16 



DMSO Xylan 



17 



1,2 



40 



16 17 



DMSO Xylan 

 Plus 5%ZnCl2 



\ 



8 12 16 20 24 28 32 

 Retention time ►(min.) 



I I I 



100 160 



Temperature (°C.) 



220 



isothermal 



1.2 



17 



Base Xylan 



16 



40 



J I I I I I I ' ' 



8 12 16 20 24 28 32 

 Retention time ► (min.) 



I I I 



100 160 



220 



isothermal 



Temperature (°C.) 



Figure 14. — Chromatograms of DMSO and base xylan with and without treatment with 5 per- 

 cent zinc chloride. The peaks are: (1), (2) fixed gases; (3) aoetaldehyde; 

 (4) furan; (5) acetone; (6) propionaldehyde ; (7) methanol; (11) 2 } 3-butanedione; 

 (12) ethanol; (13) crotonaldehyde; (14) l-hydroxy-2-propanone; (15) acrolein; 

 (16) acetic acid; and (17) 2-furaldehyde . 



22 



