CN103965931B - A kind of preparation method of modified pitch - Google Patents
A kind of preparation method of modified pitch Download PDFInfo
- Publication number
- CN103965931B CN103965931B CN201310036508.2A CN201310036508A CN103965931B CN 103965931 B CN103965931 B CN 103965931B CN 201310036508 A CN201310036508 A CN 201310036508A CN 103965931 B CN103965931 B CN 103965931B
- Authority
- CN
- China
- Prior art keywords
- coal
- uncombined carbon
- preparation
- tar
- modified pitch
- 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.)
- Active
Links
Abstract
The invention provides a kind of preparation method of modified pitch, belong to pitch preparing technical field.The method comprises the steps: coal tar or coal-tar pitch to mix with uncombined carbon or containing the component of uncombined carbon, obtains modified pitch after reacting by heating.The advantage that the modified pitch prepared by the preparation method of modified pitch of the present invention has viscosity and softening temperature is low, mobility is high, the plain amount of fixed carbon is high.In addition, by adding the component containing uncombined carbon, the density of modified pitch becomes large, and the modified pitch therefore prepared also has highdensity advantage.
Description
Technical field
The present invention relates to a kind of preparation method of modified pitch, belong to pitch preparing technical field.
Background technology
Along with the development of carbon technique, in order to produce high performance carbon cellulose product, as superpower and ultra-high power graphite electrode, high-density and high-strength graphite, hot press moulding carbon brick and micropore carbon brick etc., the performance of coal-tar pitch is had higher requirement.Modified pitch is the high-performance pitch obtained after carrying out modifying process to coal-tar pitch under certain condition.Modified pitch is compared with coal-tar middle oil pitch, and the β resin content in modified pitch improves greatly.After roasting, the most of β resin in modified pitch can be converted into coke, improves the fixed carbon content of modified pitch.And after fixed carbon content improves, the volume density of the carbon product after modified pitch roasting, physical strength and conductivity can be greatly improved.Because modified pitch has above-mentioned excellent properties, therefore the modifying process of coal-tar pitch is more and more valued by the people.
Such as, Chinese patent literature CN101289624A discloses the method for warm modified pitch in the production of a kind of two sections of series connection continuous pressure hot polymerizations, comprise the steps: that mid-temperature pitch obtains modified pitch by the polycondensation of two sections of cascade reaction still low-pressure heatings, wherein, be heated to 370 ~ 380 DEG C at first paragraph and carry out pre-scission reaction, be heated to 390 ~ 405 DEG C at second segment and carry out heating polycondensation fast, thus increase toluene insolubles content, reduce α resin content, improve β resin content; Reacted material enters flashing tower, regulates the softening temperature of modified pitch in this tower; Flash system tail gas enters smoke absorption system, by chimney is discharged after absorbing with circulating washing oil.
In above-mentioned technology, in pre-cracking and thermal polycondensation reaction process, a part of Toluene Soluble component can be converted into β resin after polyreaction, scission reaction can be there is and be converted into β resin in part α resin, in pitch also can there is polycondensation and be converted into α resin in original a part of β resin, also can produce hydrogen, methane, water and non-condensable gases simultaneously.By the modified pitch that modifying process obtains, its β resin content is increased significantly, namely the fixed carbon content of modified pitch is increased significantly, and the volume density of the carbon materials after roasting, physical strength and conductivity also improve greatly.But, due in above-mentioned upgrading processes, in the thermal polycondensation step of reaction of subordinate phase, in pitch, original a part of β resin also can form new α resin, and in modified pitch, the increase of α resin content can cause that the softening temperature of modified pitch and viscosity increase, mobility is deteriorated, and then modified pitch can be caused can not to be closely combined between electrode aggregate preparing in electrode process, make the electrode materials prepared of poor quality, the life-span is short.
