CN104445646B - A kind of Anticrustator for descaling boiler and preparation method thereof - Google Patents
A kind of Anticrustator for descaling boiler and preparation method thereof Download PDFInfo
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- CN104445646B CN104445646B CN201410683670.8A CN201410683670A CN104445646B CN 104445646 B CN104445646 B CN 104445646B CN 201410683670 A CN201410683670 A CN 201410683670A CN 104445646 B CN104445646 B CN 104445646B
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- anticrustator
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- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 33
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 32
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 24
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 17
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000008367 deionised water Substances 0.000 claims abstract description 17
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 17
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims abstract description 17
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims abstract description 17
- 229940048086 sodium pyrophosphate Drugs 0.000 claims abstract description 17
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 16
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 16
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011780 sodium chloride Substances 0.000 claims abstract description 12
- 239000012459 cleaning agent Substances 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 24
- 239000004925 Acrylic resin Substances 0.000 claims description 14
- 229920000178 Acrylic resin Polymers 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000003999 initiator Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 229940114077 acrylic acid Drugs 0.000 claims description 7
- 238000001556 precipitation Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 description 8
- 231100000252 nontoxic Toxicity 0.000 description 8
- 230000003000 nontoxic effect Effects 0.000 description 8
- 230000000857 drug effect Effects 0.000 description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
- 230000005764 inhibitory process Effects 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 229910052708 sodium Inorganic materials 0.000 description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- PRORZGWHZXZQMV-UHFFFAOYSA-N azane;nitric acid Chemical compound N.O[N+]([O-])=O PRORZGWHZXZQMV-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
- C02F5/125—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen combined with inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/22—Eliminating or preventing deposits, scale removal, scale prevention
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Detergent Compositions (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a kind of Anticrustator for descaling boiler and preparation method thereof, make by following raw material weight number proportioning: citric acid 25 60 parts, hydrochloric acid 15 35 parts, 12 40 parts of sodium chloride, sodium hexameta phosphate 12 35 parts, sodium pyrophosphate 8 25 parts, 13 25 parts of acrylic acid, ammonium nitrate 8 22 parts, sulfamic acid 8 19 parts, deionized water 35 60 parts.Scale cleaning agent of the present invention can be used for different types of boiler, and antiscaling effect reaches more than 95%, significantly reduces boiler energy consumption.
Description
Technical field
The present invention relates to scale remover field, particularly relate to a kind of Anticrustator for descaling boiler and preparation method thereof.
Background technology
In industrial processes, boiler often produces incrustation scale, by increasing energy consumption after incrustation scale generation, thus increases and produces into
This.Scale preventative of the prior art exists following not enough: first, usage amount is bigger；Secondly, antiscaling effect is relatively low；Furthermore, to pot
Itself there is corrosiveness in stove.Therefore, a kind of antiscaling effect of exploitation is good, nontoxic without erosion, safe and reliable, ground easy and simple to handle scale preventative
Particularly significant.
Summary of the invention
Solve the technical problem that:
In order to provide nothing good, the nontoxic erosion of a kind of drug effect length deenergized period, antiscaling effect, safe and reliable, easy and simple to handle preventing
Dirt agent, the invention provides a kind of Anticrustator for descaling boiler and preparation method thereof.
Technical scheme:
A kind of Anticrustator for descaling boiler, is made by following raw material weight number proportioning: citric acid 25-60 part, hydrochloric acid 15-35
Part, sodium chloride 12-40 part, sodium hexameta phosphate 12-35 part, sodium pyrophosphate 8-25 part, acrylic acid 13-25 part, ammonium nitrate 8-22 part,
Sulfamic acid 8-19 part, initiator 3-14 part, acrylic resin cementing agent 4-16 part, deionized water 35-60 part.
As a preferred embodiment of the present invention, make by following raw material weight number proportioning: citric acid 30-55 part, salt
Acid 20-30 part, sodium chloride 15-35 part, sodium hexameta phosphate 15-30 part, sodium pyrophosphate 10-22 part, acrylic acid 15-24 part, nitric acid
Ammonium 9-20 part, sulfamic acid 9-17 part, initiator 5-12 part, acrylic resin cementing agent 5-14, deionized water 40-55 part.
