CN201220151Y - Fractionating tower of liquid phase cascade - Google Patents
Fractionating tower of liquid phase cascade Download PDFInfo
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- CN201220151Y CN201220151Y CNU2008200378087U CN200820037808U CN201220151Y CN 201220151 Y CN201220151 Y CN 201220151Y CN U2008200378087 U CNU2008200378087 U CN U2008200378087U CN 200820037808 U CN200820037808 U CN 200820037808U CN 201220151 Y CN201220151 Y CN 201220151Y
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- rectifying column
- liquid phase
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Abstract
The utility model relates to a rectification tower in a liquid phase cascade, which belongs to the technical filed of isotope separating and rectifying facilities. The rectification tower in a liquid phase cascade comprises a group of tower bodies each of which comprises a tower bottom reboiler. The rectification tower is characterized in that a column bottom liquid collecting device which is used for collecting in-tower liquid and leading the collected in-tower liquid to the tower top of a rectification tower at a latter stage by the aide of a circulating device is arranged below the tower body corresponding to the upper part of the tower bottom reboiler. The utility model has the advantages that the additional arrangement of the column bottom liquid collecting device between the underside of the tower body of the rectification tower and the tower bottom reboiler enables the tower top liquid from the rectification tower at the latter stage to be separated from liquid flowing in a rectification tower at a former stage after the tower top liquid is led into the column bottom of the rectification tower at the former stage so as to avoid the back mixing of two feed liquid streams, namely the back mixing of two phases, and therefore, the separation efficiency can be improved. The utility model can prevent pollutants which come from filling from polluting and blocking a packing layer of the rectification tower at the latter stage in a process that the pollutants are conveyed from the rectification tower at the former stage to the rectification tower at the latter stage.
Description
Technical field
The utility model belongs to isotopic separation, rectifying device technical field, is specifically related to a kind of rectifying column of liquid phase cascade.
Background technology
In technology by natural water separated oxygen 18 water, need to adopt the rectifying column of liquid phase cascade, so-called liquid phase cascade is exactly that feed liquid with the cat head of back one-level rectifying column is back in the tower still of previous stage rectifying column, simultaneously the feed liquid in the tower still of previous stage rectifying column is delivered to the cat head of back one-level rectifying column.And the common rectifying tower in adopting prior art is implemented in the process of liquid phase cascade separated oxygen 18 water, the feed liquid air-teturning mixed phenomenon often appears, two-phase promptly occurring mixes in the tower still of rectifying column, further say, the liquid that is incorporated into by the condensate liquid fairlead of the condenser of back one-level rectifying column in the tower still of previous stage rectifying column mixes with the liquid generation that the previous stage rectifying column falls, the feed concentration of back one-level cat head is reduced, influence separative efficiency.Because, the concentration of the rework solution of previous stage rectifying column is identical with the phase concentrations of the cat head of back one-level rectifying column, and the actual liquid concentration that balances each other that is similar to of the liquid through the condensation of previous stage rectifying column of one-level rectifying column after flowing into, therefore the two concentration is different, in general promptly conventional chemical products distillation process, tend to ignore this situation, but in the isotopic separation distillation process, the variation meeting of the overhead liquid concentration of rectifying column directly influences the separative efficiency of rectifying column.In addition, in the use of rectifying column, when especially aqueous mixture being separated, tend to adopt the filler of surface oxidation treatment, to increase hydrophily.Yet this filler in use tends to show filling surface and strips off, thereby pollutes and stop up filler.In view of the above problems, be necessary the rectifying column of liquid phase cascade is improved, use and avoid the liquid dispersion phenomenon of rectifying column in distillation process and prevent that the filling surface cast from causing pollution, the obstruction to filler.
Summary of the invention
Task of the present utility model is will provide a kind of can avoid liquid dispersion effectively and prevent that inner-tower filling material from polluting and even stopping up the rectifying column of the liquid phase cascade of packing layer because of the surface comes off.
Task of the present utility model is finished like this, a kind of rectifying column of liquid phase cascade, it comprises one group of tower body, tower body comprises tower bottom reboiler, characteristics: below the tower body and the top corresponding to described tower bottom reboiler be provided with one be used for collecting liquid in the tower and with collected tower in liquid thereby help EGR and be drawn out to the tower still liquid collector that back one-level rectifying column cat head goes.
