CN202989019U - Flushing-free device for circularly manufacturing anhydrous ethanol - Google Patents
Flushing-free device for circularly manufacturing anhydrous ethanol Download PDFInfo
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- CN202989019U CN202989019U CN 201320002470 CN201320002470U CN202989019U CN 202989019 U CN202989019 U CN 202989019U CN 201320002470 CN201320002470 CN 201320002470 CN 201320002470 U CN201320002470 U CN 201320002470U CN 202989019 U CN202989019 U CN 202989019U
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- ethanol dehydration
- dehydration tower
- ethanol
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Abstract
The utility model relates to a flushing-free device for circularly manufacturing anhydrous ethanol. The device comprises an ethanol dehydration tower system formed by connecting at least two ethanol dehydration towers in parallel, a vacuum system, a vacuum buffer tank and a rectification tower, wherein the upper end of the ethanol dehydration tower system is connected with an outlet of the rectification tower, the side of the vacuum buffer tank is connected with a branch on the upper end of the ethanol dehydration tower system, the vacuum system is connected with the vacuum buffer tank, and the vacuum buffer tank is connected with the rectification tower. The flushing-free device has the following advantages that the yield of the anhydrous ethanol is improved, and the waste of resources is avoided.
Description
Technical field
The utility model relates to dehydrated alcohol and makes the field, is specifically related to the device that dehydrated alcohol is made in a kind of flushing-free circulation.
Background technology
Dehydrated alcohol is important organic solvent, is widely used in all respects such as medicine, coating, sanitary product, makeup, grease.Simultaneously, dehydrated alcohol or important basic chemical raw materials, for the manufacture of chemical substances such as acetaldehyde, second diene, ethamine, ethyl acetate, acetic acid, monochloroethane, and deriving many intermediates of the products such as medicine, dyestuff, coating, spices, synthetic rubber, washing composition, agricultural chemicals, its goods are nearly more than 300 kinds.
Utilization now is the most extensive, and most effective dehydrated alcohol manufacturing installation is the molecular sieve dehydration device.Existing molecular sieve dehydration device adopts the ethanol dehydration tower that includes molecular sieve that ethanolic soln is dewatered.Because molecular sieve can't adsorb after water regain is saturated again, existing molecular sieve dehydration device also comprises vacuum extractor and flushing arrangement.Flushing arrangement is used for dehydrated alcohol steam is sent into the ethanol dehydration tower, makes regenerating molecular sieve, and vacuum extractor is used for extracting out residual low-concentration ethanol steam in the ethanol dehydration tower, vacuum extractor guarantee its internal vacuum be-0.08 ~-0.09Mpa.Traditional molecular sieve dehydration device is directly discharged low-concentration ethanol.
The shortcoming of existing molecular sieve dehydration device is: flushing arrangement is sent into dehydrated alcohol steam in the ethanol dehydration tower, makes regenerating molecular sieve, has wasted a large amount of dehydrated alcohol products, has reduced the yield of dehydrated alcohol product; Directly discharge low-concentration ethanol, cause the wasting of resources, also reduced the yield of dehydrated alcohol product simultaneously.
The utility model content
It is low that the purpose of this utility model namely is to overcome existing molecular sieve dehydration plant yield for the manufacture of dehydrated alcohol, and the deficiency of waste resource provides a kind of flushing-free circulation to make the device of dehydrated alcohol.
The purpose of this utility model is achieved through the following technical solutions:
The device of dehydrated alcohol is made in a kind of flushing-free circulation, comprise the ethanol dehydration tower group, vacuum system, vacuum buffer tank and the rectifying tower that are composed in parallel by at least two ethanol dehydration towers, the upper end of ethanol dehydration tower group is connected with the outlet of rectifying tower, vacuum buffer tank is other to be connected on the upper end branch road of ethanol dehydration tower group, vacuum system is connected with vacuum buffer tank, and vacuum buffer tank is connected with rectifying tower.Vacuum system is used for extracting the low-concentration ethanol steam of ethanol dehydration tower, keep ethanol dehydration tower internal vacuum be-0.091 ~-0.094Mpa, make regenerating molecular sieve, vacuum buffer tank is used for storing low-concentration ethanol steam, and low-concentration ethanol steam is sent into rectifying in rectifying tower, obtain being directly used in the higher alcohol steam of concentration of ethanol dehydration, alcohol steam enters in the ethanol dehydration tower and dewaters, and realizes circulation manufacturing dehydrated alcohol.
