Title:
HYDROGENATED NITRILE RUBBER WITH REDUCED CATALYST IMPURITY
Document Type and Number:
Japanese Patent JP2022107531
Kind Code:
A
Abstract:
To recover a residual catalyst from a hydrogenated nitrile rubber solution.SOLUTION: The residual hydrogenation catalyst from the hydrogenated nitrile rubber solution is recovered by using two steps such as (1) the catalyst extraction step with an ammonium salt and water (optionally including an oxidation step) to extract catalyst from the HNBR polymer chain to the solvent and then (2) the separation/column recovery step with the column packed with functional ion exchange resins for the separation of ammonia-catalyst complex from hydrogenated nitrile rubber solution and the column recovery for the high catalyst recovery with functional groups of resins. The ammonium salt for the catalyst extraction step is selected from ammonium chloride, ammonium bromide, ammonium iodide, and ammonium acetate. The functional groups in the functional ion exchange resins for packing the column is selected from thiourea, thiouronium, thiol, amine, diamine, triamine, TMT, dithiocarbamate, and carbodithioate.SELECTED DRAWING: Figure 1
Inventors:
CHOI SOOBUM
LAWRENCE J JUSTICE
MAHESH DATLA
LAWRENCE J JUSTICE
MAHESH DATLA
Application Number:
JP2022001584A
Publication Date:
July 21, 2022
Filing Date:
January 07, 2022
Export Citation:
Assignee:
ZEON CHEMICALS LP
International Classes:
C08F6/08
Attorney, Agent or Firm:
Hiroshi Oshino
Yutaka Nagata
Yutaka Nagata