CN213434389U - Photocatalytic spiral coil type reactor for preparing polymer-grade ethylene glycol - Google Patents
Photocatalytic spiral coil type reactor for preparing polymer-grade ethylene glycol Download PDFInfo
- Publication number
- CN213434389U CN213434389U CN202022144892.6U CN202022144892U CN213434389U CN 213434389 U CN213434389 U CN 213434389U CN 202022144892 U CN202022144892 U CN 202022144892U CN 213434389 U CN213434389 U CN 213434389U
- Authority
- CN
- China
- Prior art keywords
- spiral coil
- ethylene glycol
- metal casing
- photocatalytic
- mercury lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Physical Water Treatments (AREA)
Abstract
The utility model discloses a photocatalysis spiral coil type reactor for preparing polymer-grade ethylene glycol, including vertical tubulose and sealed metal casing, the bottom of metal casing is equipped with the water inlet of refrigeration cycle water, the top of metal casing is equipped with refrigeration cycle water's delivery port, the metal casing is inside to be equipped with low pressure ultraviolet mercury lamp, low pressure ultraviolet mercury lamp electricity is connected with the controller, low pressure ultraviolet mercury lamp external seal has quartz seal cover pipe, quartz seal cover pipe outer wall cover is equipped with the spiral coil pipe of low absorbance quartz material, the feed end of spiral coil pipe runs through the metal casing bottom and communicates with the charge pump through the tetrafluoro pipe, the discharge end of spiral coil pipe runs through the top of metal casing and communicates with the discharge pump through the tetrafluoro pipe, the discharge pump communicates with the product holding vessel through the pipeline; the scheme has the beneficial effects of high ultraviolet light transmittance, simple process, low cost and high product yield.
Description
Technical Field
The utility model relates to a preparation polymerization level is reaction unit for ethylene glycol, specificly relates to a photocatalysis spiral coil type reactor for preparing polymerization level ethylene glycol.
Background
Ethylene glycol is an important organic chemical raw material and is widely used for producing polyethylene terephthalate (PET), automobile antifreeze fluid, nonionic surfactant, plasticizer and the like. The polymer grade glycol for producing polyester by using the glycol not only occupies more than 90 percent of the total yield, but also the quality specification of the product needs to reach the superior product specified in the national standard of industrial glycol. In recent years, with the rapid increase of the demand of domestic and foreign markets for polyester products, the production scale and production technology of ethylene glycol are rapidly developed, and the technical requirements are obviously improved. At present, the standard of "polymer grade glycol specification" set by the American Society for Testing and Materials (ASTM) specifies the purity requirement of polymer grade glycol, and particularly, in an ultraviolet spectrophotometer, the transmittance at a wavelength of 220nm is required to be higher than 70%, which aims at preventing the uncontrollable product quality caused by noise interference caused by absorbance in the synthesis reaction and other working sections of the polymer grade glycol.
At present, the production method of ethylene glycol mainly adopts a petroleum ethylene method, namely a process route for oxidizing ethylene into ethylene oxide and then hydrolyzing, and the product prepared by the method has high purity and high reaction conversion rate. However, the ultraviolet transmittance of the obtained product is low, and after the product is subjected to common purification processes (rectification, extraction, adsorption and the like), the GC purity is high and the transmittance is increased, but the product still cannot meet the standard of polymer-grade ethylene glycol. The reported purification methods are often a combination of 3 processes including rectification, multi-step reaction, electrochemical method, etc., which results in complex process, high cost, large amount of waste generated in the process and greatly reduced product yield. Therefore, it is needed to design a reactor for preparing polymer-grade ethylene glycol with high ultraviolet transmittance, simple process, low cost and high product yield.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a photocatalysis spiral coil type reactor for preparing polymer grade ethylene glycol, which has high ultraviolet light transmittance, simple process, low cost and high product yield.
In order to solve the above problem, the utility model provides a following technical scheme: the utility model provides a preparation polymerization level photocatalysis spiral coil pipe formula reactor for ethylene glycol, including vertical tubulose and sealed metal casing, metal casing's bottom is equipped with cooling circulation water's water inlet, metal casing's top is equipped with cooling circulation water's delivery port, the inside low pressure ultraviolet mercury lamp that is equipped with of metal casing, low pressure ultraviolet mercury lamp electricity is connected with the controller, low pressure ultraviolet mercury lamp external seal has quartzy sealed tube, quartzy sealed tube outer wall cover is equipped with the spiral coil pipe of low absorbance quartz material, spiral coil pipe's feed end runs through metal casing bottom and through tetrafluoro pipe and feed pump intercommunication, spiral coil pipe's discharge end runs through metal casing's top and through tetrafluoro pipe and discharge pump intercommunication, the discharge pump has the product holding vessel through the pipeline intercommunication.
