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Reaction Kinetics and Subsequent Rheology of Carboxymethyl Guar Gum Produced from Guar Splits
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2018-05-22 , DOI: 10.1021/acs.iecr.8b00782
Jie Gao 1 , Brian P. Grady 1
Affiliation  

Carboxymethyl guar gum (CMG) has been widely used in various industrial fields, although its use is especially important in hydraulic fracturing operations because of the high viscosity of its aqueous solutions and the ability to reversibly cross-link the material. However, detailed reaction kinetics for production of carboxymethyl guar has not been previously reported. In this study, we use a two-step environmentally friendly method to produce carboxymethyl guar gum by chemical modification of guar gum (GG) splits. We quantify conversion by NMR spectroscopy and wet chemistry methods and establish a structure and property relationship based on the rheological properties of corresponding CMG products. In addition, borate and zirconium cross-linkers are applied to study the rheological effect of cross-linking on GG and CMG aqueous solutions. Furthermore, we investigate, for the first time, the reaction kinetics of carboxymethylation of guar splits and report a rate equation to quantify the reaction kinetics.

中文翻译:

瓜尔胶分裂产生的羧甲基瓜尔胶的反应动力学和随后的流变学

羧甲基瓜尔胶(CMG)已被广泛用于各种工业领域,尽管由于其水溶液的高粘度和可逆性交联材料的能力,其在水力压裂操作中尤为重要。但是,以前没有关于羧甲基瓜尔胶生产的详细反应动力学的报道。在这项研究中,我们使用两步环保方法通过瓜尔豆胶(GG)碎片的化学改性来生产羧甲基瓜尔豆胶。我们通过NMR光谱法和湿化学方法对转化率进行定量,并根据相应CMG产品的流变性质建立结构与性质之间的关系。此外,硼酸盐和锆交联剂用于研究交联对GG和CMG水溶液的流变效应。
更新日期:2018-05-22
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