288 The Philippine Journal of Science 1923 



yields stearin (melting point, 71.6°) it would seem that the 

 melting point of this sample should have been somewhat higher. 

 The rather low value obtained is probably due to the fact that 

 in determining the melting point the stearin tends to dissolve 

 in the palmitin (melting point, 63° to 65.5°), which has a lower 

 melting point. A test experiment was performed by mixing 

 stearin with palmitin in the same proportions as they are 

 present in hydrogenated pili-nut oil. The melting point of the 

 mixture was found to vary from 68° to 69°. These values are 

 slightly higher than the results obtained with hydrogenated 

 pili-nut oil but, as Lewkowitsch 14 has pointed out, even pure 

 glycerides show irregularities in their melting points which are 

 not usually given by definite chemical compounds. The results 

 of these experiments indicate that pili-nut oil contains no satur- 

 ated glycerides of low melting point and, in general, agrees in 

 composition with the oil that showed the saturated glycerides 

 to consist mostly of palmitin. 



Table 5. — Hydrogenation of pili-nut and lumbang oils.'' 



— • 



Nickel, 1 percent. Iodine value, HUbl. 



Pili-nut oil. 





Catalyst I. 



Catalyst G. 



Catalyst I. 



Catalyst G. 



Hours. 



i:i 



™f 



1 



1 





















The results of hydrogenating pili-nut and lumbang oils with 

 different catalysts, each of which had a concentration of 1 per 

 cent nickel, are given in Table 5. These catalysts were made 

 under identical conditions and were expected to give the same 

 results. Both catalysts gave approximately the same results 

 with pili-nut oil. With lumbang oil, however, catalyst I was 

 considerably more effective than catalyst G. The data given 

 for catalyst G show how the activity of the catalyst may some- 



