CN203540496U - Butane and air mixing distributor - Google Patents
Butane and air mixing distributor Download PDFInfo
- Publication number
- CN203540496U CN203540496U CN201320676277.7U CN201320676277U CN203540496U CN 203540496 U CN203540496 U CN 203540496U CN 201320676277 U CN201320676277 U CN 201320676277U CN 203540496 U CN203540496 U CN 203540496U
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- CN
- China
- Prior art keywords
- pipe
- distributor
- air
- distributor pipe
- butane
- 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 - Lifetime
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- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000001273 butane Substances 0.000 title claims abstract description 37
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000009826 distribution Methods 0.000 claims abstract description 40
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000003780 insertion Methods 0.000 claims abstract description 4
- 230000037431 insertion Effects 0.000 claims abstract description 4
- 239000011148 porous material Substances 0.000 claims description 17
- 239000003054 catalyst Substances 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000002360 explosive Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 38
- 239000007789 gas Substances 0.000 description 28
- 230000000694 effects Effects 0.000 description 8
- 238000003466 welding Methods 0.000 description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 230000004927 fusion Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005493 welding type Methods 0.000 description 4
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 3
- 238000004587 chromatography analysis Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000011541 reaction mixture Substances 0.000 description 3
- 230000002459 sustained effect Effects 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 1
- 208000012839 conversion disease Diseases 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses a butane and air mixing distributor which consists of a confluence pipe, a distribution pipe and a mixing barrel body, wherein the distribution pipe is perpendicularly connected with the confluence pipe and is inserted into the mixing barrel body; the insertion direction of the distribution pipe is perpendicular to the axis of the pipe diameter of the mixing barrel body; a pipe bracket is welded at a position, which corresponds to the distribution pipe, in the mixing barrel body; a plugging plate is arranged at the bottom of the distribution pipe and is inserted into the pipe bracket; a plurality of raw material gas holes are formed in the distribution pipe. According to the novel pipeline type butane and air mixing distributor, butane and air are uniformly mixed; the pressure drop is controlled within an allowable range of about 0.01MPa; the mounting position of the butane and air mixing distributor is close to an inlet of a reactor as much as possible, so that the volume of explosive gas is reduced, and the mixing uniformity of raw material gas is improved; the raw material gas entering the reactor is in contact with a catalyst bed layer in a flat flow pushing manner; gas-solid reaction is uniformly executed; the service life of a catalyst is prolonged favorably, and the production safety is improved favorably.
Description
Technical field
The utility model relates to field of chemical technology, and particularly butane oxidation legal system is got raw material butane and air mixture apparatus and the method for maleic anhydride (abbreviation cis-butenedioic anhydride), and then can be applicable to the mixing of industrial other two kinds of gases.
Background technology
Cis-butenedioic anhydride is important Organic Chemicals and fine chemical product, is also the third-largest acid anhydrides that is only second in the world phthalic anhydride and aceticanhydride, and its purposes is extremely extensive.Use normal butane and air to produce cis-butenedioic anhydride for raw material, in calandria type fixed bed reactor, at catalyst action, issue raw gas phase oxidation, it is strong exothermic reaction, various catalyst all require will make normal butane mix with air in process feeds operation, avoid mixing inhomogeneous because of unstripped gas, cause part " temperature runaway " and catalyst is caused damage, affecting reaction conversion ratio, Selectivity of maleic anhydride, yield, catalyst service life and safety in production.
According to traditional experience, gas mix mostly in a container, pass into simultaneously two kinds of gases or wherein a kind of gas in shower nozzle mode, spray into, then by the diffusion motion between gas, carry out free mixing, this hybrid mode exists mixing not fully, evenly, the deficiency that mixing velocity is slow; Some device, for strengthening mixes, increased a static mixer before entering reactor, utilized the structure internals that arrange wherein to play the perturbation action to gas, strengthened mixing.Due to being set, mixer and static mixer not only increase investment, the drag enable consumption that also increases pipe-line system increases, in simultaneous reactions device admission line, the mist of normal butane and air is damp, after mixing, pipeline is longer, explosive gas mixture volume strengthens, and does not accomplish essential safe type.
