CN101732947B - Method for safe adsorption and enrichment of gas with low concentration - Google Patents
Method for safe adsorption and enrichment of gas with low concentration Download PDFInfo
- Publication number
- CN101732947B CN101732947B CN 201010034206 CN201010034206A CN101732947B CN 101732947 B CN101732947 B CN 101732947B CN 201010034206 CN201010034206 CN 201010034206 CN 201010034206 A CN201010034206 A CN 201010034206A CN 101732947 B CN101732947 B CN 101732947B
- Authority
- CN
- China
- Prior art keywords
- adsorption
- gas
- methane
- oxygen
- low
- 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.)
- Expired - Fee Related
Links
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 34
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 95
- 239000007789 gas Substances 0.000 claims abstract description 79
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000001301 oxygen Substances 0.000 claims abstract description 33
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 33
- 239000003463 adsorbent Substances 0.000 claims abstract description 25
- 238000003795 desorption Methods 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 17
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 239000002808 molecular sieve Substances 0.000 claims description 9
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 5
- 229910021536 Zeolite Inorganic materials 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- 239000010457 zeolite Substances 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims 1
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 14
- 239000005431 greenhouse gas Substances 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000004880 explosion Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000000274 adsorptive effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000012621 metal-organic framework Substances 0.000 description 3
- 244000287680 Garcinia dulcis Species 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/20—Capture or disposal of greenhouse gases of methane
Landscapes
- Separation Of Gases By Adsorption (AREA)
Abstract
本发明提供了一种低浓度瓦斯安全吸附富集的方法。它是通过变压吸附的方法，从解吸阶段获得产品气。为了保证吸附过程中的安全，吸附过程中甲烷和氧气同时被吸附，其体积分数保证在安全范围以内，其中甲烷体积分数低于5％，氧气体积分数低于9.47％。本发明中吸附塔内使用吸附剂为主要吸附甲烷和主要吸附氧气的混合吸附剂。本发明中控制吸附压力在0.9MPa以内。本发明可以将抽放的煤矿低浓度瓦斯富集利用，同时可以减少温室气体的排放。
The invention provides a method for safe adsorption and enrichment of low-concentration gas. It obtains the product gas from the desorption stage by means of pressure swing adsorption. In order to ensure the safety of the adsorption process, methane and oxygen are simultaneously adsorbed during the adsorption process, and their volume fractions are guaranteed to be within a safe range, wherein the volume fraction of methane is less than 5%, and the volume fraction of oxygen is less than 9.47%. The adsorbent used in the adsorption tower in the present invention is a mixed adsorbent that mainly absorbs methane and mainly absorbs oxygen. In the present invention, the adsorption pressure is controlled within 0.9 MPa. The invention can enrich and utilize the drained coal mine low-concentration gas, and can reduce the emission of greenhouse gases at the same time.
Description
Technical field
The invention belongs to the PSA Gas Separation Technology field, especially relate to a kind of method of light concentration mash gas safety enrichment, be used for safe enrichment and the utilization of colliery drawing-off gas.
Background technology
The content of methane is generally 20～45% in the coal bed gas, and 2000 meters in China is approximately 300,000～35 tcms with interior shallow-layer coal bed gas resource amount, and is similar with the total resources of natural gas, occupies the third place in the world.At present, the coal bed gas that China discharges because mining every year accounts for 1/3 of world's coal mining discharging coal bed gas total amount more than 130 billion cubic meters, rank first in the world.China's " safety regulations in coal mine " regulation, the methane volume fraction must not be lower than 30% during gas utilization, and volume fraction is lower than 25% coal bed gas and must not utilizes.The at present industrial way processing methane volume fraction of burning destruction or diffusing that often adopts is lower than 25% coal bed gas, has not only wasted a large amount of high-grade energies, and has caused the discharging of greenhouse gases.Therefore, how with the methane gas separating and concentrating of low concentration, become the major issue of cbm development.
