Heavy oil viscosity reduction and desulfurization method based on supercritical methanol

Abstract

The invention discloses a heavy oil viscosity reduction and desulfurization method based on supercritical methanol, which is characterized in that heavy oil is subjected to a modification reaction in a supercritical methanol environment, the heavy oil is placed in the supercritical methanol environment for a certain time mainly through temperature and pressure control, on one hand, the dissolving capacity of the supercritical methanol for each component in the heavy oil is adjusted, so that polymerization among macromolecules is inhibited while macromolecules are cracked into small molecules, and on one hand, the reaction performance of methanol hydrogen supply and the like is adjusted, and viscosity reduction and desulfurization of heavy oil on the premise of inhibiting coking are achieved. By adopting the method, the conversion rate and the reaction rate of the heavy oil visbreaking reaction can be improved without a catalyst, the coking phenomenon of the system is avoided, and the content of heteroatoms such as sulfur and nitrogen is reduced.

Description

technical field [0001] The invention relates to the field of heavy oil viscosity reduction and desulfurization, in particular to a heavy oil viscosity reduction and desulfurization method based on supercritical methanol. Background technique [0002] The rapid development of human society since modern times is inseparable from the support of fossil energy. Petroleum resources are currently the most widely used and most demanded energy, and their reserves are decreasing day by day, and their quality is becoming more and more serious. At present, heavy oil products such as oil sand bitumen and super heavy oil are one of the energy sources with the largest reserves in the world. The global storable and recoverable volume is about 400 billion tons, which is 2.7 times that of conventional crude oil. How to make more reasonable and effective use of heavy oil products is very important in the critical period when it is not enough to fully meet the needs of society. [0003] Althou...

AI Technical Summary

Problems solved by technology

However, this method ignores the influence of supercritical water on equipment materials

[0009] In order to solve the problems of harsh reaction conditions, low conversion rate and easy coking of the system in the current heavy oil supercritical fluid processing technology, a heavy oil viscosity reduction and desulfurization method based on supercritical methanol is provided. Quality reaction, mainly through the control of temperature and pressure, the heavy oil is placed in the supercritical methanol environment for a certain period of time. On the one hand, the supercritical methanol can adjust the dissolving ability of each component in the heavy oil, so that the macromolecules in it are cracked into smaller ones. Molecules, on the one hand, adjust the reaction performance of methanol hydrogen supply, etc., and realize the viscosity reduction and desulfurization of heavy oil under the premise of suppressing coking

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