CN110342511A - A method of active carbon quality is improved using modified flying dust - Google Patents
A method of active carbon quality is improved using modified flying dust Download PDFInfo
- Publication number
- CN110342511A CN110342511A CN201910647446.6A CN201910647446A CN110342511A CN 110342511 A CN110342511 A CN 110342511A CN 201910647446 A CN201910647446 A CN 201910647446A CN 110342511 A CN110342511 A CN 110342511A
- Authority
- CN
- China
- Prior art keywords
- flying dust
- active carbon
- modified
- electric power
- power plant
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/336—Preparation characterised by gaseous activating agents
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The present invention provides a kind of method for improving active carbon quality using modified flying dust, which comprises provides biomass electric power plant flying dust；The biomass electric power plant flying dust is modified, to obtain the modification flying dust that potassium content is greater than preassigned；The modified flying dust is added in the raw material for being used to prepare active carbon；Active carbon is prepared using the raw material added with the modified flying dust.The present invention provides a kind of new way that biomass electric power plant flying dust utilizes, meets to biomass electric power plant flying dust secondary use, while significantly improving active carbon quality, improve the performance of activated carbon.
Description
Technical field
It is the present invention relates to biomass power generation and active carbon preparation field, in particular to a kind of to improve activity using modified flying dust
The method of charcoal quality.
Background technique
The shortage of resources and problem of environmental pollution to become increasingly conspicuous makes Devoting Major Efforts To Developing clean energy resource become urgent project, I
State's biomass energy is abundant, and biomass power generation by waste combustion has vast potential for future development.
Flying dust refers to the substance collected in recuperation of heat using system, flue gas purification system after biomass burning.The production of flying dust
Raw amount is related with rubbish type, burning condition, the burning type of furnace and flue gas treating process, generally accounts for about the 3%- of biomass burning amount
5% or so.Contain a large amount of pollutant in flying dust, if being such as directly entered environment without processing, it will migrate in the environment, not only
It can produce serious influence to environment, or even be also possible to enter human body by food chain, threaten human health.Therefore, it is necessary to open
Send out cheap, efficient technology carries out processing disposition to flying dust, reduce its to environment and human body generate harm.
As country payes attention to biomass energy, biomass direct combustion power generation project is more and more, lime-ash after biomass combustion
Utilization be also gradually taken seriously.The processing of especially biomass electric power plant flying dust influences prolonging for entire biomass direct-fired industrial chain
It is continuous.Current existing flying dust utilization ways are mainly soil improvement, production compound fertilizer auxiliary material, and building aspect application is several at present
Biomass electric power plant flying dust is not applied to the precedent of catalytic field.
Summary of the invention
A series of concept of reduced forms is introduced in Summary, this will in the detailed description section into
One step is described in detail.Summary of the invention is not meant to attempt to limit technical solution claimed
Key feature and essential features do not mean that the protection scope for attempting to determine technical solution claimed more.
In view of the deficiencies of the prior art, the present invention provides a kind of method for improving active carbon quality using modified flying dust, institute
The method of stating includes:
Biomass electric power plant flying dust is provided；
The biomass electric power plant flying dust is modified, to obtain the modification flying dust that potassium content is greater than preassigned；
The modified flying dust is added in the raw material for being used to prepare active carbon；
Active carbon is prepared using the raw material added with the modified flying dust.
In one embodiment, potassium content is greater than 5% in the modified flying dust.
In one embodiment, the raw material that the utilization is added with the modified flying dust prepare active carbon and include:
Charing process and activation processing successively are carried out to the raw material added with the modified flying dust.
In one embodiment, the temperature of the charing process is 400 DEG C~600 DEG C, and the temperature of the activation processing is
800 DEG C~1000 DEG C.
In one embodiment, the modified flying dust is added, in the charing process and described before the charing process
Institute is added, and/or is added to during the charing process and/or during the activation processing between activation processing
It states in raw material.
In one embodiment, described be modified to the biomass electric power plant flying dust includes:
Measure the content of the potassium and its oxide in the biomass electric power plant flying dust；
According to the content of the potassium and its oxide that measure, potassium hydroxide is added in Xiang Suoshu biomass electric power plant flying dust, so that
Potassium content in the biomass electric power plant flying dust is greater than preassigned；
The biomass electric power plant flying dust and the potassium hydroxide are uniformly mixed, and are ground to 50 mesh or more.
In one embodiment, the quality of added potassium hydroxide accounts for the 1% of the quality of the biomass electric power plant flying dust
~10%.
In one embodiment, used ratio of water to material is 0.5~3 during preparing the active carbon.
