FIELD: chemistry.
SUBSTANCE: invention relates to chemistry and can be used to produce sulphuric acid. Gas containing SO2 is passed through at least one contact step in a converter until SO3 is obtained. The obtained process gas is tapped from the converter and fed into a heat recuperation apparatus. Water which is first dearated in a deaerator, preferably at feed temperature of 20-90°C is fed into the hear recuperation apparatus. Water vapour is formed from the feed water owing to heat of the process gas. The process gas is fed into an absorber where SO3 is absorbed by sulphuric acid. Temperature of the feed water fed into the heat recuperation apparatus during production of water vapour is higher than temperature of the process gas coming into the absorber.
EFFECT: invention improves utilisation of heat during production of sulphuric acid.
23 cl, 14 dwg, 8 tbl, 14 ex
