申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0490672A2
公开(公告)日:1992-06-17
After a copolymer of ethylene and an alpha-olefin of at least 3 carbon atoms (e.g. propylene) and optionally also a non-conjugated diene has been prepared with the use of a vanadium catalyst and an organoaluminum (e.g. alkyl) compound, the residual catalyst is removed from the polymerisation reaction mixture in a hydrocarbon solvent (e.g. hexane) by
(a) when the catalyst also includes a halogenated ester compound, mixing the reaction mixture with stirring into an aqueous solution of an alkaline compound (e.g. hydroxide of Li, Na or K) in an amount to give an aqueous phase pH of at least 10; or
(b) the halogenated ester compound being optional, oxidising the reaction mixture with an oxidising agent (preferably O₂), e.g. to convert the vanadium to pentavalent V, in an aqueous alkaline solution as in (a).
The organic phase is then separated and washed with water and the polymer is recovered therefrom.
The catalyst residue is thus reduced to very low levels, so that the copolymer is not affected thereby.
在使用钒催化剂和有机铝(如烷基)化合物制备出乙烯和至少 3 个碳原子的 α-烯烃(如丙烯)以及非共轭二烯的共聚物后,在烃类溶剂(如己烷)中通过以 下方法从聚合反应混合物中除去残留的催化剂
(a) 当催化剂还包括卤代酯化合物时,在搅拌下将反应混合物混入碱性化合物(如 Li、Na 或 K 的氢氧化物)的水溶液中,其用量应使水相 pH 值至少为 10;或
(b) 卤化酯化合物是可选的,在碱性水溶液中用氧化剂(最好是 O₂)氧化反应混 合物,例如将钒转化为五价钒,如 (a) 所述。
然后分离有机相并用水洗涤,从中回收聚合物。
这样,催化剂的残留量就降到了很低的水平,从而使共聚物不受影响。