CN1401674A - Process and apparatus for continuous photooxidation preparing polyperfluoromethylethyl ether oil - Google Patents
Process and apparatus for continuous photooxidation preparing polyperfluoromethylethyl ether oil Download PDFInfo
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- CN1401674A CN1401674A CN 02130438 CN02130438A CN1401674A CN 1401674 A CN1401674 A CN 1401674A CN 02130438 CN02130438 CN 02130438 CN 02130438 A CN02130438 A CN 02130438A CN 1401674 A CN1401674 A CN 1401674A
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Abstract
A process for continuously preparing polyperfluoromethylethyl ether oil by optical oxidizing method includes continuously flowing tetrafluoro ethene and O2 gas into optical polymerizer containing bifluorodichloro methane, providing low temp environment by refrigerator set, continuous optical oxidizing-polymerizing reaction at -60 - -20 deg.C under radiation of ultraviolet lamp, dischargint the resultant to radiating reactor, radiating and heating by ultraviolet lamp, and returning the bifluorodichloro methane, low-molecular polymer and unreacted substance back to said polymerizer.
Description
Technical Field
The invention relates to a preparation method of poly (perfluoromethyl ethyl ether) oil, in particular to a continuous photooxidation preparation method of poly (perfluoromethyl ethyl ether) oil.
The invention also relates to a device for the preparation method.
Background
The poly perfluoromethyl ethyl ether oil takes tetrafluoroethylene and oxygen as raw materials, the action of ultraviolet light is to activate the oxygen at low temperature to form ozone, and the ozone oxidizes the tetrafluoroethylene to form poly methyl ethyl ether and a peroxide polymer. The content of the peroxide polymer exceeds 0.1%. Such substances are easy to explode when being impacted or heated, and bring great potential safety hazard to the post-treatment work of reaction products.
Disclosure of Invention
The invention aims to provide a continuous photooxidation preparation method of poly (perfluoromethyl ethyl ether) oil.
It is a further object of the present invention to provide an apparatus for use in the above preparation method.
The invention solves the problem of explosion caused by the existence of peroxide, and ensures that the reaction becomes safe and stable.
The technical scheme adopted by the invention for realizing the purpose is as follows: tetrafluoroethylene and oxygen are taken as raw materials, introduced into a photopolymerization kettle filled with sufficient solvent difluoro dichloromethane (F12), and under the irradiation of an ultraviolet lamp, the continuous photooxidation polymerization reaction is carried out in a low-temperature environment. The reactants are put into a lighting kettle from the photopolymerization kettle and are subjected to distillation and ultraviolet lamp irradiation, the finished product is discharged and stored, and the solvent F12, the low molecular polymer and the unreacted substances return to the photopolymerization kettle again to continue to react. The temperature of the light kettle can be adjusted according to the fraction composition of the desired synthesized product, and the light kettle has another function of reducing the content of the peroxide polymer in the product.
The reaction temperature of the invention is-60 to-20 ℃, the recommended reaction temperature is-35 to-45 ℃, and the low-temperature environment is supplied by a refrigerating unit. The power of the adopted ultraviolet lamp is 0.1-4Kw, 1-2Kw is recommended, and the effective wavelength is 2000-3000. The flow rate of tetrafluoroethylene is 1-10L/min, preferably 2-4L/min, the flow rate of oxygen is 1-12L/min, preferably 4-5L/min, the synthesis speed is 0.2kg/h, the temperature of the illumination kettle can be set by a producer according to the fraction composition of the required polymer, and the invention preferably has the temperature of 50-65 ℃. At this temperature, the fraction of the resulting synthesis product having a boiling point above 65 ℃ and atmospheric pressure is increased to over 90%.
The synthetic product of the invention is crude oil of poly (perfluoromethyl ethyl ether), the chemistry of whichThe reaction formula is as follows:
refining the crude oil to obtain finished product oil of poly (perfluoromethyl ethyl ether), wherein the chemical expression is
CF3-O-(-CF-CF2-O)P(-CF2-O)Q-CF2H
Wherein A is-COF or-COOH; p, Q is an integer.
The device for the preparation method provided by the invention is characterized in that the discharge hole of the photopolymerization kettle is connected with the feed inlet of the illumination kettle, and the gas outlet of the illumination kettle is connected with the feed inlet of the photopolymerization kettle.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
Please refer to fig. 1. The temperature of the photopolymerization kettle adopted in the embodiment is-35 to-45 ℃, and the low-temperature environment is provided by 2 13Kw cascade refrigeration units. The structure of the light polymerization kettle is the same as that of the traditional intermittent reaction kettle, the power of an ultraviolet lamp is 2Kw, and the effective wavelength is 3000A. Using F12 as a solvent, smoothly introducing 3L/min of tetrafluoroethylene and 4-5L/min of oxygen into a photopolymerisation kettle, and discharging a reaction product into the photopolymerisation kettle at an average speed of 0.2 kg/h.