In a specific embodiment of the present utility model, described tower still liquid collector comprises final stage tower joint, liquid-collecting weir, back one-level tower pipe interface, one pack support and one group of liquid collecting plate and one group of fixed bar, the top of final stage tower joint and the bottom of tower body are fixed, and the bottom of final stage tower joint and the top of described tower bottom reboiler are fixed, liquid-collecting weir is arranged in the cavity volume of final stage tower joint, the cavity volume of final stage tower joint is separated into gas phase chamber and liquid phase cavity, and constitute a collecting tank on the top of described liquid-collecting weir, described liquid phase cavity communicates with the transition conduit that is arranged on final stage tower joint sidepiece, transition conduit and described EGR connect, one end of back one-level tower pipe interface is stretched in the described gas phase chamber, the other end is stretched over the outer condensate liquid fairlead with back one-level tower body of described final stage tower joint and connects, one pack support with the interval state be bound up on one group of fixed bar and fix with the inwall of described final stage tower joint, each spaced apartly is provided with the liquid collecting plate caulking groove that the position corresponds to each other on a pack support, one group of liquid collecting plate mates with each other and inserts and is embedded in the described liquid collecting plate caulking groove, be formed with the steam channel that is used for for the steam circulation between each piece liquid collecting plate, steam channel communicates with the inner chamber of tower body.
In another specific embodiment of the present utility model, the bottom of the length direction of described liquid collecting plate constitutes intake chute.
In another specific embodiment of the present utility model, the shape of cross section of described intake chute is a U-shaped.
In another specific embodiment of the present utility model, described liquid collecting plate be heeling condition insert on the liquid collecting plate caulking groove that is embedded on the described support, the direction of inclination is towards described liquid phase cavity.
Go back in the specific embodiment of the present utility model, the angle of inclination of described inclination is 10～20 °.
More of the present utility model and in specific embodiment, the angle of inclination of described inclination is 15 °.
In of the present utility model and then specific embodiment, corresponding both sides, the top of the inwall of described final stage tower joint respectively extend and are connected at least one pair of first fixing ear, and the position in the described pack support is in and similarly respectively extends the quantity and the first fixing second fixing ear that equate of ear on the support of opposite ends of fixed bar, and fixedly ear is fixed to one another for first, second.
Of the present utility model again more and in specific embodiment, described EGR comprises motor, the circulating pump and first feed tube, motor matches with circulating pump, one end of first feed tube and described transition conduit connect, the inlet of the other end and described circulating pump connects, and an end of the liquid outlet first line of a couplet of circulating pump knot drain pipe, the other end of drain pipe connects with the overhead condenser feed tube of first overhead condenser of the tower body of back one-level rectifying column, wherein, on the pipeline of described first feed tube, be provided with first valve, on first feed tube and pipeline that drain pipe connects mutually, be provided with second valve, and on drain pipe, be provided with Pressure gauge.
In again of the present utility model and then specific embodiment, described overhead condenser feed tube is provided with visor and the 3rd valve with the pipeline of the end that described drain pipe connects mutually.
The technical scheme that the utility model is recommended: because below the tower body of rectifying column and set up tower still liquid collector between the tower bottom reboiler, thereby can make come from back one-level rectifying column overhead liquid after being incorporated into the tower still of previous stage rectifying column with the previous stage rectifying column in the liquid wandered separate, avoiding two bursts of feed liquids is the back-mixing of two-phase, therefore can improve separative efficiency; Can prevent that the pollutant that comes from filler is transported to packing layer pollution, the obstruction that causes the one-level rectifying column of back in the one-level rectifying column of back from the previous stage rectifying column.
Description of drawings
Fig. 1 is the schematic diagram of the rectifying column of the utility model liquid phase cascade.
Fig. 2 is a specific embodiment structure chart of tower still liquid collector of the present utility model.
The specific embodiment
Ask for an interview Fig. 1, provided the liquid phase cascade rectifying column that the quantity that is used for isotopic separation, rectifying is not illustrated restriction, the isotopic separation of being said, rectifying here at object be meant the separated oxygen 18 water.As the industry's knowledge of the reason, occurring in nature hydrogen has two kinds of stable isotopes, and one is
1H (protium), two are
2H (deuterium); Oxygen has three kinds of stable isotopes, and one is
16O (oxygen 16), two is
17O (oxygen 17), three is
18O (oxygen 18).The water that is made of two hydrogen, one oxygen just has 9 kinds of stable isotopic molecules, and they are present in the natural water in varing proportions.Heavy isotope by hydrogen
2The water that H constitutes is in heavy water; And by the heavy isotope of oxygen
18The water that O constitutes is oxygen 18 water.The abundance of natural water oxygen-18 only is 0.2%, because the isotopic molecule difference is minimum, separates very difficulty, often needs numerous number of theoretical plates can be with the isotope product purification refine when utilizing the rectifying mode to separate.And the theoretically perfect tray number that is known as rectifying column at present is≤12/m, therefore according to the technology of separated oxygen 18 water, needs the number of theoretical plate about 2500 the oxygen isotopic number can be concentrated to atomic percent more than 98% at least.And build the height of a rectifying column at least at 200 meters according to 2500 number of theoretical plates; therefore be unpractical; this just need implement liquid phase cascade with a plurality of rectifying columns; so-called liquid phase cascade is meant that the feed liquid with back one-level rectifying column cat head is back in the tower still of previous stage rectifying column; simultaneously the feed liquid in the tower still of previous stage rectifying column is transported to the cat head of back one-level rectifying column; yet the air-teturning mixed phenomenon that feed liquid in this process, occurs through regular meeting; be that two-phase is mixed in the tower still; the feed concentration of the cat head of back one-level rectifying column is changed, reduce separative efficiency.
In view of above-mentioned, the utility model people just is equipped with a tower still liquid collector 2 below the tower body 1 of the rectifying column of each liquid phase cascade and corresponding to the top of tower bottom reboiler 11, so that by this tower still liquid collector 2 will back one-level rectifying column the tower still of liquid and previous stage rectifying column in feed liquid clearly separate (differentiations), avoid the promptly mutual mixing of back-mixing of two bursts of feed liquids.As everyone knows, oxygen 18 concentration of the cat head feed liquid of back one-level rectifying column can be lower than the feed concentration in the previous stage rectifying column conveying tower still in the past, and the liquid phase cascade of a plurality of rectifying columns that isotopic separation is adopted all must be very accurate to the flow and the concentration requirement of gas-liquid phase, some small variations will have influence on separating effect, and avoid back-mixing can improve the separating property of system, increase separative efficiency; Tower still liquid collector 2 also helps to reduce the fluctuation of rectifying column liquid in the course of the work, improves the stability of distillation process.Because the variation of any one flow will significantly reduce separating property in the gas-liquid two-phase, so tower still liquid collector 2 can play cushioning effect, improves separating property; The setting of tower still liquid collector 2 also can avoid pollutant to be transported to back one-level rectifying column from the previous stage rectifying column.Because in the isotopic separation process, its separation can be subjected to the influence of impurity content, impurity can be trapped in by tower still liquid collector 2 in the tower bottom reboiler 11 of previous stage and can reduce pollution to rectifying column, increases the stability of separation process.
