1 or 5 1 ratio as the table shows product distribution is surprisingly sensitive to the silica alumina composition even more unexpectedly the optimum for 2 4 6 triisopropylphenol formation is about 1 1 silica alumina with a substantial decrease on either side of the optimum continuous alkylations were performed using a fixed bed of 50 cc catalyst no major differences were observed between upflow and downflow operation and the data below were obtained from a downflow mode it was also found that pressure changes in the range 500 1500 psig had little effect on the results in the accompanying table the propylene to phenol molar ratio was 5 table 2__________________________________________________________________________continous isopropylation of phenol product distributions wt sup b pressure temp time on mono other di other tri run catalyst sup a psig u00b0 c lhsv stream hr phenol alkylate 2 6 alkylate 2 4 6 alkylate__________________________________________________________________________5 3 1 500 250 5 22 6 4 2 16 9 12 2 44 8 17 6 225 44 2 1 6 7 28 7 8 7 41 9 13 1 200 66 3 1 10 1 37 8 7 4 31 7 7 0 250 88 1 0 5 9 22 1 13 4 44 7 11 0 275 114 9 5 8 17 8 18 8 42 6 12 1 300 138 1 1 6 9 11 0 31 3 32 9 14 76 37 63 750 250 5 28 trace 14 6 5 9 59 3 16 9 225 68 5 20 4 5 5 55 2 15 2 250 114 trace 11 9 5 7 59 2 19 77 1 1 500 250.