Summary of the invention
Technical problem to be solved by this invention also can generate α resin in the preparation process of modified pitch in prior art, easily like this cause that the softening temperature of modified pitch and viscosity increase, mobility is deteriorated, and then cause can not being closely combined between modified pitch with aggregate, make to prepare electrode materials of poor quality, the life-span is short, and then provides a kind of softening temperature and viscosity is low, the preparation method of good fluidity, modified pitch that fixed carbon content is high.
In order to solve the problems of the technologies described above, the invention provides a kind of preparation method of modified pitch, comprise the steps: coal tar or coal-tar pitch to mix with uncombined carbon or containing the component of uncombined carbon, under 360 ~ 380 DEG C of conditions, obtain modified pitch after reacting by heating.
The content of the described component Free Carbon containing uncombined carbon is 15 ~ 95wt%, and surplus is impurity.
The described component containing uncombined carbon obtains mixed solution after coal tar or coal-tar pitch fully being mixed with solvent, and then employing physical separation method removes the insolubles in described mixed solution, and this insolubles is the component containing uncombined carbon;
Wherein, described solvent is the mixture of coal measures lightweight oil and coal measures aromatic oil, or the mixture of BTX and coal measures aromatic oil, and the mass ratio of described coal measures lightweight oil or BTX and coal measures aromatic oil is 0.25-19; The mass ratio of described solvent and described coal tar or coal-tar pitch is 0.5-10.
Described coal measures lightweight oil is one or more in gas light oil, tar light oil, petroleum naphtha light oil, and described coal measures aromatic oil is washing oil, absorb oil, cresols is oily, one or more in carbolineum.
Described physical separation method is by any one in centrifugation, filtration, precipitation separation.
Described uncombined carbon is at 50 ~ 70 DEG C, and obtain mixed solution by coal tar or coal-tar pitch or after fully mixing with solvent containing the component of uncombined carbon, then remove the insolubles in described mixed solution through centrifugation, this insolubles is uncombined carbon;
Wherein, described solvent is washing oil, absorb in oil, carbolineum or quinoline any one, described solvent and described coal tar or coal-tar pitch or the mass ratio containing free carbon component are 8 ~ 10.
The centrifugal force of described centrifugation is 2000 ~ 3000g.
In the quality of uncombined carbon, described uncombined carbon or the component containing uncombined carbon compare for 3:100 ~ 50:100 with the addition of described coal tar or coal-tar pitch.
In the quality of uncombined carbon, described uncombined carbon or the component containing uncombined carbon compare for 5:100 ~ 30:100 with the addition of described coal tar or coal-tar pitch.
The described reacting by heating time is 5 ~ 8h.
The present invention compared with prior art tool has the following advantages:
The preparation method of modified pitch of the present invention, by adding uncombined carbon or the component containing uncombined carbon in feed coal tar or coal-tar pitch, before heat-treating, the fixed carbon content contained in coal tar or coal-tar pitch just can uprise, therefore in heat treatment process, only need to heat-treat under the lower temperature conditions of 360 ~ 380 DEG C, the modified pitch of high fixed carbon content can be obtained, and when carrying out asphalt modifier at this temperature, upgrading processes medium pitch can not polymerization reaction take place, namely can not generate α resin, be equivalent to the QI value not change of modified pitch, so the modified pitch prepared has viscosity and softening temperature is low, mobility is high, the advantage that fixed carbon element amount is high.And viscosity and softening temperature is low, the high meeting of mobility makes closely to be combined between modified pitch with aggregate, thus make that the quality of the electrode materials prepared is good, the life-span is long; On the other hand, after the fixed carbon content of modified pitch improves, the volume density of its ultra-high power graphite electrode obtained through roasting, physical strength and conductivity also can improve greatly.
