1.In P & ID the process vapors shown in shell side but it should be in tube side.
2.Both Column C01 & C02 Bottom & Vapor-Liquid separator bottom  streams are connected in same tank i.e.R2 Whether it is at barometric leg?
3.The capacity of R2 is 12.5 M3 on what basis ? (We think the capacity is too higher) please clarify.
4.All other suggestions  are acceptable
 