Process for the on-line grafting of carboxylic acid and carboxyl

Details Process for the on-line grafting of carboxylic acid and carboxyl Process for the on-line grafting of carboxylic acid and carboxyl

1995-06-07

1997-01-07

Wu, David W.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Organic polymerization

422133, C08F25502

Patent

active

055914101

ABSTRACT:
(I) The (co)polymerisation of ethylene is carried out in at least one reaction zone (R) under high pressure, at 150.degree.-320.degree. C.; (II) the reaction product is routed into a zone (S), under an intermediate pressure P, for separation of the (co)polymer, in the molten state, from the unreacted (co)monomer(s), or the reaction product is routed into a first separation zone (S1), under an intermediate pressure (P1); the (co)polymer issuing from (S1) is then routed into a second separation zone (S2), under a pressure P2<P1; (III) the (co)polymer is routed into a zone (SF), under low pressure, for final separation of the (co)polymer from the residual gases. Let-down zones (D), (D1) and (D2) are provided along the path of the (co)polymer between the zones (S) and (SF), (S1) and (S2), and (S2) and (SF) respectively, the grafting monomer or monomers being introduced on-line, in the path of the (co)polymer, at at least one point located at the level of the zone (D) or at at least one zone (D1, D2). A grafting initiator may be introduced on-line at the same time as the grafting monomer(s) flow, or separately.

REFERENCES:
patent: 3928497 (1975-12-01), Ohmori et al.
patent: 4342853 (1982-08-01), Durand et al.
patent: 4612155 (1986-09-01), Wong et al.
patent: 4650841 (1987-03-01), Levresse
patent: 4762882 (1988-08-01), Okano et al.
patent: 4788264 (1988-11-01), Ukita
patent: 4804725 (1989-02-01), Kanne et al.

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