Embodiment
Below in conjunction with embodiment, the present invention is further described in detail, but is not limited to this.
embodiment 1
The coal tar of 1000g is mixed with the uncombined carbon of 30g, under 360 DEG C of conditions, obtains modified pitch A after reacting by heating 8h;
Wherein, the preparation method of described uncombined carbon is as follows:
Under 50 DEG C of conditions, coal tar is fully mixed with solvent, obtains mixed solution, under the centrifugal force of 2000g, then carry out centrifugation remove insolubles in described mixed solution, the insolubles obtained is uncombined carbon, and the viscosity of carrying out the described mixed solution of centrifugation is 40mpas;
Described solvent is carbolineum, and the mass ratio of described carbolineum and described coal tar is 10.
embodiment 2
The coal tar of 1000g is mixed with the uncombined carbon of 50g, under 365 DEG C of conditions, obtains modified pitch B after reacting by heating 7h;
Wherein, the preparation method of described uncombined carbon is as follows:
Under 60 DEG C of conditions, fully mixed with solvent by the composition containing uncombined carbon, obtain mixed solution, under the centrifugal force of 2500g, carry out centrifugation, remove the insolubles in described mixed solution, the viscosity of carrying out the described mixed solution of centrifugation is 45mpas;
Described solvent is washing oil; The mass ratio of described washing oil and described pitch is 9;
embodiment 3
The coal tar of 1000g is mixed with the uncombined carbon of 100g, under 370 DEG C of conditions, obtains modified pitch C after reacting by heating 6h;
Wherein, the preparation method of described uncombined carbon is as follows:
Under 70 DEG C of conditions, fully mixed by coal-tar pitch with solvent, obtain mixed solution, under the centrifugal force of 3000g, carry out centrifugation, remove the insolubles in described mixed solution, the viscosity of carrying out the described mixed solution of centrifugation is 40mpas;
Described solvent is quinoline, and the mass ratio of described quinoline and described pitch is 8.
embodiment 4
Mixed with the component containing uncombined carbon of 1000g by the coal tar of 1000g, the content of the wherein said component Free Carbon containing uncombined carbon is 15wt%, under 380 DEG C of conditions, obtain modified pitch D after reacting by heating 5h.
Method for preparing ingredients thereof containing uncombined carbon described in the present embodiment is as follows:
Fully mixed with solvent by coal-tar pitch, obtain mixed solution, under the centrifugal force of 1000g, carry out centrifugation remove insolubles in described mixed solution, the viscosity of carrying out the described mixed solution of centrifugation is 74mpas;
Described solvent is gas light oil and the mixture absorbing oil, and described gas light oil is 12 with the mass ratio of absorption oil; The mass ratio of described solvent and described pitch is 7.
embodiment 5
Mixed with the component containing uncombined carbon of 667g by the coal tar of 1000g, the content of the wherein said component Free Carbon containing uncombined carbon is 30wt%, under 375 DEG C of conditions, obtain modified pitch E after reacting by heating 5.5h.
The preparation method of the component containing uncombined carbon described in the present embodiment is as follows:
Fully mixed with solvent by coal-tar pitch, obtain mixed solution, the method for employing precipitate and separate removes the insolubles in described mixed solution, and the viscosity of carrying out the described mixed solution of precipitate and separate is 82mpas;
Described solvent is BTX and the mixture absorbing oil, and described BTX is 10 with the mass ratio of absorption oil; The mass ratio of described solvent and described pitch is 6.
embodiment 6
Mixed with the component containing uncombined carbon of 500g by the coal tar of 1000g, the content of the wherein said component Free Carbon containing uncombined carbon is 50wt%, under 365 DEG C of conditions, obtain modified pitch F after reacting by heating 6.5h.
The preparation method of the component containing uncombined carbon described in the present embodiment is as follows:
Fully mixed with solvent by coal-tar pitch, obtain mixed solution, the method for employing filtering separation removes the insolubles in described mixed solution, and the viscosity of carrying out the described mixed solution of filtering separation is 87mpas;
Described solvent is gas light oil and the mixture absorbing oil, and described gas light oil is 8 with the mass ratio of absorption oil; The mass ratio of described solvent and described pitch is 4.
embodiment 7
Mixed with the component containing uncombined carbon of 462g by the coal tar of 1000g, the content of the wherein said component Free Carbon containing uncombined carbon is 65wt%, under 365 DEG C of conditions, obtain modified pitch G after reacting by heating 6.5h.
