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Hot gases containing ash and char which pass through an undesirable viscous, sticky phase on cooling through an intermediate temperature range, are cooled in a first cooling zone including a falling film of cooling liquid and a spray of cooling liquid followed by contact with a body of cooling liqui

Hot gases containing ash and char which pass through an undesirable viscous, sticky phase on cooling through an intermediate temperature range, are cooled in a first cooling zone including a falling film of cooling liquid and a spray of cooling liquid followed by contact with a body of cooling liquid and subsequent mixing therewith.

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A synthesis gas generation apparatus including a vertically extending synthesis gas generator having a lower outlet through which hot synthesis gas is withdrawn; means defining a vertically extending quench chamber, below said vertically extending synthesis gas generator, having a hot synthesis gas

A synthesis gas generation apparatus including a vertically extending synthesis gas generator having a lower outlet through which hot synthesis gas is withdrawn; means defining a vertically extending quench chamber, below said vertically extending synthesis gas generator, having a hot synthesis gas inlet therein joining said lower outlet of said synthesis gas generator whereby hot synthesis gas exits said synthesis gas generator and is admitted to said quench chamber, and an exit conduit at the upper portion of said quench chamber, said quench chamber containing a body of cooling liquid in the lower portion thereof; an attenuated vertically extending dip tube in said quench chamber having a vertically extending axis, inner and outer perimetric surfaces, and an upper inlet through which hot synthesis gas entering said quench chamber is admitted to said dip tube, through which said gas moves toward a lower outlet end of said dip tube located within said body of liquid; a quench ring adjacent to the inner perimetric surface at the inlet end of said dip tube, said quench ring having a liquid-inlet; a liquid outlet on said quench ring for directing a curtain of liquid along the inner perimetric surface of said attenuated dip tube and toward the outlet end of said dip tube; spray means in said quench ring for directing a stream of liquid away from the inner perimetric surface of said attenuated vertically extending dip tube and toward the axis of said dip tube; and said quench chamber surrounding said attenuated vertically extending dip tube forming a closed chamber therearound providing an annular passageway therebetween, and said exit conduit comprising a quenched gas outlet adjacent to the inlet end of said attentuated dip tube, and a quench bottoms liquid outlet in said quench chamber adjacent to the outlet end of said dip tube; whereby charge gas admitted to the inlet end of said attenuated vertically extending dip tube is contacted with liquid from said liquid outlet on said quench ring and said spray means, as the charge gas passes downwardly along the axis of said attenuated dip tube, and thereafter into a body of liquid maintained in said quench chamber, said charge gas leaving said dip tube, passing through the annular passageway between the outside of the outer perimetric surface of the dip tube and the inside of the inner perimetric surface of the quench chamber, and thence to the quench gas outlet of said quench chamber.