The preparation method of a kind of Anticrustator for descaling boiler, comprises the following steps:
(1) adding citric acid, hydrochloric acid, sodium chloride and deionized water in a kettle., reactor temperature is 35-56 DEG C,
Stirring mixing 1.2-2.3 hour；
(2) in the solution of step (1), sodium hexameta phosphate, sodium pyrophosphate, acrylic acid, ammonium nitrate and sulfamic acid are added,
In reactor, temperature rises to 63-78 DEG C, continues reaction 1.1-2.8 hour；
(3) in step (2) resulting solution, add initiator and acrylic resin cementing agent, separate out precipitation；
(4) centrifugal treating, acquisition solid, dry under the conditions of 102-123 DEG C and can obtain scale cleaning agent.
As a preferred technical solution of the present invention, step (1) adds citric acid, hydrochloric acid, sodium chloride in a kettle.
And deionized water, reactor temperature is 48 DEG C, stirring mixing 1.8 hours.
As a preferred technical solution of the present invention, step (2) adds in the solution of step (1) hexa metaphosphoric acid
Sodium, sodium pyrophosphate, acrylic acid, ammonium nitrate and sulfamic acid, in reactor, temperature rises to 74 DEG C, continues reaction 2.3 hours.
As a preferred technical solution of the present invention, step (4) processes by centrifugation, obtains solid, under the conditions of 116 DEG C
Drying can obtain scale cleaning agent.
Beneficial effect
A kind of Anticrustator for descaling boiler of the present invention and preparation method thereof uses above technical scheme to have techniques below
Effect: the first, scale inhibition efficiency is high；The second, drug effect is long for deenergized period；3rd, nontoxic without erosion, safe and reliable, easy and simple to handle.
Detailed description of the invention
Embodiment 1:
A kind of Anticrustator for descaling boiler, is made by following raw material weight number proportioning: citric acid 25 parts, hydrochloric acid 15 parts, chlorine
Change 12 parts of sodium, sodium hexameta phosphate 12 parts, sodium pyrophosphate 8 parts, 13 parts of acrylic acid, ammonium nitrate 8 parts, sulfamic acid 8 parts, initiator 3
Part, acrylic resin cementing agent 4 parts, deionized water 35 parts.
The preparation method of a kind of Anticrustator for descaling boiler, comprises the following steps:
(1) adding citric acid, hydrochloric acid, sodium chloride and deionized water in a kettle., reactor temperature is 35 DEG C, stirring
Mix 1.2 hours；
(2) in the solution of step (1), sodium hexameta phosphate, sodium pyrophosphate, acrylic acid, ammonium nitrate and sulfamic acid are added,
In reactor, temperature rises to 63 DEG C, continues reaction 1.1 hours；
(3) in step (2) resulting solution, add initiator and acrylic resin cementing agent, separate out precipitation；
(4) centrifugal treating, acquisition solid, dry under the conditions of 102 DEG C and can obtain scale cleaning agent.
The solid scale preventing and removing agent scale inhibition performance that the program prepares is 97.3%, and drug effect reaches 1a deenergized period；Nontoxic without erosion, peace
The most reliable, easy and simple to handle.
Embodiment 2:
A kind of Anticrustator for descaling boiler, is made by following raw material weight number proportioning: citric acid 30 parts, hydrochloric acid 20 parts, chlorine
Change 15 parts of sodium, sodium hexameta phosphate 15 parts, sodium pyrophosphate 10 parts, 16 parts of acrylic acid, ammonium nitrate 11 parts, sulfamic acid 11 parts, cause
Agent 5 parts, acrylic resin cementing agent 6 parts, deionized water 40 parts.
The preparation method of a kind of Anticrustator for descaling boiler, comprises the following steps:
(1) adding citric acid, hydrochloric acid, sodium chloride and deionized water in a kettle., reactor temperature is 40 DEG C, stirring
Mix 1.5 hours；
(2) in the solution of step (1), sodium hexameta phosphate, sodium pyrophosphate, acrylic acid, ammonium nitrate and sulfamic acid are added,
In reactor, temperature rises to 66 DEG C, continues reaction 1.6 hours；
(3) in step (2) resulting solution, add initiator and acrylic resin cementing agent, separate out precipitation；
(4) centrifugal treating, acquisition solid, dry under the conditions of 106 DEG C and can obtain scale cleaning agent.
The solid scale preventing and removing agent scale inhibition performance that the program prepares is 98.1%, and drug effect reaches 1.2a deenergized period；Nontoxic nothing erosion,
Safe and reliable, easy and simple to handle.