Preferably, also comprise interchanger B, interchanger B is connected with the lower end of described ethanol dehydration tower group.Interchanger B obtains the product dehydrated alcohol for the dehydrated alcohol steam that obtains in cooling ethanol dehydration tower.
Preferably, also comprise the light wine storage tank, the light wine storage tank is arranged between described vacuum buffer tank and described rectifying tower.The light wine storage tank is used for storing cooling low-concentration ethanol steam.
Preferably, also comprise interchanger C, interchanger C is arranged between the upper end branch road of described vacuum buffer tank and described ethanol dehydration tower group.Interchanger C is used for the cooling low-concentration ethanol steam of extracting out in the ethanol dehydration tower.
Preferably, also comprise interchanger A, interchanger A is arranged between the upper end and rectifying tower of described ethanol dehydration tower group.Interchanger A is used for alcohol steam is heated into ethanol water superheated vapour, and ethanol water superheated vapour enters dehydration in the ethanol dehydration tower.
Preferably, also comprise interchanger B and interchanger C, interchanger B is connected with the lower end of described ethanol dehydration tower group, and interchanger C is arranged between the upper end branch road of described vacuum buffer tank and described ethanol dehydration tower group, and described light wine storage tank is connected with described rectifying tower by interchanger B.Low-concentration ethanol steam is cooled to low-concentration ethanol solution through interchanger C, low-concentration ethanol solution in interchanger B with the dehydrated alcohol steam heat-exchanging, enter rectifying tower after intensification.
Vacuum system is used for internal tank is vacuumized by vacuum pump, PLC sequence control system, gas-holder, vacuum pipe, vacuum valve, filter the system that assembly etc. forms overseas.
Connect by pipeline between all component, the high temperature steel that pipeline is 20# or 304 by the trade mark is made.
Advantage of the present utility model and beneficial effect are:
1. cancelled flushing arrangement ,-0.091 ~-condition of 0.094Mpa vacuum tightness under, adopt the mode that vacuumizes that the molecular sieve in the ethanol dehydration tower is regenerated, greatly improved the yield of dehydrated alcohol, reduced cost;
2. be provided with rectifying tower, rectifying tower, ethanol dehydration tower group, vacuum buffer tank form the recycle system, make the low-concentration ethanol steam-energy access recycle, have stopped the wasting of resources, have improved the yield of dehydrated alcohol, have reduced cost.
Description of drawings
In order to be illustrated more clearly in embodiment of the present utility model, the below will make simple explanation to the required accompanying drawing of using in description the utility model embodiment.Apparent, the accompanying drawing in the following describes is only some embodiment that put down in writing in the utility model, to those skilled in the art, in the situation that do not pay creative work, can also according to following accompanying drawing, obtain other accompanying drawing.
Fig. 1 is the structural representation of the utility model embodiment 1;
Fig. 2 is the structural representation of the utility model embodiment 2;
Fig. 3 is the structural representation of the utility model embodiment 3;
Wherein, the component title that Reference numeral is corresponding is as follows:
1-ethanol dehydration tower A, 2-ethanol dehydration tower B, 3-vacuum buffer tank, 4-light wine storage tank, 5-vacuum system, 61-interchanger A, 62-interchanger B, 63-interchanger C, 71-valve A, 72-valve B, 73-valve C, 74-valve D, 75-valve E, 76-valve F, 8-rectifying tower, 9-topping-up pump.
Embodiment
In order to make those skilled in the art understand better the utility model, below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out clear, complete description.Apparent, embodiment described below is only the part in the utility model embodiment, rather than all.Based on the embodiment of the utility model record, those skilled in the art are not in the situation that pay other all embodiment that creative work obtains, all in the scope that the utility model is protected.