Ask for an interview Fig. 2,, provided preferably but not the concrete structure of the tower still liquid collector 2 that definitely is limited to as a kind of concrete embodiment.As the final stage tower of tower still liquid collector 2 joint 21, its top constitutes one first flange 212, fixes with the bottom of tower body 1 shown in Figure 1 with first bolt hole 2121 that bolt penetrates on first flange 212; The bottom of final stage tower joint 21 constitutes one second flange 213, fixes with the flange that bolt penetrates on second bolt hole 2131 on second flange 213 tower bottom reboiler 11 to that indicated in the drawings.A transition conduit 211 has been received in following side at final stage tower joint 21, and this transition conduit 211 connects with following EGR 12 that also will describe and that be shown among Fig. 1.In the cavity volume of final stage tower joint 21, be provided with a liquid-collecting weir 22, by this liquid-collecting weir 22 cavity volume of final stage tower joint 21 is separated and to be gas phase chamber 221 and liquid phase cavity 222, wherein: gas phase chamber 221 communicates with tower bottom reboiler 11, and liquid phase cavity 222 communicates with aforesaid transition conduit 211.In gas phase chamber 221, probe into an end of back one-level tower pipe interface 23, then the other end of one-level tower pipe interface 23 is stretched over the wall body of final stage tower joint 21 condensate liquid fairlead 13 outer and by the tower body 1 of back one-level rectifying column shown in Figure 1 and connects, by condensate liquid fairlead 13 with the condensate liquid in the cat head cooler 15 through after one-level tower pipe interface 23 introduce gas phase chambeies 221, and then enter tower bottom reboiler 11 and boil again, form behind the steam the 221 up cats head that promptly enter tower body 1 until the cat head that enters rectifying column from the gas phase chamber.Respectively extended a pair of first fixing ear 214 in the corresponding both sides, top of the inwall of final stage tower joint 21.One pack support 24 is fixed at least one pair of fixed bar 26 with interval mode each other, constitute collecting board caulking groove 241 spaced apart on every piece of support 24, and respectively extended a pair of second fixing ear 242 on the support that is positioned at corresponding two outsides 24 on the fixed bar 26, this to second fixedly ear 242 and first fixedly ear 214 is fixing.One group of liquid collecting plate 25 is inserted and is embedded on the collecting board caulking groove 241, and constitutes the intake chute 252 that shape of cross section is preferably U-shaped in the bottom of the length direction of liquid collecting plate 25, constitutes steam channel 251 between the adjacent liquid collecting plate 25.What the front had proposed boils the steam that forms at 221 cats head that must just can enter into rectifying column when up through steam channel 251 from the gas phase chamber again by tower bottom reboiler 11.As seen, one group of liquid collecting plate 25 has dual-use function, and so-called dual-use function is meant: one can hold back the liquid in the tower body 1 or claim the liquid of Ben Tanei, and two can pass through for the steam after boiling again, and the liquid of being held back enters in the liquid phase cavity 222.In addition, one group of liquid collecting plate 25 tilts towards liquid phase cavity 222, and the angle of inclination is preferably 10～20 °, is 12～18 ° preferably, is preferably 15 °, and present embodiment is selected 15 °, and this angle can import liquid the liquid phase cavity 222 from intake chute 252 rightly.
Still ask for an interview Fig. 2 and in conjunction with Fig. 1, be incorporated into liquid in the liquid phase cavity 222 through drawing with the transition conduit 211 that EGR 12 (shown in Figure 1) connects mutually by liquid collecting plate 25.EGR 12 comprises motor 123 and the circulating pump 122 and first feed tube 121 that mates with each other, one end and the transition conduit 211 of first feed tube 121 connect, and the inlet of the other end of first feed tube 121 and circulating pump 122 connects, one end of the liquid outlet first line of a couplet knot drain pipe 124 of circulating pump 122, one client link of the overhead condenser feed tube 141 of first overhead condenser 14 of the other end of drain pipe 124 and back one-level rectifying column, the other end of overhead condenser feed tube 141 connects with the feed liquor interface of overhead condenser 14.Be provided with visor 1411 and the 3rd valve 1412 successively at the position that overhead condenser feed tube 141 and drain pipe 124 connect mutually.On the pipeline of first feed tube 121, be provided with first valve 1211, on the pipeline that connects first feed tube 121 and drain pipe 124, be provided with second valve 1212, on drain pipe 124, be provided with Pressure gauge 1241.1212 overcurrent regulating actions of second valve wherein, the excessive liquid of using in drain pipe 124 turns back to first feed tube 121, and the assurance of inflow-rate of water turbine is to determine by Pressure gauge 1241.When quitting work, circulating pump 122 can cut off flow channel for liquids by closing first valve 1211.
