To solve the problem of high consumption and great emission of the evaporation unit in production of a vitamin

an advanced process is proposed based on the self-heat recuperation technology. The sensible and latent heat of the effluent stream is recuperated and reused to heat the inlet stream of flash evaporator by vapor recompression without any heat addition. The advanced process is evaluated by energy and exergy analysis. The relation between energy consumption and the minimum heat transfer temperature difference are studied

as well as the effect of adiabatic efficiency on energy required. The results indicate that the advanced system with self-heat recuperation technology is able to save great energy and exergy. The energy input is decreased by 73.0% and the exergy input is decreased by 68.3%. There is a larger potential space for latent heat than sensible heat

which only accounts for 6.5% of the total heat recycled. Although larger minimum temperature difference needs less heat transfer area

it requires more energy input. Higher adiabatic efficiency and lower superheat mean less energy required.