In fact, the light-irradiation kettle is a known device, and the structure and the working principle thereof are not described in detail. And (3) continuously irradiating the synthetic product for 24 hours in an illumination kettle at the temperature of 50-65 ℃ by using a 2Kw ultraviolet lamp, and decomposing a great amount of peroxide polymer in the synthetic product by using ultraviolet light to form the poly (perfluoromethyl ethyl ether) at the temperature of 50-65 ℃. The synthesis product is then discharged for storage for further processing. So that on the one hand, the solvent F12and the atmospheric fraction with the boiling point lower than 65 ℃ and the substances which are not completely reacted are returned to the photopolymerization kettle to be condensed to continue to participate in the reaction. On the other hand, the content of the peroxide is greatly reduced due to the irradiation of the ultraviolet light, and generally after the irradiation of 24 hours, the content of the peroxide is less than 0.1 percent, and the synthesized product becomes safe and stable.
The invention can set the temperature of the light polymerization kettle and the light irradiation kettle according to the requirement of a producer, and directionally synthesize the product, namely, the composition of the fraction of the synthesized product is controlled to a small range. The product yield is greatly improved.
Claims (8)
1. A continuous photooxidation preparation method of poly (perfluoromethyl ethyl ether) oil is characterized in that tetrafluoroethylene and oxygen are used as raw materials, continuously introduced into a photopolymerization kettle filled with a solvent of difluorodichloromethane, and subjected to continuous photooxidation polymerization reaction in a low-temperature environment under the irradiation of an ultraviolet lamp; putting reactants into a light irradiation kettle from a photopolymerization kettle, distilling and irradiating by an ultraviolet lamp, and returning a solvent, a fraction with the boiling point lower than 65 ℃/normal pressure and an un-synthesized raw material into the photopolymerization reaction kettle to continuously participate in the reaction;
the flow rate of the tetrafluoroethylene is 1-10L/min; the oxygen flow is 1-12L/min;
the reaction temperature of the photopolymerization kettle is-60 to-20 ℃;
the power of the ultraviolet lamp is 0.1-4 Kw; the effective wavelength is 2000-3000A;
the temperature of the illumination kettle is adjusted according to the molecular weight of the synthesized product;
the discharging speed of the reactants from the photopolymerization kettle is 0.1 to 0.3 Kg/h.
2. The method according to claim 1, wherein the tetrafluoroethylene flow rate is 2 to 4L/min; the flow rate of oxygen is 4-5L/min.
3. The process according to claim 1, wherein the photopolymerization kettle temperature is from-35 ℃ to-45 ℃.
4. The method of claim 1 or 3, wherein the photopolymerization kettle temperature is supplied by a freezer unit.
5. The freezer of claim 4 being a cascade freezer unit.
6. The method of claim 1, wherein the uv lamp power is 1-2 Kw.
7. The method of claim 1, wherein the light kettle temperature is 50-65 ℃.
8. The device for the preparation method of claim 1, wherein the discharge port of the photopolymerization kettle is connected with the feed port of the illumination kettle, and the gas outlet of the illumination kettle is connected with the feed port of the photopolymerization kettle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021304386A CN1176959C (en) | 2002-08-19 | 2002-08-19 | Process and apparatus for continuous photooxidation preparing polyperfluoromethylethyl ether oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021304386A CN1176959C (en) | 2002-08-19 | 2002-08-19 | Process and apparatus for continuous photooxidation preparing polyperfluoromethylethyl ether oil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1401674A true CN1401674A (en) | 2003-03-12 |
| CN1176959C CN1176959C (en) | 2004-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021304386A Expired - Fee Related CN1176959C (en) | 2002-08-19 | 2002-08-19 | Process and apparatus for continuous photooxidation preparing polyperfluoromethylethyl ether oil |
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| CN (1) | CN1176959C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114507340A (en) * | 2020-11-17 | 2022-05-17 | 中昊晨光化工研究院有限公司 | Perfluoropolyether and preparation method thereof |
| CN114621427A (en) * | 2020-12-11 | 2022-06-14 | 成都晨光博达新材料股份有限公司 | Production process for preparing perfluoropolyether with peroxide by photo-oxidative polymerization |
-
2002
- 2002-08-19 CN CNB021304386A patent/CN1176959C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114507340A (en) * | 2020-11-17 | 2022-05-17 | 中昊晨光化工研究院有限公司 | Perfluoropolyether and preparation method thereof |
| CN114507340B (en) * | 2020-11-17 | 2023-06-23 | 中昊晨光化工研究院有限公司 | Perfluoropolyether and preparation method thereof |
| CN114621427A (en) * | 2020-12-11 | 2022-06-14 | 成都晨光博达新材料股份有限公司 | Production process for preparing perfluoropolyether with peroxide by photo-oxidative polymerization |
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| Publication number | Publication date |
|---|---|
| CN1176959C (en) | 2004-11-24 |
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Owner name: CHINA PETROLEUM & CHEMICAL CORPORATION Free format text: FORMER OWNER: CHANGCHENG LUBRICATING OIL GROUP CO., LTD., CHINA PETROCHEMICAL CORP. Effective date: 20061229 |
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Effective date of registration: 20061229 Address after: 100029, No. 6, Xin Xin Street East, Beijing, Chaoyang District Patentee after: Sinopec Corp. Address before: 100085, No. six, Anning West Road, Beijing, Haidian District Patentee before: Changcheng Lubricant Oil Group Corp., ltd., SINOPEC |
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Granted publication date: 20041124 Termination date: 20100819 |