The preparation method of the component containing uncombined carbon described in the present embodiment is as follows:
Fully mixed with solvent by coal-tar pitch, obtain mixed solution, under the centrifugal force of 700g, carry out centrifugation remove insolubles in described mixed solution, the viscosity of carrying out the described mixed solution of centrifugation is 91mpas;
Described solvent is gas light oil and the mixture absorbing oil, and described gas light oil is 6 with the mass ratio of absorption oil; The mass ratio of described solvent and described pitch is 3.
embodiment 8
Mixed with the component containing uncombined carbon of 500g by the coal tar of 1000g, the content of the wherein said component Free Carbon containing uncombined carbon is 80wt%, under 365 DEG C of conditions, obtain modified pitch H after reacting by heating 6.5h.
The preparation method of the component containing uncombined carbon described in the present embodiment is as follows:
Fully mixed with solvent by coal tar, obtain mixed solution, under the centrifugal force of 1200g, carry out centrifugation remove insolubles in described mixed solution, the viscosity of carrying out the described mixed solution of centrifugation is 94mpas;
Described solvent is gas light oil and the mixture absorbing oil, and described gas light oil is 3 with the mass ratio of absorption oil; The mass ratio of described solvent and described pitch is 2.
embodiment 9
Mixed with the component containing uncombined carbon of 526g by the coal tar of 1000g, the content of the wherein said component Free Carbon containing uncombined carbon is 95wt%, under 360 DEG C of conditions, obtain modified pitch I after reacting by heating 9h.
The preparation method of the component containing uncombined carbon described in the present embodiment is as follows:
Fully mixed with solvent by coal tar, obtain mixed solution, under the centrifugal force of 1500g, carry out centrifugation remove insolubles in described mixed solution, the viscosity of carrying out the described mixed solution of centrifugation is 97mpas;
Described solvent is gas light oil and the mixture absorbing oil, and described gas light oil is 0.25 with the mass ratio of absorption oil; The mass ratio of described solvent and described pitch is 0.5
comparative example
See embodiment 1 described in documents CN101289624A, be that the mid-temperature pitch of 340 ~ 360 DEG C is forced into 0.5 ~ 1.0MPa and enters first paragraph hot polymerization reactor by temperature, in reactor, mid-temperature pitch is heated to 375 ~ 385 DEG C, carries out pre-reaction 3 ~ 3.5h; Pitch after pre-reaction enters second segment hot polymerization reactor, at 395 ~ 405 DEG C, react 3h; Reaction after product enters flashing tower, and carry out flash distillation at 380 ~ 390 DEG C, flash oil enters flash oil medial launder, and modified pitch is discharged bottom flashing tower.
performance evaluation test case
Carry out the test of softening temperature, toluene insolubles, quinoline insolubles and β resin content to the modified pitch prepared in embodiment 1 ~ 9 and comparative example, test result is in table 1.
Modified pitch the performance test results in table 1 embodiment 1 ~ 9 and comparative example
From the above results, the modified pitch adopting the preparation method of modified pitch of the present invention to prepare its there is softening point temperature can be low to moderate 82.43 DEG C, toluene insolubles content is up to 35.42wt%, and quinoline insolubles content is low to moderate 6.49wt%, when not polymerization reaction take place, its β resin content can up to 28.82%, and coking value also can reach 70.04wt%.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments, and thus the apparent change of extending out or variation be still among the protection domain of the invention claim.
