The separation of the by-product (The volume fraction of 3-picoline is 68.472 2% and 4-picoline 26. 517 6% .) in the synthesis of pyridine by dissociation extraction wasstudied. Six separation conditions of the dissoc...The separation of the by-product (The volume fraction of 3-picoline is 68.472 2% and 4-picoline 26. 517 6% .) in the synthesis of pyridine by dissociation extraction wasstudied. Six separation conditions of the dissociation extraction-the kind and the dosage ofextractant and organic solvent, the concentration of the extractant and separation temperature-wereinvestigated. Different levels of each factor were chosen to form an orthogonal test of six factorsand five levels. The results show that the volume ratio of 3-picoline and 4-picoline in organicphase is the highest when 24 mL picolines are separated at 0 t by 2. 0 mol/L p-toluenesulfonic andn-heptane whose dosages are 40 mL and 48 mL, respectively. The effect of the separation isconsiderably improved with repetition test. This process of dissociation extraction has commendablepotential for industrial exploitation.展开更多
A series of ternary complexes of rare earth(Ⅲ)nitrate with benzo-15-crown-5 and 4-picoline N-oxide have been prepared.They have the general formula of RE(NO_3)_3·2(4-picNO)·3H_2O·(1/2)(B-15-C-5) (RE=La...A series of ternary complexes of rare earth(Ⅲ)nitrate with benzo-15-crown-5 and 4-picoline N-oxide have been prepared.They have the general formula of RE(NO_3)_3·2(4-picNO)·3H_2O·(1/2)(B-15-C-5) (RE=La～Tm).Their physico-chemical properties have also been studied with conductance,thermal analysis and IR absorption spectroscopy.展开更多
文摘The separation of the by-product (The volume fraction of 3-picoline is 68.472 2% and 4-picoline 26. 517 6% .) in the synthesis of pyridine by dissociation extraction wasstudied. Six separation conditions of the dissociation extraction-the kind and the dosage ofextractant and organic solvent, the concentration of the extractant and separation temperature-wereinvestigated. Different levels of each factor were chosen to form an orthogonal test of six factorsand five levels. The results show that the volume ratio of 3-picoline and 4-picoline in organicphase is the highest when 24 mL picolines are separated at 0 t by 2. 0 mol/L p-toluenesulfonic andn-heptane whose dosages are 40 mL and 48 mL, respectively. The effect of the separation isconsiderably improved with repetition test. This process of dissociation extraction has commendablepotential for industrial exploitation.
文摘A series of ternary complexes of rare earth(Ⅲ)nitrate with benzo-15-crown-5 and 4-picoline N-oxide have been prepared.They have the general formula of RE(NO_3)_3·2(4-picNO)·3H_2O·(1/2)(B-15-C-5) (RE=La～Tm).Their physico-chemical properties have also been studied with conductance,thermal analysis and IR absorption spectroscopy.
