CARBOXYL CONTENT OF PULP

• Determination of the content of carboxyl groups in bleached and delignified pulps.
• Method is not applicable to unbleached and semi-bleached pulps.
• Pulp is extracted (de- ashed) with dilute hydrochloric acid, washed, reacted with sodium bicarbonate-sodium chloride solution, and filtered.
• The filtrate is titrated with 0.01 n hydrochloric acid to methyl red end point.
• Carboxyl groups represent the ion-exchange capacity of a pulp.
• Carboxyl groups contribute bonding of fibers and formation of paper
• Carboxyl groups, -cooh, are acidic groups attached to cellulose chains and are formed mainly by oxidation of cellulose during pulping and bleaching processes.
• A certain level of carboxyl groups is also associated with hemicelluloses.

It Provides information on:

• Scope.
• Content.
• Keywords.
• Sampling.
• Procedure.
• Test specimens.
• Apparatus.
• Reagents.

It Benefit:

• Production Manager.
• Technical Manager.
• Researchers.
• Laboratory Personal.