METHOD FOR PREDICTING CRITICAL SOLVENT CAPACITY OF VISCOSITY BREAKING RESIDUE FLOW Russian patent published in 2022 - IPC G01N33/28 

FIELD: oil industry.

SUBSTANCE: invention relates to a method for predicting a critical solvent capacity CSP_VisRes(OI) of a studied viscosity breaking residue flow. The method includes: predicting CSP_VisRes(OI) based on a critical percent content CPT_AR(OI) of titrant for stability of asphaltenes in an atmospheric residue flow. In this case, the studied atmospheric residue flow is obtained from the same crude oil as the studied viscosity breaking residue flow using a correlation obtained by a method including for each of a set of crude oils the measurement of CSP_VisRes(OI) of the viscosity breaking residue flow obtained from each of the set of crude oils, wherein CSP_VisRes(OI) is a minimal solvent capacity required for preserving asphaltenes in a hydrocarbon flow in a state of full dispersion in a solution, and CPT_AR of the atmospheric residue flow obtained from each of the set of crude oils. In this case, CPT_AR is predicted using the following formula: CPT_AR = 100 - (100 × CSP_AR) / SP_AR, in which CPT_AR is a critical solvent capacity of an atmospheric residue, and SP_AR is a solvent capacity of an atmospheric residue. Then, the correlation between CSP_VisRes and CPT_AR is determined. The invention also concerns a method for predicting the stability of the studied viscosity breaking residue flow, a method for producing the studied viscosity breaking residue flow during oil refining, preventing the precipitation of asphaltenes from the studied viscosity breaking residue flow, a method for predicting a critical solvent capacity CSP_FO of oil fuel, a method for predicting the stability of oil fuel, a method for producing oil fuel during oil refining, preventing the precipitation of asphaltenes from oil fuel.

EFFECT: providing the operation in a viscosity breaking (hereinafter – VSB) plant in a mode, in which the quality of initial material and operation conditions of the VSB plant do not lead to an excessive conversion degree and, thus, to the instability of asphaltenes during the viscosity breaking process, and the resulting viscosity breaking residue flow has a sufficient stability factor to allow the addition of any distillate oil product and pass tests on the stability of final fuel, such as IP 390 test.

16 cl, 5 ex, 1 tbl, 7 dwg