DIELECTRIC-CONSTANT MEASUREMENT OF LIGNIN BY CHEMICAL OSCILLOMETRY

The dielectric constant of isolated and purified lignin, obtained from black liquor, has been evaluated using a high frequency chemical osci llometer. The value of dielectric constant obtained above has been dou bly verified by theoretical analysis as well as by an experimental tec hnique. The values determined by all the three methods lie in the rang e 7.70 - 7.98, having a mean value of 7.86. Although the chemical osci llometer is basically used for the dielectric constant measurement of liquid samples, it has successfully been used for the powdered solid s amples.