CN114058403A - Method for purifying white oil in lithium battery diaphragm industry - Google Patents
Method for purifying white oil in lithium battery diaphragm industry Download PDFInfo
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- CN114058403A CN114058403A CN202111201383.5A CN202111201383A CN114058403A CN 114058403 A CN114058403 A CN 114058403A CN 202111201383 A CN202111201383 A CN 202111201383A CN 114058403 A CN114058403 A CN 114058403A
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- white oil
- tank
- lithium battery
- storage tank
- filter
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G53/00—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes
- C10G53/02—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only
- C10G53/08—Treatment of hydrocarbon oils, in the absence of hydrogen, by two or more refining processes plural serial stages only including at least one sorption step
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/14—White oil, eating oil
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Silicon Compounds (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
Abstract
The invention discloses a method for purifying white oil in lithium battery diaphragm industry, which comprises the following steps: step one, adding white oil to be treated and silicon dioxide into a stirring tank, mixing and stirring the white oil and the silicon dioxide in a vacuum environment, and adsorbing impurities and oxides in the white oil through the silicon dioxide; step two, the white oil after adsorption is firstly put into a temporary storage tank for buffer storage; step three, filtering the adsorbed white oil in a back-flushing filter, wherein the filtering precision of the back-flushing filter is less than or equal to 100 nm; and step four, putting the filtered white oil into a white oil tank for later use. The invention can purify and recover a large amount of white oil, controls different flow rates according to actual needs, is convenient and efficient, can continuously utilize the processed white oil close to the raw oil, and can save a large amount of cost compared with purchasing brand new white oil.
Description
Technical Field
The invention relates to a method for purifying white oil in lithium battery diaphragm industry, and belongs to the field of lithium battery diaphragm production.
Background
The white oil in the lithium battery diaphragm industry is large in usage amount, and after one-time circulation under a high-temperature production condition, impurities and oxides such as polycyclic aromatic hydrocarbons and heterocyclic aromatic hydrocarbons containing sulfur and nitrogen are gradually generated in the white oil, so that the appearance of an oil product is yellow, the acid value is too high, and more impurities and oxides are generated due to more circulation times. If the white oil is continuously used, the appearance and the quality of the product are influenced to a certain extent, but if the white oil is completely replaced by new white oil, the cost is greatly increased.
At present, two types of white oil purification modes in the known lithium battery diaphragm industry exist, one is to abandon and replace the white oil which is circulated for many times with new oil. And the other is to use clay to adsorb impurities and oxides in the white oil and then filter the white oil. The first mode causes high production cost of enterprises and is not sustainable. The second mode is environment-friendly and does not reach the standard, and is difficult to use on a large scale.
Disclosure of Invention
The invention aims to provide a method for purifying white oil in lithium battery diaphragm industry, which solves the problems of complex process and environmental substandard environmental protection of the traditional clay decoloration, and after the circulating white oil is treated by the method, various physical indexes can be close to the level of new white oil.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for purifying white oil in lithium battery diaphragm industry comprises the following steps:
step one, adding white oil to be treated and silicon dioxide into a stirring tank for mixing and stirring, and adsorbing impurities and oxides in the white oil through the silicon dioxide;
step two, filtering the adsorbed white oil in a back-flushing filter, wherein the filtering precision of the back-flushing filter is less than or equal to 100 nm;
and step three, putting the filtered white oil into a white oil tank for later use.
Further, the mass portion ratio of the white oil to be treated to the silicon dioxide is 9: 1.
Further, the white oil to be treated and the silicon dioxide are mixed and adsorbed in a vacuum environment.
Further, the white oil after adsorption is firstly put into a temporary storage tank and then filtered by a backflushing filter.
Furthermore, the temperature of the backflushing filter is controlled to be less than or equal to 20 ℃ so as to filter small molecular precipitates dissolved in the white oil.
Further, a valve for discharging used silicon dioxide is arranged at the bottom of the stirring tank, and the silicon dioxide is in a fine particle shape.
Further, the stirring tank is connected with a vacuumizing device.
Further, the outside of the backflushing filter is connected with a heat exchanger.
