Methyl-dichloro-phosphine prepn. - from methane and phosphorus trichloride with carbon tetrachloride as initiator

摘要

Methyldichlorophosphine (I) is prepd. by the reaction of methane with PCl3 in the presence of CCl4 at 500 degrees C. 2-7 pref. 3-5 mole % (w.r.t. PCl3) CCl4 is used as reaction initiator. The CCl4 reacts to a degree of 50-80% by variation of the reaction temp. between 550-650 degrees C for constant contact times of 0.1-0.9 pref. 0.3-0.8 s, and the reaction mixt. still contg. 20-50 % CCl4 used is eliminated by condensation. The process gives (I), used in fire-proofing compsns. for fibres and plastic minerals, with good yields and satisfactory rates of conversion.