In one embodiment, the mass ratio of the modified flying dust and the raw material is 1~30%.
In one embodiment, the equipment for preparing the active carbon includes rotary furnace, tank reactor or moving bed, preparation
The equipment of the active carbon is external-heat equipment or internal heat type equipment.
The method provided by the invention for improving active carbon quality using modified flying dust provides a kind of biomass electric power plant flying dust
The new way utilized meets to biomass electric power plant flying dust secondary use, while significantly improving active carbon quality, improves activated carbon
Performance.
Detailed description of the invention
Following drawings of the invention is incorporated herein as part of the present invention for the purpose of understanding the present invention.Shown in the drawings of this hair
Bright embodiment and its description, principle used to explain the present invention.
In attached drawing:
Fig. 1 is the flow chart of the method that active carbon quality is improved using modified flying dust of one embodiment of the present of invention.
Specific embodiment
In the following description, a large amount of concrete details are given so as to provide a more thorough understanding of the present invention.So
And it is obvious to the skilled person that the present invention may not need one or more of these details and be able to
Implement.In other examples, in order to avoid confusion with the present invention, for some technical characteristics well known in the art not into
Row description.
In order to thoroughly understand the present invention, detailed method and step and/or structure will be proposed in following description.Obviously,
Execution of the invention is not limited to specific details appreciated by those skilled in the art.Presently preferred embodiments of the present invention is detailed
It is described as follows, however other than these detailed descriptions, the present invention can also have other embodiments.
It should be understood that the present invention can be implemented in different forms, and should not be construed as being limited to propose here
Embodiment.On the contrary, provide these embodiments will make it is open thoroughly and completely, and will fully convey the scope of the invention to
Those skilled in the art.In the accompanying drawings, for clarity, the size and relative size in the area Ceng He may be exaggerated.From beginning to end
Same reference numerals indicate identical element.
It should be understood that when the term " comprising " and/or " including " is used in this specification, indicating described in presence
Feature, entirety, step, operation, element and/or component, but do not preclude the presence or addition of other one or more features, entirety,
Step, operation, element, component and/or their combination." one " of singular, "one" and " described/should " be also intended to
Plural form, unless the context clearly indicates other mode.
As country payes attention to biomass energy, biomass direct combustion power generation project is more and more, the utilization of lime-ash after burning
Also it is gradually taken seriously.The processing of especially biomass electric power plant flying dust influences the continuity of entire biomass direct-fired industrial chain.At present
Existing flying dust utilization ways be mainly soil improvement, production compound fertilizer auxiliary material, building aspect application etc., and almost without
It is applied to catalytic field, by material modification as additive, the precedent of improvement activated carbon quality.And traditional active carbon preparation
Technique can only change ratio of water to material by activation time is extended to improve active carbon quality, relative cost is higher, if to prepare height
The active carbon of quality, then technique is relative complex, while yield is lower.
Based on this, the embodiment of the present invention provides a kind of novel method for improving active carbon quality using modified flying dust, will
Modified biomass electric power plant flying dust is added to preparing for active carbon and is used as additive in raw material, is improving the same of active carbon quality
When, additionally it is possible to guarantee the yield of active carbon.The method achieve the efficient coproduction of biomass power generation and active carbon preparation, effectively
Energy utilization rate is improved, environmental pollution caused by solving in process for preparing active carbon.
In order to thoroughly understand the present invention, detailed structure will be proposed in following description, to illustrate proposition of the present invention
Technical solution.Presently preferred embodiments of the present invention is described in detail as follows, however other than these detailed descriptions, the present invention can be with
With other embodiments.
It is done further below with reference to the method that using modified flying dust improves active carbon quality of the Fig. 1 to inventive embodiments
It is bright.
As shown in Figure 1, providing biomass electric power plant flying dust in step 101.
Wherein, the biomass electric power plant flying dust is the flying dust generated after biomass is burned, and the biomass refers to utilization
The various organisms that big gas and water, soil etc. are generated by photosynthesis.Illustratively, the biomass electric power plant flying dust is direct
It is derived from biomass direct-fired power plant, for example, it can be derived from the ash bucket etc. under flying dust warehouse or bag filter.Biomass is special
Structure and physicochemical property so that itself and plain cylindrical furnace flying dust is there is very big difference, mention it can as additive after modification
High activity charcoal quality.
In step 102, the biomass electric power plant flying dust is modified, to obtain the modification that potassium content is greater than preassigned
Flying dust (i.e. modified biomass flying ash in electric power plant).
