Synthesis and characterization of an ionic liquid–carboxylic acid copolymer scale inhibitor and its scale inhibition performance

2019 ◽  
Vol 19 (5) ◽  
pp. 1463-1472 ◽  
Author(s):  
Wenlin Zhang ◽  
Gongwei Li ◽  
Fei Jin ◽  
Yu Huo ◽  
Tengfei Sun ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Ionic Liquid ◽  
Carboxylic Acid ◽  
Magnetic Resonance ◽  
Acrylic Acid ◽  
Inhibition Efficiency ◽  
Hydrogen Sulfate ◽  
Scale Inhibitor ◽  
Acid Copolymer ◽  
Scale Inhibition

Abstract A phosphorus-free scale inhibitor (ionic liquid–carboxylic acid copolymer) was successfully synthesized by the reaction of 1-sulfobutyl-3-vinylimidazolium hydrogen sulfate (SVIS) and acrylic acid (AA). The structure of the product was characterized by Fourier transform infrared spectroscopy (FTIR), hydrogen nuclear magnetic resonance (1H NMR) and carbon-13 nuclear magnetic resonance (13C NMR). Then the scale inhibition efficiency of 1-sulfobutyl-3-vinylimidazolium hydrogen sulfate-acrylic acid (SVIS-AA) copolymer against CaCO3 and CaSO4 was determined. The results indicated that SVIS-AA copolymer showed better scale inhibition efficiency than poly (acrylic acid) (PAA). After that, the effects of temperature and Ca2+ concentration on the scale inhibition efficiency against CaCO3 were studied. Results showed that when the temperature reached 90 °C, the scale inhibition efficiency could still remain 91% at a concentration of 18 mg L−1. When the concentration of Ca2+ reached 1,200 mg L−1, the scale inhibition efficiency could remain 70% at a concentration of 20 mg L−1. At last, the effect of SVIS-AA copolymer on the morphologies of CaCO3 and CaSO4 scale was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

Scale inhibitors with a hyper-branched structure: preparation, characterization and scale inhibition mechanism

RSC Advances ◽  
2016 ◽  
Vol 6 (95) ◽  
pp. 92943-92952 ◽  
Author(s):  
Henghui Huang ◽  
Qi Yao ◽  
Hualin Chen ◽  
Bailing Liu
Keyword(s):  
Inhibition Efficiency ◽  
Water Bodies ◽  
Inhibition Mechanism ◽  
Industrial Water ◽  
Scale Inhibitor ◽  
Phosphorus Pollution ◽  
Scale Inhibition ◽  
New Type ◽  
Branched Structure

In order to improve the scale inhibition efficiency of existing scale inhibitors for industrial water and to reduce the phosphorus pollution of water bodies, a new type of scale inhibitor with a hyper-branched structure has been developed.

Formation and Mitigation of BaSO4 Scale in Oil Fields

2015 ◽  
Vol 814 ◽  
pp. 278-285
Author(s):  
Ming Zhu ◽  
Cheng Qiang Ren ◽  
Yuan Yuan Meng ◽  
Li Liu ◽  
Yun Ping Zheng
Keyword(s):  
Inhibition Efficiency ◽  
Oil Fields ◽  
Scale Inhibitor ◽  
Conductivity Method ◽  
Environment Friendly ◽  
Scale Inhibition ◽  
Negative Role ◽  
Corrosion Inhibition Efficiency ◽  
Effects Of Temperature ◽  
Inhibition Performance

The deposition of BaSO4scale is always found in the oilfield. It is difficult to be removed. Therefore, it plays a negative role to the production. The effects of temperature and water chemistry on BaSO4scale have been investigated by using the conductivity method in this work. An environment-friendly copolymer was prepared to control the scaling of BaSO4. The copolymer was proved by static scale inhibition method, and weight-loss test that it has excellent scale inhibition performance and corrosion inhibition efficiency. Furthermore, FTIR spectra was used to prove that the scale inhibitor was polyepoxysuccinic acid (PESA).

