General experimental procedure, methods of analysis, and purification of materials have been given sufficiently in detail in order that the sources of difficulty and uncertainty in the results obtained not only in this paper but also in this series of investigations on the non-catalytic synthesis of hydrocarbon liquids directly from calcium carbide may be estimated. Orientation and exploratory investigations have been made on hydrogen systems, and it has been found that a grain size of 1 to 2 mm, a saturation temperature of 80°C, and a reaction temperature of 340°C proved most suitable for the synthesis of liquid hydrocarbons under our experimental conditions. The effects on the formations of the products of temperature have been discussed. These effects are intimately associated with the heat of reaction involving the carbide which is large. The effects of the time of contact and of the grain size have been briefly mentioned in passing.
(1) Ethylenediguanidine- and tetramethylenediguanidine dihydrochloride were prepared by the reaction of 3 mols of cyanamide with 1 mol of corresponding diamine dihydrochloride in fused state at about 140°C. The yield was about 100% of the theory. (2) The dihydrochlorides were purified by the extraction with acetone which dissolved dicyandiamide. (3) The method for preparing free diguanidines in crystal form is described. (4) Various salts of these diguanidines were prepared from dihydrochlorides and free diguanidines and the melting point and other properties of these salts are also described.
(1) A method of determining relatively small amount of adsorption has been devised. To measure the change of concentration of solution before and after the adsorbing procedure, the density determination using the float method is applied. (2) The experiments are described on the adsorption of some fatty acids from the toluene solution by the glass powder.