CN103055666A - Method for removing nitric oxide in flue gas - Google Patents

Method for removing nitric oxide in flue gas Download PDF

Info

Publication number
CN103055666A
CN103055666A CN2011103225501A CN201110322550A CN103055666A CN 103055666 A CN103055666 A CN 103055666A CN 2011103225501 A CN2011103225501 A CN 2011103225501A CN 201110322550 A CN201110322550 A CN 201110322550A CN 103055666 A CN103055666 A CN 103055666A
Authority
CN
China
Prior art keywords
method
characterized
liquid
gas
according
Prior art date
Application number
CN2011103225501A
Other languages
Chinese (zh)
Inventor
陈建峰
张亮亮
王洁欣
孙倩
Original Assignee
北京化工大学
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 北京化工大学 filed Critical 北京化工大学
Priority to CN2011103225501A priority Critical patent/CN103055666A/en
Publication of CN103055666A publication Critical patent/CN103055666A/en

Links

Abstract

A method for removing nitric oxide in flue gas belongs to the technical field of super gravity. The method comprises the following steps of: starting a super-gravity reactor, regulating the rotation speed of a rotator to be 100-4000rpm; feeding an absorption liquid and a mixed gas containing NO (nitric oxide) into a super-gravity revolving bed reactor from a liquid phase inlet and a gas phase inlet respectively, wherein the absorption liquid flows from the inner edge of the rotator to the outer edge of the rotator under the action of centrifugal power, is in counter-current or cross-current contact with the gas in the super-gravity revolving bed reactor and carries out reaction, and thus the NO removing process is finished; the pH (potential of hydrogen) value of the absorption liquid is 5-10, the volume flow ratio of the gas and the liquid is (30-300):1, the pressure of the system during the absorption process is 0.1-4.0MPa, the temperature of the system is 10-80 DEG C, and the concentration of the complex absorption solution is 0.005-0.1mol/L. The removing rate of NO in the mixed gas reaches more than 85%. The method provided by the invention is low in equipment investment, is low in energy consumption, is environment-friendly and is non-corrosive to equipment.

Description

A kind of method that removes nitrogen oxides in effluent

Technical field

The present invention relates to a kind of with complex solution as absorbent, utilize high-gravity rotating bedly as reactor, remove the new method of NO in the industrial tail gas.The method can be used for the industrial discharge gas cleaning, is applicable to the separation that removes of NO in thermal power industry flue gas and the process industry tail gas, and belongs to the high-gravity technology field.

Background technology

Nitrogen oxide (NO x) refer to the compound that is only formed by nitrogen, two kinds of elements of oxygen.Nitrogen oxide as air pollutants often refers to NO and NO 2NOx discharge capacity maximum be heat power station, account for national NO xMore than 40% of total emission volumn.The nitrogen oxide complicated component of Thermal Power Generation Industry discharging, but wherein 90% direct emission is NO.The Thermal Power Generation Industry nitrogen oxide emission is huge, in the urgent need to control.Statistical analysis according to " the Chinese thermal power plant Emission Controlling Technology of Nitric Oxides project study report " of China environmental protection industry association and organization, the nitrogen oxide total amount of power plant emission in 2007 has increased to 8,400,000 tons, increased closely 40.6% than 597.3 ten thousand tons in 2003, accounted for 35%~40% of national nitrogen oxide emission.National nitrogen oxide emission reached 2,000 ten thousand tons in 2008, became the first in the world discharged nitrous oxides state.According to scholarly forecast, along with the quickening of the national economic development, population growth and urbanization process, Chinese nitrogen oxide emission will continue to increase.If without control, nitrogen oxide emission will reach 3,000 ten thousand tons at the year two thousand twenty, bring huge threat for China's atmospheric environment.Result of study shows that nitrogen oxide also can produce multiple secondary pollution except as the primary pollution injury health.Nitrogen oxide is the major reason that forms regional fine particles pollution and grey haze, has caused China's developed area atmospheric visibility increasingly to descend, and grey haze fate constantly increases.In addition, the increase of nitrogen oxide emission so that China's Acid Rain Pollution by sulfuric acid type to sulfuric acid and the compound transformation of nitric acid, nitrate ion in acid rain shared ratio from 1/10 of the eighties in last century progressively rise in recent years 1/3.The Eleventh Five-Year Plan period, the rapid growth of discharged nitrous oxides has aggravated the degradating trend of regional acid rain, partial offset China in the great efforts of paying aspect the sulfur dioxide reduction of discharging.