The ethylene glycol rectification liquid obtained by ethylene oxide hydration is used as a raw material, and the polymer-grade ethylene glycol is prepared by a photocatalysis process; the utility model discloses an operating principle is that the raw materials gets into spiral coil pipe through spiral coil pipe's feed end, the raw materials is along spiral coil pipe spiral rising, at the ascending in-process, light catalysis is carried out through the illumination of low pressure ultraviolet mercury lamp, in the photocatalysis in-process, the material that generates heat because of light catalysis through the cooling circulation water that is located the spiral coil pipe outside is with control product quality, material after the light catalysis sends into sealed product holding vessel through spiral coil pipe's discharge end, whole process is simple, and is low in cost, the ultraviolet luminousness of product yield height and polymer grade ethylene glycol product is high.
Preferably, in order to adapt to spiral coils with different sizes, the technical scheme of the utility model also includes that the inner diameter of the metal shell is 0.25-4m and the height is 3-20 m.
The technical proposal of the utility model also comprises that the inner diameter of the quartz sealing sleeve is 0.2-3.3m, and the thickness is 2-6 mm; the quartz sealing sleeve is used for sealing the low-pressure ultraviolet mercury lamp, so that the circulating water in the metal shell is prevented from damaging or short-circuiting the ultraviolet emitter, and meanwhile, the quartz material can also ensure that the light intensity and wavelength loss of the ultraviolet ray after penetrating through the quartz sealing sleeve are small.
In order to better adapt to the material handling capacity, the light source and the material flow rate, as the optimization, the technical scheme of the utility model also comprises that the total length of the spiral coil is 10-120m, the diameter of the spiral is 0.2-3m, and the pitch is 5-50 mm.
The spiral coil is the passageway that the material passed in and out the reactor and took place the photocatalytic reaction, and the spiral coil material adopts the quartz material of low absorbance, and the purpose avoids the ultraviolet ray to produce the intensity loss when penetrating the pipe wall to can make full wave band ultraviolet catalysis ethylene glycol, promote the catalytic reaction effect.
In order to further improve the efficiency of the photocatalytic reaction, the technical scheme of the utility model also includes that the inner diameter of the coil pipe is 15-100mm, and the thickness of the pipe wall is 2-8 mm.
Preferably, the technical solution of the present invention further includes that the illumination intensity of the low-pressure ultraviolet mercury lamp is 50W-300W/m3The ultraviolet wavelength range emitted by the low-pressure ultraviolet mercury lamp is 180nm-250nm so as to adapt to different pipe wall thicknesses and pipes of the spiral coil pipeShell spacing and material flow.
For promoting the cooling effect, the technical scheme of the utility model still include, metal casing inner wall transversal separation is equipped with stainless steel baffle, and stainless steel baffle staggered arrangement, interval between the adjacent stainless steel baffle are 2m, and stainless steel baffle both can strengthen the fluid turbulence in the shell side, play the water conservancy diversion effect, avoid the metal to be washed away for a long time by flowing water again to make the aquatic produce the transmittance that the metal particle influences water.
For promoting the convenience of this application reactor operation, the technical scheme of the utility model still include, cooling circulation water's water inlet is equipped with valve I, and spiral coil's feed end is equipped with valve II, and spiral coil's discharge end is equipped with valve III, and valve I, valve II, valve III all are connected with the controller electricity. The controller controls each valve and the low-pressure ultraviolet mercury lamp, and when the feeding flow of the photocatalytic spiral coil type reactor is increased, the catalytic reaction process can be accelerated by improving the illumination intensity so as to improve the treatment capacity; when the temperature of the discharged product is higher, the temperature of the material can be reduced by adjusting the flow rate of cooling water; when ultraviolet lamp illumination intensity is not enough, the accessible reduces the material velocity of flow and increases its dwell time in the coil, and control system can guarantee the quality of ethylene glycol product according to the different situations.
