as in example 1 except that the temperature was varied table i______________________________________run number 1 2 3 4______________________________________nominal zinc 12 12 12 12dust particlesize microns molar ratio of zinc pcp h sub 2 o 1 1 15 1 1 15 1 1 15 1 1 15reaction temperature u00b0 c 100 115 130 144reaction pressure psig 0 11 25 45reaction time hr 1 8 1 7 1 9 1 9pcp conversion 21 55 65 73selectivity to cl sub 4 pyr 97 6 98 0 92 9 94 7 mole ______________________________________ table ii shows run numbers 5 8 corresponding to examples 7 10 to show the effect primarily of employing a zinc dust with a nominal particle size of 7 u03bc table ii______________________________________run number 5 6 7 8______________________________________nominal zinc 7 7 7 7dust particlesize microns molar ratio of zinc pcp h sub 2 o 1 1 15reaction temperature u00b0 c 100 115 130 144reaction pressure psig 0 11 25 45reaction time hr 0 59 0 54 0 58 0 55pcp conversion 16 35 64 75selectivity to cl sub 4 pyr 95 6 95 6 95 3 94 5 mole ______________________________________ table iii shows run numbers 9 13 corresponding to examples 11 15 to show the effect primarily of varying the reaction temperature table iii______________________________________run number 9 10 11 12 13______________________________________nominal zinc 12 12 12 12 12dust particlesize microns molar ratio of zinc pcp h sub 2 o 1 1 15reaction temperature u00b0 c 90 100 115 130 145reaction pressure psig 0 0 11 25 44reaction time hr 48 20 5 3 2pcp conversion 72 79 83 77 78zinc conversion 97 89 94 92 96selectivity mole to cl sub 4 pyr 97 5 97 8 97.