Wherein, enough potassium contents can guarantee the reaming activity of flying dust, therefore carry out to the biomass electric power plant flying dust
Modified includes adding potassium compound thereto.In one embodiment, described that packet is modified to the biomass electric power plant flying dust
It includes: adding potassium hydroxide in the biomass electric power plant flying dust.Specifically, the potassium and its oxide in the flying dust are measured first
Content.Then, according to the content of the potassium and its oxide that measure in flying dust, a certain amount of potassium hydroxide is added, so that flying dust
In potassium content be greater than 5%, so as to ensure flying dust reaming activity.In one embodiment, added potassium hydroxide
Quality account for the 1%~10% of biomass electric power plant flying dust quality.
Further, after adding potassium hydroxide, further includes: mix potassium hydroxide and biomass electric power plant flying dust equal
It is even, and it is ground to 50 mesh or more.
In step 103, the modified flying dust is added in the raw material for being used to prepare active carbon.
Wherein, the raw material, which can be all, can prepare the raw material of active carbon.Further, the raw material can be with
Including plant raw material and mineral substance raw material.Plant raw material further comprise timber, sawdust, coconut husk etc.；Mineral substance
Raw material include coal, refinery products etc..
As an example, the mass ratio of added modified flying dust and the raw material is 1~30%, so that the modification flies
Ash preferably plays a role.
In step 104, active carbon is prepared using the raw material added with the modified flying dust.
Wherein, the technique for preparing active carbon includes activation processing and charing process.It illustratively, will be added with modified flying dust
Raw material first in retort by charing after generate carbonized material, carbonized material subsequently enters in activation furnace, at high temperature with
Vapor, CO2, air or flue gas (vapor, CO2、N2Deng gaseous mixture) etc. activated gas contact, carry out priming reaction system
Obtain active carbon.In embodiments of the present invention, carbonization temperature is 400~600 DEG C in process for preparing active carbon, activation temperature 800
~1000 DEG C.
The modified flying dust can be added in the raw material before the charing process, in the charing process and
The modified flying dust is added in the raw material between the activation processing, and/or, in the charing process and/or institute
The modified flying dust is added in the raw material during stating activation processing.The modified flying dust can once be added,
It can also be added several times.It is added after the modified flying dust, further includes that the modified flying dust and the raw material is sufficiently mixed
It closes.
Illustratively, the production equipment of active carbon is rotary furnace, and tank reactor and moving bed etc. can produce active carbon
All devices, including internal heat type equipment and external-heat equipment.
In one embodiment, preparing ratio of water to material used in the active carbon is 0.5~3.
In one embodiment, the tar and/or combustible gas that carbonizing apparatus and/or activation device generate can be passed through life
In substance combustion device, the combustible gas generated in charing and activation process is recycled, and with biomass electric power plant boiler
Energy efficient utilization and stable operation are realized in coupling.
In one embodiment, the high-temperature flue gas that biomass combustion device can be generated is passed through drying unit, charcoal makeup
It sets and/or activates in device.After the heat supply flue gas utilization of process for preparing active carbon is complete, into biomass electric power plant gas cleaning system
System, to reduce pollution.
In one example, the vapor that biomass boiler generates can be passed through in activation device.Wherein, vapor packet
Include biomass electric power plant exhaust steam in steam turbine.Active carbon Preparation equipment includes steam turbine and generator etc., and steam is passed through activation device
Process is: driving steam turbine running by generator, the steam that biomass boiler is generated is pumped into activation device.Activation process
Required vapor is derived from biomass electric power plant exhaust steam in steam turbine, it is possible to reduce equipment investment.
In one example, biomass electric power plant equipment includes flue gas purification device, and the flue gas that biomass boiler generates enters
It in flue gas purification device and is cleaned, in addition, high-temperature flue gas adds to drying unit, carbonizing apparatus and/or activation device
Enter in flue gas purification device after heat and is purified.After the heat supply flue gas utilization of process for preparing active carbon is complete, into biomass electricity
Factory's flue gas purification system, to reduce pollution.
In one example, biomass power generation by waste combustion and process for preparing active carbon can be carried out in the state of negative pressure, from
And reduce the pollution of process for preparing active carbon.
Two groups of control experiments are described below, intuitively to show generated effect according to the method for the embodiment of the present invention
Fruit:
Example one
The raw material prepared using wooden template as active carbon are carbonized 1 hour at 500 DEG C, carbonized material is made.It will
The carbonized material is divided into two parts, and a part does not add modified flying dust, raw material and vapor ratio be 1:3, temperature 850
The iodine number under conditions of DEG C, activating half an hour, active carbon being made, and measure active carbon is 763mg/g, yield 16.3%.Separately
A part addition accounts for 10% modification flying dust of raw material quality, after mixing, raw material and vapor ratio be 1:3,
Under conditions of temperature is 850 DEG C, half an hour is activated, active carbon is made, and measuring iodine number is 1044mg/g, yield 18.6%.
