CN107903249A - Diethylidene amine (2 benzotriazole) (2 ' Long carbon chain alkylene) bi-imidazoline corrosion inhibiter and preparation method - Google Patents
Diethylidene amine (2 benzotriazole) (2 ' Long carbon chain alkylene) bi-imidazoline corrosion inhibiter and preparation method Download PDFInfo
- Publication number
- CN107903249A CN107903249A CN201711119184.3A CN201711119184A CN107903249A CN 107903249 A CN107903249 A CN 107903249A CN 201711119184 A CN201711119184 A CN 201711119184A CN 107903249 A CN107903249 A CN 107903249A
- Authority
- CN
- China
- Prior art keywords
- carbon chain
- benzotriazole
- corrosion inhibiter
- long carbon
- imidazoline
- 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.)
- Granted
Links
- NHLYRAPBUCNYQA-MVKOLZDDSA-N CCCCC/C=C/C/C=C/CCCCCCCCC/C(/NCCNCCN1C(c2cccc(N)c2N)=NCC1)=N/CCC Chemical compound CCCCC/C=C/C/C=C/CCCCCCCCC/C(/NCCNCCN1C(c2cccc(N)c2N)=NCC1)=N/CCC NHLYRAPBUCNYQA-MVKOLZDDSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
- C07D405/14—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing three or more hetero rings
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/14—Nitrogen-containing compounds
- C23F11/149—Heterocyclic compounds containing nitrogen as hetero atom
Abstract
The invention discloses a kind of diethylidene amine (2 benzotriazole) (2 ' Long carbon chain alkylene) bi-imidazoline corrosion inhibiter and preparation method thereof, the structural formula of the corrosion inhibiter isR represents carbochain number as C in formula7~C23Mono alkenyl or diene base, it is using tetren, 4 carboxy benzotriazoles and Long carbon chain olefinic carboxylic acid as raw material, dimethylbenzene is azeotropic agent, amidation process is carried out by atmospheric pressure reflux and two step temperature-raising method of reduced-pressure backflow under microwave condition and cyclization is prepared, there is short reaction time, heating Quick uniform, efficient, penetration is strong, product is easily isolated.Benzotriazole group is introduced in inhibitor structure of the present invention, strengthens its corrosion inhibition to copper, can be applied not only in coal ethanol petrol slow down the corrosion to copper, and can be applied to acid medium or containing CO2And H2To slow down the corrosion to carbon steel in the oil field extracted water of S.
Description
Technical field
The invention belongs to oil product additive technology field, and in particular to a kind of two Asias available for coal ethanol petrol
Ethylamine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline corrosion inhibiter, and the preparation method of the corrosion inhibiter.
Background technology
On September 13rd, 2017,15 department such as National Development and Reform Commission, National Energy Board, Ministry of Finance, which combines, to print and distribute《On
Expand bio-fuel alcohol production and the embodiment for promoting the use of vehicle-use alcohol gasoline》, clearly to the year two thousand twenty, in the whole country
Vehicle-use alcohol gasoline is inside promoted the use of, realizes all standing substantially.40 countries and regions have been had more than at present promotes bio-fuel
Ethanol and vehicle-use alcohol gasoline, it is a major issue benefited the nation and the people to promote the use of vehicle-use alcohol gasoline, is conducive to alleviate oil money
The situation of source shortage, improves atmosphere quality, has its own strategic significance to national economy sustainable development.
Alcohol fuel, because its is inflammable, high density characteristic is also used to blended gasoline, part substitute fossil fuels；Wherein, it is raw
Biomass fuel ethanol is because with the comprehensive advantage such as renewable, environmental-friendly, technology maturation, easy to use, easy to spread, becoming reason
The gasoline component thought.But with the popularization of ethanol petrol, alcohol fuel insufficiency of supply-demand will be in expansion trend；In development fuel
While ethanol, for Ensuring Food Safety, National Development and Reform Committee exists《Regenerative resource Long-and Medium-term Development is planned》Clearly propose, no
The fuel ethanol production ability using grain as raw material is further added by, rationally utilizes non-grain biomass material production alcohol fuel, coal system
Ethanol will welcome opportunity to develop.
