Patent ID: 6027609
Filing Date: 2000-02-22
Classification: D21C,Y02P

Abstract:
A pulp-mill recovery installation for producing liquors containing different concentrations of recovered process chemicals or combustion gasses containing different concentrations of process chemicals from a spent liquor obtained from the production of pulp, said installation comprising:a first gasification reactor for gasifying a portion of a spent liquor and producing a first combustion gas and a first smelt;a first quench vessel connected to said first reactor, said first quench vessel being constructed and arranged to provide contact between a cooling liquid and said first smelt to form a first liquor;a second gasification reactor for gasifying a portion of a spent liquor and producing a second combustion gas and a second smelt;a second quench vessel connected to said second reactor, said second quench vessel being constructed and arranged to provide contact between a cooling liquid and said second smelt to form a second liquor;an apparatus for recovering at least one process chemical from at least one of said first or second combustion gasses or said first or second liquors, said apparatus for recovering being constructed and arranged to supply said recovered process chemical to at least one of following:(i) a reactor different from the reactor that produced the combustion gas or liquor from which said process chemical was recovered;(ii) the same reactor that produced the combustion gas or liquor from which said process chemical was recovered;(iii) an apparatus for processing a liquor produced by a reactor different from the reactor that produced the combustion gas or liquor from which said process chemical was recovered;(iv) an apparatus for processing a combustion gas produced by a reactor different from the reactor that produced the combustion gas or liquor from which said process chemical was recovered; or(v) a liquor or combustion gas produced by a reactor different from the reactor that produced the combustion gas or liquor from which said process chemical was recovered, wherein said first quench vessel comprises a dip-tube connected to said first reactor that opens above the surface of a pool of liquid in said first quench vessel comprising said first liquor, wherein said first combustion gas flows down through said dip-tube and then over said pool of liquid.