モノエタノールアミンを用いたパルプ蒸解法
1973 年 27 巻 3 号 p. 123-130
詳細
1973 年 27 巻 3 号 p. 123-130
This paper is to present some of the properties of pulp obtained by the new process using “Monoethanol Amine” (MEA) which is the basic organic solvent for lignin. This process is used to investigate the fundamental information for development of the High Yield Pulping method which uses as little water as possible.
Several species of soft and hardwoods were heated with MEA, under atmospheric pressure and also in autoclave under the conditions cited in Tab. 2.
Investigations of the fundamental pulp properties indicated the following conclusions. :
1) This method was found to be more suitable to hardwoods than soft woods.
2) Better Pulps qualities were obtained in cooking under atmospheric pressure than in autoclave.
3) In the cooking process only that amount of MEA sufficient to saturate the wood was necessary.
4) The experience was carried out re-using the waste liquor under the condition cited in Tab. 3-2. The result was that the same quality of pulp was obtained until the fifth operation.
5) In the case of Buna-wood (Beech), the refluxing with MEA for 3 hours under atmospheric pressure yielded a pulp of 65% which contained 5% of Klason-Lignin (namely the degree of delignification was more than 70%, ) about 16% pentosan and 95% holocellulose. The higher viscosities of holocellulose in the cuprammonium method but lower brightness by the Hunter method (23-27% GE) were shown in comparison with those found in ordinary pulp.
