Water-soluble carboxymethylchitosan as green scale inhibitor in oil wells

Macedo, Ruza Gabriela Medeiros de Araújo; Marques, Nívia do Nascimento; Paulucci, Luciana C.S.; Cunha, João Victor Moura; Villetti, Marcos A.; Castro, Bruno Barbosa; Balaban, Rosângela de Carvalho

doi:10.1016/j.carbpol.2019.03.082

Cited by 86 publications

(42 citation statements)

References 34 publications

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“…的特征峰, 这是引入的羧酸基团上羧基的伸缩振动峰 [16] . 在核磁谱图(图3)中, CMCS样品在化学位移 4.2~4.6 ppm处出现了新的特征峰, 这主要归因于引入的羧甲基上的亚甲基质子 [17] . 上述红外光谱及核磁表征均表明CMCS样品已成功合成.…”

Section: 附近出现一个新unclassified

“…上述红外光谱及核磁表征均表明CMCS样品已成功合成. 根据核磁共振图谱中特征峰的积分面积, 利用MestReNova软件分析处理, 计算各CMCS样品的羧甲基取代度并列于表1 中 [12,16,17] . CMCS实际羧甲基取代度随氯乙酸投加量的增大而升高, 但当氯乙酸与壳聚糖投料比大于1:2 后, 羧甲基取代度变化不大, 这可能是壳聚糖糖环上活性取代位点已趋于饱和.…”

Section: 附近出现一个新unclassified

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Scale and corrosion inhibition performance of carboxymethyl chitosan

Song¹,

Wei²

2021

Sci. Sin.-Chim

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A series of carboxymethyl chitosan (CMCS) with various degrees of carboxymethyl substitution was prepared from two chitosan samples with different molecular weights. Static scale inhibition method, scanning electron microscope (SEM), X-ray diffraction (XRD), weight-loss method, and electrochemical measurements were taken to study the effects of internal structural factors (molecular weight, degree of carboxymethyl substitution, etc.) and external environmental factors (dosage, temperature, etc.) of CMCS on the inhibition of CaCO 3 scale and the corrosion on carbon steel, respectively. The results showed that CMCS had good scale and corrosion inhibition effects. Under the similar degree of carboxymethyl substitution, the scale and corrosion inhibition efficiencies of CMCS with low molecular weight were higher than that with high molecular weight; and the higher the degree of carboxymethyl substitution was, the better scale and corrosion inhibition effects it had. SEM and XRD results indicated that the scale-inhibition mechanisms of CMCS were mainly ascribed to its notable chelation and complexation with Ca 2+ , dispersion effect on CaCO 3 microcrystal, and the distortion of the CaCO 3 lattice, which caused the formation of unstable vaterite and aragonite structures. The results of electrochemical method showed that CMCS was a kind of mixed-type corrosion inhibitors, which could inhibit both cathode and anode reactions. The corrosion inhibition mechanisms were mainly ascribed to that the active functional groups such as hydroxyl, amino and carboxyl groups of CMCS were easy to chelate with Fe to form a monolayer protective film, so as to isolate the corrosion media and achieve the purpose of corrosion inhibition for carbon steel. In short, CMCS, as a green and environmental-friendly water treatment agent, has good scale and corrosion inhibition effect, and a wide application potential.

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Scale and corrosion inhibition performance of carboxymethyl chitosan

Song¹,

Wei²

2021

Sci. Sin.-Chim

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“…With the need to conserve the environment, recent legislation is promoting the use of ecological inhibitors in all industries, including the oil and gas industry [6]. Recently, carboxymethyl chitosan has been studied in different areas of the oil industry: for the extraction of nickel and vanadium from crude oil [7], treatment of oil spills [8] and as scale inhibitors [9]. This paper focuses on comparing the morphology and type of crystals obtained in the solid residue when using a new generation of eco-friendly scale inhibitors, carboxylated chitosan and poly (acrylic acid) (commercial synthetic additive).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Carboxymethyl Chitosan on Calcium Carbonate Precipitation in Synthetic Brines

