CN113083818B - Processing method for cleaning and recycling polytetrafluoroethylene reaction kettle - Google Patents
Processing method for cleaning and recycling polytetrafluoroethylene reaction kettle Download PDFInfo
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- CN113083818B CN113083818B CN202110337312.1A CN202110337312A CN113083818B CN 113083818 B CN113083818 B CN 113083818B CN 202110337312 A CN202110337312 A CN 202110337312A CN 113083818 B CN113083818 B CN 113083818B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/087—Cleaning containers, e.g. tanks by methods involving the use of tools, e.g. brushes, scrapers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Detergent Compositions (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method for cleaning and recycling a polytetrafluoroethylene reaction kettle, which combines the functions of ethyl acetate washing, organic acid washing, hydrofluoric acid washing and dispersing auxiliary agent dissolution assisting, and photoreduction treatment and chemical reagent reduction treatment to remove stubborn dirt of the polytetrafluoroethylene reaction kettle.
Description
Technical Field
The invention relates to the technical field of reaction kettle cleaning, in particular to a processing method for cleaning and recycling a polytetrafluoroethylene reaction kettle.
Background
The reaction kettle is a reaction vessel which realizes heating, evaporation, cooling and low-speed mixing functions required by the process by configuring and designing the structure and parameters of the vessel, is widely applied to the fields of petroleum, chemical engineering, rubber, pesticides, dyes, medicines, foods and the like, and is often used for completing the technological processes of vulcanization, nitration, hydrogenation, alkylation, polymerization, condensation and the like. In the chemical synthesis reaction experiment, the reaction kettle frequently used is a set of reaction kettle combined by a stainless steel outer lining reaction kettle and a polytetrafluoroethylene inner lining reaction kettle, the kettle inner lining has the advantages of high temperature resistance, corrosion resistance, non-adhesion, non-toxicity, insulation and the like, and is often used as a reaction container for chemical synthesis. However, in frequent chemical material synthesis experiments, the inner lining of the reaction kettle is inevitably adhered with a layer of chemical residues and is difficult to clean and scrape. The most common cleaning method in the laboratory is to use aqua regia for soaking or hot boiling, although partial chemical residues can be removed, the inner wall is easily dyed yellow and the reaction kettle is caused to be in an acid environment, if the reaction kettle is continuously used for carrying out other chemical synthesis experiments, the problems of inaccurate synthesis and even synthesis pollution are caused, and the cost is high and the practical significance is not realized because a new reaction kettle is used in each chemical synthesis experiment.
Disclosure of Invention
In order to solve the problems that a polytetrafluoroethylene lining reaction kettle is easy to dye and chemical substances remain, the invention provides a cleaning and recycling treatment method of the polytetrafluoroethylene lining reaction kettle, which adopts the technical scheme that the method comprises the following steps:
(1) firstly, collecting a polluted polytetrafluoroethylene reaction kettle, soaking the polluted polytetrafluoroethylene reaction kettle in 10% ethyl acetate solution for 1-3 hours, then repeatedly brushing the inner wall and the outer wall of the reaction kettle for 1-3 times, and then flushing the reaction kettle with tap water; then transferring the reaction kettle to an ultrasonic machine filled with organic acid/polyethylene glycol-400 mixed solution for ultrasonic cleaning for 0.5-3 h; then, the organic acid solution in the ultrasonic machine is changed into deionized water, and the ultrasonic cleaning is continued for 2 to 4 times, and each time lasts for 0.5 to 1 hour;
(2) taking out the polytetrafluoroethylene reaction kettle cleaned in the step (1), pouring 1-8% hydrofluoric acid liquid with the volume of about two thirds of the volume of the inner lining of the reaction kettle into the reaction kettle, adding sodium hexametaphosphate, performing ultrasonic dispersion for 10-30min, sealing, installing the outer lining of the reaction kettle, and heating in an oven; washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 2-5 times, and transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 2-3 times, wherein each time lasts for 0.5 h;
(3) taking out the polytetrafluoroethylene reaction kettle cleaned in the step (2), pouring the polytetrafluoroethylene reaction kettle into a mixed solution of urea and sodium borohydride with about two thirds of the volume of the inner lining of the reaction kettle, and then placing the reaction kettle under a xenon lamp light source for illumination reduction for 1-6 h; then washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 2-5 times, transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 2-3 times, each time for 0.5h, finally placing the polytetrafluoroethylene reaction kettle in a drying oven at 50-60 ℃ for drying, and storing the polytetrafluoroethylene reaction kettle in a cool and dry place for later use.
