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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

Active Publication Date: 2022-03-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for recovering light lubricating oil raw material oil dewaxing solvent in order to overcome the problem of high energy consumption and material consumption in the process of rectifying and recovering organic solvents using ketone-benzene dewaxing equipment in the prior art and light lubricating oil stock oil dewaxing method

Method used

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  • Method for recovering light lubricating oil stock oil dewaxing solvent and method for dewaxing light lubricating oil stock oil
  • Method for recovering light lubricating oil stock oil dewaxing solvent and method for dewaxing light lubricating oil stock oil
  • Method for recovering light lubricating oil stock oil dewaxing solvent and method for dewaxing light lubricating oil stock oil

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to the technical field of dewaxing process of lubricating oil raw material oil, and discloses a method for recovering a dewaxing solvent of light lubricating oil raw material oil and a method for dewaxing light lubricating oil raw material oil. The recovery method comprises contacting a solution containing a light dewaxed lubricating oil raw material oil and an organic solvent with a nanofiltration membrane, wherein the nanofiltration membrane is a nanofiltration membrane prepared from P84 polyimide, and the molecular weight cut-off of the nanofiltration membrane is 200- 300Da, the contact pressure is 1-6MPa, and the light lubricating oil feedstock oil is a crude oil fraction with a boiling range of 280-500°C. The average content of the organic solvent in the permeate obtained by the method for recovering the dewaxing solvent provided by the present invention is higher, the effect of recovering the dewaxing solvent at normal temperature is better, and the process steps are simple; The higher average flux makes the energy consumption of the method smaller, and the material consumption in the method is reduced.

Description

technical field [0001] The invention relates to the technical field of lubricating oil dewaxing technology, in particular to a method for recovering a light lubricating oil stock oil dewaxing solvent and a method for dewaxing light lubricating oil stock oil. Background technique [0002] Lubricating oil is the most widely used petrochemical product and the product closest to consumers. It is an important material related to the national economy, the people's livelihood and national security. It is called the "blood" of modern industry. At the same time, lubricating oil is a high-tech, high-efficiency product. From the analysis of the overall oil refining industry, the benefit of producing lubricating oil is obviously higher than that of fuel oil. In the production process of lubricating oil, since petroleum fractions contain long-chain n-alkanes, which are commonly referred to as "waxes", when the temperature drops, these "waxes" will wrap around the surrounding lubricating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D71/64C10M177/00
CPCB01D61/027B01D71/64C10M177/00B01D2311/14
Inventor 辛益双李传清徐林谭金枚
Owner CHINA PETROLEUM & CHEM CORP
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