| http://www.w3.org/ns/prov#value | - More preferably the reaction vessel is operated at a pressure between about 2000 kPa and about 4000 kPa absolute total pressure. [0039] A high degree of turbulence is created in the reaction vessel by a mixing means, for example by using a venturi mixer, an impeller, or a pair of impellers, which is or are preferably mounted on the axis of the reactor.
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