Embodiment 1:
As shown in Figure 1, the device of dehydrated alcohol is made in a kind of flushing-free circulation, comprise the ethanol dehydration tower group, vacuum system 5, vacuum buffer tank 3 and the rectifying tower 8 that are composed in parallel by ethanol dehydration tower A1 and ethanol dehydration tower B2, the upper end of ethanol dehydration tower group is connected with the outlet of rectifying tower 8, vacuum buffer tank 3 is other to be connected on the upper end branch road of ethanol dehydration tower group, vacuum system 5 is connected with vacuum buffer tank 3, and vacuum buffer tank 3 is connected with rectifying tower 8 by topping-up pump 9.Interchanger B62 is connected with the lower end of described ethanol dehydration tower group.Interchanger A61 is arranged between the upper end and rectifying tower 8 of described ethanol dehydration tower group.
Be provided with valve E75 and valve F76 on the lower end branch road of ethanol dehydration tower group, valve E75 is connected with ethanol dehydration tower A1, and valve F76 is connected with ethanol dehydration tower B2.Be provided with valve A71 and valve C73 on the upper end branch road of ethanol dehydration tower group, valve A71 is connected with ethanol dehydration tower A1, and valve C73 is connected with ethanol dehydration tower B2.Vacuum buffer tank 3 is other to be connected between valve A71 and ethanol dehydration tower A1, valve C73 and ethanol dehydration tower B2.Be respectively arranged with valve B72 and valve D74 on the pipeline of connection ethanol dehydration two branch roads of tower group and vacuum buffer tank 3.
The working process of the present embodiment is as follows:
A. alcohol steam is added thermosetting ethanol water superheated vapour by interchanger A61.
B. open valve A71 and E75, ethanol water superheated vapour is sent in ethanol dehydration tower A1 carried out adsorption dewatering, ethanol water superheated vapour enters from the top of ethanol dehydration tower A1, after passing adsorption bed, moisture is absorbed by molecular sieve, obtains dehydrated alcohol steam, and dehydrated alcohol steam is emitted from valve E75, heat exchange stores to the normal temperature liquid state through interchanger B62, namely obtains the dehydrated alcohol product.Water concentration in ethanol dehydration tower A1 stops sending into ethanol water superheated vapour in ethanol dehydration tower A near before saturated.
C. valve-off A71 and E74, open valve B72, makes the reverse outflow of low-concentration ethanol solution vapor in ethanol dehydration tower A1, discharges the moisture of molecular sieve adsorption.The low-concentration ethanol solution vapor is stored in vacuum buffer tank 3.
D. adopt 5 couples of ethanol dehydration tower A1 of vacuum system to vacuumize, make in ethanol dehydration tower A1 vacuum keep for-0.091MPa ~-0.094Mpa, complete the regeneration of molecular sieve, when vacuumizing, the low-concentration ethanol solution vapor of extraction is stored in vacuum buffer tank 3.
E. open topping-up pump 9, the low-concentration ethanol solution vapor that stores in step C and step D is sent into rectifying tower 8 rectifying, obtain the high concentration ethanol water vapor; The high concentration ethanol water vapor in interchanger A61 with dehydrated alcohol product steam heat-exchanging after, form to send into again to send into after high density dehydrated alcohol superheated vapour and carry out adsorption dewatering in the ethanol dehydration tower.
In the present embodiment, ethanol dehydration tower A1 and ethanol dehydration tower B2 adsorb respectively and regenerate, and when adsorbing, ethanol dehydration tower B2 is regenerating as ethanol dehydration tower A1; When adsorbing, ethanol dehydration tower A1 is regenerating, the continuity of assurance device as ethanol dehydration tower B2.
It is identical with ethanol dehydration tower A1 with the process of regeneration that ethanol dehydration tower B2 adsorbs, and ethanol dehydration tower B2 controls the break-make of ethanol dehydration tower B2 and miscellaneous equipment by valve C73, valve D74 and valve F76.
In the present embodiment, low-concentration ethanol solution is directly sent in rectifying tower 8, can be improved the speed of circulation of whole device.