The applicant sketches operation principle of the present utility model.Collect and import in the liquid phase cavity 222 by liquid collecting plate 25 shown in Figure 2 to the liquid of wandering down in the tower body 1 of a rectifying column on the left side of anticipating shown in Fig. 1, and be incorporated in the liquid phase cavity 222 by collecting tank 223, under the work of EGR 12, and opening first, second, the 3rd valve 1211,1212, under 1412 the situation, liquid in the liquid phase cavity 222 is through drain pipe 211, first feed tube 121, after entering into, drain pipe 124 and overhead condenser feed tube 141 enter wet tank 16 after first overhead condenser, 14 condensations of the tower body 1 of one-level rectifying column, the cat head that enters the most of liquid one-level rectifying column after second feed tube 162 enters in the wet tank 16 is the cat head of a tower body 1 of centre of the tower body 1 of three rectifying columns shown in Fig. 1, then the gas in the tower body 1 of one-level rectifying column enters 15 condensations of second overhead condenser through cat head gas phase pipe 17, and condensed liquid is through condensate liquid fairlead 13, back one-level tower pipe interface 23 (Fig. 2 shows) is introduced gas phase chamber 221 until entering tower bottom reboiler 11 heating of tower body 1 that previous stage is a rectifying column on the left side, vaporization; Sub-fraction in the wet tank 16 or title fraction liquid enter condensate liquid fairlead 13 through overflow pipe 161, by condensate liquid fairlead 13 through after one-level tower pipe interface go into gas phase chamber 221 23 times, up to entering tower bottom reboiler 11 heating of tower body 1 that previous stage is a rectifying column on the left side.The condensate liquid fairlead 13 of the tower body 1 by back one-level rectifying column noted earlier be incorporated into liquid in the tower bottom reboiler 11 of tower body 1 of previous stage rectifying column through tower bottom reboiler 11 heating vaporization back steam just from rising to cat head by the steam channel on the liquid collecting plate 25 of the clear announcement of Fig. 1.And the liquid of wandering downwards in the tower body 1 of previous stage rectifying column is introduced liquid phase cavity through liquid collecting plate 25.
By foregoing description as can be known, the technical solution of the utility model can make the liquid of back one-level rectifying column after introducing the previous stage rectifying column, can not mix mutually with the liquid wandered downwards in the tower body 1 of previous stage rectifying column, this is because the effect that the liquid collecting plate 25 of tower still liquid collector 2 is being taken on the obstructed liquid of ventilating.
Claims (10)
1, a kind of rectifying column of liquid phase cascade, it comprises one group of tower body (1), tower body (1) comprises tower bottom reboiler (11), it is characterized in that the below of tower body (1) and the top corresponding to described tower bottom reboiler (11) be provided with one be used for collecting in the tower liquid and with collected tower in liquid thereby help EGR (12) and be drawn out to the tower still liquid collector (2) that back one-level rectifying column cat head goes.
2, the rectifying column of liquid phase cascade according to claim 1, it is characterized in that described tower still liquid collector (2) comprises final stage tower joint (21), liquid-collecting weir (22), back one-level tower pipe interface (23), one pack support (24) and one group of liquid collecting plate (25) and one group of fixed bar (26), the top of final stage tower joint (21) and the bottom of tower body (1) are fixed, and the bottom of final stage tower joint (21) and the top of described tower bottom reboiler (11) are fixed, liquid-collecting weir (22) is arranged in the cavity volume of final stage tower joint (21), the cavity volume of final stage tower joint (21) is separated into gas phase chamber (221) and liquid phase cavity (222), and constitute a collecting tank (223) on the top of described liquid-collecting weir (22), described liquid phase cavity (222) communicates with the transition conduit (211) that is arranged on final stage tower joint (21) sidepiece, transition conduit (211) connects with described EGR (12), one end of back one-level tower pipe interface (23) is stretched in the described gas phase chamber (221), the other end is stretched over the outer condensate liquid fairlead (13) with back one-level tower body (1) of described final stage tower joint (21) and connects, one pack support (24) with the interval state be bound up on that one group of fixed bar (26) is gone up and fix with the inwall of described final stage tower joint (21), go up each at a pack support (24) and spaced apartly be provided with the liquid collecting plate caulking groove (241) that the position corresponds to each other, one group of liquid collecting plate (25) mates with each other and inserts and is embedded in the described liquid collecting plate caulking groove (241), be formed with the steam channel (251) that is used for for the steam circulation between each piece liquid collecting plate (25), steam channel (251) communicates with the inner chamber of tower body (1).