Selective catalytic reduction method (SCR) is the denitration method for flue gas of present main application.The method is to utilize the catalyst such as iron, vanadium, chromium, cobalt, nickel and alkali metal to utilize ammonia or urea that NOx is reduced to N when temperature is 200 ℃~450 ℃ 2But also there is certain defective in the method, for example contains SO in the flue gas 2, grit and water smoke, all unfavorable to catalytic reaction and catalyst, so adopt the SCR method must at first carry out flue gas ash removal and desulfurization, or select the catalyst that is not subject to the dirty flue gas pollution effect; To make simultaneously catalyst have certain activity, also higher flue-gas temperature must be arranged, so the method energy consumption be higher.Emptyingly after the ammonia that uses in the method in addition or the urea incomplete reaction be easy to cause secondary pollution.

In recent years, adopt complex solution that the wet denitration technical research that nitrogen oxides in effluent removes is extensively carried out.The reaction rate of complex solution and nitrogen oxide is very fast, and the complexing product can decompose and emits nitrogen oxide under certain conditions, thereby realizes that the enrichment utilization of nitrogen oxide and the regeneration cycle of absorbent use.Therefore, use complex solution to carry out the method that nitrogen oxides in effluent removes and be considered to the out of stock technology of a kind of very promising flue gas.Because the reaction rate of complex solution and nitrogen oxide is very fast, the mass transport process in the liquid phase becomes the key factor that affects removal of nitrogen oxide speed.Developing new reactor strengthens the vapour-liquid mass of this process and becomes the important prerequisite of this Technique Popularizing to industrial applications.

High-gravity technology is the new technology of utilizing the Elevated Gravity more much bigger than terrestrial gravitation acceleration that mass transfer, diabatic process and micro mixing are strengthened, produces the Elevated Gravity of simulating by rotation on earth and obtains.It can increase substantially the conversion ratio of reaction and selective, dwindles significantly the volume of reactor, simplifies technique, flow process, implementation procedure energy-efficient, reducing polluted emission.Research and analysis show, under Elevated Gravity, molecular diffusion between different sized molecules and interphase mass transfer process are all than in after the match faster of terrestrial gravitation, produce the contact of flowing in gas one liquid, liquid-liquid, the liquid one solid porous media of two-phase under the Elevated Gravity larger hundreds of times to thousand times than earth gravitational field, huge shearing force makes liquid crushing become nano level film, silk and drips, produce boundary huge and that upgrade fast, make and improve 1~3 order of magnitude in the traditional tower of interphase mass transfer speed ratio, mass transport process is greatly strengthened.About open in the patent (ZL95215430.7) of hypergravity swinging bed device before the applicant (Beijing University of Chemical Technology).On this basis, the applicant is also obtaining important progress aspect the application study of high-gravity technology, this technology from separate, the physical process of desorb is extended to chemical reaction process.As: propose in (CN101168115A) by removing CO in the conversion gas with Hot potassium carbonate solution, sodium hydroxide solution or the potassium hydroxide solution of interpolation activator as absorbent in " a kind of method that removes carbon dioxide in the conversion gas " 2But the employing high-gravity technology uses complex solution to carry out the research of denitrating flue gas as absorbent, and so far there are no both at home and abroad reports.

Summary of the invention

The purpose of this invention is to provide a kind of with supergravity reactor as consersion unit, with complex solution as absorbent, from gaseous mixture, remove the method for NO, the gaseous mixture that contains NO and absorbent adverse current or cross-flow in rotating packed bed reactor contact and react, and finish the subtractive process of NO.Because the NO in the flue gas more than 90% xBe NO, thus wet denitration for mainly be the removing of NO in the flue gas.

