Evaluation of low-temperature properties of petroleum products by a potential method

Abstract

Proposes a method for determining the solid points of petroleum products. Points out that presently available methods for calculating the cloud and solid points of petroleum products by visual observation of loss of mobility (e.g. GOST method) are poor in reproducibility and sensitivity. Explains that the proposed method is based on the indication of crystal formation processes by the potential generated at the interface between solid and liquid phases as the product is cooled, at the moment of structure formation and growth of the solid phase. Notes that the potential thus generated is related to changes in the state of aggregation of organic and other substances in their directed crystallization and is accompanied by separation of charge. Suggests that the moment of potential appearance can be used to find the temperature interval for first clouding of the product, thus enabling solidification and clouding to be detected in the earlier stages of the cooling process. Indicates that the time required for determination of the solid point using the proposed method is 10 min., compared to 1-1.5 hr. using the GOST 20287-74 method.