The content of the invention
The technical problems to be solved by the invention are that providing one kind has good dissolubility, and performance is stablized, right
Active sulfide and corrosion inhibiter of the copper corrosion with very strong rejection ability caused by the combustion oxidation of ethanol.
Corrosion inhibiter is diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain used by solving above-mentioned technical problem
Alkylene) bi-imidazoline, its structural formula is as follows：
R represents carbochain number as C in formula7~C23Mono alkenyl or diene base, preferably 19 carbene bases of 10-, 15 carbene bases,
17 carbon dialkylenes of 8,11-, undecenyl, 8- heptadecenes base, 19 carbon dialkylenes of 10,13-, 15 carbon diene of 8,11-
Any one in base, 12- heneicosenes base, 10- heneicosenes base, 9- hexadecene bases.
The preparation method of corrosion inhibiter of the present invention is：4- carboxy benzotriazoles and tetren are added into dimethylbenzene
In, under microwave condition, first stir reaction 5~10 minutes for 70~80 DEG C, then addition Long carbon chain olefinic carboxylic acid (R-COOH), 120
~140 DEG C of back flow reactions 30~40 minutes, then be warming up to 160~180 DEG C of reduced-pressure backflows and react 20~30 minutes, cool down, rotation
Evaporation removes removal xylene, obtains diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline corrosion inhibiter,
Its reaction process is as follows：
In above-mentioned preparation method, preferably 4- carboxy benzotriazoles and tetren, mole of Long carbon chain olefinic carboxylic acid
Than for 1:2~2.5:1.
In above-mentioned preparation method, preferably the power of microwave is 100~600W.
Compared with prior art, beneficial effects of the present invention are：
(1) diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline of the invention for sun from
Subtype corrosion inhibiter, compared with common single imidazoline, introduces active group benzotriazole, it is delayed copper in its structure
Erosion effect is strengthened.
(2) corrosion inhibiter of the invention has good dissolubility in ethanol petrol, and performance is stablized, and activity is vulcanized
Thing and copper corrosion has very strong rejection ability caused by the combustion oxidation of ethanol, can be applied not only to coal ethanol
Slow down the corrosion to copper in gasoline, and can be applied to acid medium or containing CO2And H2To slow down pair in the oil field extracted water of S
The corrosion of carbon steel.
(3) corrosion inhibiter of the invention not only can be used alone, but also can have very strong with other anti-corrosive aids compounding uses
Cooperative effect.
(4) compared with traditional imidazoline synthetic method, the preparation method of corrosion inhibiter of the present invention uses microwave chemical reaction
Device, has the characteristics that heating Quick uniform, efficient, penetration is strong, the reaction time is short, product is easily isolated.
Embodiment
With reference to embodiment, the present invention is described in more detail, but protection scope of the present invention is not limited only to these realities
Apply example.
Embodiment 1
By 20mL dimethylbenzene, 39.76g (0.21mol) tetrens and 11.92g (0.1mol) 4- carboxyls benzo three
Nitrogen azoles is added in 250mL four round flask, then puts it into the MCR-3S microwave chemical reactions of built-in magnetic stirring apparatus
In device, three sections of temperature control programs are adjusted, microwave chemical reactor are opened, first in the case where microwave power is 100W, temperature is 75~78 DEG C
Reaction 6 minutes is maintained, 31.13g (0.1mol) 11- eicosenoic acids is then slowly added to, 130~135 DEG C is warming up to after adding,
The back flow reaction 35 minutes in the case where microwave power is 250W, then 165~170 DEG C are warming up to, depressurized back in the case where microwave power is 500W
Stream reaction 20 minutes, obtains rufous liquid, cools down, and vacuum revolving recycling dimethylbenzene, obtains viscous brown shape liquid --- (1,
1 '-diethylidene amine)-(2- benzotriazole)-(2 ' -10-, 19 carbene bases) bi-imidazoline corrosion inhibiter, the following institute of its structural formula
Show：
Embodiment 2
By 20mL dimethylbenzene, 43.51g (0.229mol) tetrens and 11.45g (0.096mol) 4- carboxyl benzos
Triazole is added in 250mL four round flask, and the MCR-3S microwave chemicals for then putting it into built-in magnetic stirring apparatus are anti-
