摘要:

AbstractChemical flow reactors studied include models in which partial mixing and piston flow are present and others which involve partial mixing and short‐circuit. Mixing levels considered extend all the way between the extreme cases of tubular and continuous‐stirred tank reactors. Various orders of reaction are taken into account.The curves presented, obtained through analytical methods, show either the variation of conversion with mixing level at given values of residence time, or relative residence times for a given conversion. Graphical methods of solution are proposed. They involve, in part, a means of computation whereby the overall conversion for a number of reactors in series is obtained from the individual conversions.While isothermal conditions only have been considered, more interesting results are expected when other conditions are applicable, whether isothermal or

ISSN:0008-4034    

DOI:10.1002/cjce.5450380102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1960

数据来源: WILEY

摘要:

AbstractThere is need of an economical and safe method of disposing of radioactive waste produced by nuclear reactors. A method for the incorporation of fission products into glass is being studied at Chalk River. Class containing up to 50 curies of fission products per kilogram has been made during the investigation of the process. This radioactive glass has been used in stability studies in the laboratory and in the field.Nepheline syenite (a rock containingNa, KandAlsilicates) fluxed with up to 30% by weight of lime, is used as the base for the glass. A nitric acid solution of the fission products is added to a pelletized mixture of the solids. When the mixture is heated nitric acid is evaporated near 110°C. The nitrates are decomposed in the temperature range 130–600°, and the mixture is melted to form a glass at a maximum temperature of 1350°. Two of the fission products, ruthenium and cesium, are volatilized to varying degrees from the mixture during heating and create a major contamination and containment problem.The method of processing and results obtained are discussed. The volatilized elements have been removed from the off‐gas stream by a method which permits their incorporation into glass. Scale‐up of the process to treat fission product wastes from power reactors should present no great difficulty other than design of equipment for the remote processing of large quantities of radioactive material at high tem

ISSN:0008-4034    

DOI:10.1002/cjce.5450380103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1960

数据来源: WILEY

摘要:

AbstractA simplified method is proposed which enables the determination of solid diffusion coefficient for systems with non‐linear adsorption isotherm. The method involves the approximation of the concentration history of the liquid phase with polynominal functions and consequently the match of the experimental results and calculated values. Experimental work has given rather satisfactory result

ISSN:0008-4034    

DOI:10.1002/cjce.5450380104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1960

数据来源: WILEY

摘要:

AbstractAfter two years of research and development in the pilot plant stages, a plant for the production of nuclear grade uranium tetrafluoride by the Moving Bed Process has been designed, built, and successfully operated at Eldorado's Port Hope Refinery. This is the only production facility in the world using the moving bed technique for the production ofUF4.An exceptionally high grade uranium tetrafluoride, low in unconverted uranium oxides and uranyl fluoride can be obtained. A large percentage of the production exceeds 99% uranium tetrafluoride. Total metal contamination is less than 150 ppm.

ISSN:0008-4034    

DOI:10.1002/cjce.5450380105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1960

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450380106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1960

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450380101

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1960

数据来源: WILEY