Summary of the invention
The technology problem that the utility model need to solve, it is mainly open a kind of duct type butane air mixed distribution device, be installed on reactor admission line, omit mixer and static mixer, make butane and air rapid mixing even, and it is as far as possible little to make raw material pass through butane air mixed distribution device resistance drop, reduce and enter the air of butane air mixed distribution device and the pressure of butane, thereby reduce upstream gas supply unit energy consumption, can try one's best near reactor inlet in installation site, reduce fiery gas body bulk, improve the security of producing.
The technical solution of the utility model is as follows:
Butane air mixed distribution device, is comprised of collecting pipe 5, distributor pipe 6 and mix cylinder 9; Distributor pipe 6 and collecting pipe 5 be vertical to be connected, distributor pipe 6 inserts in mix cylinder, and distributor pipe 6 direction of insertion are vertical with mix cylinder caliber axis; In mix cylinder, with distributor pipe 6 corresponding position welded pipe rests 8, distributor pipe bottom is provided with closure plate, in Inserting Tube rest 8, is provided with many steam vents 7 on distributor pipe.
Described mix cylinder is identical with reactor admission line caliber.
Described mix cylinder two ends are provided with flange 10, by flange, are connected with air inlet pipe.
When the described raw material butagas from pore ejection is forward distributed in air draught, 2～3 of perforates on half circumference of every of the air-flow direction every row of distributor pipe dorsad, the perforate of adjacent distributions pipe is arranged and is crisscross arranged.
The described raw material butagas contrary distribution from pore ejection is in air draught time, and towards 2～3 of perforates on half circumference of the every row of every distributor pipe of air-flow direction, the perforate of adjacent distributions pipe is arranged and is crisscross arranged.
Described distributor pipe caliber DN15～25,3～4 times of distributor pipe nominal diameters of arrangement pitch clear distance, the air vent aperture Φ 2.5～4.5mm on distributor pipe, two arrange 20～30 times of air vent apertures of spacing between two vertical holes.
Described distributor pipe bottom closure plate Inserting Tube rest is greater than 1/4 height, and distributor pipe Inserting Tube rest is crossed to win and coordinated.
By gas mixed effect after butane air mixer, can record by measurement of concetration sampler 2 in Fig. 1, on mixed pipeline, differing heights place establishes sample point, through chromatography, the standard deviation of mixed distribution device downstream butane concentration is less than or equal to 0.01 divided by mean value, good mixing effect.
By adopting Novel pipe type butane air mixed distribution device, butane is mixed with air, Pressure Drop is controlled at about 0.01MPa in allowed band, can try one's best near reactor inlet in its installation site, reduce fiery gas body bulk, improve the mixture homogeneity of unstripped gas, the unstrpped gas that enters reactor is contacted with beds with plug flow mode, gas-solid reaction evenly carries out, and is conducive to extending catalyst service life and improves production security.
Accompanying drawing explanation
Fig. 1: butane and air mixture length figure;
Fig. 2: butane air mixed distribution device cutaway view;
Fig. 3 a: distributor pipe arranges 2 pore schematic diagrames;
Fig. 3 b: distributor pipe arranges 3 pore schematic diagrames;
Fig. 4: in Fig. 1, the pipe rest of E detail drawing connects detail drawing;
1-butane air mixed distribution device, 2-measurement of concetration sampler, 3-reactor, 4-pump for liquid salts, 5-collecting pipe, 6-distributor pipe, 7-pore, 8-pipe rest, 9-mix cylinder, 10-flange 11-closure plate A-normal butane, B-raw air, the air inlet of C-mixing post-reactor.
The specific embodiment
By reference to the accompanying drawings, duct type butane mixed distribution device is described further.