The utility model provides a purification device for realizing above-mentioned white oil purification method, its includes agitator tank, the jar of keeping in, recoil formula filter and white oil holding vessel, agitator tank, the jar of keeping in, recoil formula filter and white oil holding vessel pass through pipeline interconnect in proper order, the agitator tank bottom is equipped with the evacuation valve to the evacuation pump is connected at the agitator tank top, the jar of keeping in is used for the buffer storage as the pans, the recoil formula filter outside is provided with the heat transfer board, controls its operating temperature through the heat transfer board.
Further, be equipped with the visual window of being convenient for observe the liquid level on jar and the white oil holding vessel of keeping in or the jar and the inside liquid level sensing device that sets up of white oil holding vessel of keeping in.
The invention has the beneficial effects that: the invention solves the problems of complex process and substandard environmental protection of the traditional clay decoloring; the invention can purify and recover a large amount of white oil, controls different flow rates according to actual needs, is convenient and efficient, can continuously utilize the processed white oil close to the raw oil, and can save a large amount of cost compared with purchasing brand new white oil.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment.
A method for purifying white oil in lithium battery diaphragm industry comprises the following steps:
step one, adding white oil to be treated and silicon dioxide into a stirring tank for mixing and stirring, and adsorbing impurities and oxides in the white oil through the silicon dioxide;
step two, the white oil after adsorption is firstly put into a temporary storage tank for buffer storage;
step three, filtering the adsorbed white oil in a back-flushing filter, wherein the filtering precision of the back-flushing filter is less than or equal to 100nm, and the back-flushing filter can prevent the filter from being blocked;
and step four, putting the filtered white oil into a white oil tank for later use.
In the embodiment, the mass part ratio of the white oil to be treated to the silicon dioxide is 9: 1; and the white oil to be treated and the silicon dioxide are mixed and adsorbed in a vacuum environment to improve the mixing efficiency, and the silicon dioxide is in a fine particle shape to be discharged in the later period.
In this embodiment, the temperature of the backflushing filter is controlled to 20 ℃ or lower, and since the small-molecule oxide precipitate is dissolved at a high temperature and is difficult to be filtered, the small-molecule substance is crystallized and precipitated at a temperature of 20 ℃ or lower, and physical filtration can be performed by a high-precision filter.
Example two.
The utility model provides a white oil purification device, its includes the agitator tank, keeps in jar, recoil formula filter and white oil holding vessel, the agitator tank, keep in jar, recoil formula filter and white oil holding vessel pass through pipeline interconnect in proper order, the agitator tank bottom is equipped with the evacuation valve to the evacuation pump is connected at the agitator tank top, the jar of keeping in is used for the buffer storage as the pans, the recoil formula filter outside is provided with the heat transfer board, controls its operating temperature through the heat transfer board.
In this embodiment, be equipped with the visual window of being convenient for observe the liquid level on temporary storage tank and the white oil holding vessel or temporary storage tank and the inside liquid level sensing device that sets up of white oil holding vessel.
In conclusion, the method firstly uses the silicon dioxide to adsorb impurities and oxides in the white oil, then filters the impurities and the oxides in the oil product in a filtering way, integrates the functions of impurity removal, decoloration and separation into a whole, so that the oil product which turns yellow and black becomes light-colored transparent liquid, and the physical indexes such as acid value, chroma and the like meet the use standard.
Tests show that the white oil acid value of the stirring tank is more than or equal to 0.17(GBT264-1983) and the chroma is more than or equal to 3 (GB/56540-.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the scope of the present invention in any way, and all technical solutions obtained by using equivalent substitution methods fall within the scope of the present invention.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (10)
1. A method for purifying white oil in lithium battery diaphragm industry is characterized by comprising the following steps:
step one, adding white oil to be treated and silicon dioxide into a stirring tank for mixing and stirring, and adsorbing impurities and oxides in the white oil through the silicon dioxide;
step two, filtering the adsorbed white oil in a back-flushing filter, wherein the filtering precision of the back-flushing filter is less than or equal to 100 nm;
and step three, putting the filtered white oil into a white oil tank for later use.
2. The purification method of white oil in lithium battery separator industry according to claim 1, wherein in the first step, the mass part ratio of the white oil to be treated to the silicon dioxide is 9: 1.
