Heavy oil supercritical extraction multistage parallel separation treatment system and treatment method

Abstract

The invention relates to a heavy oil supercritical extraction multistage parallel separation treatment system. The system comprises a feeding unit, a solvent mixing unit and N groups of supercriticalextraction separation units which are arranged in parallel. Each supercritical extraction separation unit comprises an asphalt separation tower, an asphalt stripping tower, a deasphalted oil separation tower and a deasphalted oil stripping tower. Each stage of mixer is connected to the asphalt separation tower of the corresponding supercritical extraction separation unit, a raffinate phase outletat the bottom of each asphalt separation tower is connected with the corresponding asphalt stripping tower, an extract phase outlet at the top of each asphalt separation tower is connected to the corresponding deasphalted oil separation tower, and a material outlet at the bottom of each deasphalted oil separation tower is connected with the corresponding deasphalted oil stripping tower. Top extraction solvent outlets of the asphalt stripping towers and the deasphalted oil stripping towers are connected to the solvent mixing unit through an extraction solvent recovery unit. According to the heavy oil supercritical extraction multistage parallel separation treatment system and method, parallel multi-stage extraction is achieved, various deasphalted oil or asphalt products of different specifications can be produced at the same time, meanwhile, the operation is stable, and the energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of supercritical extraction, in particular to a heavy oil supercritical extraction multistage parallel separation treatment system and treatment method. Background technique [0002] The extraction solvent separation process is to use an appropriate extraction solvent to treat the liquid or liquid-solid mixture, using the characteristics of different solubility of the components of the mixture in the extraction solvent, and the principle of similar miscibility, so that the components to be separated in the mixture are dissolved in the extraction solvent. Solvent, so as to achieve the purpose of separation from other components. [0003] Extraction solvent separation process is an important process in oil refining and chemical industry, and is widely used in oil refining industry. For example, extraction solvent deasphalting of lubricating oil raw material and catalytic cracking raw material from heavy oil, ...

AI Technical Summary

Problems solved by technology

It is impossible to produce products of different specifications and quality at the same time, such as lubricating base oils, various types, and different specifications. One set of equipment can only produce products of one specification at the same time. If products of other specifications are produced, the operating conditions need to be adjusted, which is not flexible enough

Moreover, limited by the manufacture of high-pressure vessels, both the extraction tower and the extraction solvent separation tower are high-pressure vessels with an operating pressure of 40-50 bar. It is difficult to manufacture large-diameter vessels, so the maximum processing capacity is limited.

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