关键词: 溶剂, 油砂沥青, 溶剂脱沥青, 溶剂比, 脱沥青油收率, 装置能耗

Abstract: In order to optimize the operation of the solvent deasphalting unit in an oil sand asphalt upgrading plant, the operation status and existing problems of solvent deasphalting unit are analyzed. By studying the influence of solvent composition and process conditions on the efficiency and energy consumption of the solvent deasphalting unit, combined with theoretical calculation and industrial benchmarking, the operation optimization suggestions of the solvent deasphalting unit are put forward. And the optimized operation of the solvent deasphalting unit is proposed. The solvent deasphalting unit uses n-C₅H₁₂ with purity higher than 99.9%, which has strict requirements on solvent quality, resulting in high solvent cost. The mass ratio of solvent/residue is as high as 7, which will cause high energy consumption of the unit. By the optimization, when the purity of n-C₅H₁₂ solvent is more than 90% and the content of n-C₄H₁₀ solvent is less than 10%, the deasphalted oil yield reduction is not more than 1%, but the requirements for quality of solvent is reduced obviously. By adjusting the mass ratio of solvent/residue to 4, although the yield of deasphalted oil is reduced by 0.8 percentage points, the energy consumption of solvent deasphalting unit is reduced by about 33.4%.

Key words: solvent, oil sands bitumen, solvent deasphalting, ratio of solvent, yield of deasphalted oil, energy consumption of the unit