Sodium carboxymethyl cellulose (CMC) anionic cellulose ethers, appearance for white or light yellow powder or flocculent fibers white powder, odorless, non-toxic; Soluble in cold water or hot water, the formation has certain viscosity of transparent solution. For neutral or slightly alkaline solution, insoluble in ethanol, ethyl ether, isopropyl alcohol, acetone and other organic solvent, can dissolve in water cut of 60% ethanol or acetone solution. Has the water absorbability, the thermal stability, viscosity decreases with temperature rise, and the solution at PH 2 ~ 10 stability, PH less than 2, have a solid precipitation, viscosity lower PH value is higher than 10. Color temperature 227 ℃, carbonization temperature 227 ℃, 2% aqueous solution surface tension 71 mn/n.
By carboxymethyl cellulose derivatives, substituting group treated with sodium hydroxide to form alkali cellulose, and then was prepared with monochloroacetic acid reaction. Composition of fiber hydroxyl of glucose units have 3 can be replaced, so different degree of substitution of products can be obtained. Dry weight per 1 g import 1 tendency carboxymethyl, insoluble in water, dilute acid, but can swelling, used in ion exchange chromatography. Carboxymethyl pKa of about 4 in the pure water, in 0.5 mol/L NaCl is about 3.5, is a weak acid cation exchanger, usually in the above pH4 used in neutral and alkaline protein separation. More than 40% of the hydroxyl of carboxymethyl substitution can dissolve in water to form a stable colloidal solution of high viscosity. Suitable for drink processing