Claims (10)
1. a preparation method for modified pitch, comprises the steps: coal tar or coal-tar pitch to mix with uncombined carbon or containing the component of uncombined carbon, under 360 ~ 380 DEG C of conditions, obtains modified pitch after reacting by heating;
The described component containing uncombined carbon obtains mixed solution after coal tar or coal-tar pitch fully being mixed with solvent, and then employing physical separation method removes the insolubles in described mixed solution, and this insolubles is the component containing uncombined carbon; Wherein, the described solvent for the preparation of the described component containing uncombined carbon is the mixture of coal measures lightweight oil and coal measures aromatic oil, or the mixture of BTX and coal measures aromatic oil;
Described uncombined carbon is at 50 ~ 70 DEG C, and obtain mixed solution by coal tar or coal-tar pitch or after fully mixing with solvent containing the component of uncombined carbon, then remove the insolubles in described mixed solution through centrifugation, this insolubles is uncombined carbon; Wherein, for the preparation of the described solvent of described uncombined carbon be washing oil, absorb in oil, carbolineum or quinoline any one.
2. the preparation method of modified pitch according to claim 1, is characterized in that, the content of the described component Free Carbon containing uncombined carbon is 15 ~ 95wt%, and surplus is impurity.
3. the preparation method of modified pitch according to claim 1, it is characterized in that, the mass ratio of described coal measures lightweight oil or BTX and coal measures aromatic oil is 0.25-19; Be 0.5-10 for the preparation of the described described solvent of component containing uncombined carbon and the mass ratio of described coal tar or coal-tar pitch.
4. the preparation method of modified pitch according to any one of claim 1-3, it is characterized in that, described coal measures lightweight oil is one or more in gas light oil, tar light oil, petroleum naphtha light oil, and described coal measures aromatic oil is washing oil, absorb oil, cresols is oily, one or more in carbolineum.
5. the preparation method of modified pitch according to any one of claim 1-3, it is characterized in that, described physical separation method is by any one in centrifugation, filtration, precipitation separation.
6. the preparation method of modified pitch according to claim 1, is characterized in that, is 8 ~ 10 for the preparation of the described solvent of described uncombined carbon and described coal tar or coal-tar pitch or the mass ratio containing the component of uncombined carbon.
7. the preparation method of modified pitch according to claim 1 or 6, it is characterized in that, the centrifugal force of described centrifugation is 2000 ~ 3000g.
8. the preparation method of modified pitch according to any one of claim 1-3, is characterized in that, in the quality of uncombined carbon, described uncombined carbon or containing component and the described coal tar of uncombined carbon or the addition of coal-tar pitch than being 3:100 ~ 50:100.
9. the preparation method of modified pitch according to claim 8, is characterized in that, in the quality of uncombined carbon, described uncombined carbon or containing component and the described coal tar of uncombined carbon or the addition of coal-tar pitch than being 5:100 ~ 30:100.
10. the preparation method of modified pitch according to any one of claim 1-3, it is characterized in that, the described reacting by heating time is 5 ~ 8h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310036508.2A CN103965931B (en) | 2013-01-31 | 2013-01-31 | A kind of preparation method of modified pitch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310036508.2A CN103965931B (en) | 2013-01-31 | 2013-01-31 | A kind of preparation method of modified pitch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103965931A CN103965931A (en) | 2014-08-06 |
| CN103965931B true CN103965931B (en) | 2016-01-20 |
Family
ID=51235945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310036508.2A Active CN103965931B (en) | 2013-01-31 | 2013-01-31 | A kind of preparation method of modified pitch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103965931B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108315036A (en) * | 2018-02-28 | 2018-07-24 | 黄骅市信诺立兴精细化工股份有限公司 | The production technology of coalite tar heavy constituent production modified coal tar pitch in a kind of utilization |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101289624A (en) * | 2008-06-03 | 2008-10-22 | 山西宏特煤化工有限公司 | Process for producing moderate temperature modified bitumen by continuously pressurizing and hot-polymerizing at two stages connected in series |
