@article{oai:kitami-it.repo.nii.ac.jp:00006219,
 author = {佐々木, 満雄 and 岡, 宏 and 井上, 貞信},
 issue = {3},
 journal = {北見工業大学研究報告},
 month = {Feb},
 note = {application/pdf, The sulfonation of peat humic acid with H_2S0_4-BF_3 complex was studied. The conditions of reaction were as follows. The BF_3/H_2S0_4，mol. ratios were 0.067, 0.134, 0.160, 0.186, 0.210, and 0.235 respectively, the experiments were treated at the reaction time of 10?360 min. and at the temp. of 20?150℃. The ion exchange capacity of sulfonation products was measured by 0.2 N CaCl_2 solution. The results of the above researchs were as follows. The best condition of reaction was shown in the case where BF_3/H_2S0_4 mol. Ratio was 0.134, reaction temp. was 100℃ and that reaction time was 90 min. At this condition of reaction was produced ion exchanger of which ion exchange capacity had been 1.35 m.eq./g.},
 pages = {365--370},
 title = {三フッ化ホウ素を触媒とした泥炭フミン酸のスルホン化},
 volume = {2},
 year = {1969}
}