Answer in device, adjust three sections of temperature control programs, open microwave chemical reactor, first microwave power be 100W, temperature be 70~73 DEG C
It is lower to maintain reaction 8 minutes, 25.26g (0.099mol) 2- gaidic acids are then slowly added to, 120~125 are warming up to after adding
DEG C, the back flow reaction 32 minutes in the case where microwave power is 250W, then 170~175 DEG C are warming up to, depressurized in the case where microwave power is 500W
Back flow reaction 20 minutes, obtains rufous liquid, cooling, and vacuum revolving recycling dimethylbenzene, obtains viscous brown shape liquid ---
(1,1 '-diethylidene amine)-(2- benzotriazole)-(2 '-ten five carbene base) bi-imidazoline corrosion inhibiter, the following institute of its structural formula
Show：
Embodiment 3
By 20mL dimethylbenzene, 40.82g (0.216mol) tetrens and 11.59g (0.097mol) 4- carboxyl benzos
Triazole is added in 250mL four round flask, and the MCR-3S microwave chemicals for then putting it into built-in magnetic stirring apparatus are anti-
Answer in device, adjust three sections of temperature control programs, open microwave chemical reactor, first microwave power be 100W, temperature be 72~75 DEG C
It is lower to maintain reaction 5 minutes, 28.33g (0.101mol) 9,12- octadecadienoic acids are then slowly added to, 135 are warming up to after adding
~140 DEG C, the back flow reaction 38 minutes in the case where microwave power is 250W, then 175~180 DEG C are warming up to, it is 500W in microwave power
Lower reduced-pressure backflow reacts 28 minutes, obtains rufous liquid, cools down, and vacuum revolving recycling dimethylbenzene, obtains viscous brown shape liquid
Body --- (1,1 '-diethylidene amine)-(2- benzotriazole)-(17 carbon dialkylene of 2 ' -8,11-) bi-imidazoline corrosion inhibiter,
Its structural formula is as follows：
Embodiment 4
By 20mL dimethylbenzene, 42.18g (0.223mol) tetrens and 12.28g (0.103mol) 4- carboxyl benzos
Triazole is added in 250mL four round flask, and the MCR-3S microwave chemicals for then putting it into built-in magnetic stirring apparatus are anti-
Answer in device, adjust three sections of temperature control programs, open microwave chemical reactor, first microwave power be 100W, temperature be 77~80 DEG C
It is lower to maintain reaction 7 minutes, 18.85g (0.095mol) 2- dodecenoic acids are then slowly added to, 130~135 are warming up to after adding
DEG C, the back flow reaction 36 minutes in the case where microwave power is 250W, then 160~165 DEG C are warming up to, depressurized in the case where microwave power is 500W
Back flow reaction 30 minutes, obtains rufous liquid, cooling, and vacuum revolving recycling dimethylbenzene, obtains viscous brown shape liquid ---
(1,1 '-diethylidene amine)-(2- benzotriazole)-(2 '-undecenyl) bi-imidazoline corrosion inhibiter, the following institute of its structural formula
Show：
Embodiment 5
In the present embodiment, with the 11- eicosenoic acids in equimolar 9- octadecenoic acids alternative embodiment 1, other steps
It is same as Example 1, obtain (1,1 '-diethylidene amine)-(2- benzotriazole)-(2 ' -8- heptadecenes base) bi-imidazoline
Corrosion inhibiter, its structural formula are as follows：
Embodiment 6
In the present embodiment, with equimolar 11, the 11- eicosenoic acids in 14- eicosadienoic acids alternative embodiment 1, its
Its step is same as Example 1, obtains (1,1 '-diethylidene amine)-(2- benzotriazole)-(19 carbon diene of 2 ' -10,13-
Base) bi-imidazoline corrosion inhibiter, its structural formula is as follows：
In order to prove beneficial effects of the present invention, reference is tested《Oil product copper strip test method》(GB 5096-85)
The test procedure requirement of 6.1.3 vehicle-use alcohol gasolines, have rated the bi-imidazoline inhibition of the preparation of embodiment 1~6 respectively in standard
Agent and common oil-soluble imidazoline, compound corrosion inhibitor (host agent and the auxiliary agent that benzotriazole or both compounds are host agent
Mass ratio be 1:4, auxiliary agent is n-butanol and ethylenimine mass ratio is 3:1 mixture) to meeting《Copper is classified》(GB 466-
82) corrosion inhibition of No. 2 copper in coal ethanol petrol in, to strengthen experiment condition, 0.5% is added into ethanol petrol
Formic acid and 0.5% acetic acid, corrosion inhibiter dosage are 200mg/L, and experimental result is shown in Table 1.
Corrosion inhibition of the table 1 using different imidazoline inhibitors as the composite corrosion inhibitor of host agent
As shown in Table 1, in coal ethanol petrol, based on the bi-imidazoline corrosion inhibiter of the preparation of the embodiment of the present invention 1~6
The composite corrosion inhibitor of agent compounding meets index request to the corrosion inhibition of copper sheet, and is substantially better than with oil-soluble imidazoline inhibition
The compound of agent, benzotriazole or both is the composite corrosion inhibitor of host agent compounding.
Claims (5)
1. a kind of diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline corrosion inhibiter, its feature exist
It is as follows in the structural formula of the corrosion inhibiter：
R represents carbochain number as C in formula7~C23Mono alkenyl or diene base.
2. diethylidene amine according to claim 1-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline
Corrosion inhibiter, it is characterised in that：The R represents 19 carbene bases of 10-, 15 carbene bases, 17 carbon dialkylenes of 8,11-, 11
Carbene base, 8- heptadecenes base, 19 carbon dialkylenes of 10,13-, 15 carbon dialkylenes of 8,11-, 12- heneicosenes base, 10-
Any one in heneicosene base, 9- hexadecene bases.
A kind of 3. diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline described in claim 1
The preparation method of corrosion inhibiter, it is characterised in that：4- carboxy benzotriazoles and tetren are added in dimethylbenzene, micro-
Under the conditions of ripple, first 70~80 DEG C of stirrings are reacted 5~10 minutes, then add Long carbon chain olefinic carboxylic acid, 120~140 DEG C of back flow reactions
30~40 minutes, then be warming up to 160~180 DEG C of reduced-pressure backflows and react 20~30 minutes, cooling, rotary evaporation removes removal xylene,
Obtain diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline corrosion inhibiter；
The structural formula of above-mentioned Long carbon chain olefinic carboxylic acid is R-COOH, and wherein R represents carbochain number as C7~C23Mono alkenyl or diene
Base.
4. diethylidene amine according to claim 3-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline
The preparation method of corrosion inhibiter, it is characterised in that：The 4- carboxy benzotriazoles and tetren, Long carbon chain olefinic carboxylic acid
Molar ratio is 1: 2~2.5: 1.
5. diethylidene amine according to claim 3-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline
The preparation method of corrosion inhibiter, it is characterised in that：The power of the microwave is 100~600W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711119184.3A CN107903249B (en) | 2017-11-14 | 2017-11-14 | Diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline corrosion inhibiter and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711119184.3A CN107903249B (en) | 2017-11-14 | 2017-11-14 | Diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline corrosion inhibiter and preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107903249A true CN107903249A (en) | 2018-04-13 |
| CN107903249B CN107903249B (en) | 2019-10-22 |
Family
ID=61844054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711119184.3A Expired - Fee Related CN107903249B (en) | 2017-11-14 | 2017-11-14 | Diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline corrosion inhibiter and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107903249B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371401A (en) * | 2018-12-21 | 2019-02-22 | 陕西省石油化工研究设计院 | A kind of polyoxyethylene ether imidazoline sulfonate corrosion inhibiter and preparation method thereof |
| CN114574183A (en) * | 2022-02-15 | 2022-06-03 | 陕西化工研究院有限公司 | CO (carbon monoxide)2Imidazoline-pyridine composite corrosion inhibitor for oil displacement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2724695A (en) * | 1953-04-27 | 1955-11-22 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
| CN103539786A (en) * | 2013-10-25 | 2014-01-29 | 武汉工程大学 | Benzotriazole imidazoline and derivative and synthesis process and application thereof |