It can be seen that being increased substantially using the adsorptivity that the method for the embodiment of the present invention prepares resulting active carbon.
Example two
The raw material prepared using wood chip as active carbon are carbonized 1 hour at 500 DEG C, and carbonized material is made.Raw material with
Under conditions of vapor ratio 1:3, temperature are 850 DEG C, the carbonized material is activated into half an hour, active carbon is made, measured described
The iodine number of active carbon is 736mg/g, yield 16.4%.Separately equally take wood chip as raw material, addition first accounts for raw material matter
The flying dust of amount 10% carbonizes 1 hour at 500 DEG C after mixing, carbonized material is made, then in raw material and vapor ratio
Example 1:3, temperature activate half an hour under conditions of being 850 DEG C, and active carbon is made, and the iodine number for measuring the active carbon is 819mg/g,
Yield is 19.19%.It can be seen that using the method for the embodiment of the present invention prepare resulting active carbon adsorptivity and yield it is big
Amplitude improves.
The method according to an embodiment of the present invention for improving active carbon quality using modified flying dust has the advantages that
1, the additive for preparing modified biomass flying ash in electric power plant as active carbon has expanded the benefit of biomass electric power plant flying dust
With approach, can be sold modified biomass flying ash in electric power plant as product；
2, modified flying dust is added in process for preparing active carbon, can be improved the quality of active carbon；
3, modified flying dust is added in process for preparing active carbon, does not reduce activity while improving the quality of active carbon
Charcoal yield or even yield increase.
The present invention has been explained by the above embodiments, but it is to be understood that, above-described embodiment is only intended to
The purpose of citing and explanation, is not intended to limit the invention to the scope of the described embodiments.Furthermore those skilled in the art
It is understood that the present invention is not limited to the above embodiments, introduction according to the present invention can also be made more kinds of member
Variants and modifications, all fall within the scope of the claimed invention for these variants and modifications.Protection scope of the present invention by
The appended claims and its equivalent scope are defined.
Claims (10)
1. a kind of method for improving active carbon quality using modified flying dust, which is characterized in that the described method includes:
Biomass electric power plant flying dust is provided；
The biomass electric power plant flying dust is modified, to obtain the modification flying dust that potassium content is greater than preassigned；
The modified flying dust is added in the raw material for being used to prepare active carbon；
Active carbon is prepared using the raw material added with the modified flying dust.
2. the method according to claim 1, wherein potassium content is greater than 5% in the modified flying dust.
3. the method according to claim 1, wherein described utilize the former material for being added with the modified flying dust
Material prepares active carbon
Charing process and activation processing successively are carried out to the raw material added with the modified flying dust.
4. according to the method described in claim 3, it is characterized in that, the temperature of the charing process be 400 DEG C~600 DEG C, institute
The temperature for stating activation processing is 800 DEG C~1000 DEG C.
5. according to the method described in claim 3, it is characterized in that, the modified flying dust be added before the charing process,
It is added between the charing process and the activation processing, and/or during the charing process and/or at the activation
It is added to during reason in the raw material.
6. the method according to claim 1, wherein described be modified packet to the biomass electric power plant flying dust
It includes:
Measure the content of the potassium and its oxide in the biomass electric power plant flying dust；
According to the content of the potassium and its oxide that measure, potassium hydroxide is added in Xiang Suoshu biomass electric power plant flying dust, so that described
Potassium content in biomass electric power plant flying dust is greater than preassigned；
The biomass electric power plant flying dust and the potassium hydroxide are uniformly mixed, and are ground to 50 mesh or more.
7. according to the method described in claim 6, it is characterized in that, the quality of added potassium hydroxide accounts for the biomass electricity
The 1%~10% of the quality of factory's flying dust.
8. the method according to claim 1, wherein ratio of water to material used by during preparing the active carbon is
0.5~3.
9. the method according to claim 1, wherein the mass ratio of the modified flying dust and the raw material is 1
~30%.