The utility model has the advantages that: compared with the prior art, the utility model aims at providing a preparation polymerization level photocatalysis spiral coil type reactor for ethylene glycol that ultraviolet luminousness is high, simple process, with low costs and product yield is high, for realizing above-mentioned technological effect:
firstly, the utility model discloses a low pressure ultraviolet mercury lamp carries out photocatalysis to the ethylene glycol rectification liquid that the cover was established in the spiral coil outside the mercury lamp, and the quartz seal cover pipe outside spiral coil and the mercury lamp is the quartz material, simultaneously, is equipped with cooling water circulation system outside spiral coil, compares with purification technologies such as current rectification, extraction, absorption, the technical scheme simple process of this application, the cost is lower;
secondly, the technical scheme of the application realizes the purification of the ethylene glycol rectification liquid raw material through the ultraviolet light catalysis effect, and compared with the prior art, the method has the advantages of no pollutant and waste, and higher product yield;
finally, verification proves that the ultraviolet transmittance of the discharge product of the photocatalytic spiral coil type reactor for preparing polymer-grade ethylene glycol under the low wavelength of 220nm exceeds 71%, the product yield reaches 99%, and the production problems of low ultraviolet transmittance and more wastes in the prior art are effectively solved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a photocatalytic spiral coil reactor for preparing polymer-grade ethylene glycol according to an embodiment.
Wherein, 1 is metal casing, 2 is stainless steel baffling baffle, 3 is the water inlet, 4 is valve I, 5 is the controller, 6 is the delivery port, 7 is low pressure ultraviolet mercury lamp, 8 is quartz seal tube, 9 is spiral coil pipe, 10 is the tetrafluoro pipe, 11 is the charge pump, 12 is valve II, 13 is the discharge pump, 14 is valve III, 15 is the product holding vessel.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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.
In the description of the present invention, it is to be understood that the terms "central," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are for simplicity of description, and are not intended to indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting.
Example 1
The utility model provides a preparation polymerization level photocatalysis spiral coil tubular reactor for ethylene glycol, includes vertical tubulose and sealed metal casing 1, and the internal diameter of metal casing 1 is 0.7m, and highly is 6m, and 1 inner wall of metal casing is horizontal interval to be equipped with stainless steel baffling board 2, and stainless steel baffling board 2 staggered arrangement, the interval between stainless steel baffling board 2 is 2 m. A water inlet 3 of cooling circulating water is formed in the bottom of the metal shell 1, a valve I4 is arranged at the water inlet 3 and is electrically connected with a controller 5 to control water flow, and a water outlet 6 of the cooling circulating water is formed in the top of the metal shell 1;
the metal shell 1 is internally provided with a low-pressure ultraviolet mercury lamp 7, and the illumination intensity of the low-pressure ultraviolet mercury lamp 7 is 100W/m3The low-pressure ultraviolet mercury lamp 7 emits ultraviolet with the wavelength range of 200nm-230nm, and the low-pressure ultraviolet mercury lamp 7 is electrically connected with a controller 5 and used for controlling the on-off and the illumination intensity of the low-pressure ultraviolet mercury lamp 7;
a quartz sealing sleeve 8 is sealed outside the low-pressure ultraviolet mercury lamp 7, the inner diameter of the quartz sealing sleeve 8 is 0.5m, and the thickness of the quartz sealing sleeve is 3 mm;
the outer wall of the quartz sealing sleeve 8 is sleeved with a spiral coil pipe 9 made of low-absorbance quartz, the total length of the spiral coil pipe 9 is 30m, the spiral diameter is 0.5m, the thread pitch is 10mm, the inner diameter is 30mm, and the thickness of the pipe wall is 3 mm. The feed end of spiral coil 9 runs through metal casing bottom and communicates with feed pump 11 through tetrafluoro pipe 10, and the feed end of spiral coil 9 is equipped with valve II 12, and the discharge end of spiral coil 9 runs through metal casing's top and communicates with discharge pump 13 through tetrafluoro pipe 10, and the discharge end of spiral coil 9 is equipped with valve III 14, and discharge pump 13 has product holding vessel 15 through the pipeline intercommunication, and valve II 12, valve III 14 all are connected with 5 electricity of controller to control the material velocity of flow.
The reactor of the present scheme can obtain 254kg of polymer grade ethylene glycol per hour, and the light transmittance of the reactor under 220nm ultraviolet light is 75.2%.