Gas explosion is one of the major casualty in colliery.The volume fraction of methane and oxygen has explosivity in certain scope, generally adopt in the world the explosive range of Coward triangle pair fuel gas to differentiate.Patent 200810101910.3,200810101907.1,200810101908.6 discloses the methane explosion triangle schematic diagram after the expansion shown in Figure 1, among the figure whole concentration range is divided into explosibility district and non-blast area.Wherein the zone in the triangle L ' NV ' is the zone that can blast, and its mid point V is the critical explosion point, and its coordinate is (5.18,9.47).Straight line NVV ' is the UEL of methane under the different oxygen purities, and corresponding methane and oxygen purity close and be: Y=1.181X
O2-6.0.Straight line L ' LN is the LEL of methane under the different oxygen purities, and corresponding methane and oxygen purity close and be: Y=5.344-0.0713X
O2
Separating coal bed gas with Deep Cooling Method, can to obtain volume fraction be methane gas more than 95%.But need gas is added high pressure in the deep cooling process, and the aerial UEL of methane increases along with the increase of pressure, the UEL of methane has brought up to 42.5% when coal bed gas pressure reaches 2.5Mpa.In order to guarantee the safety of separation process, need to carry out in advance deoxidation treatment when Deep Cooling Method is separated gas, and the content of oxygen is very high in the low concentration gas, oxygen purity then needs to increase a large amount of investments greater than 14.7% to low concentration gas qi exhaustion oxygen.Chinese patent 200810101910.3,200810101907.1,200810101908.6 discloses a kind of method for the coalbed methane containing oxygen cryogenic separation, the volume fraction of this separation method control methane, oxygen, nitrogen ternary gas and and operating process in temperature guarantee to be positioned at outside the explosion triangle all the time in the separation process.Separation by deep refrigeration operating process more complicated, equipment investment and energy consumption are all larger, only have scale to reach and just are fit to after sizable degree use.At present, Deep Cooling Method is not yet being seen plant-scale application example aspect the low concentration gas separation.Membrane separation process is simple, easy to operate, with low cost, non-secondary pollution, but the effect that film separates is strong to the masking technique dependence, and film itself may exist easily and silt up, fragile, the problem such as service life is short, and technical also have the larger space of improving.Aspect the film separation, the large-scale membrane separation process that relates to methane in the mist still is in the development phase, and particularly the CH4/N2 system is not also having successful report aspect the film separation.
Pressure-variable adsorption is owing to the advantages such as investment is little, and operating cost is low are being paid close attention to aspect the gas separation field widely.Patent CN85103557A has described a kind of technology of pressure-swing adsorption concentration coal mine gas, take active carbon as adsorbent, is can be with more than the methane concentrate to 95% under the condition of 0.5-1.0MPa at adsorptive pressure.Adopting this technology to build up China's first set processing coal bed gas tolerance in Jiaozhuo, Henan mineral bureau is 1.2 ten thousand m
3The concentrated commerical test device in/sky is successfully with the CH in the coal bed gas
4Volume fraction brings up to 63.9% from 30.4%, increase displacement step after, can further improve 99.4%.Because adsorptive pressure is large, and has potential safety hazard in adsorption process, this technology is not promoted.The low concentration gas oxygen content is high, uses in the pressure-variable adsorption separation process that any gas all can't guarantee to avoid in the operating process explosion triangle in the single adsorption agent adsorption gas gas, and the enrichment for low concentration gas both at home and abroad all lacks research.The method that the present invention mixes by adsorbent, pro rata absorption mist guarantees the safe operation of pressure-variable adsorption separation process.
Summary of the invention
In order to solve the deficiency that enters easily the gas explosion limit in the pressure-variable adsorption enrichment gas process, the invention provides the method for a kind of low concentration gas (the methane volume fraction is less than 30%) safe adsorption and enrichment.The method can safety be more than the low-concentration methane gas concentrate to 30% 20% or more with volume fraction, and the rate of recovery is above 80%.
