Union Catalogue of Agricultural Libraries in the Netherlands
The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.
Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.
The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.
As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".
All titles are entered in their original language. Keywords are added to facilitate subject searching.
The database is updated every day and now contains over 830.000 records.
The effect of composition on plate efficiencies for binary mixtures of ethanol and water, n-heptane and methylcyclohexane, and methylcyclohexane and toluene was studied experimentally in an adiabatic distillation column of 3.8 cm internal diameter containing 9 sieve plates. Accurate data concerning the vapour-liquid equilibrium curves were required for the calculation of Murphree plate and point efficiencies. This led to the use of the test for internal consistency of vapour-liquid equilibrium data as introduced by Harington, which was extended to P constant, T variable and corrected for differences from an ideal gas of the vapour phase. An exact graphic method to evaluate the vapour-liquid equilibrium from boiling point composition data of binary mixtures was derived.The observed point efficiencies on overall gas basis seemed to vary markedly with composition in low and high concentrations. It was demonstrated that these variations could not be attributed to lack of precision in the equiibrium data, interference with the column operation by sampling, variation in physical properties with composition, or a variation in stripping or rectifying factor mV/L with concentration.The point efficiencies at total reflux seemed to be a function of the corresponding driving forces for mass transfer in the gas phase.
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