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A kind of ketone-benzene dewaxing process of low wax content raw material

A ketone benzene dewaxing and process technology, which is applied in the recovery/refining of mineral wax, petroleum industry, and petroleum wax recovery, etc., can solve the problems of disorder, low filtration system operation, high energy consumption, etc.

Active Publication Date: 2021-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this process are: large energy consumption, only suitable for low waxy oil, which limits its application range, and slow development speed
[0009] The feed wax content of the currently operating ketone-benzene dewaxing unit is generally around 20% to 30%. If the wax content is too low, the operation of the filtration system will be disturbed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A kind of ketone-benzene dewaxing process of low wax content raw material, comprises the steps:

[0051] 1) Dewaxing: the first ketonebenzene dewaxing solvent dilutes the low-wax raw material three times and then carries out cold washing, and is filtered and separated to obtain a dewaxed filtrate and an oil-containing wax liquid; the wax content of the low-wax raw material is 9wt%, and the feed temperature is -25°C; the primary ratio is 1; the secondary ratio is 1.5; the third ratio is 2; the cold wash ratio is 1.5, and the cold wash temperature is -20°C; the distillation range of the low-wax raw material is 304-364°C, containing wax The amount is 9wt%, the flash point is 161 ℃, and the freezing point is 8 ℃; the obtained dewaxed filtrate is recovered through oil recovery to obtain dewaxed oil and ketonebenzene dewaxing recovery solvent, and the freezing point of the dewaxed oil is -24 ℃, and the yield is 85 %.

[0052] 2) one-stage deoiling: the second ketonebenzene d...

Embodiment 2

[0059] A kind of ketone-benzene dewaxing process of low wax content raw material, comprises the steps:

[0060] 1) Dewaxing: the first ketonebenzene dewaxing solvent dilutes the low-wax raw material three times and then carries out cold washing, and is filtered and separated to obtain dewaxing filtrate and oil-containing wax liquid; the wax content of the low-wax raw material is 7wt%, and the feed temperature is 0°C; the primary ratio is 0.50; the secondary ratio is 2.5; the tertiary ratio is 3.0; the cold wash ratio is 0.5, and the cold wash temperature is -15°C; 7wt%, the flash point is 167°C, and the freezing point is 9°C; the obtained dewaxed filtrate is recovered through oil recovery to obtain dewaxed oil and ketonebenzene dewaxing recovery solvent, the freezing point of the dewaxed oil is -23°C, and the yield is 83%.

[0061] 2) one-stage deoiling: the second ketonebenzene dewaxing solvent first dilutes the oily wax liquid obtained in step 1) and then carries out cold wa...

Embodiment 3

[0068] A kind of ketone-benzene dewaxing process of low wax content raw material, comprises the steps:

[0069] 1) Dewaxing: the first ketonebenzene dewaxing solvent dilutes the low-wax raw material three times and then carries out cold washing, and is filtered and separated to obtain dewaxing filtrate and oil-containing wax liquid; the wax content of the low-wax raw material is 5wt%, and the feed temperature is 20°C; the first ratio is 2.0; the second ratio is 0.5; the third ratio is 0.5; the cold wash ratio is 2.0, and the cold wash temperature is -10°C; 5wt%, the flash point is 157°C, and the freezing point is 9°C; the obtained dewaxed filtrate is recovered through oil recovery to obtain dewaxed oil and ketonebenzene dewaxing recovery solvent, the freezing point of the dewaxed oil is -22°C, and the yield is 84%.

[0070] 2) one-stage deoiling: the second ketonebenzene dewaxing solvent first dilutes the oily wax liquid obtained in step 1) and then carries out cold washing, a...

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Abstract

The invention relates to a ketone-benzene dewaxing process for raw materials with low wax content. The ketone-benzene dewaxing process includes the following steps: 1) dewaxing: mixing the low-wax raw material with the first ketone-benzene dewaxing solvent, filtering and separating to obtain the dewaxing filtrate and oily wax liquid; 2) one-stage deoiling: mixing the oily wax After mixed with the second ketone-benzene dewaxing solvent, it is divided into the first oil-containing wax liquid and the second oil-containing wax liquid, and the mass ratio is 50~70:30~50; The second oil-containing wax liquid and the third ketone-benzene dewaxing solvent are mixed and divided into the third oil-containing wax liquid and the fourth oil-containing wax liquid, the mass ratio is 40~60:40~60, and the third oil-containing wax liquid is filtered and separated to obtain the second stage Deoiling filtrate and second stage oily wax liquid. The ketone-benzene dewaxing process of the invention can process low-wax raw materials, the process runs stably and dewaxed oil with a qualified freezing point is obtained, and a ketone-benzene dewaxing process for low-waxy raw materials is provided.

Description

technical field [0001] The invention relates to the technical field of ketone-benzene dewaxing, in particular to a ketone-benzene dewaxing process for raw materials with low wax content. Background technique [0002] As petroleum is used to produce lubricating oil, dewaxing is required. The dewaxing method used earlier is to let the cooled raw oil form wax crystals in the tank in winter, and the crystals settle at the bottom of the tank. People use The low freezing point oil with less wax in the upper layer is the so-called freeze sedimentation method. This dewaxing method was later developed into cold pressing dewaxing, that is, putting the raw oil into the equipment and using a refrigerant to replace the natural freezing in the past, and then using mechanical pressing to produce dewaxed oil. [0003] With the development of production, people need lubricating oil with higher viscosity. To produce this kind of lubricating oil, because the viscosity of the raw material is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G73/22C10G73/23C10M177/00
CPCC10G73/22C10M177/00
Inventor 章卫民陶小奇刘海龙林荣兴周高斐薛骏
Owner CHINA PETROLEUM & CHEM CORP