Title:
【発明の名称】2,6-NDA製造の一貫生産工程におけるカリウムの削減法
Document Type and Number:
Japanese Patent JP2003508373
Kind Code:
A
Abstract:
Disclosed is a method for reducing alkali metals in aromatic dicarboxylic acids produced by disproportionation or rearrangement of an alkali salt of a mono- or dicarboxylic acid to levels acceptable for polymerization which comprises: a) Washing the aromatic dicarboxylic acid with water in a ratio of about 4-8:1 water to acid at a temperature of about 70 - 200 DEG C; b) Introducing the aromatic dicarboxylic acid in water into a reactor characterized by minimal backmixing and reacting the aromatic dicarboxylic acid in water in said reactor at a temperature of about 100 - 200 DEG C; c) Directing the aromatic dicarboxylic acid in water exiting said reactor to a centrifuge to separate the solid aromatic dicarboxylic acid from water containing contaminants; d) Optionally, combining the solid aromatic dicarboxylic acid again with water in a ratio of about 5:1 at a temperature of about 100 - 200 DEG C to further reduce levels of alkali metals.
Inventors:
Blackbone, robert ell
Jun, Raymond El
Jun, Raymond El
Application Number:
JP2001519653A
Publication Date:
March 04, 2003
Filing Date:
August 08, 2000
Export Citation:
Assignee:
Mossi and Guisolfi Overseas Society of Anonymous
International Classes:
B01J27/232; C07C51/02; C07C51/15; C07C51/265; C07C51/353; C07C51/41; C07C51/42; C07C51/43; C07C51/47; C07C51/487; C07C63/38; C08G63/189; (IPC1-7): C07C51/47; C07C51/353; C07C63/38
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)