Technology Unit

In the cracked Gas Drier (molecular sieve) the water content is reduced to the required dew point.
In the cracked Gas Condensate Drier (molecular sieve) the remaining water is removed and the product is fed to the lower section of Deethanizer.
Both drier stations are regenerated automatically.
The cracked Gas Cooler is in operation only during start-up of the plant and in case of naphtha cracking only.

Source: Y.A. Sastry & Uday Krishna Dy, DUAL FEED CRACKER UNIT & ASSOCIATED UNIT, ONGC Petro additions Limited (OPaL), Uploaded on 28^th Jan 2018 on SCRIBD.