A kind of method that removes nitrogen oxides in effluent of the present invention is characterized in that, may further comprise the steps:

(a) open rotating packed bed reactor, and rotor speed is adjusted to 100~4000 rev/mins of predetermined values;

(b) absorbent and the gaseous mixture that contains NO are sent to the rotating packed bed reactor from liquid phase import and gas phase import respectively, absorbent flows to the rotor outer rim by the rotor inner edge under the effect of centrifugal force, contact with gas adverse current or cross-flow in rotating packed bed reactor and react, finish the subtractive process of NO.The pH value of absorption liquid is 5~10, is preferably 6~8, most preferably is 7.Gas-liquid by volume flow-rate ratio is 30~300: 1, is preferably 50~150: 1, more preferably 60~100: 1.The pressure of system is 0.1~4.0MPa during absorption, is preferably 0.1~1.0MPa, most preferably is 0.1MPa.The temperature of system is preferably 15~40 ℃ at 10~80 ℃, most preferably is 20~30 ℃.The concentration of complex compound absorption liquid is preferably 0.01~0.08mol/L at 0.005~0.1mol/L, most preferably is 0.03~0.05mol/L.

The removing in the separation method of N0 in the gaseous mixture provided by the invention, used is high-gravity rotating bed including, but not limited to hypergravity whirligigs such as RPB, deflector type, helical duct, a fixed rotor, rotating compact discs.The rotating speed of high-gravity rotating bed rotor is 100~4000 rev/mins, is preferably 1500~3500 rev/mins, most preferably is 2500~3200 rev/mins.

Absorbent of the present invention is complex solution or its mixture that contains ferrous iron or cobalt ions.When adopting complex solution as absorbent, used complex compound absorption liquid is including but not limited to [ethylenediamine tetra-acetic acid is ferrous] (Fe II[EDTA]), [Cobalt Edetate] (Co[EDTA]), [ethylenediamine cobalt] (Co[EN] 2), [amine second three acid ferrous] (Fe II[NTA]), [amine second three sour cobalts] (Co[NTA]), [EDDA is ferrous] (Fe II[EDDA]), [diethylene-triamine pentaacetic acid ferrous] (Fe II[DTPA]) etc.

In addition, when adopting complex solution as absorbent, used absorbent enters waste liquor storage tank through behind the supergravity reactor, prepares regeneration.

The invention effect:

The present invention can effectively remove separation with the NO in the unstripped gas, the removal efficiency of NO can reach more than 85% (volume) in the gaseous mixture, the technical method that removes NO in the absorption gaseous mixture that the present invention proposes, it is few to have equipment investment, that energy consumption is low, equipment takes up space is little, environmentally friendly, to equipment without advantages such as corrosion.

Description of drawings

Fig. 1 is process chart of the present invention

Wherein: 3-is high-gravity rotating bed for the import of 1-liquid phase import 2-gas phase

4-rotor 5-gaseous phase outlet 6-liquid-phase outlet

Specific embodiments

Below in conjunction with drawings and Examples embodiment of the present invention are further specified.Device therefor is publication (ZL95215430.7).

The reaction unit figure of a kind of embodiment of the present invention as shown in Figure 1.Open high-gravity rotating bedly 3, adjusting rotary speed is to desired speed.Absorbent is sprayed the inner edge of high-gravity rotating bed rotor 4 by liquid distribution trough via liquid phase inlet tube 1, the gaseous mixture that contains NO from a upper workshop section enters into rotating packed bed reactor via gas phase inlet tube 2, contact with absorption liquid adverse current or cross-flow in high-gravity rotating bed rotor, under the hypergravity condition, carry out removing of NO, then discharge from gaseous phase outlet 5, enter follow-up workshop section.Absorbent flows out from the liquid-phase outlet 6 that is positioned at the rotating packed bed reactor bottom.Adopt the concentration of NO in the flue gas analyzer on-line analysis rotating packed bed reactor exit gas.

Embodiment 1

Unstripped gas forms: NO and the N of 1000ppm (volume fraction meter) 2The mist that forms.