Example 2
The utility model provides a preparation polymerization level photocatalysis spiral coil tubular reactor for ethylene glycol, includes vertical tubulose and sealed metal casing 1, and the internal diameter of metal casing 1 is 2m, highly is 15m, and 1 inner wall of metal casing is horizontal interval and is equipped with stainless steel baffle 2, and stainless steel baffle 2 staggered arrangement, the interval between the stainless steel baffle 2 is 3 m. A water inlet 3 of cooling circulating water is formed in the bottom of the metal shell 1, a valve I4 is arranged at the water inlet 3 and is electrically connected with a controller 5 to control water flow, and a water outlet 6 of the cooling circulating water is formed in the top of the metal shell 1;
the metal shell 1 is internally provided with a low-pressure ultraviolet mercury lamp 7, and the illumination intensity of the low-pressure ultraviolet mercury lamp 7 is 200W/m3The ultraviolet wavelength range emitted by the low-pressure ultraviolet mercury lamp 7 is 190nm-240nm, and the low-pressure ultraviolet mercury lamp 7 is electrically connected with a controller 5 and used for controlling the on-off and illumination intensity of the low-pressure ultraviolet mercury lamp 7;
a quartz sealing sleeve 8 is sealed outside the low-pressure ultraviolet mercury lamp 7, the inner diameter of the quartz sealing sleeve 8 is 1.5m, and the thickness is 4 mm;
the outer wall of the quartz sealing sleeve 8 is sleeved with a spiral coil pipe 9 made of low-absorbance quartz, the total length of the spiral coil pipe 9 is 90m, the spiral diameter is 1.5m, the thread pitch is 50mm, the inner diameter is 50mm, and the thickness of the pipe wall is 4 mm. The feed end of spiral coil 9 runs through metal casing bottom and communicates with feed pump 11 through tetrafluoro pipe 10, and the feed end of spiral coil 9 is equipped with valve II 12, and the discharge end of spiral coil 9 runs through metal casing's top and communicates with discharge pump 13 through tetrafluoro pipe 10, and the discharge end of spiral coil 9 is equipped with valve III 14, and discharge pump 13 has product holding vessel 15 through the pipeline intercommunication, and valve II 12, valve III 14 all are connected with 5 electricity of controller to control the material velocity of flow.
The reactor of the scheme can obtain 5600kg of polymer grade ethylene glycol per hour, and the light transmittance of the ethylene glycol under 220nm ultraviolet light is 73.4%.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A photocatalytic spiral coil type reactor for preparing polymer-grade ethylene glycol is characterized in that: including vertical tubulose and sealed metal casing, metal casing's bottom is equipped with cooling circulation water's water inlet, and metal casing's top is equipped with cooling circulation water's delivery port, the inside low pressure ultraviolet mercury lamp that is equipped with of metal casing, low pressure ultraviolet mercury lamp electricity are connected with the controller, low pressure ultraviolet mercury lamp external seal has quartz seal sleeve, quartz seal sleeve outer wall cover is equipped with the spiral coil pipe of low absorbance quartz material, and spiral coil's feed end runs through the metal casing bottom and through tetrafluoro pipe and charge pump intercommunication, and spiral coil's discharge end runs through metal casing's top and through tetrafluoro pipe and discharge pump intercommunication, the discharge pump has the product holding vessel through pipeline intercommunication.
2. The photocatalytic spiral coil reactor for preparing polymer-grade ethylene glycol according to claim 1, wherein: the inner diameter of the metal shell is 0.25-4m, and the height of the metal shell is 3-20 m.
3. The photocatalytic spiral coil reactor for preparing polymer-grade ethylene glycol according to claim 1, wherein: the inner diameter of the quartz sealing sleeve is 0.2-3.3m, and the thickness is 2-6 mm.
4. The photocatalytic spiral coil reactor for preparing polymer-grade ethylene glycol according to claim 1, wherein: the total length of the spiral coil is 10-120m, the spiral diameter is 0.2-3m, and the thread pitch is 5-50 mm.
5. The photocatalytic spiral coil reactor for preparing polymer-grade ethylene glycol according to claim 4, wherein: the inner diameter of the coil pipe is 15-100mm, and the thickness of the pipe wall is 2-8 mm.
6. The photocatalytic spiral coil reactor for preparing polymer-grade ethylene glycol according to claim 1, wherein: the illumination intensity of the low-pressure ultraviolet mercury lamp is 50W-300W/m3The ultraviolet wavelength range emitted by the low-pressure ultraviolet mercury lamp is 180nm-250 nm.