Bolívar

Colina²,

Delgado

et al. 2021

J. Mex. Chem. Soc.

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Abstract. When oil production by natural flow of reservoirs decreases, it is necessary to increase the production by using improved recovery processes, such as water injection. Injection of incompatible water can cause the formation of saline deposits of calcium and magnesium carbonates. The use of chemical inhibitors to treat incrustations involves the use of chemicals with functional groups such as carboxylic acids (R-COOH) or phosphonates (R-PO32-). A new ecological scale inhibitor, carboxymethyl chitosan (CMC1), has been synthesized and its capacity to modify the CaCO3 crystalline phases obtained in the solid residue was compared with that obtained when using a commercial carboxymethyl chitosan (CMC2) and a commercial poly(acrylic acid). The results show that under the used conditions, the CMC´s produce a slightly larger amount of crystalline phases than the synthetic inhibitor. Using the X-ray powder diffraction technique, calcite, vaterite, and aragonite were identified in the residual solid. The ratio of these phases was modified by increasing the concentration of the inhibitor. Using Scanning Electron Microscopy (SEM), it was observed that increasing the concentration of the CMC's the modifies the crystal´s morphology from plates to spheres. Resumen. Cuando la producción de petróleo por flujo natural disminuye, es necesario aumentar la producción de petróleo crudo y gas mediante procesos de recuperación mejorados. El agua es el líquido que se inyecta y puede provocar la formación de depósitos salinos de carbonato de calcio y magnesio. El uso de inhibidores químicos para el tratamiento de incrustaciones implica el empleo de productos químicos con grupos funcionales del tipo ácido carboxílico (R-COOH) o grupos fosfonatos (R-PO32-). Se sintetizó un nuevo inhibidor de incrustaciones ambientalmente amigable en base a carboximetilquitosano (CMC1), y se compararon las fases cristalinas de CaCO3 obtenidas en el residuo sólido con las obtenidas al utilizar un carboximetilquitosano comercial (CMC2) y un poli (ácido acrílico) comercial. Los resultados muestran que, en las condiciones utilizadas, las CMC producen una cantidad ligeramente mayor de fases cristalinas en comparación con el inhibidor sintético. Mediante la técnica de difracción de rayos X de polvos, en el sólido residual se identificaron las fases: Calcita, Vaterita y Aragonita. La relación de las fases se modificó aumentando la concentración del inhibidor. Mediante Microscopía Electrónica de Barrido (SEM) de los residuos sólidos, se observó que al aumentar la concentración de las CMC's la morfología de los cristales se modificaba de placas a esferas.

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“…It was reported that sodium alginate reduces the rates of crystal growth of calcium carbonate measured under physiological conditions (Manoli, & Dalas, 2002). Also, chitosan derivatives are currently being explored intensively for their applications in water and wastewater treatment, and various modified chitosan have been studied as CaCO 3 scale inhibitor (Guo et al, 2012; Macedo et al, 2019; Zeng et al, 2015; Zhang et al, 2015;) using conductivity and other bulk precipitation tests. However, these tests provide a poor characterization of antiscalant inhibitory capability because they do not provide any information on the adhesive properties of the scale (Abdel‐Gaber et al, 2012; Hasson et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Scale inhibition in industrial water systems using chitosan‐alginate mixture

Khamis

Abd-El-Khalek

Abdel-Kawi

et al. 2021

Water & Environment J

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The study aims to establishing the possibility of using eco‐friendly natural polymers to formulate scale inhibitor for industrial water applications. The performance of a blend of two natural polymers, chitosan and sodium alginate as scale inhibitor in comparison with a commercially available inhibitor formulation, HEDP (Hydroxyethylidene, 1‐Diphosphonic Acid), is carried out using electrochemical measurements, conductivity and NACE test complemented with crystals morphology characterization using optical and electronic microscopic examination. Overall results show that chitosan is more efficient for the inhibition of calcium carbonate scales formation, whilst it has poor efficiency in the inhibition of sulfate scales, whereas sodium alginate has the highest efficiency in inhibiting calcium sulfate scales. However, the addition of sodium alginate to chitosan, as a package, has a dual control effect on carbonate and sulfate scale formation with good efficiency compared to HEDP. This new phosphorus‐free package represents an effective antiscalant to have green environment.

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Water-soluble carboxymethylchitosan as green scale inhibitor in oil wells

Cited by 86 publications

References 34 publications

Scale and corrosion inhibition performance of carboxymethyl chitosan

Scale and corrosion inhibition performance of carboxymethyl chitosan

The Effect of Carboxymethyl Chitosan on Calcium Carbonate Precipitation in Synthetic Brines

Scale inhibition in industrial water systems using chitosan‐alginate mixture

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