A pre-extraction assisted-solvent extraction process for oil sands or sludge containing heavy crude oil

By using a combined extraction method of aromatic hydrocarbons and cycloalkanes, the problem of efficient separation of asphaltenes in oil sands and sludge was solved, achieving low-energy consumption, high-efficiency extraction and resource utilization, while meeting environmental protection standards.

CN117384660BActive Publication Date: 2025-12-09SHANDONG UNIV
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Patent Information

Application Number
CN202311475480.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-07
Publication Date
2025-12-09
Estimated Expiration
2043-11-07

AI Technical Summary

Technical Problem

Existing technologies for treating oil sands and oily sludge suffer from problems such as low extraction efficiency, high energy consumption, high equipment requirements, and poor extraction effect on bituminous substances, making it difficult to achieve harmless treatment and resource utilization.

Method used

A method using aromatic hydrocarbons and dialkylene with boiling points below 100℃, through pre-extraction and the use of cycloalkanes, is used to separate an oil-containing solid-liquid mixture from a first extractant. The method combines pre-extraction and extraction with cycloalkanes with static or centrifugal separation to achieve effective separation of asphaltenes.

Benefits of technology

It achieves high-efficiency extraction with low-temperature operation and low energy consumption, with a solid residual oil rate of less than 1 wt%, which meets environmental protection standards. Furthermore, the extractant can be recycled, resulting in significant resource utilization.

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Abstract

The application provides a pre-leaching auxiliary solvent extraction method for oil sand or oil sludge containing heavy crude oil, and belongs to the technical field of product separation and solid waste treatment in the field of petroleum chemical industry. The bitumen is dispersed by using aromatic hydrocarbon first, and then extracted by using naphthenic hydrocarbon, so that good extraction effect can be achieved, a surfactant does not need to be added, the solid phase residual oil rate after treatment is less than 1wt%, and the national relevant standard is met; the pre-leaching agent and the extractant used in the application have low boiling points, are easy to distill and recover, and the recovery rate is greater than 85%. In addition, the method provided by the application has the operation temperature of room temperature (20-30 DEG C), the operation condition is mild, the method is simple, the energy consumption is low, the organic solvent and the crude oil (containing bitumen and other heavy components) can be recovered by distillation, and the resource utilization is realized.
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