Chemistry. — "On the Snponijication of Fais." II. By Dr. J. P. 

 Trkub. (Communicated by Prof. S. Hoogewerff). 



(Communicated in the meeting of June 30, 1917.) 



§ J . Ill a previous paper ^) equations were derived for the case 

 that saponification takes place in emulsion, which equations indicate 

 the quantities of glycerine and fatty acid present in free state after 

 an arbitrary time. 



These equations are: 



(2p-3)(^-3) ^ (2p-3) (9-2p) (7-3)(7-2p) '^ 



T= 1 _ l+(^^-^)(^zi),-3.+ '(^-P) ,-v. ^__,-... . (2) 



(2jt>-3)(^-3) ^ (2p-S){q-2p) {q-^)(q-2p) 



Equation (1) represents: the fraction of the total number of 

 molecules of glycerine, present after the time t in free state. (Relative 

 concentration of the free glycerine after the time t). 



Equation (2) expresses : the relative concentration of the free fatty 

 acid after the time t. 



In these equations p and q represent: the increase of concen- 

 tration of di- resp. monoglycerides at the surface of contact between 

 fat- and waterphase, in consequence of the adsorption. 



When the velocity 'constant k is not constant in reality (as in the 

 saponification in emulsion, where the surface of contact between 

 fat- and water phase constantly varies in size), the equations (1) 

 and (2) have no physical meaning each in itself. When, however, 

 we eliminate k X U which is possible for different numerical values 

 of p and q, we arrive at equations of the general form ƒ (^, T)=zO, 

 which give the connection between the relative concentrations of 

 free glycerine and free fatty acid for the assumed values of the 

 adsorption constants p and q. As was proved ^) these equations are 

 independent of the variability of the constant of velocity k. 



In the saponification in emulsion complications make, therefore, 

 their appearance, which in some cases entirely cover the stagewise 



1) These Proc. 20, 35 (1916). 

 ') loc. cit. 41. 



