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Lignosulfonates agents

Sacrificial adsorption agents such as lignosulfonates (148—151) can be used to reduce the adsorption of more expensive polymers and surfactants. Other chemicals tested include poly(vinyl alcohol) (152), sulfonated poly(vinyl alcohol) (153), sulfonatedpoly(vinylpyrrohdinone) (153), low molecular weight polyacrylates (154), and sodium carbonate (155). [Pg.193]

Lignosulfonate has been reported to increase foam stabihty and function as a sacrificial adsorption agent (175). Addition of sodium carbonate or sodium bicarbonate to the surfactant solution reduces surfactant adsorption by increasing the aqueous-phase pH (176). [Pg.193]

Seawater muds are composed of bentonite, thinner (lignosulfonate or lignosulfonate and lignite), and an organic filtration control agent. The typical formulation of a seawater mud is 3.5 Ib/bbl of alkali (2 Ib/bbl caustic soda and 1.5 Ib/bbl lime), 8 to 12 Ib/bbl of lignosulfonate, and 2 to 4 Ib/bbl of bentonite to maintain viscosity and filtration. Another approach is to use bentonite/thinner (ligno-sulfonate)/freshwater premix, and mix it with seawater that has been treated for hardness. This technique will be discussed in the saturated saltwater muds section. [Pg.670]

Seawater muds are composed of bentonite, thinner (lignosulfonate or ligno-sulfonate with lignite), and an organic filtration control agent. [Pg.4]

A mixture of lignosulfonate with modified carboxymethylcellulose and metal ions as crosslinkers has been suggested as a plugging agent [1375]. [Pg.112]

Stabilizing agents are used to maintain drilling fluid rheological properties at highly elevated downhole temperatures. Chromium and chromium-free lignosulfonates, polyglycol ethers, sodium polystyrene sulfonate-co-maleic anhydride), and a melanin polymer have been used in this application. Additives such as sodium diethyldi-thiocarbamate have been used to stabilize aqueous polysaccharides such as xanthan gum (18). [Pg.12]

Hall, L. Lignosulfonate as a Dispersing Agent. Svensk Papperstid. 60, 199-210 (1957). [Pg.154]

Fig. 1.33 Reductions in water-cement ratio as a function of aggregate-cement ratio for lignosulfonate and hydroxycarboxylic-acid-based water-reducing agents. Fig. 1.33 Reductions in water-cement ratio as a function of aggregate-cement ratio for lignosulfonate and hydroxycarboxylic-acid-based water-reducing agents.
In the case of lignosulfonate water-reducing agents, the effectiveness in reducing the water-cement ratio diminishes with an increase in either the the C3A or alkali content. In a comparative experiment with three... [Pg.72]

Table 1.19 Elastic modulus of concrete containing a lignosulfonate-based water-reducing agent as a ratio of a plain mix (Tam)... Table 1.19 Elastic modulus of concrete containing a lignosulfonate-based water-reducing agent as a ratio of a plain mix (Tam)...
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See also in sourсe #XX -- [ Pg.272 ]



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Lignosulfonates

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