Sulfur-Coated Urea from a 1-Ton-Per-Hour Pilot Plant

Shirley, A. R.; Meline, R. S.

doi:10.1021/ba-1975-0140.ch003

Cited by 12 publications

(8 citation statements)

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“…Developed by the Tennessee Valley Authority (TVA), SCU was first produced by spraying molten sulfur (S) onto urea particles, and then adding a light coat of molten wax that also contained a microbicide. In later work, it was noted that use of the microbicide was often discontinued (Shirley and Meline, 1975). N release from SCU is affected by soil temperature, soil water content, microorganism activity, and coating characteristics (Jarrell and Boersma, 1980).…”

mentioning

confidence: 99%

Slow-release Nitrogen Fertilizers in Vegetable Production: A Review

Guertal¹

2009

hortte

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Slow-release nitrogen (N) fertilizers offer many potential benefits for vegetable production. In sandy soils, their use may lessen N leaching. If the slow-release fertilizer has a release pattern that matches crop needs, N uptake by the growing crop may become more efficient. Additionally, if slow-release fertilizers can be applied as a preplant application, production costs could be lessened, eliminating the need for multiple applications of soluble N fertilizer. Synthetic slow-release fertilizers can be separated into two general groups: those that are slow release as a byproduct of a chemical reaction (such as urea-formaldehyde), and those that are slow release via a sulfur, wax, or resin coating around the fertilizer prill. In vegetable crop research, much of the available literature has focused on use of sulfur coat urea and urea-formaldehyde, as they have been in the fertilizer market for 40 years. Newer research has evaluated resin-coated products. In most studies, use of slow-release N fertilizers as a preplant treatment did not decrease crop yield, but yield was rarely increased when compared with standard split applications of soluble N. Based on available research, the benefits of using slow-release N fertilizers in vegetable crop production will come from reduced environmental risk and savings in production costs.

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Slow-release Nitrogen Fertilizers in Vegetable Production: A Review

Guertal¹

2009

hortte

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“…In that work, a thin coating of sulfur was sprayed hydraulically onto granular urea substrate in a rotary drum (Blouin et al, 1967(Blouin et al, , 1974Engelstad et al, 1972;Shirley et al, 1975;Tennessee Valley Authority, 1978;Myers et al, 1978). A significant discovery was that the coating process was much more uniform and efficient when the substrate was directed into the form of a thin, falling curtain and the sulfur sprays were directed onto this curtain.…”

Section: Introductionmentioning

confidence: 99%

Melt granulation of urea by the falling-curtain process

Shirley¹,

Nunnelly²,

Carney³

1982

Ind. Eng. Chem. Prod. Res. Dev.

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“…The coating of tablets and of the gelatin capsules in the pharmaceutical industry and the coating of nutrients in the food industries are typical examples of application (Dewettinck and Huyghebaert, 1999). Applications of these techniques in agriculture include the coating of seeds (Duarte, 2002;Porter, 1978;Liu and Litster, 1993a,b;Conceição Filho et al, 1997), fertilizers (Donita, 2000;Shirley and Meline, 1975;Weiss and Meisen, 1983;Salman, 1989;Salman et al, 1989) and pesticides (Shasha et al, 1976, Yeom et al, 2002.…”

mentioning

confidence: 99%

Effect of the Equipment Configuration and Operating Conditions on Process Performance and on Physical Characteristics of the Product During Coating in Spouted Bed

Publio¹,

Oliveira²

2004

Can J Chem Eng

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The effects of the configuration and operating conditions on the performance of the spouted bed tablet coating process have been studied. The configuration parameters analyzed were the ratio between the draft tube diameter and the inlet orifice diameter, dT/di, and the conical base angle, γ. To analyze the equipment performance the adhesion coefficient, η, and the increase rate of the tablet mass, K1, were measured as a function of the mass flow rate of the coating material, Ws, of the ratio between the mass feed flow rate of coating suspension relative to mass feed flow rate of the spouting gas, W*s/W*g, of the air flow rate relative to minimum spouting, Q/Qms, and of the feed flow rate of atomising air, Wat. Procedures for the evaluation of the growth kinetics and for measuring the product uniformity are presented.

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Sulfur-Coated Urea from a 1-Ton-Per-Hour Pilot Plant

Cited by 12 publications

References 0 publications

Slow-release Nitrogen Fertilizers in Vegetable Production: A Review

Slow-release Nitrogen Fertilizers in Vegetable Production: A Review

Melt granulation of urea by the falling-curtain process

Effect of the Equipment Configuration and Operating Conditions on Process Performance and on Physical Characteristics of the Product During Coating in Spouted Bed

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