As shown in Figure 1 to 4, the utility model is comprised of collecting pipe 5, distributor pipe 6 and mix cylinder 9; Distributor pipe 6 and collecting pipe 5 be vertical to be connected, distributor pipe 6 inserts in mix cylinder, and distributor pipe 6 direction of insertion are vertical with mix cylinder caliber axis; In mix cylinder, with distributor pipe 6 corresponding position welded pipe rests 8, distributor pipe bottom is provided with closure plate, in Inserting Tube rest 8, is provided with many steam vents 7 on distributor pipe.Flow into the raw material butane gas A with certain pressure of collecting pipe by pore ejection on distributor pipe, on distributor pipe, pore is analogous to nozzle effect, the pressure decreased when butane gas with certain pressure potential energy is flow through to aperture, volumetric expansion, specific volume increases, and the corresponding increase of its flow velocity, these high-speed jets are entrainmented the raw air B around mix cylinder distributor pipe aperture forming vacuum near aperture, through eddy current form, be uniformly mixed into reaction mixture gas C completely, the mix cylinder that continues to flow through converts swiftly flowing kinetic energy to pressure potential, make more than static pressure returns to atmospheric pressure, flow to Reactor inlet, reach reactor catalyst charging requirement.
This duct type butane air mixed distribution device is identical with reactor admission line caliber, and flange 10 is equipped with at two ends, by flange, is connected with admission line, facilitates installing/dismounting and repair and maintenance.The collecting pipe of butane air mixed distribution device and mix cylinder be 90 degree vertical currents to, by the perforate on distributor pipe in mix cylinder, can by butagas forward or contrary distribution in air draught, be beneficial to the mixing of two kinds of fluids, improve mixing efficiency.2～3 of the perforates forward or on the semicircle that flows to of reverse raw air of every every row's sustained height of distributor pipe, the perforate of adjacent distributions pipe is arranged and is crisscross arranged.
The perforate of adjacent distributions pipe interlaced arrangement in the vertical direction, is beneficial to the even mixing of two kinds of gases in whole space.1/4 height of distributor pipe bottom weldering one closure plate Inserting Tube rest, pipe rest bore size is more bigger than distributor pipe external diameter, make distributor pipe Inserting Tube rest become interference fit, can make butagas spray and play cushioning effect at a high speed from distributor pipe aperture, pipe rest and mix cylinder are welded and fixed and can effectively prevent that butagas is from the distributor pipe vibration that at a high speed ejection causes of distributor pipe aperture, and then cause that distributor pipe inserts mix cylinder interface weld seam and tears and cause butane gas to occur to the accident of large gas leakage.
According to mix cylinder size difference, each design of major parts scope is as follows:
Collecting pipe caliber: DN80～125;
Mix cylinder caliber: DN600～900
Distributor pipe caliber: DN15～25,3～4 times of distributor pipe nominal diameters of arrangement pitch clear distance;
Perforate aperture on distributor pipe: Φ 2.5～4.5mm, two arrange 20～30 times of air vent apertures of spacing between two vertical holes.
Embodiment 1
Butane air mixer take 20,000 tons/year of single reactor productivity proposes as basis.DN100 collecting pipe 5 connects 9 DN20 distributor pipes 6 and inserts DN900 mix cylinder 9, distributor pipe adopts complete penetraction and fusion in welding Type of Welding to be welded and fixed through mixing entire body place, article 9, clear distance 65mmm between distributor pipe, 8 approximately 15 millimeters of distributor pipe 6 bottom Inserting Tube rests, and at pipe rest upper surface and distributor pipe spot welding 4 places, be uniformly distributed, pipe rest 8 adopts complete penetraction and fusion in welding Type of Welding to be welded and fixed with mix cylinder 9, and 9 distributor pipes 6 have
pore 7 totally 156 as Fig. 3 a, on half circumference sustained height of every of air-flow direction distributor pipe, have two pores 7 that become 45 degree with tube section center line dorsad, butagas is forward distributed in air draught, on adjacent distributions pipe, pore is interspersed on upright position, vertical spacing 75mm between two holes.Raw air B enters mix cylinder 9 along direction as shown, normal butane A through gasifying after overheated flows into collecting pipe 5 with about 0.35MPa pressure, by the pore ejection on distributor pipe, forward be distributed in air, butagas and air are mixed into reaction mixture gas C completely equably through eddy current form, reach the requirement that reactor catalyst charging mixes.The each parts of integral device all adopt carbon steel, and mix cylinder 9 two ends are welded with flange, by flange, are connected with admission line, facilitate installing/dismounting and repair and maintenance.
