[en] Absorption of low temperature steam in the acid concentrate raises the temperature of diluted acid stream. Heat pump based on this principle, called as acid absorption chemical heat pump (AACHP) is coupled with high energy demanding separation unit like distillation column to reduce the heat requirements. This article highlights the advantages of employing AACHPs. AACHP eliminates the need for sophisticated compressors. AACHP based on acid-water system is described. About 95% of supplied heat to the distillation unit is wasted through the cooling water to the environment, but net saving in heat is found to be approximately 40% if a distillation column is coupled with AACHP.(M.G.B.)