| CN104513991A (en) * | 2014-12-16 | 2015-04-15 | 中国石油天然气股份有限公司 | Imidazoline corrosion inhibitor, synthetic method and application thereof |
| CN106543083A (en) * | 2016-11-04 | 2017-03-29 | 中海油天津化工研究设计院有限公司 | A kind of absorption film-forming type imidazoline inhibitor and preparation method thereof |
| CN107253945A (en) * | 2017-07-04 | 2017-10-17 | 华东交通大学 | BTA imidazolidine derivatives and its preparation method and application |
-
2017
- 2017-11-14 CN CN201711119184.3A patent/CN107903249B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2724695A (en) * | 1953-04-27 | 1955-11-22 | Cities Service Res & Dev Co | Method of inhibiting corrosion of metals |
| CN103539786A (en) * | 2013-10-25 | 2014-01-29 | 武汉工程大学 | Benzotriazole imidazoline and derivative and synthesis process and application thereof |
| CN104513991A (en) * | 2014-12-16 | 2015-04-15 | 中国石油天然气股份有限公司 | Imidazoline corrosion inhibitor, synthetic method and application thereof |
| CN106543083A (en) * | 2016-11-04 | 2017-03-29 | 中海油天津化工研究设计院有限公司 | A kind of absorption film-forming type imidazoline inhibitor and preparation method thereof |
| CN107253945A (en) * | 2017-07-04 | 2017-10-17 | 华东交通大学 | BTA imidazolidine derivatives and its preparation method and application |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109371401A (en) * | 2018-12-21 | 2019-02-22 | 陕西省石油化工研究设计院 | A kind of polyoxyethylene ether imidazoline sulfonate corrosion inhibiter and preparation method thereof |
| CN114574183A (en) * | 2022-02-15 | 2022-06-03 | 陕西化工研究院有限公司 | CO (carbon monoxide)2Imidazoline-pyridine composite corrosion inhibitor for oil displacement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107903249B (en) | 2019-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107903249B (en) | Diethylidene amine-(2- benzotriazole)-(2 '-Long carbon chain alkylene) bi-imidazoline corrosion inhibiter and preparation method | |
| US20150053161A1 (en) | Oxygenated fuel | |
| US8784095B2 (en) | Oxygenated fuel | |
| CN102517101A (en) | Automobile methanol diesel fuel and preparation method thereof | |
| EP2862917A1 (en) | Quaternary ammonium detergent fuel additives | |
| CN105296023B (en) | A kind of fuel oil additive and preparation method thereof | |
| CN103194250A (en) | High-sulfur fertilizer coal modification method and application thereof in coking coal blending | |
| CN105296022B (en) | Fuel additive and preparation method thereof | |
| CN111500328B (en) | Methanol fuel composite additive | |
| Liu et al. | Highly Selective Upgrading of Biomass‐Derived Alcohol Mixtures for Jet/Diesel‐Fuel Components | |
| CN102965160A (en) | Nano biofuel taking gutter oil as raw material and preparation method thereof | |
| CN103725335B (en) | Preparation method of corrosion inhibitor of methanol gasoline | |
| CN104830381A (en) | Clean fuel for CFMV (Clean Fuel Based on Methanol for Motor Vehicles) vehicles and preparation method thereof | |
| CN108676587B (en) | Micro-emulsified fuel oil prepared from waste animal fat and processing method thereof | |
| CN100462423C (en) | Composite catalyzing alcohol ether gasoline with no lead, and method of preparation | |
| CN104845681A (en) | Preparation method of corrosion inhibitor for methanol gasoline | |
| CN101633858B (en) | Biodiesel complexing agent | |
| Gong et al. | Are fermentation products promising feedstock for high-density bio-fuel? domino reactions for upgrading aqueous acetone–butanol–ethanol mixtures | |
| CN105273778B (en) | A kind of preparation method of fuel activating agent | |
| CN104830384A (en) | High cleaness alcohol hydrogen oil for spark ignition internal combustion engine and preparation method thereof | |
| CN104152190B (en) | A kind of biodiesel additive and preparation method thereof | |
| CN104711050B (en) | A kind of compounding RONA and preparation method thereof | |
| CN103131481A (en) | Biosynthetic fuel | |
| CN101270308A (en) | Methanol gasoline additive agent | |
| CN104178767A (en) | Coking wastewater pyrolysis coal gas corrosion inhibitor and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191022 Termination date: 20211114 |