| CN101775308A (en) * | 2010-02-21 | 2010-07-14 | 河南海星化工科技有限公司 | Method for producing modified asphalt |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6051783A (en) * | 1983-08-31 | 1985-03-23 | Osaka Gas Co Ltd | Production of binder |
-
2013
- 2013-01-31 CN CN201310036508.2A patent/CN103965931B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101289624A (en) * | 2008-06-03 | 2008-10-22 | 山西宏特煤化工有限公司 | Process for producing moderate temperature modified bitumen by continuously pressurizing and hot-polymerizing at two stages connected in series |
| CN101775308A (en) * | 2010-02-21 | 2010-07-14 | 河南海星化工科技有限公司 | Method for producing modified asphalt |
Non-Patent Citations (1)
| Title |
|---|
| 改质沥青生产工艺的比较与应用;甄凡瑜;《煤化工》;20100228(第1期);第52-55页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103965931A (en) | 2014-08-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105778968A (en) | Method for preparing impregnating pitch, impregnating pitch and application thereof | |
| CN103359702A (en) | Preparation method of mesophase carbon microspheres with different particle sizes | |
| CN103740395B (en) | Modified asphalt and preparation method thereof | |
| CN104194813A (en) | Method for preparing coke | |
| CN109970038A (en) | The method for producing mesocarbon microspheres as raw material using middle coalite tar | |
| CN106904612A (en) | The method that activated carbon is prepared with de-oiled asphalt | |
| CN104194816A (en) | Method for preparing coke | |
| CN109370642A (en) | A kind of delay coking process being used to prepare coal-based needle coke | |
| CN104946288A (en) | Modified pitch and preparation method thereof | |
| CN103755926B (en) | Condensation multinuclear polyaromatic hydrocarbon resin and preparation method thereof | |
| CN103756706B (en) | Modified asphalt and preparation method thereof | |
| Kim et al. | The effect of carbon black on reforming of pyrolysis fuel oil for a binder pitch | |
| CN103965931B (en) | A kind of preparation method of modified pitch | |
| CN110357069A (en) | With emulsification-plus hydrogen-hot polymerization ternary Fourier Series expansion technique preparation mesocarbon microspheres method | |
| CN106883871B (en) | A kind of production method of needle-shape coke raw material | |
| CN105001893B (en) | The method that kerosene co grinding method residue prepares mesophase pitch | |
| CN109097084A (en) | A kind of coal blending feedstock composition producing formed coke and formed coke preparation process | |
| CN104479707B (en) | A kind of method for preparing needle coke | |
| CN113088313B (en) | Preparation method of mesophase pitch | |
| CN105861014A (en) | Method for preparing impregnation pitch using direct coal liquefaction residue, impregnation pitch and application thereof | |
| CN113088327B (en) | Method for producing mesophase pitch | |
| CN113755211B (en) | Method for producing needle coke by using raw material containing optimized ethylene tar | |
| CN102041013A (en) | Method for producing needle coke raw material by using delayed coking process | |
| CN110982549B (en) | Low-temperature preparation method of modified asphalt | |
| CN111423592A (en) | Preparation method of low-viscosity high-carbon-residue-rate binder asphalt for carbon materials |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100029 Beijing City, Chaoyang District Hui New Street No. 11 Ziguang building A block 12 layer Patentee after: BEIJING BAOJU ENERGY SCIENCE AND TECHNOLOGY CO.,LTD. Address before: 100029 Beijing City, Chaoyang District Hui New Street No. 11 Ziguang building A block 12 layer Patentee before: BEIJING BAOTASANJU ENERGY TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201020 Address after: 100080, Beijing, Haidian District North Road, No. 33, building 1, foundation building, 9 floor Patentee after: BEIJING SANJU ENVIRONMENTAL PROTECTION & NEW MATERIALS Co.,Ltd. Address before: 100029, Beijing, Chaoyang District Xin Tung Street, No. 11 violet development building, block A, 12 Patentee before: BEIJING BAOJU ENERGY SCIENCE AND TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100080 9th floor, Dahang Jiye building, No.1 building, 33 Renmin North Road, Haidian District, Beijing Patentee after: Beijing Haixin Energy Technology Co.,Ltd. Address before: 100080 9th floor, Dahang Jiye building, No.1 building, 33 Renmin North Road, Haidian District, Beijing Patentee before: BEIJING SANJU ENVIRONMENTAL PROTECTION & NEW MATERIALS Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |