Butanes and butenes can be maintained in the liquid states at ambient temperature under quite moderate pressure.
在适当的大气压力及常温下，丁烷和丁烯均可保持液体状态。
2
The butenes are derived from petroleum refinery gases and are used in making butadiene, high-grade gasolines, and as sources of synthetic chemicals.
丁烯是从石油炼厂气衍生而来，用于制造丁二烯、高级汽油和合成化学品。
3
Ten of them were identified. They are ethylene, propylene, isobutane, cyclobutane, three isomeric butenes, methyl ethyl ether, ethyl isopropyl ether, and ethyl acetate.