Citation

Zeronian, S. H. and D. L. Brink, Analysis of rice straw as papermaking and dissolving pulp grades. Comprehensive Research on Rice Annual Report, Project No. RS-7, University of California and United States Department of Agriculture, pp 158-197, 1983.

Abstract

CONCISE GENERAL SUMMARY OF CURRENT YEAR'S RESULTS Development of a process for the production of a dissolving-grade pulp was digested primarily at narrowing specifications of conditions to be used in the four principle manufacturing steps; namely, acid pretreatment, pulping, bleaching, and finally alkaline refining. A study of bleaching conditions and results obtained has provided the data base to evaluate the efficacy of the previous steps. Based upon studies carried out in 1983 it is now possible to specify nitric oxide-oxygen (NO) as the preferred pretreatment step. This selection is based upon; the relative ease of delignification in the subsequent soda pulping step, the low kappa numbers of the resulting unbleached pulp that can be produced, the resulting low requirement of these pulps for bleaching chemical, the minimal levels of ash and silica in the bleached pulps produced, and the desirable properties of the cellulose in the dissolving pulps that are prepared. Conditions used in pulping include low temperature (130-140°C) for short times (2-4 minutes). These mild conditions substantially simplify the pulping process and dramatically increase the rated capacity of conventional pulping equipment that can be used. The bleaching process selected, of four studied, is a five stage (CEHEH) sequence that has been used commercially with wood for over five decades.

Country, State, District, etc.

United States, California

Language

English

Material

rice straw

Use category

paper