Preferably, the technical solution further comprises part or all of the following technical features:
preferably, the organic acid in step (1) is one or more of citric acid, organic phosphonic acid, ethylenediamine tetraacetic acid, formic acid, sulfamic acid and oxalic acid, wherein the organic phosphonic acid is one of hydroxyethylidene diphosphonic acid, amino trimethylphosphinic acid and ethylenediamine tetramethylphosphinic acid.
Preferably, the volume ratio (10-20) of the organic acid to the polyethylene glycol-400 in the step (1) is 1, wherein the mass fraction of the organic acid solution is 5-15%.
Preferably, the mass-to-volume ratio of the sodium hexametaphosphate to the hydrofluoric acid solution in the step (2) is (0.1-0.5) g (50-100) mL.
Preferably, the ultrasound in step (1) or step (2) or step (3) is washing at a temperature range of 55-80 ℃ and a frequency of 80-120 kHz.
Preferably, the heating in step (2) is performed at 160 ℃ for 3-6 h.
Preferably, the concentration of the mixed solution of urea and sodium borohydride in the step (3) is (5-50) g/L, wherein the mass ratio of urea to sodium borohydride is (1-49) to (4-49).
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) according to the invention, firstly, ethyl acetate is used for roughly washing oil stains on the inner wall and the outer wall of the polytetrafluoroethylene reaction kettle, then an organic acid solvent and polyethylene glycol-400 are used for assisting washing, organic matters and metal ions are further dissolved, the organic matters and the metal ions specifically comprise hydrocarbons, halogenated hydrocarbons and metal ions such as calcium, magnesium, iron and copper, wherein the polyethylene glycol-400 can play a role in assisting dissolution and improving the solvent permeability in the washing process, and further the removal speed of the dirt on the inner wall of the reaction kettle is accelerated.
(2) According to the invention, the polytetrafluoroethylene reaction kettle is subjected to heat treatment by using hydrofluoric acid liquid and sodium hexametaphosphate subsequently, so that chemical residual inorganic matters can be further removed, wherein sodium hexametaphosphate is used as an auxiliary agent and can play roles in assisting dissolution, diffusion and dispersion, and the dissolution and permeability of hydrofluoric acid on dirt on the inner wall of the reaction kettle can be improved; the method also treats the inner lining of the polytetrafluoroethylene reaction kettle by using the mixed solution of urea and sodium borohydride under the illumination of a xenon lamp, and can effectively dissolve out dirt such as stubborn metal ions on the inner wall through double-effect cooperation of photoreduction reaction and reduction of chemical reagents so as to realize comprehensive descaling of the reaction kettle.
(3) In the process of cleaning the lining of the polytetrafluoroethylene reaction kettle, the steps of washing with deionized water and ultrasonic cleaning are frequently used, which is not only beneficial to removing dirt, but also provides a neutral environment for the treatment of the polytetrafluoroethylene reaction kettle, and in the step of photoreduction cleaning, the added mixed solution of urea and sodium borohydride can solve the problem of the acid enhancement of the reaction kettle in the acid cleaning process in the previous step, and further neutralize the pH value of the lining of the reaction kettle.
Detailed Description
To further clarify the disclosure, features and advantages of the present invention, reference will now be made to the following examples and to the accompanying drawings.
