Patent ID: 6722130
Filing Date: 2004-04-20
Classification: D21C

Abstract:
A method of producing a process steam, comprising:(a) providing a first black liquor derived in connection with a production of paper pulp; (b) evaporating the first black liquor in a first evaporation step to produce a second black liquor and a first steam, the second black liquor having a second concentration being greater than a first concentration of the first black liquor, the first steam comprising non-condensable gases and turpentine; (c) partly condensing the first steam in a first condensing step to produce a low concentration first condensate; (d) indirectly heating the first condensate by the first black liquor; and (e) evaporating the heated first condensate in a second evaporation step to produce a process steam, the process steam being substantially free from non-condensable gases.