Absorbent is [ethylenediamine tetra-acetic acid is ferrous] (Fe II[EDTA]), the pH value is 7, concentration is 0.02mol/L.The regulating system temperature is 20 ℃, pressure is adjusted to 0.1Mpa, start rotating packed bed reactor, the regulating rotary rotor speed is 2825r/m, then open the by-pass valve control of liquid reactor import, absorbent is sprayed the inner edge of high-gravity rotating bed rotor 4 by liquid distribution trough via liquid phase inlet tube 1, the flow of regulating liquid is 2.65L/h, the gaseous mixture that contains NO from a upper workshop section enters into rotating packed bed reactor via gas phase inlet tube 2, with absorption liquid counter current contacting in high-gravity rotating bed rotor, under the hypergravity condition, carry out the capture of NO, then discharge from gaseous phase outlet 5, enter follow-up workshop section.The flow of gas is 0.39m 3/ h.Absorption liquid flows out from the liquid-phase outlet 6 that is positioned at the rotating packed bed reactor bottom.Adopt the concentration of NO in the flue gas analyzer on-line analysis rotating packed bed reactor exit gas.The concentration of exit gas NO is that the removal efficiency of 201, NO reaches 79.9%.

Embodiment 2-19

Technological process and step are with embodiment 1, and flow, rotor speed and the result of the test of the temperature of each embodiment, pressure, absorbent kind, absorbent pH value, concentration of absorbing, gas-liquid see Table 1.

Absorbent is [ethylenediamine tetra-acetic acid is ferrous] (Fe II[EDTA]), [diethylene-triamine pentaacetic acid ferrous] (Fe II[DTPA]), [ethylenediamine cobalt] (Co[EN] 2) etc. contain complex solution or its mixture of ferrous iron or cobalt central ion.

Operating temperature is 10~70 ℃, and pressure is 0.01~4MPa, and the pH value of absorbent is 5~10, and the concentration of absorbent is 0.005~0.1mol/L, and the volume flow ratio of absorbent and gaseous mixture is 30~300: 1.

The process conditions of each embodiment of table 1 and experimental result

Claims (10)

1. a method that removes nitrogen oxides in effluent is characterized in that, may further comprise the steps:
(a) open rotating packed bed reactor, and rotor speed is adjusted to 100~4000 rev/mins of predetermined values;
(b) complex compound absorption liquid and the gaseous mixture that contains NO are sent to the rotating packed bed reactor from liquid phase import and gas phase import respectively, absorbent flows to the rotor outer rim by the rotor inner edge under the effect of centrifugal force, contact with gas adverse current or cross-flow in rotating packed bed reactor and react, finish the subtractive process of NO; The pH value of absorption liquid is 5~10, and gas-liquid by volume flow-rate ratio is 30~300: 1, and the pressure of system is 0.1~4.0MPa during absorption, and the temperature of system is at 10~80 ℃, and the concentration of complex compound absorption liquid is at 0.005~0.1mol/L.
2. according to the method for claim 1, it is characterized in that the complex compound absorption liquid is complex solution or its mixture that contains ferrous iron or cobalt ions.
3. according to the method for claim 2, it is characterized in that complex compound is selected from ethylenediamine tetra-acetic acid ferrous iron, Cobalt Edetate, ethylenediamine cobalt, amine second three acid ferrous irons, amine second three sour cobalts, EDDA is ferrous, diethylene-triamine pentaacetic acid is ferrous.
4. according to the method for claim 1, it is characterized in that described high-gravity rotating bed RPB, deflector type, helical duct, a fixed rotor, the rotating compact disc hypergravity whirligig of being selected from.
5. according to the method for claim 1, it is characterized in that the pH value 6~8 of absorption liquid.
6. according to the method for claim 1, it is characterized in that gas-liquid by volume flow-rate ratio is 50~150: 1.
7. according to the method for claim 1, it is characterized in that the pressure of system is 0.1~1.0Mpa during absorption.
8. according to the method for claim 1, it is characterized in that the temperature of system is 15~40 ℃.
9. according to the method for claim 1, it is characterized in that the concentration of complex compound absorption liquid is 0.01~0.08mol/L.
10. according to the method for claim 1, it is characterized in that the rotating speed of high-gravity rotating bed rotor is 1500~3500 rev/mins.
CN2011103225501A 2011-10-21 2011-10-21 Method for removing nitric oxide in flue gas CN103055666A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011103225501A CN103055666A (en) 2011-10-21 2011-10-21 Method for removing nitric oxide in flue gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011103225501A CN103055666A (en) 2011-10-21 2011-10-21 Method for removing nitric oxide in flue gas

