Methylhydroxyethyl cellulose

Fluid loss additives such as solid particles and water-thickening polymers may be added to the drilling mud to reduce fluid loss from the well bore to the formation. Insoluble and partially soluble fluid loss additives include bentonite and other clays, starch from various sources, crushed walnut hulls, lignite treated with caustic or amines, resins of various types, gilsonite, benzoic acid flakes, and carefully sized particles of calcium borate, sodium borate, and mica. Soluble fluid loss additives include carboxymethyl cellulose (CMC), low molecular weight hydroxyethyl cellulose (HEC), carboxy-methYlhydroxyethyl cellulose (CMHEC), and sodium acrylate. A large number of water-soluble vinyl copolymers and terpolymers have been described as fluid loss additives for drilling and completion fluids in the patent literature. However, relatively few appear to be used in field operations. 

Methylhydroxyethyl cellulose (MHEC) Water and GI fluids Similar to HPMC but less soluble in organic solvents... 

Figure 1 Electropherograms of the casein fraction of a mixture of one-third each of bovine, ovine, and caprine miik. Peak identification 1, bovine asi-casein 2, ovine asi-casein 3, bovine K-casein 4, ovine K-casein 5, bovine jS-casein Ak 6, caprine k-casein 7, bovine S-casein A 8, ovine 2-casein and caprine p2-casein 9, ovine j8i-casein and caprine, -casein. Conditions hydrophilic coated fused-silica capillary 50 pm i.d. x 57 cm separation buffer, 6 mol I" urea, 0.32 mol I citric acid, 20 mmol I sodium citrate, pH 3.0, containing 0.5gr methylhydroxyethyl-cellulose applied voltage, 25 kV injection, 15 s temperature, 45°C. (Reprinted with permission from Molina E, Martin-Alvarez PJ, and Ramos M (1999) Analysis of cows , ewes and goats milk mixtures by capillary electrophoresis Quantification by multivariate regression analysis. International Dairy Journal 9 99-105 Elsevier.)...

Once the surface is pre-treated, the coating slurry needs to be prepared. The most frequently used method is to prepare a dispersion of the finished material, which sometimes includes gelification steps [122]. Ceramic monoliths are usually wash-coated by these means. The catalyst carrier or the catalyst itself [127] is mixed with a binder, such as poly(vinyl alcohol) or methylhydroxyethyl cellulose [128], add and solvent, usually water. Lower particle sizes improve the adhesion [129,130]. For ceramic monoliths, the particle size should be in the same range as the... 

Cellulosic thickeners are among the most commonly used thickeners for decorative latex-based paints. They are produced by chemical modifications of cellulose such as carboxymethylation or etherification. The most widely used derivatives are hydroxyethyl cellulose, ethylhydroxyethyl cellulose, methylhydroxyethyl cellulose, methylhydroxypropyl cellulose, and sodium carboxymethyl cellulose. The important characteristics that control the properties of different grades of individual derivatives are degree of polymerization, degree of substitution and molar substitution. 

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