The technical solution adopted for the present invention to solve the technical problems is: propose a kind of method of safe adsorption and enrichment of gas with low concentration, realize the enrichment of low-concentration methane gas by the method for Vacuum Pressure Swing Adsorption.The adsorbent that loads in the adsorption tower in the described vacuum pressure swing absorption process is mixed adsorbent.Described mixed adsorbent is the adsorbent of main adsorption of oxygen and the adsorbent of main adsorbed methane gas.The adsorbent of described main adsorption of oxygen is carbon molecular sieve, zeolite molecular sieve and MOF (metal-organic framework materials), and the adsorbent of described main adsorbed methane is active carbon, zeolite molecular sieve and MOF.The mixed proportion of described mixing and absorption adsorbent is: the scope of the adsorbent mass of the adsorbent mass of main adsorption of oxygen/main adsorbed methane is 9: 1～1: 2.
Described pressure-changing process flow mainly comprise boost, adsorb, all pressure, depressurization desorption, cleaning five steps.Described pressure swing adsorption technique parameter is as follows: adsorptive pressure is controlled within 0.1MPa～0.9MPa, and depressurization desorption pressure is controlled within 0.01MPa～0.1MPa.In the described pressure-swing absorption process, low-concentration methane gas under high pressure flows into adsorption tower, the pro rata adsorbed methane of mixed adsorbent and oxygen, and the gas that is not adsorbed flows out from the exhaust end of adsorption tower.Methane volume fraction and oxygen purity reduce simultaneously at the absorption mass-transfer zone in the adsorption process, and the methane volume fraction required to remain on below 5% when gas flowed out from exhaust end, and oxygen purity requires to remain on below 9.47%.
The invention has the beneficial effects as follows:
1) uses mixed adsorbent simultaneously adsorbed methane and oxygen, can guarantee the safe operation of separation process;
By the method extracting low-concentration gas of pressure-variable adsorption, its initial cost is low, and operating cost is low, flexible and convenient operation;
2) contain partial oxidation in the stripping gas, can reduce the air of sneaking into when gas product uses, improve the quality of gas product;
3) the present invention can make drawing-off gas be fully utilized, and reduces the methane gas discharging to the pollution of environment, has great economy and environment meaning.
Description of drawings
Fig. 1 is the methane explosion triangle schematic diagram after the expansion;
Fig. 2 is process chart of the present invention.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
An embodiment of the method for safe adsorption and enrichment of gas with low concentration of the present invention as shown in Figure 2, unstripped gas flows into adsorption towers 3 by compressor 1 compression through air inlet surge tank 2 and control valve 4.Behind the methane and oxygen in the adsorbent absorption unstripped gas in the adsorption tower 3, discharging gas flows out from the exhaust end of adsorption tower, enters atmosphere behind throttling 5 of flowing through successively, control valve 4, check valve 6, exhaust surge tank 7, the flow control valve 8.After absorption finished, gas product was extracted out from adsorption tower 3 by vavuum pump 9.