Adopt the said equipment and method, under pressure drop restriction (being less than or equal to 0.01MPa) condition of regulation, realize maximizing and mix, reach the requirement that reactor catalyst charging mixes, static mixer can be no longer set, make raw material pass through mixed distribution device resistance drop as far as possible little, reduce and enter the raw air of mixed distribution device and the pressure of butane, thereby reduction energy consumption, and can be tried one's best and install near reactor inlet, reduce fiery gas body bulk, improve the security of producing.Mixed distribution device mixed effect can record by Fig. 1 measurement of concetration sampler, and at mix cylinder differing heights, place establishes sample point, and through chromatography, the standard deviation of mixed distribution device downstream butane concentration is less than or equal to 0.01 divided by mean value, good mixing effect.
Embodiment 2
Butane air mixer take 2.25 ten thousand tons/year of single reactor productivity proposes as basis.DN100 collecting pipe 5 connects 9 DN20 distributor pipes 6 and inserts DN900 mix cylinder 9, distributor pipe adopts complete penetraction and fusion in welding Type of Welding to be welded and fixed through mixing entire body place, article 9, clear distance 65mmm between distributor pipe, 8 approximately 15 millimeters of distributor pipe 6 bottom Inserting Tube rests, and at pipe rest upper surface and distributor pipe spot welding 4 places, be uniformly distributed, pipe rest 8 adopts complete penetraction and fusion in welding Type of Welding to be welded and fixed with mix cylinder 9, and 9 distributor pipes 6 have
totally 215, pore 7, towards having on half circumference sustained height of every distributor pipe of air-flow direction, become 3 pores 7 of 60 degree, 0 degree as Fig. 3 b with tube section center line, by butagas contrary distribution in air draught, on adjacent distributions pipe, pore is interspersed on upright position, vertical spacing 75mm between two holes.Raw air B enters mix cylinder 9 along direction as shown, normal butane A through gasifying after overheated flows into collecting pipe 5 with about 0.37MPa pressure, by the pore ejection on distributor pipe, contrary distribution is in air, butagas and air are mixed into reaction mixture gas C completely equably through eddy current form, reach the requirement that reactor catalyst charging mixes.The each parts of integral device all adopt carbon steel, and mix cylinder 9 two ends are welded with flange, by flange, are connected with admission line, facilitate installing/dismounting and repair and maintenance.
Adopt the said equipment and method, under pressure drop restriction (being less than or equal to 0.01MPa) condition of regulation, realize maximizing and mix, reach the requirement that reactor catalyst charging mixes, static mixer can be no longer set, make raw material pass through mixed distribution device resistance drop as far as possible little, reduce and enter the raw air of mixed distribution device and the pressure of butane, thereby reduction energy consumption, and can be tried one's best and install near reactor inlet, reduce fiery gas body bulk, improve the security of producing.Mixed distribution device mixed effect can record by Fig. 1 measurement of concetration sampler, and at mix cylinder differing heights, place establishes sample point, and through chromatography, the standard deviation of mixed distribution device downstream butane concentration is less than or equal to 0.01 divided by mean value, good mixing effect.
The utility model is that the basis that is 1.0～2.5 ten thousand tons/year according to current cis-butenedioic anhydride reactor list cover production capacity proposes.By this scale, calculate the consumption of raw air and butane gas, select rational gas flow rate, determine the caliber of mix cylinder and collecting pipe; The quantity of distributor pipe is to be convenient to the welding processing of equipment component according to the raw air clear distance little and that distributor pipe is arranged of trying one's best of the Pressure Drop after distributor pipe pipe row in mix cylinder of flowing through; Distributor pipe the number of openings and aperture meet the flow through flow velocity requirement of aperture of butane gas, and multi-angle is mixed with air.
Claims (7)
1. butane and an air mixed distribution device, it is comprised of collecting pipe (5), distributor pipe (6) and mix cylinder (9); Distributor pipe (6) and collecting pipe (5) be vertical to be connected, distributor pipe (6) inserts in mix cylinder, and distributor pipe (6) direction of insertion is vertical with mix cylinder caliber axis; In mix cylinder, with distributor pipe (6) corresponding position welded pipe rest (8), distributor pipe bottom is provided with closure plate, in Inserting Tube rest (8), is provided with many steam vents (7) on distributor pipe.
