and on the Preparation of Glycol 437 



Glycol. Glycerine. 



H J H2 J 



Monoacetate of glycol. Monoacetine. 



. H. J 



Diacetine. 



It is isomeric with butylactic acid, C^ H^ 0^ the homologue 

 of lactic acid obtained by Wuvtz by the oxidation of amyle- 

 glycol *. 



From the distillate which passed over below 180°, a further 

 quantity of monoacetate of glycol may be thus obtained. It is 

 again rectified, and the portion distiUing at and above 180° col- 

 lected separately. The distillate below this point, which consists 

 of acetic acid and monoacetate of glycol, is neutralized with 

 baryta, somewhat evaporated in the water-bath, and then digested 

 with ether. From this etherial solution the monoacetate is ob- 

 tained by rectification. 



Some glycol was prepared from the monoacetate by Wurtz's 

 method — distillation with hydrate of potash : — 



C^H^O l02 + KII0 = C2H3K0H jj^ f^^* 



H J Acetate of Glycol. 



Monoacetate of potash, 



glycol. 

 To 14 grms. of monoacetate the equivalent quantity of fused 

 and powdered potash was gradually added. The evolution of 

 heat showed that an action was at once set up. The mixture 

 was allowed to stand some time, and then distilled, at first in a 

 sand-bath, and then with the heat of a spirit-lamp. The crude 

 product thus obtained was rectified ; the greater part of it had 

 the constant boiling-point 193° C. Its identity with glycol is 

 evident from the following combustion : — 



0-170 grm. gave 0-2385 grm. carbonic acid and 0*147 grm. 



water. Calculated. Found. 



C^ = 24 = 38-70 38-18 



H« = 6 = 9-67 9-61 



0^ = 32 = 51-63 52-21 



62 

 The description of the properties of glycol given by Wurtz I 



* Phil. Mag. October 1858. 



