Journal . had a melting point of40—41 . whilst the distillate was crystalline and meltedat 36—37°. Both tie residue and distillate of the liquidvaselin were Quid. From the fact that tbo solid hydro-carbons present in vaselin are amorphous and onlyassume a crystalline structure when subjected to distilla-tion, the authors conclude tbat paraffin does not, as a I aeid than natural or artificial vaselin, whilst of tlic latter,tbe aitiliciaI product absorbs the least amount of oxygen. -i). 0. Separation of Stearic and Oleic Acids. Dingl. Poljt. , 48 and 49. In the ordinary method of separation
Journal . had a melting point of40—41 . whilst the distillate was crystalline and meltedat 36—37°. Both tie residue and distillate of the liquidvaselin were Quid. From the fact that tbo solid hydro-carbons present in vaselin are amorphous and onlyassume a crystalline structure when subjected to distilla-tion, the authors conclude tbat paraffin does not, as a I aeid than natural or artificial vaselin, whilst of tlic latter,tbe aitiliciaI product absorbs the least amount of oxygen. -i). 0. Separation of Stearic and Oleic Acids. Dingl. Poljt. , 48 and 49. In the ordinary method of separation from the mixtureof fatty acid-, which is obtained bv saponification oftallow or palm-oil by means of lime, tne solid stearic acid(so-called stearin) is removed by passing through afilter-press a1 the ordinary temperature. Under theseconditions a considerable quantity of stearic acid remainsdissolved in the liquid oleic acid. By moderate cooling,a further quantity of this stearic acid can be obtained. rule, exist in crude, petroleum in a crystalline form ;moreover, they consdcr the solid hydrocarbons found inthe crude oil to be chemically identical with ozokerite,which is frequently regarded as petroleum in a dried-upcondition. It is, of course, possible that in isolated cases uuiuuii! ii i>. >>i etuise, puaoiuie inai in isoiaun cases ratlin may exist in petroleum, in a fully developed ite. The authors are, however, of opinion, that a rule it occurs in a transition form. The parstate a rule it occurs in a transitiondifference between natural ami artificial vaselin is con-siderable. Artificial vaselin is resolved into oil andceresin when subjected to distillation, and differssensibly in viscosity, as shown bj the following figuresobtained with Englers apparatus and compared withwater as the standard :— 15 50 Natural American Vaselin .. 1*8 .... :t7 ... Artificial Vaselin (eases i: lo runout, to runout. Prom a series of experiments made n ith a view tu ascer-tain
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
