| 摘要 |
<p>PURPOSE:To recover a transition metal catalyst remaining in trace amt. in a reaction product obtd. by using the transition metal catalyst efficiently by a simple operation by extracting the reaction product with a halogen-contg. aq. soln. CONSTITUTION:A transition metal catalyst remaining in a reaction product obtd. by using the transition metal catalyst is separated by extracting with a halogen compd. or an aq. soln. contg. halogen. The transition metal catalyst means a simple substance or a compd. of a transition metal which has been used generally as catalyst, including transition metals such as Fe, Co, Ni, Cr, Cu, Rh, Pd, Pt, Ir. Suitable halogen compds. are hydrides and alkali metal salts of F, Cl, I, and Br, and suitable halogens are Cl, and I. Hydrochloric acid (HCl), and hydroiodic acid are particularly preferred. Suitable concn. of the transition metals is within a range from 5wt.% to saturation concn. Preferred vol. ratio of the reaction product/extracting liquid is 99/1-20/80.</p> |