Embodiment 2:
As shown in Figure 2, the device of dehydrated alcohol is made in a kind of flushing-free circulation, comprise the ethanol dehydration tower group, vacuum system 5, vacuum buffer tank 3 and the rectifying tower 8 that are composed in parallel by ethanol dehydration tower A1 and ethanol dehydration tower B2, the upper end of ethanol dehydration tower group is connected with the outlet of rectifying tower 8, interchanger C63 is other to be connected on the upper end branch road of ethanol dehydration tower group, vacuum buffer tank 3 is connected with interchanger C63, vacuum system 5 is connected with vacuum buffer tank 3, vacuum buffer tank 3 is connected with light wine storage tank 4, and light wine storage tank 4 is connected with rectifying tower 8 by topping-up pump 9.Interchanger B62 is connected with the lower end of described ethanol dehydration tower group.Interchanger A61 is arranged between the upper end and rectifying tower 8 of described ethanol dehydration tower group.
Be provided with valve E75 and valve F76 on the lower end branch road of ethanol dehydration tower group, valve E75 is connected with ethanol dehydration tower A1, and valve F76 is connected with ethanol dehydration tower B2.Be provided with valve A71 and valve C73 on the upper end branch road of ethanol dehydration tower group, valve A71 is connected with ethanol dehydration tower A1, and valve C73 is connected with ethanol dehydration tower B2.Interchanger C63 is other to be connected between valve A71 and ethanol dehydration tower A1, valve C73 and ethanol dehydration tower B2.Be respectively arranged with valve B72 and valve D74 on the pipeline of connection ethanol dehydration two branch roads of tower group and interchanger C63.
The working process of the present embodiment is as follows:
A. alcohol steam is added thermosetting ethanol water superheated vapour by interchanger A61.
B. open valve A71 and E75, ethanol water superheated vapour is sent in ethanol dehydration tower A1 carried out adsorption dewatering, ethanol water superheated vapour enters from the top of ethanol dehydration tower A1, after passing adsorption bed, moisture is absorbed by molecular sieve, obtains dehydrated alcohol steam, and dehydrated alcohol steam is emitted from valve E75, heat exchange stores to the normal temperature liquid state through interchanger B62, namely obtains the dehydrated alcohol product.Water concentration in ethanol dehydration tower A1 stops sending into ethanol water superheated vapour in ethanol dehydration tower A near before saturated.
C. valve-off A71 and E74, open valve B72, makes the reverse outflow of low-concentration ethanol solution vapor in ethanol dehydration tower A1, discharges the moisture of molecular sieve adsorption.The heat exchange in interchanger C63 of low-concentration ethanol solution vapor is stored in light wine storage tank 4 through vacuum buffer tank 3 after forming low-concentration ethanol solution.
D. adopt 5 couples of ethanol dehydration tower A1 of vacuum system to vacuumize, make in ethanol dehydration tower A1 vacuum keep for-0.091MPa ~-0.094Mpa, complete the regeneration of molecular sieve, when vacuumizing, when vacuumizing, the heat exchange in interchanger C63 of the low-concentration ethanol solution vapor of extraction is stored in light wine storage tank 4 through vacuum buffer tank 3 after forming low-concentration ethanol solution.
E. open topping-up pump 9, the low-concentration ethanol solution vapor that stores in step C and step D is sent into rectifying tower 8 rectifying, obtain the high concentration ethanol water vapor; The high concentration ethanol water vapor in interchanger A61 with dehydrated alcohol product steam heat-exchanging after, form to send into again to send into after high density dehydrated alcohol superheated vapour and carry out adsorption dewatering in the ethanol dehydration tower.
In the present embodiment, ethanol dehydration tower A1 and ethanol dehydration tower B2 adsorb respectively and regenerate, and when adsorbing, ethanol dehydration tower B2 is regenerating as ethanol dehydration tower A1; When adsorbing, ethanol dehydration tower A1 is regenerating, the continuity of assurance device as ethanol dehydration tower B2.
It is identical with ethanol dehydration tower A1 with the process of regeneration that ethanol dehydration tower B2 adsorbs, and ethanol dehydration tower B2 controls the break-make of ethanol dehydration tower B2 and miscellaneous equipment by valve C73, valve D74 and valve F76.
In the present embodiment, store concentrating after the cooling formation low-concentration ethanol of low-concentration ethanol solution vapor solution, and then unified sending in rectifying tower 8, reach overall loading in the time of making rectifying tower 8 work, increase work efficiency.
