Abstract: There is provided a process for treating an aqueous liquid mixture comprising: effecting separation, based on density differences, from an aqueous liquid mixture, of at least a fraction of organic liquid material of the aqueous liquid material such that an organic liquid material-enriched phase becomes disposed above an organic liquid material-depleted phase; and contacting the organic liquid material-enriched phase with reagent material within a reaction zone and in sufficient proximity to a solid catalyst material such that a reactive process, effected by the contacting, and catalyzed by the solid catalyst material, effects production of reaction products. There is also provided an apparatus for implementing the above-described process.