Tentative Method of Test for Characreistic Groups in Rubber Extender and Processing Oils by the Precipitaion Method
|Publication Date:||1 January 1965|
This method covers the determination of the composition of petroleum oils and asphalts in terms of content of asphaltenes, polar compounds, unsaturated hydrocarbons Group I or first acidaffins, unsaturated hydrocarbons Group II or second acidaffins, and saturated hydrocarbons. The method is applicable to all noncracked petroleum products with initial boiling points above 280 C. The original Rostler-Sternberg method3 has been used as the basis for classification of rubber extender oils since 1953. The procedures described herein are modifications of the original Rostler-Sternberg method and give identical results in a shorter time than is required for the older method. A further advantage of the modified method is that the procedures do not require the use of fuming sulfuric acid.4
NOTE 1.-This method may not give the same level of results as those obtained using Method D 2007, Test for Characteristic Groups in Rubber Extender and Processing Oils by the Clay-Gel Adsorption Chromatographic Method.4a
NOTE 2.-This method is described in full, although the determination of the first and second acidaffins is not used for classification purposes.
3 Fritz S. Rostler and Heinz W. Sternberg, "Compounding Rubber with Petroleum Products", Industrial and Engineering Chemistry, Vol. 41, pp. 598-608 (1949).
4 Silica gel adsorption is substituted for acid precipitation.
4a Appears in this publication.