Publications (1)

Publication Number Publication Date
CN103055666A true CN103055666A (en) 2013-04-24

Family

ID=48098739

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011103225501A CN103055666A (en) 2011-10-21 2011-10-21 Method for removing nitric oxide in flue gas

Country Status (1)

Country Link
CN (1) CN103055666A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103432889A (en) * 2013-09-06 2013-12-11 余国贤 Method for denitration of complexing ferroporphyrin smoke based on supergravity
CN103432877A (en) * 2013-09-06 2013-12-11 余国贤 Integrated method for wet-process dust removal, desulfurization, denitrification demercuration, dearsenification of complexing ferroporphyrin smoke based on supergravity
CN103432879A (en) * 2013-09-06 2013-12-11 余国贤 Method for desulfurization and denitrification of complexing ferroporphyrin smoke based on supergravity
CN103521160A (en) * 2013-09-29 2014-01-22 北京化工大学 Multifunctional and multipurpose multistage rotary packed bed reactor device and method for performing multiphase and multicomponent reaction by using device
CN104772026A (en) * 2015-04-07 2015-07-15 王文树 Smoke absorber
CN105854542A (en) * 2016-05-23 2016-08-17 天津市思茂阁科技有限责任公司 Method for purifying nitrogen-containing oxide tail gas
CN106582239A (en) * 2016-12-19 2017-04-26 北京化工大学 Device for treating hydrazine-containing waste gas in aircraft emergency power system and application of device
CN107303463A (en) * 2016-04-25 2017-10-31 云南民族大学 The innoxious removing low concentration of NO of high-gravity technologyxMethod
CN107303459A (en) * 2016-04-25 2017-10-31 云南民族大学 The innoxious removing low concentration of NO of high-gravity technologyxDevice
TWI613003B (en) * 2015-12-08 2018-02-01 國立清華大學 Apparatus for absorbing a component from a gas mixture

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1428189A (en) * 2001-12-28 2003-07-09 中国石油化工股份有限公司 High-pressure rotary bed gas-liquid mass-transferring and reaction equipment in superheavy force field

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1428189A (en) * 2001-12-28 2003-07-09 中国石油化工股份有限公司 High-pressure rotary bed gas-liquid mass-transferring and reaction equipment in superheavy force field