3. The purification method of white oil in lithium battery separator industry according to claim 1 or 2, wherein in the first step, the white oil to be treated and silicon dioxide are subjected to mixed adsorption in a vacuum environment.
4. The method for purifying white oil in lithium battery separator industry according to claim 1, wherein the adsorbed white oil is placed in a temporary storage tank and then filtered through a back-flushing filter.
5. The purification method of white oil in lithium battery separator industry according to claim 1 or 4, wherein the temperature of the back-flushing filter is controlled to be less than or equal to 20 ℃ so as to filter small molecular precipitates dissolved in the white oil.
6. The purification method of white oil in lithium battery separator industry according to claim 1, wherein a valve for discharging used silica is arranged at the bottom of the stirring tank, and the silica is in a fine granular shape.
7. The purification method of white oil in lithium battery separator industry according to claim 1, wherein the stirring tank is connected with a vacuum-pumping device.
8. The lithium battery separator industry white oil purification method according to claim 1, wherein a heat exchanger is connected to the outside of the backflushing filter.
9. A purification device for realizing the white oil purification method in claim 1, which is characterized by comprising an agitator tank, a temporary storage tank, a backflushing filter and a white oil storage tank, wherein the agitator tank, the temporary storage tank, the backflushing filter and the white oil storage tank are sequentially connected with one another through pipelines, the bottom of the agitator tank is provided with an evacuation valve, the top of the agitator tank is connected with a vacuum pump, the temporary storage tank is used as an intermediate tank for buffer storage, and the backflushing filter is externally provided with a heat exchange plate, and the working temperature of the backflushing filter is controlled through the heat exchange plate.
10. The white oil purifying device according to claim 9, wherein the temporary storage tank and the white oil storage tank are provided with visual windows for observing liquid levels conveniently or liquid level sensing devices are arranged inside the temporary storage tank and the white oil storage tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111201383.5A CN114058403A (en) | 2021-10-15 | 2021-10-15 | Method for purifying white oil in lithium battery diaphragm industry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111201383.5A CN114058403A (en) | 2021-10-15 | 2021-10-15 | Method for purifying white oil in lithium battery diaphragm industry |
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| CN114058403A true CN114058403A (en) | 2022-02-18 |
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| CN202111201383.5A Withdrawn CN114058403A (en) | 2021-10-15 | 2021-10-15 | Method for purifying white oil in lithium battery diaphragm industry |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5466364A (en) * | 1993-07-02 | 1995-11-14 | Exxon Research & Engineering Co. | Performance of contaminated wax isomerate oil and hydrocarbon synthesis liquid products by silica adsorption |
| US20090114569A1 (en) * | 2007-11-02 | 2009-05-07 | General Electric Company | Methods for removing metallic and non-metallic impurities from hydrocarbon oils |
| CN203839481U (en) * | 2014-04-29 | 2014-09-17 | 重庆云天化纽米科技有限公司 | White oil recycling system in wet-process lithium battery diaphragm production |
| CN206081882U (en) * | 2016-09-13 | 2017-04-12 | 浙江正信石油科技有限公司 | Recovery system of white oil for lithium battery diaphragm |
| CN108148614A (en) * | 2017-11-27 | 2018-06-12 | 湖北爱国石化有限公司 | A kind of production technology of absorption method production white oil |
-
2021
- 2021-10-15 CN CN202111201383.5A patent/CN114058403A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5466364A (en) * | 1993-07-02 | 1995-11-14 | Exxon Research & Engineering Co. | Performance of contaminated wax isomerate oil and hydrocarbon synthesis liquid products by silica adsorption |
| US20090114569A1 (en) * | 2007-11-02 | 2009-05-07 | General Electric Company | Methods for removing metallic and non-metallic impurities from hydrocarbon oils |
| CN203839481U (en) * | 2014-04-29 | 2014-09-17 | 重庆云天化纽米科技有限公司 | White oil recycling system in wet-process lithium battery diaphragm production |
| CN206081882U (en) * | 2016-09-13 | 2017-04-12 | 浙江正信石油科技有限公司 | Recovery system of white oil for lithium battery diaphragm |
| CN108148614A (en) * | 2017-11-27 | 2018-06-12 | 湖北爱国石化有限公司 | A kind of production technology of absorption method production white oil |
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Application publication date: 20220218 |