CN109232455A - A kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig and method - Google Patents
A kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig and method Download PDFInfo
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- CN109232455A CN109232455A CN201811261831.9A CN201811261831A CN109232455A CN 109232455 A CN109232455 A CN 109232455A CN 201811261831 A CN201811261831 A CN 201811261831A CN 109232455 A CN109232455 A CN 109232455A
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- gas
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- 238000000034 method Methods 0.000 title claims abstract description 40
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229920000877 Melamine resin Polymers 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000010791 quenching Methods 0.000 title claims abstract description 18
- 230000000171 quenching effect Effects 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 65
- 239000012159 carrier gas Substances 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000005201 scrubbing Methods 0.000 claims abstract description 10
- 238000005086 pumping Methods 0.000 claims abstract description 9
- 210000002700 urine Anatomy 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000002309 gasification Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- JZLWSRCQCPAUDP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;urea Chemical compound NC(N)=O.NC1=NC(N)=NC(N)=N1 JZLWSRCQCPAUDP-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
- C07D251/56—Preparation of melamine
- C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
- C07D251/62—Purification of melamine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention provides a kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig and methods, scrubbing tower is urinated including liquid, the liquid urine scrubbing tower connects gas-liquid separator by pipeline, the gas that the gas-liquid separator separates go out is divided into three tunnels, the first via is that carrier gas passes sequentially through pipeline through carrier-gas separator, carrier gas surge tank, Carrier Gas Compressor, condenser, carrier gas preheater is to reactor, reactor is sequentially connected hot gas cooler, hot wind cyclone separator, hot-air filter, crystallizer and trap, second tunnel is cold air through cold air cyclone separator to crystallizer, third road be vent gas treatment after discharge, helical-lobe compressor air heat source pumping system is connected between the trap and condenser, the invention has the benefit that passing through setting helical-lobe compressor air heat source pumping system, Melamine Production is avoided in the process will High-grade process gas thermal energy is converted to the waste of low-grade steam energy.
Description
Technical field
The present invention relates to technical field of chemical production equipment more particularly to a kind of energy-saving gas phase quenching Melamine Productions
Heat-exchanger rig and method.
Background technique
The production method of domestic and international melamine has dicyandiamide method and urea method by raw material point；There is gas phase by process flow point
Quenching method, liquid phase quenching method and dry catch the method for re-refining；There are high-pressure process, low-pressure process and non-pressure process by operating pressure point；Currently, China
Using urea as raw material produce melamine technology path be mainly low-pressure vapor phase quenching production technology, have specific investment cost compared with
Few, energy consumption and material consumption are lower, there is cost advantage.But while existing low-pressure process gas phase quenching preparation technology of melamine can be net secondary
Producing steam, but the energy of the byproduct steam derives from bunker coal, and compared with large-sized boiler, capacity usage ratio is relatively low.
The process flow of gas phase quenching are as follows: fusing urea is atomized and is entered in reactor, in certain pressure, temperature and is urged
Under agent effect, reaction generates melamine, ammonia, carbon dioxide gas mixture and a small amount of by-product.Gas after reaction enters
The cooling of hot gas cooler is precipitated the high boiling point by-products produced Miller amine of reaction, close white amine crystallization, removes degassing by hot-air filter
Silica gel powder, by product in body.Melamine, ammonia, the carbon dioxide gas come out from filter by top enters crystallizer
It is interior, it is mixed with the 150 DEG C of cold process cycles gas entered from middle part, quenching, temperature drops to 210 DEG C, melamine powder crystallization
It is precipitated, and is discharged together from lower part with gaseous mixture, subsequently into finished product trap, melamine gathers trap bottom, quilt
Send out separator.Contain micro triamine dust from the process gas come out at the top of finished product trap and does not generate melamine
Urea and intermediate product, exchange heat 0 .15Mpa water vapour of by-product into the water in liquid urine scrubbing tower, with its cooler, work at this time
Skill temperature degree will be 150 DEG C or so, and urinate washing, purifying by liquid and three tunnels of process gas after cooling point are sent out: the first via is through carrier gas
It is recycled after compressor boosting as reaction bed carrier gas, the second tunnel device that decrystallizes after Cool gas blower boosts is followed as quenching gas
Ring uses, and third road is into exhaust treatment system.
