In the manufacture of aniline, liquid nitrobenzene at 20 ŽC is fed to a vaporiser where it is vaporised in a stream of hydrogen. The hydrogen stream is at 30 ŽC, and the vaporiser operates at 20 bar. For feed-rates of 2500 kg/h nitrobenzene and 366 kg/h hydrogen, estimate the heat input required. The nitrobenzene vapour is not superheated