Example 1
A processing method for cleaning and recycling a polytetrafluoroethylene reaction kettle comprises the following steps:
(1) firstly, collecting a polluted polytetrafluoroethylene reaction kettle, soaking the polluted polytetrafluoroethylene reaction kettle in 10% ethyl acetate solution for 2 hours, then repeatedly brushing the inner wall and the outer wall of the reaction kettle for 3 times, and then flushing the reaction kettle with tap water; then transferring the reaction kettle to an ultrasonic machine filled with 1L of 9% citric acid/polyethylene glycol-400 mixed solution, and ultrasonically cleaning for 2h at 60 ℃; then, the citric acid/polyethylene glycol-400 mixed solution in the ultrasonic machine is changed into deionized water, and the ultrasonic cleaning is continued for 3 times, and each time lasts for 0.5 hour;
(2) taking out the polytetrafluoroethylene reaction kettles cleaned in the step (1), pouring 60mL of 6% hydrofluoric acid solution into each reaction kettle, adding 0.25g of sodium hexametaphosphate, ultrasonically dispersing for 20min, sealing, installing the outer linings of the reaction kettles, and heating in an oven at 140 ℃ for 5 h; then washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 3 times, and transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 3 times, wherein each time lasts for 0.5 hour;
(3) taking out the polytetrafluoroethylene reaction kettle cleaned in the step (2), pouring 35g/L of mixed solution of urea and sodium borohydride, which accounts for two thirds of the volume of the inner liner of the reaction kettle, into the reaction kettle, and then placing the reaction kettle under a xenon lamp light source for illumination reduction for 6 hours; then washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 3 times, transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 3 times, wherein each time lasts for 0.5h, and finally placing the polytetrafluoroethylene reaction kettle in a drying oven at 60 ℃ for drying and storing the polytetrafluoroethylene reaction kettle in a cool and dry place for later use.
Example 2
A processing method for cleaning and recycling a polytetrafluoroethylene reaction kettle comprises the following steps:
(1) firstly, collecting a polluted polytetrafluoroethylene reaction kettle, soaking the polluted polytetrafluoroethylene reaction kettle in 10% ethyl acetate solution for 2 hours, then repeatedly brushing the inner wall and the outer wall of the reaction kettle for 3 times, and then flushing the reaction kettle with tap water; then transferring the reaction kettle to an ultrasonic machine filled with 1L of 8% sulfamic acid/ethylenediamine tetramethylphosphinic acid liquid citric acid/polyethylene glycol-400 mixed liquid, and ultrasonically cleaning for 2h at 60 ℃; then, exchanging the sulfamic acid/ethylenediamine tetramethylphosphinic acid solution citric acid/polyethylene glycol-400 mixed solution in the ultrasonic machine with deionized water, and continuing to perform ultrasonic cleaning for 3 times, wherein each time lasts for 0.5 hour;
(2) taking out the polytetrafluoroethylene reaction kettles cleaned in the step (1), pouring 60mL of 6% hydrofluoric acid solution into each reaction kettle, adding 0.3g of sodium hexametaphosphate, ultrasonically dispersing for 20min, sealing, installing the outer linings of the reaction kettles, and heating in an oven at 140 ℃ for 5 h; then washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 3 times, and transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 3 times, wherein each time lasts for 0.5 hour;
(3) taking out the polytetrafluoroethylene reaction kettle cleaned in the step (2), pouring 35g/L of mixed solution of urea and sodium borohydride, which accounts for two thirds of the volume of the inner liner of the reaction kettle, into the reaction kettle, and then placing the reaction kettle under a xenon lamp light source for illumination reduction for 4 hours; then washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 3 times, transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 3 times, wherein each time lasts for 0.5h, and finally placing the polytetrafluoroethylene reaction kettle in a drying oven at 60 ℃ for drying and storing the polytetrafluoroethylene reaction kettle in a cool and dry place for later use.
Example 3
A processing method for cleaning and recycling a polytetrafluoroethylene reaction kettle comprises the following steps:
(1) firstly, collecting a polluted polytetrafluoroethylene reaction kettle, soaking the polluted polytetrafluoroethylene reaction kettle in 10% ethyl acetate solution for 2 hours, then repeatedly brushing the inner wall and the outer wall of the reaction kettle for 3 times, and then flushing the reaction kettle with tap water; then transferring the reaction kettle to an ultrasonic machine filled with 1L of 5% citric acid/polyethylene glycol-400 mixed solution, and ultrasonically cleaning for 2 hours at 60 ℃; then, the citric acid/polyethylene glycol-400 mixed solution in the ultrasonic machine is changed into deionized water, and ultrasonic cleaning is continued for 3 times, and each time lasts for 0.5 hour;
(2) taking out the polytetrafluoroethylene reaction kettles cleaned in the step (1), pouring 60mL of 5% hydrofluoric acid solution into each reaction kettle, adding 0.1g of sodium hexametaphosphate, ultrasonically dispersing for 20min, sealing, installing the outer linings of the reaction kettles, and heating in an oven at 140 ℃ for 5 h; then washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 3 times, and transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 3 times, wherein each time lasts for 0.5 hour;
(3) taking out the polytetrafluoroethylene reaction kettle cleaned in the step (2), pouring 35g/L of mixed solution of urea and sodium borohydride, which accounts for two thirds of the volume of the inner liner of the reaction kettle, into the reaction kettle, and then placing the reaction kettle under a xenon lamp light source for illumination reduction for 2 hours; then washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 3 times, transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 3 times, wherein each time lasts for 0.5h, and finally placing the polytetrafluoroethylene reaction kettle in a drying oven at 60 ℃ for drying and storing the polytetrafluoroethylene reaction kettle in a cool and dry place for later use.