3, the rectifying column of liquid phase cascade according to claim 2 is characterized in that the bottom of the length direction of described liquid collecting plate (25) constitutes intake chute (252).
4, the rectifying column of liquid phase cascade according to claim 3, the shape of cross section that it is characterized in that described intake chute (252) is a U-shaped.
5, the rectifying column of liquid phase cascade according to claim 2, it is characterized in that described liquid collecting plate (25) be heeling condition insert on the liquid collecting plate caulking groove (241) that is embedded on the described support (24), the direction of inclination is towards described liquid phase cavity (222).
6, the rectifying column of liquid phase cascade according to claim 5, the angle of inclination that it is characterized in that described inclination is 10～20 °.
7, the rectifying column of liquid phase cascade according to claim 6, the angle of inclination that it is characterized in that described inclination is 15 °.
8, the rectifying column of liquid phase cascade according to claim 2, the corresponding both sides, top that it is characterized in that the inwall of described final stage tower joint (21) respectively extend and are connected at least one pair of first fixing ear (214), and the position in the described pack support (24) is in and similarly respectively extends the quantity and the first fixing second fixing ear (242) that equate of ear (214) on the support (24) of opposite ends of fixed bar (26), and fixedly ear (214,242) is fixed to one another for first, second.
9, the rectifying column of liquid phase cascade according to claim 1, it is characterized in that described EGR (12) comprises motor (123), circulating pump (122) and first feed tube (121), motor (123) matches with circulating pump (122), one end of first feed tube (121) and described transition conduit (211) connect, the inlet of the other end and described circulating pump (122) connects, and an end of the liquid outlet first line of a couplet of circulating pump (122) knot drain pipe (124), the other end of drain pipe (124) connects with the overhead condenser feed tube (141) of first overhead condenser (14) of the tower body (1) of back one-level rectifying column, wherein, on the pipeline of described first feed tube (121), be provided with first valve (1211), on first feed tube (121) and pipeline that drain pipe (124) connects mutually, be provided with second valve (1212), and on drain pipe (124), be provided with Pressure gauge (1241).
10, the rectifying column of liquid phase cascade according to claim 9 is characterized in that the pipeline of the end that described overhead condenser feed tube (141) and described drain pipe (124) connect mutually is provided with visor (1411) and the 3rd valve (1412).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200378087U CN201220151Y (en) | 2008-07-03 | 2008-07-03 | Fractionating tower of liquid phase cascade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200378087U CN201220151Y (en) | 2008-07-03 | 2008-07-03 | Fractionating tower of liquid phase cascade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201220151Y true CN201220151Y (en) | 2009-04-15 |
Family
ID=40573671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200378087U Expired - Lifetime CN201220151Y (en) | 2008-07-03 | 2008-07-03 | Fractionating tower of liquid phase cascade |
Country Status (1)
| Country | Link |
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| CN (1) | CN201220151Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101301582B (en) * | 2008-07-03 | 2010-06-02 | 常熟华益化工有限公司 | Fractionating tower of liquid phase cascade |
| CN102172435A (en) * | 2011-03-15 | 2011-09-07 | 徐凡卜 | Tandem multistage continuous rectification solvent recoverer |
| CN108854533A (en) * | 2018-06-29 | 2018-11-23 | 四川大学 | A kind of -16 water of ultrapure oxygen distillation filler and its preparation process |
-
2008
- 2008-07-03 CN CNU2008200378087U patent/CN201220151Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101301582B (en) * | 2008-07-03 | 2010-06-02 | 常熟华益化工有限公司 | Fractionating tower of liquid phase cascade |
| CN102172435A (en) * | 2011-03-15 | 2011-09-07 | 徐凡卜 | Tandem multistage continuous rectification solvent recoverer |
| CN108854533A (en) * | 2018-06-29 | 2018-11-23 | 四川大学 | A kind of -16 water of ultrapure oxygen distillation filler and its preparation process |
| CN108854533B (en) * | 2018-06-29 | 2022-01-18 | 四川大学 | Ultrapure oxygen-16 water distillation filler and preparation process thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090415 Effective date of abandoning: 20080703 |