PULP FROM CAMPHOR TREE AND THE EXTRACTION OF CAMPHOR

Abstract

In Japan, about 35, 000 to 40, 000 cords of camphor tree (Cinnamomum camphor Sieb.) are consumed for extracting camphor in a year. And the wood after extracting camphor is utilized for the fuel only.
When this was cooked by the neutral sulphite semichemical pulping method, we found this pulp can be used for paper.
And when camphor tree was cooked, we can extract the camphor and the camphor oil at the time of recovering liquor and blow.
The results of experiment are outlined as follows :
1). The chips were cooked by the impregnation method, and the ratio of Na₂SO₃to NaHCO₃in the impregnation liquor was 7 : 1.
2). When the wood after camphor extraction was cooked, the chemicals consiumed in the cooking were about 12% based on the oven dry chip, and the yield was 78 to 79%. And when the original wood was cooked, the chemicals were consumed 13% to 15% and the yield was about 77%.
3). There was not a difference of properties between these two pulps, and both have an available paper strength.
4). Fig. shows the apparatus for the camphor extraction. At the time of recovering liquor and blow, the same operation was done. The recovered liquor (the waste liquor) was led to the flask at first. At this time, a part of liquor contains the camphor and the camphor oil goes into the flask as a form of vapour, for even the temperature of recovered liquor as high as 120°C. By this reason, the camphor and the camphor oil are steam-distilled from the liquor spontaneously. In this way, we can extract the camphor and camphor oil perfectly, especially the former, simulataneously with pulping.The properties of camphor and camphor oil extacted by this way remain the sameas that extracted by the normal steam-distillation.