We are using light isomerate (c5/c6) for regeneration of Feed Dryers in Msqu Unit
As moisture is poison for isomeraisation catalyst so why is steam used for heating isomerate initially in vaporiser (shell side-naptha, tube side --steam) from 50 dgec to 147 degc (heating to the boiling point of isomerate)?
Then superheater is used for heating isomerate outlet temp. from 147degc to 320 degc. @ 60 degc /hr
1. If vaporiser tube punctured/ leaks then there may be chances of going steam into isomerate. Is process disturbed and will it poison the catalyst? (steam pressure~ 8.5 ksc while isomerate press.~9.0)
2. Why can't we use superheater initially from 50 degc to 320 degc? Is there any problem of heating liquid isomerate or it can lead to coke?
3. Is superheater used for only vapor phase not liquid phase?