Controlling the Aggregative Stability of Feedstock Blends and Petroleum Products
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rolling the Aggregative Stability of Feedstock Blends and Petroleum Products O. F. Glagolevaa, *, V. M. Kapustina, I. V. Piskunovb, and M. R. Usmanovb aGubkin
Russian State University of Oil and Gas (National Research University), Moscow, 119991 Russia bOOO LUKOIL-Nizhegorodniinefteproekt, Nizhny Novgorod, 603006 Russia *e-mail: [email protected] Received June 25, 2019; revised March 17, 2020; accepted May 12, 2020
Abstract—The article highlights one of the important problems in oil refining, the compatibility of components in the formation of feedstock blends and marketable petroleum products. The principles of determining and controlling the kinetic stability of oil blends to phase separation are set out. Examples of incompatibility of components (crude oils, components of light and dark products, fuel additives) are presented. At the same time, it has been noted that phase separation is the target process in some cases, such as dewatering of crude oil and oil products, lube oil production, etc. Keywords: petroleum disperse systems, crude oil compatibility, phase separation stability of petroleum products DOI: 10.1134/S0965544120090108
INTRODUCTION In most cases, not individual crude oils, but their blends are pumped through oil pipelines. A similar situation is also typical for refineries: oil blends of various compositions are often supplied to primary refining plants, and mixtures of various fractions and residues are sent to secondary refining units. In addition, commodity petroleum products in most cases are also blends of two or more components. In this situation, it is often required to maintain not only the conformity of the main quality indicators of marketable products with regulatory requirements, but also their stability over time—to preclude incompatibility of their components and signatures of phase separation in the product. In relation to the refinery feedstock, crude oil blending is of great importance both at the stage of transportation, oil preparation for refining (desalting and dewatering), and at the refining steps per se. Blended raw materials are processed at a number of plants. As components, cheap varieties of the socalled “opportunistic” crudes, slop products, and sour gas condensates are used [1]. Blending and introducing additives, improvers, and surfactants into a petroleum system or subjecting it to other impacts change the balance of forces of intermolecular physical interactions. In addition to blending and doping with additives, other means can be used such as exposure to magnetic or electric field, sonication, and wave treatment to create uniform feed streams and product mixes stable against phase separation.
On the other hand, in a number of cases, on the contrary, it is necessary to achieve phase separation in the system. In each particular case, it is necessary to find ways of controlling the system stabilityeither increasing it or decreasing to facilitate phase separation. A striking example of the need for phase separation in the system is the oil desalting and dewatering pr
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