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
MA LEFAN ET.AL: "Removal of NOx from Flue Gas with Iron Filings Reduction Following Complex Absorption in Ferrous Chelates Aqueous Solutions", 《JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION》 *
李鹏等: "旋转填料床治理氮氧化物废气的研究", 《化工科技》 *
李鹏等: "超重力技术治理火炸药行业氮氧化物的初步研究", 《环境污染与防治》 *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103432889A (en) * 2013-09-06 2013-12-11 余国贤 Method for denitration of complexing ferroporphyrin smoke based on supergravity
CN103432877A (en) * 2013-09-06 2013-12-11 余国贤 Integrated method for wet-process dust removal, desulfurization, denitrification demercuration, dearsenification of complexing ferroporphyrin smoke based on supergravity
CN103432879A (en) * 2013-09-06 2013-12-11 余国贤 Method for desulfurization and denitrification of complexing ferroporphyrin smoke based on supergravity
CN103432879B (en) * 2013-09-06 2015-07-29 余国贤 The method of the ferrous flue gas desulfurization and denitrification of hypergravity complexing
CN103432877B (en) * 2013-09-06 2015-11-25 武汉国力通能源环保有限公司 The method of hypergravity complexing ferrous flue-gas wet dust removal desulfurization denitration demercuration dearsenification integration
CN103432889B (en) * 2013-09-06 2016-02-17 武汉国力通能源环保股份有限公司 The method of the ferrous denitrating flue gas of hypergravity complexing
CN103521160A (en) * 2013-09-29 2014-01-22 北京化工大学 Multifunctional and multipurpose multistage rotary packed bed reactor device and method for performing multiphase and multicomponent reaction by using device
CN104772026A (en) * 2015-04-07 2015-07-15 王文树 Smoke absorber
CN104772026B (en) * 2015-04-07 2016-07-27 王文树 Flue dust absorber
TWI613003B (en) * 2015-12-08 2018-02-01 國立清華大學 Apparatus for absorbing a component from a gas mixture
CN107303463A (en) * 2016-04-25 2017-10-31 云南民族大学 The innoxious removing low concentration of NO of high-gravity technologyxMethod
CN107303459A (en) * 2016-04-25 2017-10-31 云南民族大学 The innoxious removing low concentration of NO of high-gravity technologyxDevice
CN105854542A (en) * 2016-05-23 2016-08-17 天津市思茂阁科技有限责任公司 Method for purifying nitrogen-containing oxide tail gas
CN105854542B (en) * 2016-05-23 2018-09-07 天津市思茂阁科技有限责任公司 A method of purification nitrogen-containing oxide tail gas
CN106582239A (en) * 2016-12-19 2017-04-26 北京化工大学 Device for treating hydrazine-containing waste gas in aircraft emergency power system and application of device
CN106582239B (en) * 2016-12-19 2019-06-11 北京化工大学 A kind of device and its application for aircraft emergency power system hydrazine exhaust-gas treatment

Similar Documents

Publication Publication Date Title
Zhao et al. Post-combustion CO2 capture by aqueous ammonia: A state-of-the-art review
Galindo et al. Experimental research on the performance of CO2-loaded solutions of MEA and DEA at regeneration conditions
Liu et al. Simultaneous absorption of SO2 and NO from flue gas using ultrasound/Fe2+/heat coactivated persulfate system
Resnik et al. Aqua ammonia process for simultaneous removal of CO2, SO2 and NOx
CN101422691B (en) Multi-pollutant removing technique and device of fuel coal smoke
CN103223292B (en) Ammonia process flue gas treatment method for acidic tail gas and device
Cheng et al. Removal of CO2 from indoor air by alkanolamine in a rotating packed bed
Sun et al. Simultaneous absorption of NOx and SO2 from flue gas with pyrolusite slurry combined with gas-phase oxidation of NO using ozone
CN102000486B (en) Method for catching carbon dioxide in flue gas by active sodium carbonate and apparatus thereof
CN101745305B (en) Method for removing various gaseous pollutants from smoke gas
CN102350197B (en) Fume desulfurizing and denitrifying device based on magnesia and method
CN103230733B (en) The device of a kind of liquid phase catalytic oxidation flue gas desulfurization and denitrification integration and technique
WO2016150302A1 (en) Desulfurization and denitration agent
CN102997697A (en) Sinter waste-heat utilization process based on purification of sintering flue gas
CN102247750B (en) Method for simultaneously desulfurizing and denitrifying flue gas by ozone catalytic oxidation process
CN102343212B (en) Denitration process combining co-oxidation of ozone and hydrogen peroxide with wet absorption
CN1321723C (en) Method of separating and recovering sulfur dioxide in smoke using ammonia method
CN102908883B (en) A kind of flue gas and desulfurizing and denitrifying method
CN100430113C (en) Process and apparatus for eliminating fume SO2 from waste coking ammonia water of iron and steel and coal chemical enterprise
CN101564640B (en) Combined removal method for contaminants from coal-fired flue gas and special purification reactor thereof
CN103394279B (en) System device and method for deeply removing nitric oxide in industrial tail gas
Yu et al. CO2 capture by piperazine mixed with non-aqueous solvent diethylene glycol in a rotating packed bed
CN105344235B (en) A kind of coal-burned industrial boiler absorbs NOx and SO simultaneously2Device and method
CN101352647A (en) Simultaneous desulfuration and denitration technique by wet flue gas method
US20160074804A1 (en) Absorption medium, process for producing an absorption medium, and also process and apparatus for separating hydrogen sulfide from an acidic gas

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20130424