公开(公告)号：DE1520941A1

公开(公告)日：1970-02-19

申请号：DE1520941

申请日：1960-06-07

Applicant: STAMICARBON

Inventor： VAN DEN BERG CORNELIS EMILE PE ,  HENDRIKS HENDRIK ,  JOSEPHUS MUYTJENS MATHIAS

IPC: B01D11/04 ,  B01J19/28 ,  B08B3/12 ,  C07F9/165 ,  C08F6/24

Abstract: Removing catalyst residues from a synthetic polymeric material by a process which comprises continuously passing impure polymeric material with a liquid (1) upwards within a column provided with internal obstructions, and continuously passing a liquid (2), heavier than liquid (1) and at least not completely miscible with (1), downwards within the column, at such a rate that liquid (1) forms a continuous phase in the column, and imparting to the liquids in the column flow pulses at substantially regular time intervals, e.g. by a pump, and continuously withdrawing purified polymeric material together with liquid (1), from the top section of the column, and liquid substantially free of polymeric material from the bottom section of the column. Liquid (1), may be the polymerization medium and it may contain the impure polymer as a dispersion, emulsion, or a solution. Before the polymer and liquid (1) is supplied to the base of the column, it may be treated with an alcohol such as water-free methanol, ethanol, isopropyl alcohol, or butanol, to which a small amount of an acid, or base, may be added. The liquid (2), may be water, water containing 96-70% by volume of methanol, or an alcohol thickened by a polar substance such as urea, sulphuric acid, sodium hydroxide, sodium acetate, acetic acid, ethylene glycol, or glycerol. A wetting agent may be present in liquids (1) or (2). The process may be carried out using two columns in series. In the examples the catalyst residues removed are of the Ziegler-type. The polymers purified may be homo- and copolymers of ethylene, propylene, 1-butene, isobutene, styrene, butadiene, isoprene, or chloroprene.