Title:
REDUCTION OF IRON CONTENT IN DIPHENYLMETHANEDIISOCYANAGTE OR DIPHENYLMETHANE-BASED POLYISOCYANATE MIXTURE
Document Type and Number:
Japanese Patent JPH0899946
Kind Code:
A
Abstract:
To provide a method for regulating a metal content, especially iron content in diphenylmethanediisocyanate or a diphenylmethanediisocyanate-based polyisocynate mixture.
This method for reducing an iron content in diphenylmethanediisocyanate or a diphenylmethanediisocyanate based polyisocyanate mixture to a weight range of 0.1-100 mg-Fe per 1 kg isocyanate comprises treating the diphenylmethanediisocyanate or the diphenylmethanediisocyanate-based polyisocyanate mixture with one or more microporous adsorbents having at least 100 m2/g inner surface area at 20-200°C under 0.5-100 bar pressure, and separating the diphenylmethanediisocyanate or the diphenylmethanediisocyanate-based polyisocyanate mixture from the microporous adsorbents.
Inventors:
HAINTSUUHERUBERUTO MIYURAA
ROOTARU PUTSUPE
ETSUKARUTO BUARUDAU
ROOTARU PUTSUPE
ETSUKARUTO BUARUDAU
Application Number:
JP26198195A
Publication Date:
April 16, 1996
Filing Date:
September 18, 1995
Export Citation:
Assignee:
BAYER AG
International Classes:
B01J20/20; C07C263/14; C07C263/18; C07C263/20; C07C265/14; C08G18/70; C08G18/76; (IPC1-7): C07C265/14; B01J20/20; C07C263/18
Attorney, Agent or Firm:
Kazuho Kawarada (1 person outside)