water occurred thereafter with the lead bath temperature having dropped to 290 u00b0 c the temperature of the phosphorus rose to 280 u00b0 c at which temperature the bulk of the conversion of yellow phosphorus to red phosphorus and evaporation of yellow phosphorus occurred upon completion of the conversion the lead bath temperature was raised to 330 u00b0 c to effect further distillation of unconverted yellow phosphorus the skip thereafter was removed from the reactor and air and water cooled to ambient temperature the temperature time profile is reproduced in the following table i table i______________________________________temperature u00b0 c timeskip lead hrs notes______________________________________ 20 450 0100 400 0 5 evaporation of water commenced100 350 2110 350 3 5 evaporation of water ceased280 290 7 rap conversion commenced280 290 13 rap conversion ceased330 330 19 residual p sub 4 distillation commenced330 330 24 residual p sub 4 distillation ceased 20 30______________________________________ the red amorphous product obtained was a reddish colour porous and easily fractured and occupied a depth of 71 2 inches in the skip indicating a bulk density of 1 014 g cc 1550 kg of red amorphous phosphorus was obtained corresponding to 36 5 wt of the initial charge 2550.