name: 2-chloro-1,3-butadiene Request for quotationCAS: 126-99-8
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Raw Materials for 2-chloro-1,3-butadiene
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