Abstract
Method for application of agent, which is pregenerated from Borol by the aids of caustic soda and SO2, on bleaching of high yield pulps was investigated in many ways. Although there was no problem on the characters of the generated bleach solution, the yields of sodium hydrasulfide (Na-HS) were fairly low in the range from 65 to 75% for the generating systems of batch operation or imperfactly controlled continuous operation. However, by a well controlled continuous system the yield rised to a value of 86%, and the bleaching effects on RGP and GP using the resulting agent were observed to be very satisfactory as compared to the results using powder Na-HS. NaBO2, which is a by-product in the pregeneration reaction from Borol, was noticed to contribute positively to the bleaching effect, though the extent was not so large.
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