Embodiment 3:
As shown in Figure 3, the device of dehydrated alcohol is made in a kind of flushing-free circulation, comprise the ethanol dehydration tower group, vacuum system 5, vacuum buffer tank 3 and the rectifying tower 8 that are composed in parallel by ethanol dehydration tower A1 and ethanol dehydration tower B2, the upper end of ethanol dehydration tower group is connected with the outlet of rectifying tower 8, interchanger C63 is other to be connected on the upper end branch road of ethanol dehydration tower group, vacuum buffer tank 3 is connected with interchanger C63, and vacuum system 5 is connected with vacuum buffer tank 3, and vacuum buffer tank 3 is connected with light wine storage tank 4.Interchanger B62 is connected with the lower end of described ethanol dehydration tower group.Interchanger A61 is arranged between the upper end and rectifying tower 8 of described ethanol dehydration tower group.Light wine storage tank 4 is connected with topping-up pump 9, and topping-up pump 9 is connected with rectifying tower 8 by interchanger B62.
Be provided with valve E75 and valve F76 on the lower end branch road of ethanol dehydration tower group, valve E75 is connected with ethanol dehydration tower A1, and valve F76 is connected with ethanol dehydration tower B2.Be provided with valve A71 and valve C73 on the upper end branch road of ethanol dehydration tower group, valve A71 is connected with ethanol dehydration tower A1, and valve C73 is connected with ethanol dehydration tower B2.Interchanger C63 is other to be connected between valve A71 and ethanol dehydration tower A1, valve C73 and ethanol dehydration tower B2.Be respectively arranged with valve B72 and valve D74 on the pipeline of connection ethanol dehydration two branch roads of tower group and interchanger C63.
The working process of the present embodiment is as follows:
A. alcohol steam is added thermosetting ethanol water superheated vapour by interchanger A61.
B. open valve A71 and E75, ethanol water superheated vapour is sent in ethanol dehydration tower A1 carried out adsorption dewatering, ethanol water superheated vapour enters from the top of ethanol dehydration tower A1, after passing adsorption bed, moisture is absorbed by molecular sieve, obtains dehydrated alcohol steam, and dehydrated alcohol steam is emitted from valve E75, heat exchange stores to the normal temperature liquid state through interchanger B62, namely obtains the dehydrated alcohol product.Water concentration in ethanol dehydration tower A1 stops sending into ethanol water superheated vapour in ethanol dehydration tower A near before saturated.
C. valve-off A71 and E74, open valve B72, makes the reverse outflow of low-concentration ethanol solution vapor in ethanol dehydration tower A1, discharges the moisture of molecular sieve adsorption.The heat exchange in interchanger C63 of low-concentration ethanol solution vapor is stored in light wine storage tank 4 through vacuum buffer tank 3 after forming low-concentration ethanol solution.
D. adopt 5 couples of ethanol dehydration tower A1 of vacuum system to vacuumize, make in ethanol dehydration tower A1 vacuum keep for-0.091MPa ~-0.094Mpa, complete the regeneration of molecular sieve, when vacuumizing, when vacuumizing, the heat exchange in interchanger C63 of the low-concentration ethanol solution vapor of extraction is stored in light wine storage tank 4 through vacuum buffer tank 3 after forming low-concentration ethanol solution.
E. open topping-up pump 9, the low-concentration ethanol solution vapor that stores in step C and step D is sent into rectifying tower 8 rectifying, obtain the high concentration ethanol water vapor; The high concentration ethanol water vapor in interchanger A61 with dehydrated alcohol product steam heat-exchanging after, form to send into again to send into after high density dehydrated alcohol superheated vapour and carry out adsorption dewatering in the ethanol dehydration tower.Low-concentration ethanol solution first enters rectifying tower 8 again through interchanger B62, and in interchanger B62, low-concentration ethanol solution and dehydrated alcohol steam carry out heat exchange, make the dehydrated alcohol steam cooling to normal temperature, obtain the dehydrated alcohol product.