Comparative example 1
The method for treating the polytetrafluoroethylene reaction kettle according to the comparative example 1 of the invention comprises the steps of directly soaking the reaction kettle in aqua regia, washing the reaction kettle for 3 to 5 times by deionized water after soaking for 5 hours, and drying the reaction kettle for later use.
Comparative example 2
The method for treating the polytetrafluoroethylene reaction kettle in the comparative example 2 comprises the steps of boiling the reaction kettle for 5 hours by using aqua regia, then washing the reaction kettle for 3 to 5 times by using deionized water, and drying the reaction kettle for later use.
The collected dirty ptfe reactor liners were cleaned and evaluated using the methods of the present invention, examples 1, 3, and comparative examples 1-2, respectively, with specific feedback as shown in tables 1 and 2.
Table 1: cleaning feedback for polytetrafluoroethylene reactor liners
And respectively pouring two thirds of deionized water into the cleaned polytetrafluoroethylene reaction kettle, then buckling the outer cover, placing the reaction kettle in an ultrasonic machine, carrying out ultrasonic treatment at 75 ℃ for 0.5h, and immediately detecting the pH value of the deionized water by using a pH meter after the ultrasonic treatment is finished.
Table 2: pH of the cleaned polytetrafluoroethylene reactor liner
| Item | Example 1 | Example 3 | Comparative example 1 | Comparative example 2 |
| pH | 7.2 | 6.7 | 5.8 | 3.7 |
In conclusion, the treatment method for cleaning and recycling the polytetrafluoroethylene reaction kettle provided by the invention has an effective cleaning effect on the polytetrafluoroethylene reaction kettle, is moderate in acidity and alkalinity after cleaning, keeps the inner wall white and can be recycled.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. Such modifications and variations are considered to be within the scope of the invention.
Claims (7)
1. A method for cleaning and recycling a polytetrafluoroethylene reaction kettle, which is characterized by comprising the following steps:
(1) firstly, collecting a polluted polytetrafluoroethylene reaction kettle, soaking the polluted polytetrafluoroethylene reaction kettle in 10% ethyl acetate solution for 1-3 hours, repeatedly brushing the inner wall and the outer wall of the reaction kettle for 1-3 times, and then washing the reaction kettle with tap water; then transferring the reaction kettle to an ultrasonic machine filled with organic acid and polyethylene glycol-400 mixed solution for ultrasonic cleaning for 0.5-3 h; then, the mixed liquid of the organic acid and the polyethylene glycol-400 in the ultrasonic machine is changed into deionized water, and the ultrasonic cleaning is continued for 2 to 4 times, and each time lasts for 0.5 to 1 hour;
(2) taking out the polytetrafluoroethylene reaction kettle cleaned in the step (1), pouring 1-8% hydrofluoric acid solution with the volume of about two thirds of the inner liner of the reaction kettle into the reaction kettle, adding sodium hexametaphosphate, performing ultrasonic dispersion for 10-30min, sealing, mounting the outer liner of the reaction kettle, and heating in an oven; washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 2-5 times, and transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 2-3 times, wherein each time lasts for 0.5 h;
(3) taking out the polytetrafluoroethylene reaction kettle cleaned in the step (2), pouring the polytetrafluoroethylene reaction kettle into a mixed solution of urea and sodium borohydride with about two thirds of the volume of the inner lining of the reaction kettle, and then placing the reaction kettle under a xenon lamp light source for illumination reduction for 1-6 h; then washing the inner liner of the polytetrafluoroethylene reaction kettle with deionized water for 2-5 times, transferring the inner liner into an ultrasonic machine filled with deionized water for ultrasonic treatment for 2-3 times, each time for 0.5h, finally placing the polytetrafluoroethylene reaction kettle in a drying oven at 50-60 ℃ for drying, and storing the polytetrafluoroethylene reaction kettle in a cool and dry place for later use.
