DETERMINATION OF HAZE AND INSOLUBLE RESIDUE AFTER ACETYLATION OF WOODPULP
Abstract
A convenient and rapid procedure is described for determining the haze-foming tendency of woodpulp after acetylation and the amount of insoluble residue in the acetate solution. The method prescribes (1) a pretreatment that involves steeping the sample in water if it is air-dry, followed by steeping t in 85% acetic acid t room temperature, (2) displacement of the dilute acetic acid with glacial acetic acid, () acetylation with a mixture of glacial ACETICACID, ACETIC ANHYRIDE, AND SULFURIC ACID CATALYST, AND (4) measurement of haze and insoluble residue in the acetate solution before and after centrifuging. Approximately 5 hours are required for acetylation and measurement of haze. For a commercial softwood sulfite plp of acetylating grade, the initial haze was 1.6 to 3.0% and the insoluble residue was 0.13 to 0. 32%; after centrifuging, the haze was 1.6 to 2.0%.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1962
- Accession Number
- AD0290717
Entities
People
- F. A. Simmonds
Organizations
- Forest Products Laboratory