| 摘要 |
PCT No. PCT/SE88/00320 Sec. 371 Date Feb. 13, 1989 Sec. 102(e) Date Feb. 13, 1989 PCT Filed Jun. 14, 1988 PCT Pub. No. WO88/10334 PCT Pub. Date Dec. 29, 1988.Process for bleaching of materials, at which an aqueous solution of borohydride containing borohydride corresponding to from 15 to 35 percent by weight of sodium borohydride and hydroxylic ions corresponding to not more than 10 percent by weight of NaOH is brought to react with a bisulfite solution, after which the dithionite solution thus obtained is added to the material to be treated. This process gives a simple and economic preparation of dithionite bleaching solution in situ, in connection with the bleaching. |
