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The authors believe they have developed a practicable kinetic model of the propylene-butene codimerization reaction. It is encouraging that the model extrapolates so well to the equilibrated-butene feed cases (only two of the runs used in the model development had butene-2 present in the feed). This model is most useful in "paper" studies and for screening ideas to be tried in the pilot plant. AcknowledgmentThe authors thank P. L. T. Brian of MIT for his stimulating discussions about the statistical nature of this reaction. They also thank D. T. Roberts for making the experimental runs needed for this model development and finally,

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Pilot-plant development of a process for the production of fertilizer from Florida leachedzone ore-a low-grade, high-alumina phosphate ore-is described. The ore was calcined and then extracted with a mixture of nitric and sulfuric acids. After filtration, the extract was processed into fertilizer by continuous ammoniation and granulation. Typical grades of fertilizer that can be made are 15-15-15, 20-20-0, and 11-22-11. The products are well granulated, do not cake in storage, and have a satisfactory agronomic value. The process provides an opportunity for convenient recovery of uranium from ore.