Have the following problems in production: first is that air conditioning quantity is usually 4 times of load volume or so, the preparation of a large amount of cold air is just anticipated
Taste a large amount of 210 DEG C of high-grade thermal energy are converted into the low-grade steam thermal energy lower than 150 DEG C, and a large amount of power need to be consumed
Energy；Second is that production system needs to heat up to the process gas after liquid urinates washing, purifying as carrier gas through fused salt heat exchanging from 150 DEG C again
Enter reactor to 395 DEG C and carry the melamine, ammonia, carbon dioxide that react and generate well into next production cycle, need to disappear
Consume a large amount of coal.
Summary of the invention
The present invention provides a kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig and methods, pass through air-source heat
It pumps the i.e. inverse Carnot's principle of principle and introduces air screw heat source pumping system, low temperature process gas will during realizing Melamine Production
Thermal energy passes to high temperature carrier gas, achievees the purpose that energy-saving.
It is changed in order to solve the above technical problems, the embodiment of the present application provides a kind of energy-saving gas phase quenching Melamine Production
Thermal, including liquid urinate scrubbing tower, and the liquid urine scrubbing tower connects gas-liquid separator, the gas-liquid separator by pipeline
The gas isolated is divided into three tunnels, and the first via is that carrier gas passes sequentially through pipeline through carrier-gas separator, carrier gas surge tank, carrier gas compression
Machine, condenser, carrier gas preheater to reactor, reactor are sequentially connected hot gas cooler, hot wind cyclone separator, hot gas filtration
Device, crystallizer and trap, the second tunnel are cold air through cold air cyclone separator to crystallizer, and third road is vent gas treatment heel row
It puts, helical-lobe compressor air heat source pumping system is connected between the trap and condenser, the helical-lobe compressor is empty
Air supply heat pump includes helical-lobe compressor, evaporator, condenser, flow control regulating valve；The evaporator be connected to trap with
Between Cool gas blower, the condenser is connected between Carrier Gas Compressor and carrier gas preheater；The helical-lobe compressor, evaporation
Device, condenser, flow control regulating valve form closed cycle system using the raw liquid in road as medium.
A kind of energy-saving gas phase quenching Melamine Production heat-exchange method of the present invention, comprising the following steps:
The process gas come out from trap passes through evaporator, with evaporator heat exchange, medium gasification in heat exchanger is made to absorb heat, work
Skill temperature degree reduces, and is sent into condenser through the pressurized liquefied heating of helical-lobe compressor after medium gasification, process gas is mentioned through Cool gas blower
Enter after urine washes tower purification after pressure and be divided into three road-load gas, cold air and tail gas, carrier gas enters condensation after Carrier Gas Compressor pressurizes
Device and media for heat exchange heat up, and medium pressure release cooling after heat exchange enters helical-lobe compressor and carries out next circulation, the carrier gas into
Enter carrier gas preheater and further heats up 390-400 DEG C into the next circulation of reactor progress
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
By the way that helical-lobe compressor air heat source pumping system is arranged, Melamine Production is avoided in the process for high-grade process gas heat
The waste of low-grade steam energy can be converted to, and needs a large amount of coal heating fused salt after cooling again to improve part as carrier gas
The temperature of process gas is to 395 DEG C of energy waste.In the case where absorption technique gas heat reduces process gas temperature, pass through screw rod
Compressor air heat source pumping system by the heat transfer of absorption to carrier gas, so that reducing energy consumption has saved resource.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the overall structure frame diagram of the embodiment of the present application；
In figure, 1, liquid urine scrubbing tower, 2, gas-liquid separator, 3, carrier-gas separator, 4, carrier gas surge tank, 5, Carrier Gas Compressor, 6,
Condenser, 7, reactor, 8, hot gas cooler, 9, hot wind cyclone separator, 10, hot-air filter, 11, crystallizer, 12, trapping
Device, 13, cold air cyclone separator, 14, helical-lobe compressor, 15, flow control regulating valve, 16, Cool gas blower, 17, carrier gas preheating
Device, 18, evaporator.
Specific embodiment
The present invention provides a kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig and methods, pass through air-source heat
It pumps the i.e. inverse Carnot's principle of principle and introduces air screw heat source pumping system, low temperature process gas will during realizing Melamine Production
Thermal energy passes to high temperature carrier gas, achievees the purpose that energy-saving.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
As shown in Figure 1, a kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig described in the present embodiment, including liquid
Scrubbing tower 1 is urinated, the liquid urine scrubbing tower 1 connects gas-liquid separator 2 by pipeline, what the gas-liquid separator 2 was isolated
Gas is divided into three tunnels, and the first via is that carrier gas passes sequentially through pipeline through carrier-gas separator 3, carrier gas surge tank 4, Carrier Gas Compressor 5, cold
Condenser 6, carrier gas preheater 17 to reactor 7, reactor 7 are sequentially connected hot gas cooler 8, hot wind cyclone separator 9, hot gas mistake
Filter 10, crystallizer 11 and trap 12, the second tunnel are cold air through cold air cyclone separator 13 to crystallizer 11, and third road is
It is discharged after vent gas treatment, helical-lobe compressor air heat source pumping system is connected between the trap 12 and condenser 6, it is described
Helical-lobe compressor air source heat pump include helical-lobe compressor 14, evaporator 18, condenser 6, flow control regulating valve 15；It is described
Evaporator 14 is connected between trap 12 and Cool gas blower 16, and the condenser 6 is connected to Carrier Gas Compressor 5 and carrier gas preheating
Between device 17；The helical-lobe compressor 14, evaporator 18, condenser 6, flow control regulating valve 15 are formed using the raw liquid in road as medium
Closed cycle system.
The process gas come out when work from trap passes through evaporator 18, exchanges heat with evaporator 18, makes medium in heat exchanger
Gasification absorbs heat, and process gas temperature reduces, and is sent into condenser 6, institute through the pressurized liquefied heating of helical-lobe compressor after medium gasification
It states after process gas washes tower purification into urine after 16 pressure-raising of Cool gas blower and is divided into three road-load gas, cold air and tail gas, carrier gas is through overloading
Enter condenser 6 after air compressor pressurization and media for heat exchange heats up, medium pressure release cooling after heat exchange enters screw compression
Machine 14 carries out next circulation, and the carrier gas enters carrier gas preheater and further heats up to 395 DEG C or so entrance reactors progress
Next circulation.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (2)
1. a kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig, which is characterized in that urinate scrubbing tower (1) including liquid, institute
Liquid urine scrubbing tower (1) stated connects gas-liquid separator (2) by pipeline, the gas that the gas-liquid separator (2) is isolated point
For three tunnels, the first via is that carrier gas passes sequentially through pipeline through carrier-gas separator (3), carrier gas surge tank (4), Carrier Gas Compressor (5), cold
Condenser (6), carrier gas preheater (17) to reactor (7), reactor (7) are sequentially connected hot gas cooler (8), hot wind cyclonic separation
Device (9), hot-air filter (10), crystallizer (11) and trap (12), the second tunnel are cold air through cold air cyclone separator
(13) to crystallizer (11), third road is connected between the trap (12) and condenser (6) to discharge after vent gas treatment
Helical-lobe compressor air heat source pumping system, the helical-lobe compressor air source heat pump include helical-lobe compressor (14), evaporator
(18), condenser (6), flow control regulating valve (15)；The evaporator (18) is connected to trap (12) and Cool gas blower
(16) between, the condenser (6) is connected between Carrier Gas Compressor (5) and carrier gas preheater (17)；The helical-lobe compressor
(14), evaporator (18), condenser (6), flow control regulating valve (15) form closed cycle system using the raw liquid in road as medium.
2. a kind of energy-saving gas phase quenching Melamine Production heat-exchange method, it is characterised in that: the following steps are included:
The process gas come out from trap passes through evaporator, with evaporator heat exchange, medium gasification in heat exchanger is made to absorb heat, work
Skill temperature degree reduces, and is sent into condenser through the pressurized liquefied heating of helical-lobe compressor after medium gasification, process gas is mentioned through Cool gas blower
Enter after urine washes tower purification after pressure and be divided into three road-load gas, cold air and tail gas, carrier gas enters condensation after Carrier Gas Compressor pressurizes
Device and media for heat exchange heat up, and medium pressure release cooling after heat exchange enters helical-lobe compressor and carries out next circulation, the carrier gas into
Enter carrier gas preheater and further heats up 390-400 DEG C into the next circulation of reactor progress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811261831.9A CN109232455A (en) | 2018-10-26 | 2018-10-26 | A kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811261831.9A CN109232455A (en) | 2018-10-26 | 2018-10-26 | A kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109232455A true CN109232455A (en) | 2019-01-18 |
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ID=65078736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811261831.9A Pending CN109232455A (en) | 2018-10-26 | 2018-10-26 | A kind of energy-saving gas phase quenching Melamine Production heat-exchanger rig and method |
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| Country | Link |
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| CN (1) | CN109232455A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115944942A (en) * | 2022-12-06 | 2023-04-11 | 四川金象赛瑞化工股份有限公司 | Preparation method of cyanamide substance |
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| CN201971766U (en) * | 2011-04-28 | 2011-09-14 | 四川金圣赛瑞化工有限责任公司 | Energy-saving less-investment gaseous quenching melamine production system |
| CN102410518A (en) * | 2011-09-24 | 2012-04-11 | 安徽金禾实业股份有限公司 | Low-grade heat energy recycling method for liquid urea washing tower |
| CN102452992A (en) * | 2010-10-20 | 2012-05-16 | 郗运柱 | Energy-saving process for producing melamine |
| CN203269828U (en) * | 2013-06-18 | 2013-11-06 | 尹明大 | Tripolycyanamide production system |
| CN108373454A (en) * | 2018-04-08 | 2018-08-07 | 山东鸿运工程设计有限公司 | A kind of melamine preparation device and production technology |
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2018
- 2018-10-26 CN CN201811261831.9A patent/CN109232455A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452992A (en) * | 2010-10-20 | 2012-05-16 | 郗运柱 | Energy-saving process for producing melamine |
| CN201971766U (en) * | 2011-04-28 | 2011-09-14 | 四川金圣赛瑞化工有限责任公司 | Energy-saving less-investment gaseous quenching melamine production system |
| CN102410518A (en) * | 2011-09-24 | 2012-04-11 | 安徽金禾实业股份有限公司 | Low-grade heat energy recycling method for liquid urea washing tower |
| CN203269828U (en) * | 2013-06-18 | 2013-11-06 | 尹明大 | Tripolycyanamide production system |
| CN108373454A (en) * | 2018-04-08 | 2018-08-07 | 山东鸿运工程设计有限公司 | A kind of melamine preparation device and production technology |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115944942A (en) * | 2022-12-06 | 2023-04-11 | 四川金象赛瑞化工股份有限公司 | Preparation method of cyanamide substance |
| CN115944942B (en) * | 2022-12-06 | 2024-04-12 | 四川金象赛瑞化工股份有限公司 | Preparation method of cyanamide substance |
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Application publication date: 20190118 |
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