Pilot-Plant Development of the Sulfate Recycle Nitric Phosphate Process

Abstract

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,

Separation of ammonium phosphate from ammonium nitrate in sulfate recycle nitric phosphate process

“…The gypsum-crystallizer filtrate was obtained from the TVA sulfate recycle process pilot plant (Meline et al, 1971). The filtrate, including cake wash, typically contained (100% basis) about 24% ammonium nitrate, 8.5 % phosphoric acid, 0.28 % R203, and 3 % ammonium sulfate.…”

Manufacture of ammonium sulfate fertilizer from FGD-gypsum. Quarterly report, 1 December 1994--28 February 1995

“…In the ,early 1960's the TVA started working with the Mersberg process as a regeneration step subsequent to the production of ammonium phosphate fertilizers in bench scale (Blouin et al, 1970) and pilot scale (Meline et al, 1971). In the process, phosphate rock is extracted with nitric acid.…”

“…requirement, and the conversion was 98% (Meline et al, 1971). The particle size of the gypsum had an effect on the particle size of the CaC03.…”