13C Nuclear Magnetic Resonance Studies. 29. 13C Spectra of Some Alicyclic Methyl Esters

1973 ◽  
Vol 51 (13) ◽  
pp. 2092-2097 ◽  
Author(s):  
M. Gordon ◽  
S. H. Grover ◽  
J. B. Stothers
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Carboxylic Acid ◽  
Magnetic Resonance ◽  
Methyl Esters ◽  
Membered Ring ◽  
Model Compounds ◽  
Magnetic Resonance Studies ◽  
13C Nuclear Magnetic Resonance ◽  
Acid Esters ◽  
Shielding Effects

The shielding effects of the carbomethoxyl group on neighboring carbons in the cyclohexane and trans-decalin ring systems have been characterized by 13C n.m.r. examination often model compounds. The data show that sufficient differences are exhibited by axial and equatorial groups to permit stereochemical assignments in related systems. The observed trends are compared with those produced by other functional groups. The three-, four-, and five-membered ring cycloalkae carboxylic acid esters were also examined.

scholarly journals Elucidation and Identification of an Antifungal Compound from Pseudomonas aeruginosa DA3.1 Isolated from Soil in Vietnam

2020 ◽  
Vol 13 (10) ◽  
Author(s):  
Nguyen Thi Trung ◽  
Nguyen Tien Cuong ◽  
Nguyen Thi Thao ◽  
Dao Thi Mai Anh ◽  
Do Thi Tuyen
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Pseudomonas Aeruginosa ◽  
Antifungal Activity ◽  
Carboxylic Acid ◽  
Magnetic Resonance ◽  
13C Nmr ◽  
Bacterial Strain ◽  
Antifungal Compound ◽  
Fusarium Sp ◽  
High Antifungal Activity

Background: Fusarium sp. and Rhizoctonia sp. fungi have been always threats to short-term crops. In Vietnam, corn and soybean suffer serious losses annually. Therefore, it is necessary to utilize an environmentally friendly antifungal compound that is highly effective against phytopathogenic fungi. Pseudomonas sp. is a popular soil bacterial strain and well known for its high antifungal activity. Objectives: This study was carried out to evaluate and assess the antifungal activity of a local bacterial strain namely DA3.1 that was later identified as Pseudomonas aeruginosa. This would be strong scientific evidence to develop an environmentally friendly biocide from a local microorganism strain for commercial use. Methods: The antifungal compound was purified from ethyl acetate extraction of deproteinized cell culture broth by a silica gel column (CH2Cl2/MeOH (0% - 10% MeOH)). The purity of the isolated compound was determined by HPLC, and its molecular structure was elucidated using spectroscopic experiments including one-dimensional (1D) (1H NMR, 13C NMR, DEPT) and two-dimensional (2D) (HMBC and HSQC) spectra. The activity of the purified compound against Fusarium sp. and Rhizoctonia sp. fungi was measured using the PDA-disk diffusion method, and its growth-promoting ability was evaluated using the seed germination test of corn and soybean. Results: The results showed that the antifungal compound produced by Pseudomonas aeruginosa DA3.1 had a retention factor (Rf) of 0.86 on thin layer chromatography (TLC). Based on the evidence of spectral data including proton nuclear magnetic resonance (1H NMR), carbon nuclear magnetic resonance (13C NMR), distortionless enhancement by polarization transfer (DEPT), heteronuclear multiple bond correlation (HMBC), and heteronuclear single quantum coherence (HSQC), the chemical structure was elucidated as phenazine-1-carboxylic. The purified compound showed inhibitory activity against F. oxysporum and R. solani and exhibited the ability of the germination of corn and soybean seeds. The results revealed the benefit of native P. aeruginosa DA3.1 and phenazine-1-carboxylic acid for use as a biocontrol agent, as well as a plant growth promoter. Conclusions: The antifungal compound isolated from local Pseudomonas DA3.1 was identified as phenazine-1-carboxylic acid that posed high antifungal activity and was a plant germination booster.

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