2. distributor as claimed in claim 1, is characterized in that described mix cylinder is identical with reactor admission line caliber.
3. distributor as claimed in claim 1, is characterized in that described mix cylinder two ends are provided with flange (10), by flange and air inlet pipe.
4. distributor as claimed in claim 1, when the raw material butagas that it is characterized in that the ejection of described pore is forward distributed in air draught, 2～3 of perforates on half circumference of every of the air-flow direction every row of distributor pipe dorsad, the perforate of adjacent distributions pipe is arranged and is crisscross arranged.
5. distributor as claimed in claim 1, the raw material butagas contrary distribution that it is characterized in that the ejection of described pore is in air draught time, towards 2～3 of perforates on half circumference of the every row of every distributor pipe of air-flow direction, the perforate of adjacent distributions pipe is arranged and is crisscross arranged.
6. distributor as claimed in claim 1, is characterized in that described distributor pipe bottom closure plate Inserting Tube rest is greater than 1/4 height, distributor pipe Inserting Tube rest interference fit.
7. distributor as claimed in claim 1, described distributor pipe caliber DN15～25,3～4 times of distributor pipe nominal diameters of arrangement pitch clear distance, the air vent aperture Φ 2.5～4.5mm on distributor pipe, two arrange 20～30 times of air vent apertures of spacing between two vertical holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676277.7U CN203540496U (en) | 2013-10-30 | 2013-10-30 | Butane and air mixing distributor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320676277.7U CN203540496U (en) | 2013-10-30 | 2013-10-30 | Butane and air mixing distributor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203540496U true CN203540496U (en) | 2014-04-16 |
Family
ID=50458666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320676277.7U Expired - Lifetime CN203540496U (en) | 2013-10-30 | 2013-10-30 | Butane and air mixing distributor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203540496U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521137A (en) * | 2013-10-30 | 2014-01-22 | 天津市化工设计院 | Butane air mixing distributor |
| CN106139945A (en) * | 2016-06-27 | 2016-11-23 | 重庆赛宝工业技术研究院 | There is the flue gas mixing arrangement of low choked flow |
| CN108786683A (en) * | 2018-08-21 | 2018-11-13 | 宁波浙铁江宁化工有限公司 | The examination reaction unit of cis-butenedioic anhydride |
-
2013
- 2013-10-30 CN CN201320676277.7U patent/CN203540496U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521137A (en) * | 2013-10-30 | 2014-01-22 | 天津市化工设计院 | Butane air mixing distributor |
| CN103521137B (en) * | 2013-10-30 | 2015-12-09 | 天津市化工设计院 | Butane air gas mixed distribution device |
| CN106139945A (en) * | 2016-06-27 | 2016-11-23 | 重庆赛宝工业技术研究院 | There is the flue gas mixing arrangement of low choked flow |
| CN108786683A (en) * | 2018-08-21 | 2018-11-13 | 宁波浙铁江宁化工有限公司 | The examination reaction unit of cis-butenedioic anhydride |
| CN108786683B (en) * | 2018-08-21 | 2023-10-03 | 宁波浙铁江宁化工有限公司 | Maleic anhydride test reaction device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170106 Address after: 300457 Tianjin City Development Zone, No. 14 Garden Villa Patentee after: TIANJIN BOHAI CHEMICAL INDUSTRY Group PLANNING AND DESIGN INSTITUTE Address before: 300193 Tianjin City, Nankai District Yangtze River Road, Gushan Road No. 2 Patentee before: CHINA TIANJIN CHEMICAL ENGINEERING DESIGN INSTITUTE |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 300110 No. 2, Gushan Road, Changjiang Road, Tianjin, Nankai District Patentee after: TIANJIN BOHUA ENGINEERING CO.,LTD. Address before: 300457 Tianjin City Development Zone, No. 14 Garden Villa Patentee before: TIANJIN BOHAI CHEMICAL INDUSTRY Group PLANNING AND DESIGN INSTITUTE |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140416 |