7. The photocatalytic spiral coil reactor for preparing polymer-grade ethylene glycol according to claim 1, wherein: stainless steel baffling baffles are transversely arranged on the inner wall of the metal shell at intervals and are arranged in a staggered mode, and the distance between every two adjacent stainless steel baffling baffles is 2 m.
8. The photocatalytic spiral coil reactor for preparing polymer-grade ethylene glycol according to claim 1, wherein: the water inlet of cooling circulation water is equipped with valve I, and spiral coil's feed end is equipped with valve II, and spiral coil's discharge end is equipped with valve III, valve I, valve II, valve III all are connected with the controller electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022144892.6U CN213434389U (en) | 2020-09-27 | 2020-09-27 | Photocatalytic spiral coil type reactor for preparing polymer-grade ethylene glycol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022144892.6U CN213434389U (en) | 2020-09-27 | 2020-09-27 | Photocatalytic spiral coil type reactor for preparing polymer-grade ethylene glycol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213434389U true CN213434389U (en) | 2021-06-15 |
Family
ID=76281803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022144892.6U Active CN213434389U (en) | 2020-09-27 | 2020-09-27 | Photocatalytic spiral coil type reactor for preparing polymer-grade ethylene glycol |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213434389U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113019266A (en) * | 2019-12-09 | 2021-06-25 | 上海合全药业股份有限公司 | Continuous photocatalytic pipeline reactor and method for carrying out trifluoromethylation reaction |
| CN114797736A (en) * | 2022-04-07 | 2022-07-29 | 西安交通大学 | Pipe flow type hydrothermal and solvothermal synthesis reactor with step heat preservation function |
-
2020
- 2020-09-27 CN CN202022144892.6U patent/CN213434389U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113019266A (en) * | 2019-12-09 | 2021-06-25 | 上海合全药业股份有限公司 | Continuous photocatalytic pipeline reactor and method for carrying out trifluoromethylation reaction |
| CN113019266B (en) * | 2019-12-09 | 2024-06-04 | 上海合全药业股份有限公司 | Continuous photocatalytic pipe reactor and method for carrying out trifluoromethylation reaction |
| CN114797736A (en) * | 2022-04-07 | 2022-07-29 | 西安交通大学 | Pipe flow type hydrothermal and solvothermal synthesis reactor with step heat preservation function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN213434389U (en) | Photocatalytic spiral coil type reactor for preparing polymer-grade ethylene glycol | |
| CN105112100B (en) | Continuous production technique of chlorinated paraffin | |
| CN103482835B (en) | Sludge hydrolysis device and hydrolysis process | |
| CN103232090A (en) | Ultrasound-assisted photocatalysis water processing device | |
| CN104649884B (en) | Method and production device of preparing glyoxylic acid through catalytic oxidization of glyoxal by air with nitrogen oxide under normal pressure | |
| CN204022465U (en) | A kind of portable hydrogen-hydrogen-feeding system | |
| CN103523855A (en) | Supported photocatalytic degradation method and supported photocatalytic real-time on-line degradation device | |
| CN103626185B (en) | Polysilicon production apparatus | |
| CN107376576A (en) | A kind of waste gas purification apparatus for amino acid fermentation workshop | |
| CN109821399A (en) | Emission-control equipment associated with a kind of no extreme ultraviolet and bioanalysis | |
| CN207659165U (en) | A kind of Fenton oxidation reaction tower apparatus | |
| CN207259201U (en) | The equipment handled using photochemical catalytic oxidation cooling circulating water and landscape water | |
| CN203545860U (en) | Sludge hydrolyzing device | |
| CN208414088U (en) | A kind of ozone catalytic device | |
| CN202576122U (en) | Water body comprehensive treatment device | |
| CN216137211U (en) | Reactor for continuous photocatalytic chlorination | |
| CN202988711U (en) | Chlorine dioxide generator | |
| CN209663254U (en) | A kind of photocatalytic oxidation device | |
| CN208932994U (en) | A kind of separator for separation phosgene in purification media | |
| CN216756395U (en) | Photocatalysis chlorination reaction device | |
| CN104387258A (en) | Chloroacetic acid production method and chlorination reactor | |
| CN101003362A (en) | Safe, environmental protecting chlorine dioxide generator | |
| CN221015996U (en) | Lamp tube cooling device in production of photochlorination reaction kettle equipment | |
| CN219929852U (en) | Treatment device for byproduct formaldehyde-containing waste acid of organic phosphine product for producing water treatment agent | |
| CN105152135A (en) | Novel-structure far-infrared heating type chlorine dioxide generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |