Lynne Wong's PhD thesis
Lynne Wong's PhD thesis Lynne Wong's PhD thesis
As seen in Section 5.6.4.5, the Hailwood-Horrobin and GAB models describe well the sorption behaviour of reconstituted cane stalk, dry leaf and green leaf. The change of m o values of reconstituted cane stalk and dry and green leaves with temperature as obtained from the GAB, Caurie I and modified BET models is shown in Fig 6.4. Table 6.1. Parameters of the Caurie I and modified BET sorption models, the coefficient of determination R 2 , the mean relative deviation modulus P, and the standard errors of the estimate E s for the isotherms of reconstituted R 570 of two ages and at various temperatures. Reconstituted Model Parameter 52 weeks 36 weeks R 570 30 o C 45 o C 55 o C 60 o C 30 o C 45 o C 55 o C 60 o C Cane stalk Caurie I b 0.1368 0.1551 0.1869 0.1932 0.1405 0.1705 0.1806 0.1792 m o 0.8979 0.8607 0.8769 0.8656 0.9212 0.8869 0.9029 0.9154 R 2 0.9734 0.9767 0.9866 0.9939 0.9628 0.9731 0.9895 0.9747 P 14.01 15.41 8.150 5.748 8.114 9.082 6.873 14.58 E s 2.774 2.923 2.408 2.000 1.046 1.978 1.533 2.622 Modified m o 0.564 0.615 0.632 0.681 0.538 0.589 0.585 0.545 BET b 10000000 9738113 10000000 8725001 20000000 8909343 10000000 20000000 R 2 0.009 0.304 0.602 0.741 0.019 0.411 0.573 0.451 P 42.60 36.05 26.57 24.04 42.26 32.33 28.77 34.50 E s 6.546 6.281 5.245 5.175 6.394 5.784 5.498 8.952 Dry leaf Caurie I b 0.1271 0.1563 0.1700 0.1837 0.1397 0.1536 0.1528 0.1830 m o 0.8635 0.8714 0.8741 0.8435 0.8763 0.8474 0.8695 0.8591 R 2 0.9543 0.9883 0.9809 0.9930 0.9827 0.9670 0.9770 0.9486 P 10.34 7.654 13.41 7.977 7.506 10.51 9.019 21.09 E s 2.386 1.668 3.044 3.765 1.340 1.752 1.964 12.20 Modified m o 0.599 0.614 0.618 0.743 0.602 0.654 0.598 0.774 BET b 8402048 40000000 30000000 20000000 10000000 20000000 10000000 8571450 R 2 - 0.407 0.536 0.801 0.194 0.460 0.339 0.779 P 44.33 35.50 31.60 21.04 40.25 34.38 36.87 26.13 E s 7.705 5.707 5.528 4.105 6.235 5.562 6.346 6.706 Green leaf Caurie I b 0.1450 0.1607 0.1785 0.1753 0.1421 0.1648 0.1711 0.1888 m o 0.8663 0.8447 0.8401 0.8515 0.8910 0.8519 0.8679 0.8078 R 2 0.9637 0.9867 0.9947 0.9903 0.9854 0.9861 0.9871 0.9744 P 12.48 9.387 6.512 6.808 6.691 6.249 10.23 9.299 E s 2.468 2.344 2.418 2.300 1.535 1.625 2.231 7.867 Modified m o 0.604 0.663 0.709 0.689 0.585 0.657 0.631 0.907 BET b 20000000 40000000 20000000 8474309 9600464 30000000 10000000 30000000 R 2 0.159 0.489 0.693 0.696 0.220 0.526 0.559 0.846 P 39.51 33.96 26.96 25.72 40.16 32.54 30.60 25.85 E s 6.592 5.660 4.725 5.501 5.991 5.356 5.326 7.158 Note: m o, b, c and d are constants. 239
Stalk fibre Stalk pith Rind fibre 8 8 8 mo /% db 6 4 2 mo /% db 6 4 2 mo /% db 6 4 2 0 30 40 50 60 Temperature/ o C 0 30 40 50 60 Temperature/ o C 0 30 40 50 60 Temperature/ o C Rind fines Top fibre Dry leaf fibre 8 8 8 mo /% db 6 4 2 mo /% db 6 4 2 mo /% db 6 4 2 0 30 40 50 60 Temperature/ o C 0 30 40 50 60 Temperature/ o C 0 30 40 50 60 Temperature/ o C Dry leaf fines Green leaf fibre Green leaf fines 8 8 8 mo /% db 6 4 2 mo /% db 6 4 2 mo /% db 6 4 2 0 30 40 50 60 Temperature/ o C 0 30 40 50 60 Temperature/ o C 0 30 40 50 60 Temperature/ o C 52 weeks 36 weeks Figure 6.1. Variation of the GAB model monolayer moisture content with temperature for the nine cane components of R 570 aged 52 and 36 weeks. 240
- Page 241 and 242: Table 5.4. Water activity (a w ) of
- Page 243 and 244: 5.6.3 Procedure to determine equili
- Page 245 and 246: 5.6.4 Results and discussion An exa
- Page 247 and 248: Table 5.8. Equilibrium moisture con
- Page 249 and 250: Table 5.10. Equilibrium moisture co
- Page 251 and 252: Table 5.12. Equilibrium moisture co
- Page 253 and 254: 30 o C 45 o C 55 o C 60 o C Water w
- Page 255 and 256: m/m of 96% activity, a w (g/100g dr
- Page 257 and 258: vaporisation generally decreases fr
- Page 259 and 260: 30 o C isotherm 45 o C isotherm 55
- Page 261 and 262: 4 0 Stalk fibre 5 0 Stalk pith 5 0
- Page 263 and 264: 5.6.4.4 Fitting of sorption models
- Page 265 and 266: Table 5.19. Parameters of the sorpt
- Page 267 and 268: Table 5.21. Parameters of the sorpt
- Page 269 and 270: Table 5.23. Parameters of the sorpt
- Page 271 and 272: Table 5.25. Parameters of the sorpt
- Page 273 and 274: Table 5.27. Parameters of the sorpt
- Page 275 and 276: Modified GAB Kuhn Iglesias - Chirif
- Page 277 and 278: Table 5.28. Classification of resid
- Page 279 and 280: Stalk fibre Stalk pith Rind fibre 4
- Page 281 and 282: 5.6.4.5 Calculated EMC values of re
- Page 283 and 284: Table 5.30. Calculated equilibrium
- Page 285 and 286: m/m of 96% Table 5.32. Calculated e
- Page 287 and 288: Table 5.33. Parameters of the Hailw
- Page 289 and 290: CHAPTER 6. PROPERTIES OF THE SORBED
- Page 291: where m is the equilibrium moisture
- Page 295 and 296: Stalk fibre Stalk pith Rind fibre 4
- Page 297 and 298: 6.2 THE NUMBER OF ADSORBED MONOLAYE
- Page 299 and 300: 6.3 TOTAL SOLID SURFACE AREA AVAILA
- Page 301 and 302: Thus, for each cane component of ea
- Page 303 and 304: abscissa. For each moisture level (
- Page 305 and 306: Stalk fibre Stalk pith Rind fibre 1
- Page 307 and 308: A similar procedure was followed to
- Page 309 and 310: 10 0 Stalk fibre Stalk pith Rind fi
- Page 311 and 312: Moreover, if T β > T hm the proces
- Page 313 and 314: Table 6.5. Characteristic parameter
- Page 315 and 316: Binding energy/kJ (kg mol) -1 2 0 0
- Page 317 and 318: 6.8 CALCULATION OF BOUND WATER AND
- Page 319 and 320: The values of K 1 , K 2 and W were
- Page 321 and 322: Table 6.7. Separation of the total
- Page 323 and 324: Table 6.7. (Contd.) Sample 30 o C 4
- Page 325 and 326: 3 0 S talk fibre 4 0 Stalk pith 3 0
- Page 327 and 328: 3 0 Reconstituted cane at 30 o C 3
- Page 329 and 330: when water is added to dry wood, wh
- Page 331 and 332: It is evident that in some cases ma
- Page 333 and 334: The number of adsorbed monolayers,
- Page 335 and 336: Data in Tables 2.9 and 2.11 show th
- Page 337 and 338: particular fibre is systematically
- Page 339 and 340: Anon. (1985b). Laboratory manual fo
- Page 341 and 342: Blanchi R.H. and A.G. Keller (1952)
Stalk fibre Stalk pith Rind fibre<br />
8<br />
8<br />
8<br />
mo /% db<br />
6<br />
4<br />
2<br />
mo /% db<br />
6<br />
4<br />
2<br />
mo /% db<br />
6<br />
4<br />
2<br />
0<br />
30 40 50 60<br />
Temperature/ o C<br />
0<br />
30 40 50 60<br />
Temperature/ o C<br />
0<br />
30 40 50 60<br />
Temperature/ o C<br />
Rind fines Top fibre Dry leaf fibre<br />
8<br />
8<br />
8<br />
mo /% db<br />
6<br />
4<br />
2<br />
mo /% db<br />
6<br />
4<br />
2<br />
mo /% db<br />
6<br />
4<br />
2<br />
0<br />
30 40 50 60<br />
Temperature/ o C<br />
0<br />
30 40 50 60<br />
Temperature/ o C<br />
0<br />
30 40 50 60<br />
Temperature/ o C<br />
Dry leaf fines Green leaf fibre Green leaf fines<br />
8<br />
8<br />
8<br />
mo /% db<br />
6<br />
4<br />
2<br />
mo /% db<br />
6<br />
4<br />
2<br />
mo /% db<br />
6<br />
4<br />
2<br />
0<br />
30 40 50 60<br />
Temperature/ o C<br />
0<br />
30 40 50 60<br />
Temperature/ o C<br />
0<br />
30 40 50 60<br />
Temperature/ o C<br />
52 weeks<br />
36 weeks<br />
Figure 6.1. Variation of the GAB model monolayer moisture content with temperature<br />
for the nine cane components of R 570 aged 52 and 36 weeks.<br />
240
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