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Viscosity of polysaccharides

Brine composition and polymer type should be considered together, and could lead to improved control of the viscosity of polysaccharide based drilling fluids. [Pg.172]

Table 8. Viscosity of polysaccharides in solution (cP) (modified after Belitz and Grosch 19>)... Table 8. Viscosity of polysaccharides in solution (cP) (modified after Belitz and Grosch 19>)...
Ratio of Intrinsic Viscosity of Polysaccharide Dispersions Heated (Enr ]fc) for 15 min at I2I°C and the Corresponding Unheated ([i)]c) Controls"... [Pg.116]

FIGURE 6.15 Viscosity of polysaccharide solutions. Specific viscosity at very low shear rate r /r]s — 1)0 versus dimensionless concentration (c[>/]0) [>/]0 is the zero shear rate intrinsic viscosity. (From results by E. R. Morris et al. Carbohydr. Polym. 1 (1981) 5. [Pg.194]

A detailed treatment of the molecular structure of several polysaccharides and of the viscosity of polysaccharide solutions is in... [Pg.221]

The viscosity of polysaccharides increases with increasing concentration of the biocides. This increase is attributed to cross-linking of the polysaccharide molecules. There were correspondent increases in millipore filtration ratios and filtration times on the addition of biocides or decrease in filterability. A methodology was established to select the most effective biocide on the basis of compatibility with the polymer and the ability to retard metabolic activity in the microflora of the surface and formation waters. [Pg.819]

Characteristics due to chemical functionalities (e.g., carboxyl groups) of sample components that control solubility of the sample in aqueous media, viscosity of carbohydrate/polysaccharide solutions, and stability of obtained solutions. [Pg.460]

The alternative large scale recovery method to precipitation is ultrafiltration. For concentration of viscous exopolysaccharides, ultrafiltration is only effective for pseudoplastic polymers (shearing reduces effective viscosity see section 7.7). Thus, pseudoplastic xanthan gum can be concentrated to a viscosity of around 30,000 centipoise by ultrafiltration, whereas other polysaccharides which are less pseudoplastic, are concentrated only to a fraction of this viscosity and have proportionally lower flux rates. Xanthan gum is routinely concentrated 5 to 10-fold by ultrafiltration. [Pg.212]

Po and rio are the densities and viscosities of the solvent, P2o,w and rj2o,w the corresponding values at 20.0 °C in water, v is the partial specific volume, which for neutral polysaccharides can often be reasonably estimated from the carbohydrate content [31] and takes on values between 0.5-0.7 ml/g for... [Pg.219]

The lower rates of nutrient absorption associated with diets high in nonstarch polysaccharides are probably due to the increased viscosity of digesta (Vaugelade et al., 2000), which increases the thickness of the unstirred layer overlying the enterocytes and causes anon-specific decline in solute absorption. This explains why diets high in 3-glucans, which are structural carbohydrates and which increase viscosity of digesta, reduce absorption of nutrients and... [Pg.167]

In a recycling system, the aqueous discharge effluent from both centrifiiges is returned to the extractors for additional oil recovery, the water being reused. During this extraction process the viscosity of the emulsions increases because peel polysaccharides, mainly pectins, are transported with the emulsion. Enzymatic breakdown of the internal links of the pectin, catalysed by endopolygalacturonase activity, produces an important decrease in the viscosity of the emulsion [16]. In addition, enzymatic treatment removes pectins from the emulsion and contributes to it destabilization [17]. [Pg.964]

Naturally occurring polysaccharides and their derivatives form the predominant group of water-soluble species generally used as thickeners to impart viscosity to treating fluids [1092]. Other synthetic polymers and biopolymers have found ancillary applications. Polymers increase the viscosity of the fi ac-turing fluid in comparatively small amounts. The increase in fluid viscosity of hydraulic fracturing fluids serves for improved proppant placement and fluid loss control. Table 17 summarizes polymers suitable for fracturing fluids. [Pg.240]

Table 1. Relative Viscosities of Natural Polysaccharide Gelling Agents... Table 1. Relative Viscosities of Natural Polysaccharide Gelling Agents...
Upgrading Biomass enzymatic work for non-food uses of the biomass (new lubricants, emulsifiers (biosurfactants), and viscosity agents (polysaccharides)). [Pg.330]


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See also in sourсe #XX -- [ Pg.20 , Pg.551 , Pg.553 , Pg.554 ]




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Viscosity, polysaccharides

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