Embodiment 3:
A kind of Anticrustator for descaling boiler, is made by following raw material weight number proportioning: citric acid 35 parts, hydrochloric acid 25 parts, chlorine
Change 20 parts of sodium, sodium hexameta phosphate 20 parts, sodium pyrophosphate 12 parts, 19 parts of acrylic acid, ammonium nitrate 14 parts, sulfamic acid 13 parts, cause
Agent 7 parts, acrylic resin cementing agent 9 parts, deionized water 45 parts.
The preparation method of a kind of Anticrustator for descaling boiler, comprises the following steps:
(1) adding citric acid, hydrochloric acid, sodium chloride and deionized water in a kettle., reactor temperature is 44 DEG C, stirring
Mix 1.7 hours；
(2) in the solution of step (1), sodium hexameta phosphate, sodium pyrophosphate, acrylic acid, ammonium nitrate and sulfamic acid are added,
In reactor, temperature rises to 69 DEG C, continues reaction 1.9 hours；
(3) in step (2) resulting solution, add initiator and acrylic resin cementing agent, separate out precipitation；
(4) centrifugal treating, acquisition solid, dry under the conditions of 109 DEG C and can obtain scale cleaning agent.
The solid scale preventing and removing agent scale inhibition performance that the program prepares is 98.9%, and drug effect reaches 1.3a deenergized period；Nontoxic nothing erosion,
Safe and reliable, easy and simple to handle.
Embodiment 4:
A kind of Anticrustator for descaling boiler, is made by following raw material weight number proportioning: citric acid 40 parts, hydrochloric acid 30 parts, chlorine
Change 25 parts of sodium, sodium hexameta phosphate 25 parts, sodium pyrophosphate 16 parts, 22 parts of acrylic acid, ammonium nitrate 18 parts, sulfamic acid 16 parts, cause
Agent 9 parts, acrylic resin cementing agent 11 parts, deionized water 50 parts.
The preparation method of a kind of Anticrustator for descaling boiler, comprises the following steps:
(1) adding citric acid, hydrochloric acid, sodium chloride and deionized water in a kettle., reactor temperature is 48 DEG C, stirring
Mix 2.1 hours；
(2) in the solution of step (1), sodium hexameta phosphate, sodium pyrophosphate, acrylic acid, ammonium nitrate and sulfamic acid are added,
In reactor, temperature rises to 74 DEG C, continues reaction 2.3 hours；
(3) in step (2) resulting solution, add initiator and acrylic resin cementing agent, separate out precipitation；
(4) centrifugal treating, acquisition solid, dry under the conditions of 116 DEG C and can obtain scale cleaning agent.
The solid scale preventing and removing agent scale inhibition performance that the program prepares is 99.3%, and drug effect reaches 1.5a deenergized period；Nontoxic nothing erosion,
Safe and reliable, easy and simple to handle.
Embodiment 5:
A kind of Anticrustator for descaling boiler, is made by following raw material weight number proportioning: citric acid 60 parts, hydrochloric acid 35 parts, chlorine
Change 40 parts of sodium, sodium hexameta phosphate 35 parts, sodium pyrophosphate 25 parts, 25 parts of acrylic acid, ammonium nitrate 22 parts, sulfamic acid 19 parts, cause
Agent 14 parts, acrylic resin cementing agent 16 parts, deionized water 60 parts.
The preparation method of a kind of Anticrustator for descaling boiler, comprises the following steps:
(1) adding citric acid, hydrochloric acid, sodium chloride and deionized water in a kettle., reactor temperature is 56 DEG C, stirring
Mix 2.3 hours；
(2) in the solution of step (1), sodium hexameta phosphate, sodium pyrophosphate, acrylic acid, ammonium nitrate and sulfamic acid are added,
In reactor, temperature rises to 78 DEG C, continues reaction 2.8 hours；
(3) in step (2) resulting solution, add initiator and acrylic resin cementing agent, separate out precipitation；
(4) centrifugal treating, acquisition solid, dry under the conditions of 123 DEG C and can obtain scale cleaning agent.
The solid scale preventing and removing agent scale inhibition performance that the program prepares is 99.9%, and drug effect reaches 1.6a deenergized period；Nontoxic nothing erosion,
Safe and reliable, easy and simple to handle.
Claims (4)
1. the preparation method of an Anticrustator for descaling boiler, it is characterised in that comprise the following steps:
(1) citric acid 25-60 part, hydrochloric acid 15-35 part, sodium chloride 12-40 part and deionized water 35-60 are added in a kettle.