In the present embodiment, ethanol dehydration tower A1 and ethanol dehydration tower B2 adsorb respectively and regenerate, and when adsorbing, ethanol dehydration tower B2 is regenerating as ethanol dehydration tower A1; When adsorbing, ethanol dehydration tower A1 is regenerating, the continuity of assurance device as ethanol dehydration tower B2.
It is identical with ethanol dehydration tower A1 with the process of regeneration that ethanol dehydration tower B2 adsorbs, and ethanol dehydration tower B2 controls the break-make of ethanol dehydration tower B2 and miscellaneous equipment by valve C73, valve D74 and valve F76.
In the present embodiment, low-concentration ethanol solution and dehydrated alcohol steam are carried out heat exchange, obtain the dehydrated alcohol product, saved the energy.
Need to prove, the quantity of ethanol dehydration tower can be set as two or more according to actual needs.
In above-described embodiment, connect by pipeline between all component, the high temperature steel that pipeline is 20# or 304 by the trade mark is made, and can adapt to high-temperature work environment.
As mentioned above, just can realize preferably the utility model.
Claims (7)
1. a flushing-free circulates and makes the device of dehydrated alcohol, it is characterized in that: comprise the ethanol dehydration tower group, vacuum system, vacuum buffer tank and the rectifying tower that are composed in parallel by at least two ethanol dehydration towers, the upper end of ethanol dehydration tower group is connected with the outlet of rectifying tower, vacuum buffer tank is other to be connected on the upper end branch road of ethanol dehydration tower group, vacuum system is connected with vacuum buffer tank, and vacuum buffer tank is connected with rectifying tower.
2. the device of dehydrated alcohol is made in a kind of flushing-free circulation according to claim 1, and it is characterized in that: also comprise interchanger B, interchanger B is connected with the lower end of described ethanol dehydration tower group.
3. the device of dehydrated alcohol is made in a kind of flushing-free circulation according to claim 1, and it is characterized in that: also comprise the light wine storage tank, the light wine storage tank is arranged between described vacuum buffer tank and described rectifying tower.
4. the device of dehydrated alcohol is made in a kind of flushing-free circulation according to claim 1, and it is characterized in that: also comprise interchanger C, interchanger C is arranged between the upper end branch road of described vacuum buffer tank and described ethanol dehydration tower group.
5. the device of dehydrated alcohol is made in a kind of flushing-free circulation according to claim 1, and it is characterized in that: also comprise interchanger A, interchanger A is arranged between the upper end and rectifying tower of described ethanol dehydration tower group.
6. the device of dehydrated alcohol is made in a kind of flushing-free circulation according to claim 3, it is characterized in that: also comprise interchanger B and interchanger C, interchanger B is connected with the lower end of described ethanol dehydration tower group, interchanger C is arranged between the upper end branch road of described vacuum buffer tank and described ethanol dehydration tower group, and described light wine storage tank is connected with described rectifying tower by interchanger B.
7. the device of dehydrated alcohol is made in a kind of flushing-free circulation according to claim 6, it is characterized in that: be provided with topping-up pump between described light wine storage tank and interchanger B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320002470 CN202989019U (en) | 2013-01-05 | 2013-01-05 | Flushing-free device for circularly manufacturing anhydrous ethanol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320002470 CN202989019U (en) | 2013-01-05 | 2013-01-05 | Flushing-free device for circularly manufacturing anhydrous ethanol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202989019U true CN202989019U (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320002470 Expired - Fee Related CN202989019U (en) | 2013-01-05 | 2013-01-05 | Flushing-free device for circularly manufacturing anhydrous ethanol |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202989019U (en) |
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2013
- 2013-01-05 CN CN 201320002470 patent/CN202989019U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SICHUAN TIANCAI TECHNOLOGY CO., LTD. Free format text: FORMER NAME: YALIAN SCIENCE AND TECHNOLOGY CO., LTD., SICHUAN |
|
| CP01 | Change in the name or title of a patent holder |
Address after: West high tech Zone Chengdu city Sichuan province 610000 City Road No. 399 Patentee after: Sichuan Tiancai Technology Co., Ltd. Address before: West high tech Zone Chengdu city Sichuan province 610000 City Road No. 399 Patentee before: Yalian Science and Technology Co., Ltd., Sichuan |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20160105 |