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Study on the Regenerative Gel of Low Molecular Weight Carboxymethyl Guar Gum and Rheological Properties

Author: TangMeiFang
Tutor: FangBo
School: East China University of Science and Technology
Course: Chemical Engineering
Keywords: Oligomeric carboxymethyl guar gum Crosslinked Regeneration Rheological properties Clean fracturing fluid
CLC: TQ316.3
Type: Master's thesis
Year: 2011
Downloads: 142
Quote: 0
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Abstract


In this paper , to guar gum endosperm piece as the main raw material , prepared carboxymethyl guar gum (CMG) and oligomeric carboxymethyl guar the glue ( LMWCMG ) ; the oligomeric carboxymethyl guar gum and borax cross-linked to form a stable gel system its regeneration process , while the effects of the concentration of oligo- carboxymethyl guar gum , borax concentration on the formation and regeneration of the gel system ; further study carboxymethyl guar gum solution and renewable oligomeric carboxymethyl guar gum the rheological properties of the gel system . The following main conclusions : 1 ) through of guar endosperm piece the carboxymethylation Modification , clear the reaction temperature , reaction time , and chloride the - trimethyl hexadecylammonio ( CTAC ) , NaOH and carboxymethylation reagent (CA) the amount of reaction conditions on the apparent viscosity of carboxymethyl guar gum , carboxymethyl substituted and water insolubles content . Get a better process conditions : the 10.0 g melon film with 0.3 g CTAC and 3.0 g NaOH at 25 ℃ under alkalization after 45 min , 4.0 g CA, reaction at 85 ℃ for 120 min . 2) The rheological properties of studies show that the apparent viscosity of the aqueous solution of carboxymethyl guar gum concentration increases with increasing temperature and reduced significantly reduced , with NaCl added . Carboxymethyl guar gum solution is shear thinning non-Newtonian fluid , thixotropy and viscoelasticity . 3) to obtain the degradation of the hydrogen peroxide process of preparing oligomeric carboxymethyl guar gum . Oligomeric carboxymethyl guar gum with borax crosslinked to form a stable gel system ; gel breaking and regeneration process of the gel system can be achieved by adjusting the pH of the system , prove renewable gel system . 4 ) before and after the regeneration oligomeric carboxymethyl guar gum rheological properties of the gel system , the system having a good viscoelastic , thixotropic and shear thinning nature . Nonlinear co-transfected Jeffreys constitutive equation oligomeric carboxymethyl guar gum gel rheology curve can be characterized before and after the regeneration , the good agreement between calculated and experimental values ??. In this paper, for clean and renewable the oligomeric anions guar gum gel system in enhanced oil recovery applications provide the basis of rheological

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CLC: > Industrial Technology > Chemical Industry > Molecular compound Industries ( polymer industry ) > Production process > Polymerization process.
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