... washing and recrystalliza-tion steps is 92%, estimate the feed flow rates of 1 1-[ N-methyl- 4- piperidylidene ]-8 -chloro-6,11-dihydro-5H-benzo-[5,6]-cyclohepta-[1, 2- b]-pyridine and ethylchloroformate ... of1 1-[ N-methyl-4-piperidylidene ]-8 -chloro-6,11-dihydro-5H-benzo-[5,6 ]- cyclohepta-[1,2-b]-pyridine (C20H21ClN2) in 200 ml of benzene with10.9 g of ethylchloroformate (C3H5ClO2) for ... the thin-film evaporator.iii. How would you recover the product lost in the evaporator?2.10. 1 1-[ N-ethoxycarbonyl-4-piperidylidene ]-8 -chloro-6,11-dihydro-5H-benzo-[5,6]-cyclohepta-[1,2-b]-pyridine...