The low-concentration methane gas component is as follows in the present embodiment: the methane volume fraction is 20%, and oxygen purity is 16.8%, and the nitrogen volume fraction is 64.2%.Mixed adsorbent is the mixed adsorbent of active carbon and carbon molecular sieve in the present embodiment, and carbon molecular sieve is 3.6: 1 with the ratio of quality of activated carbon.Technological parameter is as follows in the present embodiment: the highest adsorptive pressure is 320kPa (absolute pressure) after the compressed machine compression of unstripped gas, minimum parsing pressure 25 kPa (absolute pressure).Stripping gas and discharging gas constituent are as follows in the present embodiment:
Stripping gas methane volume fraction: 33.1%
Stripping gas oxygen purity: 21%
Discharging gas methane volume fraction: 2.9%
Discharging gas oxygen purity: 8.9%
Stripping gas and discharging gas all not in explosive range, have been realized the safe operation of adsorption separation process in this case study on implementation.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010034206 CN101732947B (en) | 2010-01-13 | 2010-01-13 | Method for safe adsorption and enrichment of gas with low concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010034206 CN101732947B (en) | 2010-01-13 | 2010-01-13 | Method for safe adsorption and enrichment of gas with low concentration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101732947A CN101732947A (en) | 2010-06-16 |
| CN101732947B true CN101732947B (en) | 2013-05-01 |
Family
ID=42457284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010034206 Expired - Fee Related CN101732947B (en) | 2010-01-13 | 2010-01-13 | Method for safe adsorption and enrichment of gas with low concentration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101732947B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102389685B (en) * | 2011-10-11 | 2014-04-09 | 北京科技大学 | Coal mine methane gas enriching method comprising step of pumping at exhaust end of adsorption tower |
| CN105312026B (en) * | 2014-07-09 | 2017-10-31 | 江苏瑞丰科技实业有限公司 | Normal temperature methane efficient absorption material |
| CN105201546B (en) * | 2015-09-21 | 2017-05-17 | 河南理工大学 | Device and method for improving gas extraction concentration |
| CN106669636B (en) * | 2015-11-11 | 2019-08-27 | 中国科学院大连化学物理研究所 | A kind of structured adsorbent and its application |
| CN110368803B (en) * | 2019-07-22 | 2021-10-22 | 煤科集团沈阳研究院有限公司 | A kind of gas absorbent and its preparation method and application |
| CN111258192A (en) * | 2020-02-11 | 2020-06-09 | Tcl华星光电技术有限公司 | Photoresist stripping device and photoresist stripping method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5229089A (en) * | 1991-11-06 | 1993-07-20 | The Boc Group, Inc. | Recovery of flammable materials from gas streams |
| EP0722764A2 (en) * | 1995-01-23 | 1996-07-24 | The Boc Group, Inc. | Recovery of hydrocarbons from gas streams |
| CN101503335A (en) * | 2009-02-17 | 2009-08-12 | 杨皓 | Method for concentrating methane by gas pressure swing adsorption of low concentration methane |
| CN101596391A (en) * | 2009-06-05 | 2009-12-09 | 安徽理工大学 | A method for fractional concentration of low-concentration gas pressure swing adsorption |
-
2010
- 2010-01-13 CN CN 201010034206 patent/CN101732947B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5229089A (en) * | 1991-11-06 | 1993-07-20 | The Boc Group, Inc. | Recovery of flammable materials from gas streams |
| EP0722764A2 (en) * | 1995-01-23 | 1996-07-24 | The Boc Group, Inc. | Recovery of hydrocarbons from gas streams |
| CN101503335A (en) * | 2009-02-17 | 2009-08-12 | 杨皓 | Method for concentrating methane by gas pressure swing adsorption of low concentration methane |
| CN101596391A (en) * | 2009-06-05 | 2009-12-09 | 安徽理工大学 | A method for fractional concentration of low-concentration gas pressure swing adsorption |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101732947A (en) | 2010-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101732947B (en) | Method for safe adsorption and enrichment of gas with low concentration | |
| CN105879577A (en) | Coalbed methane deoxidation and concentration method and device based on nitrogen displacement | |
| CN101596391B (en) | Method for pressure swing adsorption and staged concentration of low concentration gas | |