Part, reactor temperature is 35-56 DEG C, stirring mixing 1.2-2.3 hour；
(2) in the solution of step (1), sodium hexameta phosphate 12-35 part, sodium pyrophosphate 8-25 part, acrylic acid 13-25 part, nitre are added
Acid ammonium 8-22 part and sulfamic acid 8-19 part, in reactor, temperature rises to 63-78 DEG C, continues reaction 1.1-2.8 hour；
(3) in step (2) resulting solution, add initiator 3-14 part and acrylic resin cementing agent 4-16 part, separate out precipitation；
(4) centrifugal treating, acquisition solid, dry under the conditions of 102-123 DEG C and can obtain scale cleaning agent.
The preparation method of a kind of Anticrustator for descaling boiler, it is characterised in that step (1) is in reaction
Adding citric acid, hydrochloric acid, sodium chloride and deionized water in still, reactor temperature is 48 DEG C, stirring mixing 1.8 hours.
The preparation method of a kind of Anticrustator for descaling boiler, it is characterised in that to step in step (2)
Suddenly adding sodium hexameta phosphate, sodium pyrophosphate, acrylic acid, ammonium nitrate and sulfamic acid in the solution of (1), in reactor, temperature rises to
74 DEG C, continue reaction 2.3 hours.
The preparation method of a kind of Anticrustator for descaling boiler, it is characterised in that step (4) is by centrifugation
Process, obtain solid, dry under the conditions of 116 DEG C and can obtain scale cleaning agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410683670.8A CN104445646B (en) | 2014-11-25 | 2014-11-25 | A kind of Anticrustator for descaling boiler and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410683670.8A CN104445646B (en) | 2014-11-25 | 2014-11-25 | A kind of Anticrustator for descaling boiler and preparation method thereof |
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| Publication Number | Publication Date |
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| CN104445646A CN104445646A (en) | 2015-03-25 |
| CN104445646B true CN104445646B (en) | 2016-09-14 |
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| CN201410683670.8A Expired - Fee Related CN104445646B (en) | 2014-11-25 | 2014-11-25 | A kind of Anticrustator for descaling boiler and preparation method thereof |
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| CN113415876A (en) * | 2021-06-29 | 2021-09-21 | 江苏云尚环保装备有限公司 | Scale remover for leachate anaerobic system and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048964C (en) * | 1995-03-07 | 2000-02-02 | 中国科学院化学研究所 | High-efficient faintly acid scale preventing and removing agent |
| JP4070551B2 (en) * | 2002-09-17 | 2008-04-02 | 株式会社荏原製作所 | Aqueous scale inhibitor and prevention method |
| CN102146149A (en) * | 2010-02-09 | 2011-08-10 | 天津市特隆生化有限公司 | Novel scale inhibition and dispersion agent |
| CN102198982B (en) * | 2010-03-26 | 2013-03-27 | 中国石油天然气股份有限公司 | Scale and corrosion inhibitor for circulating cooling water |
| CN101786733B (en) * | 2010-04-08 | 2012-07-04 | 山东省特种设备检验研究院淄博分院 | Propenol itaconic acid sulfonate multipolymer scale inhibiting agent and preparation method thereof |
| CN102851672B (en) * | 2012-09-25 | 2014-07-09 | 海尔科化工程塑料国家工程研究中心股份有限公司 | Special antiscaling agent for water heater |
| CN103232571B (en) * | 2013-04-08 | 2015-11-25 | 青岛科海生物有限公司 | A kind of production method of environment-friendlyitaconic itaconic acid polymer water treatment agent |
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Inventor after: Wang Linyun Inventor before: Xia Wujun Inventor before: Ling Yun Inventor before: Lu Saijun Inventor before: Jin Kexin Inventor before: Chen Liang Inventor before: Cheng Sheng Inventor before: Ling Tianyang Inventor before: Lu Ding |
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Effective date of registration: 20160815 Address after: No. 1639 Tianhe town Longwan District Wenzhou City Yongqiang Avenue 325000 in Zhejiang Province Applicant after: Wang Linyun Address before: 215007, building 302, building B, science and Technology Pioneer Park, 31 Soochow North Road, Suzhou, Jiangsu, Wuzhong District Applicant before: SUZHOU YOUJUN ENVIRONMENT SCIENCE & TECHNOLOGY Co.,Ltd. |
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