rheological properties

Technological Features of High-Sulfur Heavy Crude Oils Processing

Crude oils of the Yablunivsky deposit (Poltava region, Ukraine) have been studied in order to choose further ways of their processing. The fractional composition was studied by the method of simulated distillation. The structural and mechanical properties of petroleum products, the content of metals and the elemental composition were determined. Studies have shown that oils are of high-sulfur heavy grade, without light distillates; they have high density, viscosity, and large amounts of metals. A flow chart for the processing of such oils has been proposed.

The Study of Calcium Hydroxide Structure and its Physico-Chemical and Electrokinetic Properties in Sugar Production

This article discusses the influence of the methods of lime cream generation and its physico-chemical properties on raw juice purification process. It offers some measures for the raw juice clarification process failure prevention that stem from the methods of lime cream preparation. The electrokinetic potential of the lime cream is studied and the structure of calcium hydroxide micelle is proposed.

Rheological Properties of Polymer Colloid–Cellulose Thickener Systems

An approach to water emulsions modification with structure forming additives, namely cellulose esters, is proposed in the article. Influence of the film former origin on the system rheological properties at different shear-strain rates was examined. Structural and mechanical, as well as rheological properties of the studied systems were determined. The results confirm that hydroxyethylcellulose has a greater structure forming effect in comparison with carboxymethylcellulose.

On the Influence of Micro- and Macro-Cristalline Paraffins on the Physical and Rheological Properties of Crude Oil and Organic Solvents

The influence of micro- and macro-crystalline paraffins on the properties of crude oil and organic solvents was investigated. Micro-cristalline paraffins promote the most pronounced changes in the investigated physical and rheological properties of all tested solutions. The concentration of branched-alkanes in paraffins is the pivotal parameter that promotes these changes.