| CN103521033B (en) | The method for purifying and recovering of time anger in a kind of fire flood | |
| CN101628198A (en) | Pressure-swing adsorption method of directly enriching methane from coal bed gas | |
| CN103801171B (en) | A kind of two-stage series connection swing adsorption oxygen generating system and method for operating thereof improving oxygen recovery rate | |
| CN107694284A (en) | A multi-tower replacement vacuum pressure swing adsorption method for concentrating coal bed methane methane | |
| CN104986735B (en) | A kind of method for improving hydrogen recovery rate | |
| CN103861422B (en) | A kind of concentrate is containing the new process of methane in oxygen coal-bed gas gas | |
| CN103768891B (en) | A kind of two-stage series connection swing adsorption oxygen generating system and method for operating thereof that can improve oxygen recovery rate | |
| CN103071364A (en) | System and method for trapping carbon dioxide from flue gases in multi-stage manner | |
| CN109012030A (en) | It is a kind of based on product gas methane displacement coal bed gas deoxidation denitrogenate method for concentration and device | |
| AU2015281014A1 (en) | Gas concentration method | |
| CN111773882B (en) | Micro positive pressure vacuum pressure swing adsorption system and method for safe concentration of low concentration gas | |
| CN102380285B (en) | Method and device for concentrating coal mine exhaust gas by multi-tower vacuum pressure swing adsorption method | |
| CN210613298U (en) | System device for concentrating methane by pressure swing adsorption of low-concentration gas in coal mine | |
| CN201924909U (en) | Coalbed gas separation device | |
| CN113797704B (en) | A kind of low-concentration gas safe and high-efficiency cascade purification method and system for producing natural gas | |
| CN202237712U (en) | Device for concentrating coal mine ventilation air methane through multi-tower vacuum pressure swing adsorption method | |
| CN102389685A (en) | Coal mine methane gas enriching method comprising step of pumping at exhaust end of adsorption tower | |
| CN110394026A (en) | Large scale pressure swing adsorption cascade air separation unit | |
| CN109126380B (en) | A coal mine gas enrichment device with air boosting at the exhaust end and method thereof | |
| CN211585920U (en) | Large-scale pressure swing adsorption step air separation device | |
| CN216604669U (en) | Device for recovering high-purity hydrogen by utilizing styrene dehydrogenation tail gas | |
| CN202237711U (en) | Coal mine ventilation air methane enrichment device with adsorption tower exhaust end pumping step |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: SHIDAI TAOYUAN ENVIRONMENT SCIENCE AND TECHNOLOGY |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Liu Yingshu Inventor after: Zhang Chuanzhao Inventor after: Cao Hongcheng Inventor after: Zhang Dexin Inventor after: Yang Xiong Inventor after: Li Yongling Inventor after: Yang Junhua Inventor after: Zhang Hui Inventor after: Song Yanmin Inventor after: Liu Wenhai Inventor after: Guo Guangdong Inventor after: Meng Yu Inventor before: Liu Yingshu Inventor before: Zhang Dexin Inventor before: Yang Xiong Inventor before: Li Yongling Inventor before: Zhang Hui Inventor before: Liu Wenhai Inventor before: Guo Guangdong Inventor before: Meng Yu Inventor before: Zhang Chuanzhao Inventor before: Cao Hongcheng |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LIU YINGSHU YANG XIONG LI YONGLING ZHANG HUI LIU WENHAI GUO GUANGDONG MENGYU ZHANG ZHUANZHAO CAO HONGCHENG ZHANG DEXIN TO: LIU YINGSHU YANG XIONG LI YONGLING YANG JUNHUA ZHANG HUI SONG YANMIN LIU WENHAI GUO GUANGDONG MENG YU ZHANG ZHUANZHAO CAO HONGCHENG ZHANG DEXIN |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20110525 Address after: 100083 Haidian District, Xueyuan Road, No. 30, Applicant after: University of Science and Technology Beijing Co-applicant after: Shidai Taoyuan Environment Science and Technology Co., Ltd., Beijing Address before: 100083 Haidian District, Xueyuan Road, No. 30, Applicant before: University of Science and Technology Beijing |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20140113 |
|
| DD01 | Delivery of document by public notice |
Addressee: Beijing times Taoyuan Environment Technology Co., Ltd. Finance Document name: Notification of Approving Refund |