FREE BOOKS

Author's List




PREV.   NEXT  
|<   76   77   78   79   80   81   82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100  
101   102   103   104   105   106   107   108   109   110   111   112   113   114   115   116   117   118   119   120   121   122   123   124   125   >>   >|  
ilar to the lignone of the woods. This was confirmed by a well-marked reaction with ferric ferricyanide with increase of weight due to the fixation of the blue cyanide. But the most characteristic feature is the high yield of furfural on boiling with condensing acids. The following numbers were determined: Total furfural from original fibre 14.84 In residue from alkali hydrolysis 11.5 In cellulose isolated by Cl method 10.4 Treated with sulphuric acids of concentration, (a) 92.1 grs. H_{2}SO_{4} per 100 c.c., (b) 105.8 grs. per 100 c.c., the fibres dissolve, and diluted immediately after complete solution it was resolved into (a) (b) Reprecipitated fraction 68.7 43.7 Soluble fraction yielding furfural 13.2 14.3 By these observations it is established that the furfuroids are of the cellulose type and behave very much as the furfuroids of the cereal celluloses. This group of seed hairs invites exhaustive investigation. The furfuroid constituents are easily isolated, and as they constitute at least one-third of the fibre substance it is especially from this point of view that they invite study. RECHERCHES SUR L'OXYCELLULOSE. L. VIGNON. ~Resume of investigations (1898-1900) of Oxycellulose, published as a brochure~ (Rey, Lyon, 1900). (a) A typical oxycellulose prepared from cotton cellulose by the action of HClO_{3} (HCl + KClO_{3}) in dilute solution at 100 deg. for one hour gave the following numbers: C H O Elementary composition 43.55 6.03 50.42 Oxycellulose Original cellulose Analysis by Lange's method Soluble in KOH (at 180 deg.) 87.6 12.0 Insoluble in KOH (at 180 deg.) 12.4 88.0 Oxycellulose Original cellulose Heat of combustion 4124-4133 4190-4224 Heat evolved in contact with 50 times wt.} normal KOH per 100 grms. } 1.3 cal. 0.74 cal. Oxycellulose Cellulose Absorption of colouring } Saffranine 0.7 0.0 matters at 100 deg. per 100 grms. } Methylene blue 0.6 0.2 (b) _Yield of furfural from cellulose, oxy- and hydro-cellulo
PREV.   NEXT  
|<   76   77   78   79   80   81   82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100  
101   102   103   104   105   106   107   108   109   110   111   112   113   114   115   116   117   118   119   120   121   122   123   124   125   >>   >|  



Top keywords:

cellulose

 

Oxycellulose

 

furfural

 

solution

 

method

 
isolated
 

Original

 

Soluble

 

furfuroids

 
fraction

numbers

 
reaction
 

ferricyanide

 

composition

 

ferric

 

Elementary

 

dilute

 

oxycellulose

 

weight

 

increase


investigations

 

Resume

 

OXYCELLULOSE

 

VIGNON

 

published

 

brochure

 

prepared

 

cotton

 

typical

 

action


Cellulose

 
normal
 

contact

 

Absorption

 

colouring

 
cellulo
 

Methylene

 

Saffranine

 

matters

 

evolved


confirmed

 

Analysis

 

Insoluble

 

combustion

 

lignone

 

marked

 
complete
 

condensing

 

resolved

 

immediately