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Extra resources for Houben-Weyl Methoden der organischen Chemie vol.E12b Organotellurium Compounds
Due to the porous s t r u c t u r e of the c o a l samples not a l l the imbibed s w e l l i n g agent c o n t r i b u t e d to the c o a l s w e l l i n g . A c o n s i d e r a b l e p o r t i o n of t h i s solvent American Chemical Society Library 1155 16th St. N. w. ; ACS Symposium Series; Washington, American 0. Chemical C. Society: 2 0 0 3 6 Washington, DC, 1981. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1981. 89 57 50 25 20-30 30-40 30-40 57 57 50 25 20-30 30-40 30-40 20-30 57 50 25 20-30 30-40 30-40 57 50 25 57 50 25 20-30 30-40 30-40 20-30 30-40 30-40 57 50 25 20-30 30-40 30-40 Only the 20-30 mesh c o a l s were e x t r a c t e d before s w e l l i n g .
Sample Separation and C h a r a c t e r i z a t i o n . Three v i t r i n i t e samples ( S i l k s t o n e , High Hazels, and W e s t f i e l d ) were obtained by hand-picking of macroscopic v i t r a i n bands i n Carboniferous c o a l s . Selected v i t r a i n p a r t i c l e s were crushed to pass a B. S. 100 mesh s i e v e (250 μ) and p o l i s h e d mounts were prepared. Sample p u r i t y was determined by p o i n t - c o u n t i n g (sample r e f l e c t i v i t y ) 500 p o i n t s , g i v i n g a ± 2% (by volume) accuracy (18).
Ch003 V K m/p+m/p c c s s K ' K Here m, ρ and V denote weight, d e n s i t y and volume o f the two com ponents, i . e . c o a l and s w e l l i n g agent, which are designated by the s u b s c r i p t s c and s r e s p e c t i v e l y ; then V designates the volume o f the swollen c o a l . An apparent volume degree o f s w e l l i n g , Q pp, can a l s o be determined from equation (6). g a Q = 1/U app 2,app (6) 0 x Accurate determination of the c o a l volume f r a c t i o n i n the swollen c o a l p a r t i c l e s can be done by c a l c u l a t i n g and excluding the pore volume, Vp, occupied by the solvent during s w e l l i n g .