2. The treatment method according to claim 1, wherein the organic acid in step (1) is one or more of citric acid, organic phosphonic acid, ethylene diamine tetraacetic acid, formic acid, sulfamic acid and oxalic acid, and the organic phosphonic acid is one of hydroxyethylidene diphosphonic acid, amino trimethylphosphinic acid and ethylene diamine tetra methylphosphinic acid.
3. The treatment method according to claim 1, wherein the volume ratio (10-20) of the organic acid to the polyethylene glycol-400 in the step (1) is 1, and the mass fraction of the mixed solution of the organic acid and the polyethylene glycol-400 is 5-15%.
4. The method according to claim 1, wherein the mass-to-volume ratio of sodium hexametaphosphate to hydrofluoric acid solution in step (2) is (0.1-0.5) g (50-100) mL.
5. The process according to claim 1, characterized in that the ultrasound of step (1) or of step (2) or of step (3) is a washing carried out at a temperature range of 55-80 ℃ and a frequency of 80-120 kHz.
6. The treatment method as claimed in claim 1, wherein the heating in step (2) is performed at 160 ℃ for 3-6 h.
7. The treatment method as claimed in claim 1, wherein the concentration of the mixed solution of urea and sodium borohydride in the step (3) is (5-50) g/L, and the mass ratio of urea to sodium borohydride is (1-49) to (4-49).
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| TW465053B (en) * | 1998-03-25 | 2001-11-21 | Daikin Ind Ltd | Method for washing fluorine-containing rubber molded article for semiconductor manufacturing equipment and washed molded article |
| JP2003347263A (en) * | 2002-05-28 | 2003-12-05 | Shinetsu Quartz Prod Co Ltd | Quartz glass tank for ultrasonic cleaning for use in manufacturing of semiconductor and manufacture thereof, and cleaning method using the quartz glass tank for ultrasonic cleaning |
| ES2752079T3 (en) * | 2011-05-20 | 2020-04-02 | Ecolab Usa Inc | Acidic formulations for use in a utensil washing system |
| CN204550061U (en) * | 2015-04-17 | 2015-08-12 | 四川迪美特生物科技有限公司 | Kettle device is washed in a kind of phosphorus trichloride production technique |
| CN105957800B (en) * | 2016-05-09 | 2018-11-06 | 浙江海洋大学 | A kind of process of surface treatment of substrate |
| WO2017208767A1 (en) * | 2016-06-03 | 2017-12-07 | 富士フイルム株式会社 | Treatment liquid, substrate cleaning method and method for removing resist |
| CN106110895B (en) * | 2016-08-08 | 2020-02-07 | 同济大学 | Method for cleaning ultrafiltration membrane in membrane method polymer flooding oil extraction wastewater treatment |
| EP3424550A1 (en) * | 2017-07-06 | 2019-01-09 | Monatomics Technology | Gas mixtures containing low concentrations of xenon and argon provide neuroprotection without inhibiting the catalytic activity of thrombolytic agents |
| JP7294859B2 (en) * | 2019-04-11 | 2023-06-20 | 東京応化工業株式会社 | Cleaning solution and method for cleaning support provided with metal resist |
| CN111711048B (en) * | 2020-06-29 | 2021-05-25 | 辽宁红德电碳制品有限公司 | Brush production line |
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Effective date of registration: 20230530 Address after: No. 1, South of Haohua East Road, North Park, Neiqiu Industrial Park, Neiqiu County, Xingtai City, Hebei Province, 054200 Patentee after: Hebei zhongtianqing Technology Co.,Ltd. Patentee after: Beijing Zhongtian Lanqing Environmental Technology Co.,Ltd. Address before: No. 1, South of Haohua East Road, North Park, Neiqiu County Industrial Park, Xingtai City, Hebei Province, 054000 Patentee before: Hebei zhongtianqing Technology Co.,Ltd. |
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