Treatment with gas, especially oxygen gas

Details Treatment with gas, especially oxygen gas Treatment with gas, especially oxygen gas

D - Textiles, Paper

21

C

92/60.1, 8/78.1

D21C 9/10 (2006.01) B01F 13/02 (2006.01)

Patent

CA 1038108

Abstract of the Disclosure A method and an apparatus is provided for treating cooked fiber pulp at a concentration of 5 to 20% in a reactor vessel with oxygen gas or oxygen containing gases. After being thoroughly mixed with the gas, the pulp is fed into a bottom part of the reactor vessel and into a centrally- located, funnel-shaped body through which the pulp flows upwards. This body has a top end which is open and located in a gas chamber. The pulp is scraped over the top edge of the central body so that it falls in a cascading manner to a lower pulp level in an annular chamber formed between the central body and the outer reactor vessel. The pulp then moves downwards to the bottom of the annular chamber where it is drawn off through an outlet. Sur- plus gas is taken from the gas chamber and recirculated and emulsified with the pulp being fed into the central body. Thus unconsumed gas is returned to the gas chamber with the incoming pulp. Only an insignificant quantity of the gas is dissolved in the liquid pulp in the annular chamber.

207811

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