lower condenser outlet temperature reduces pan loss but also reject less water and hence sends more phthalic acid to column 268 cases run without the 7 lb hr free water to the decomposers gave the following results in table 2 below table 2______________________________________ decomposer section condenser condenser condenser outlet at outlet at outlet at 350 u00b0 f 400 u00b0 f 450 u00b0 f ______________________________________phthalic acid to 230 220 210col 268 lb hrvapor loss fromcondenser lb hrwater 2 1 3 4 4 7pan 0 8 3 4 11 2other 4 4 4 3 5 3total 7 3 11 1 21 2______________________________________ table 3______________________________________ finishing section vent send operate vapor vapor conden directly to col at bypass 268 top 400 u00b0 f 4 cond stage______________________________________key rates lb hr 1 to col 268 from 153decomp overheadto vacuum jets 34 153 0from predecomp to vacuum jets 142 142 160from col 268total to vac jets 176 295 160performanceparametersphthalic acid to 209 211 211col 268 lb hr 2 col 268 reflux 0 357 0 359 0 351ratio on feed 3 benzoic acid rejec 84 1 84 3 83 6tion in col 268 5 col 268 top stage 326 u00b0 f 326 u00b0 f 314 u00b0 f temperaturetotal pan losses 59 3 176 2 42 0to vacuum jetslb hrdelta pan losses base 116 9 17 3lb hr______________________________________ notes 1 based on 30 107 lb hr crude feed to the decomposers 2 based on assumption of 337 lb hr phthalic acid and 7 lb hr water to.