(under subclass 233) Apparatus provided with means to salvage or make available for reuse heat and/or products resulting from the digestion process.
(1) Note. In this subclass may be found, for example, apparatus in which materials salvaged include chemicals used to liberate or free the fibrous materials, or in which means are provided to utilize excess thermal energy that would otherwise be lost in the digestion process.
(2) Note. Mere recirculation of digestion materials through the same batch of material to be treated is not classified in the indented subclasses. For such subject matter search subclass 248 below. Also, the recovery of used liquor or heat by passing it directly into another digester containing chips to be digested is not included here. For such subject matter see subclass 241 below and the Notes thereto.
SEE OR SEARCH THIS CLASS, SUBCLASS:
29, for processes including a step of recovering the digestion fluid, and subclass 47 for digestion processes including a heat recovery step.
