Method for recovering light lubricating oil stock oil dewaxing solvent and method for dewaxing light lubricating oil stock oil
A technology for lubricating oil and raw material oil, applied in the directions of lubricating compositions, chemical instruments and methods, membranes, etc., can solve the problems of high energy consumption and material consumption, and achieve the effects of reduced material consumption, simple operation and low energy consumption
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Embodiment 1
[0055] (1) Stir and mix 150g of crude oil with a boiling range of 358°C-500°C and 400g of ketonebenzene organic solvent at 30°C for 0.5h, and cool the resulting mixture to -25°C for crystallization , filter after 1h, obtain the filtrate that contains light dewaxing lubricating oil stock oil and ketone benzene organic solvent, the ketone benzene organic solvent that dewaxing uses is the mixture that methyl ethyl ketone and toluene mix and form, and wherein the weight ratio of methyl ethyl ketone / toluene is 60: 40;
[0056] (2) Add 500mL of ketone-benzene solvent mixed by methyl ethyl ketone and toluene to form in the mother liquid tank of membrane separation device, wherein the mass ratio of methyl ethyl ketone / toluene is 60:40, the organic solvent resistant nanofiltration membrane (purchased from Evonik Specialty Chemicals (Shanghai) Co., Ltd.'s asymmetric organic solvent-resistant nanofiltration membrane has a molecular weight cut-off of 200Da and a membrane area of 0.0014m...
Embodiment 2
[0061] (1) 170g of crude oil with a boiling range of 358°C to 500°C was stirred and mixed with 500g of ketonebenzene organic solvent at 32°C. The duration of mixing was 1h, and the resulting mixture was cooled to -20°C for crystallization. Filtrate after 2h to obtain the filtrate containing light dewaxing lubricating oil stock oil and ketone-benzene organic solvent, the ketone-benzene organic solvent used for dewaxing is the mixture formed by mixing methyl ethyl ketone and toluene, wherein the weight ratio of methyl ethyl ketone / toluene is 70:30 ;
[0062] (2) The concentrated solution in Example 1 is emptied, and the filtrate 500mL that contains light dewaxed lubricating oil stock oil and ketonebenzene organic solvent that step (1) obtains is added in the mother liquor tank, with the total amount of this solution being Benchmark, the content of the light dewaxed lubricating oil stock oil in this solution is 23% by weight, the mass fraction ratio of methyl ethyl ketone / toluene...
Embodiment 3
[0067] (1) 150 g of crude oil with a boiling range of 358° C. to 500° C. and 450 g of ketonebenzene organic solvent were stirred and mixed at 35° C., and the mixing duration was 1 h, and the resulting mixture was cooled to -15° C. for crystallization, Filtrate after 2h to obtain the filtrate containing light dewaxing lubricating oil stock oil and ketone benzene organic solvent, the ketone benzene organic solvent used for dewaxing is the mixture formed by mixing methyl ethyl ketone and toluene, wherein the weight ratio of methyl ethyl ketone / toluene is 60:40 ;
[0068] (2) Add 500mL of ketone-benzene solvent mixed by methyl ethyl ketone and toluene to form in the mother liquor tank of membrane separation device, wherein the weight ratio of methyl ethyl ketone / toluene is 60:40, cut the molecular weight cut-off resistant organic solvent nanofiltration membrane (the The organic solvent-resistant nanofiltration membrane is a P84 polyimide membrane with a molecular weight cut-off of...
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