10. the method according to claim 1, wherein the equipment for preparing the active carbon includes rotary furnace, autoclave
Reactor or moving bed, the equipment for preparing the active carbon are external-heat equipment or internal heat type equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910647446.6A CN110342511A (en) | 2019-07-17 | 2019-07-17 | A method of active carbon quality is improved using modified flying dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910647446.6A CN110342511A (en) | 2019-07-17 | 2019-07-17 | A method of active carbon quality is improved using modified flying dust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110342511A true CN110342511A (en) | 2019-10-18 |
Family
ID=68176658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910647446.6A Pending CN110342511A (en) | 2019-07-17 | 2019-07-17 | A method of active carbon quality is improved using modified flying dust |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110342511A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674346A (en) * | 2012-06-04 | 2012-09-19 | 新疆大学 | Process for preparing high-specific surface area composite pore structure coal-based activated carbon by using low dosage of KOH |
| CN103771407A (en) * | 2014-01-20 | 2014-05-07 | 中盈长江国际新能源投资有限公司 | Method for preparing super active carbon by taking biomass power plant ash as raw material |
| CN104163426A (en) * | 2014-08-18 | 2014-11-26 | 深圳市环境科学研究院 | Active carbon preparation method and giant reed active carbon |
| CN108046255A (en) * | 2018-01-23 | 2018-05-18 | 北京澳柯清洁煤气工程技术有限公司 | A kind of method that activated carbon is prepared using CFB fly ash and fine coal |
-
2019
- 2019-07-17 CN CN201910647446.6A patent/CN110342511A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674346A (en) * | 2012-06-04 | 2012-09-19 | 新疆大学 | Process for preparing high-specific surface area composite pore structure coal-based activated carbon by using low dosage of KOH |
| CN103771407A (en) * | 2014-01-20 | 2014-05-07 | 中盈长江国际新能源投资有限公司 | Method for preparing super active carbon by taking biomass power plant ash as raw material |
| CN104163426A (en) * | 2014-08-18 | 2014-11-26 | 深圳市环境科学研究院 | Active carbon preparation method and giant reed active carbon |
| CN108046255A (en) * | 2018-01-23 | 2018-05-18 | 北京澳柯清洁煤气工程技术有限公司 | A kind of method that activated carbon is prepared using CFB fly ash and fine coal |
Non-Patent Citations (1)
| Title |
|---|
| 崔静等: "KOH预处理除尘灰制备颗粒活性炭的实验研究", 《炭素技术》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105505414B (en) | A kind of solid refuse anaerobic catalytic thermocracking process | |
| CN103658157B (en) | Solid waste homogeneous modification gasification clean electric power generation processing method | |
| CN103951153B (en) | A kind of waste plastics and mud are mixed with the method and system of charcoal sorbing material | |
| CN100381352C (en) | Method and device for plasma producing hydrogen by using garbage biomass and water as raw material | |
| CN105505469B (en) | A kind of downdraft fixed bed gasification steam-electric power combined production device and technique | |
| CN108913175B (en) | Combined cycle system for treating organic wastewater based on waste biomass catalytic pyrolysis products and use method thereof | |
| CN107365593A (en) | A kind of method that antibiotic bacterium dregs prepare charcoal | |
| CN205235984U (en) | Low energy consumption saturation activated carbon regeneration system | |
| CN108176703B (en) | Harmless treatment method and system for multi-element waste | |
| CN106622121A (en) | Saturated activated carbon regeneration system with low energy consumption and method thereof | |
| CN104263398B (en) | A kind of municipal wastes produces the method for garbage derivatived fuel and diesel oil | |
| CN109628116A (en) | A kind of system that biomass power generation is coupled with active carbon preparation | |
| CN111004640A (en) | Household garbage pyrolysis carbonization disposal system and method | |
| CN110144228A (en) | A kind of clean coking production technology and system | |
| CN105351019A (en) | Power generation technique based on pyrolyzation and gasification of refuse derived fuel (RDF) prepared from household refuse and incineration of fuel gas | |
| CN204114952U (en) | RDF burning electricity generation system prepared by a kind of clean and effective rubbish | |
| CN205473608U (en) | Downdraft fixed bed gasification steam electric power coproduction device | |
| CN112680237A (en) | Horizontal type domestic garbage anaerobic pyrolysis carbonization device and method | |
| CN106732704B (en) | A kind of antigravity system reducing biomass char oil content in bio oil | |
| CN105542870A (en) | System for coproducing charcoal, gas, fluid and oil from biomass and production method | |
| CN110342511A (en) | A method of active carbon quality is improved using modified flying dust | |
| CN204113363U (en) | Domestic garbage is prepared the combustion gas of RDF pyrolysing gasification and is burned clean and effective power generation system | |
| CN201103916Y (en) | Exhaust-heat pre-heating fuel device for biomass gasified power generation | |
| CN101974351A (en) | Scale fixed bed biomass gasification power generation production technology and complete equipment | |
| CN104390220A (en) | Chemical engineering sludge treatment method and equipment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191018 |