Title:
高純度4,4’-イソプロピリジン-ビス-(2,6ジブロモフェノール)組成物の製造方法
Document Type and Number:
Japanese Patent JP4410447
Kind Code:
B2
Abstract:
A high purity 4,4'-isopropylidine-bis-(2,6-dibromophenol) characterised by ionic bromides less than 10 ppm, colour in alkaline solution from 60-100 HU, HPLC purity about 99.9%, APHA of 20% MeOH solution less than 10.0 HU, Fe less than 1.0 ppm, turbidity of 20% MeOH solution less than 5 NTU, pH of 10% slurry 6.0-7.0, size of the crystal particles, 250 to 280 microns with angle of repose lower than 30°. The product is produced by reacting Bisphenol-A with bromine in a "water-immiscible" polar solvent in the presence of hydrogen peroxide, aging the reaction products after the reaction, eliminating the excess bromine by reducing agents, washing the product layer with a combination of anionic surfactant, alkali, reducing agent and demineralised water under controlled pH conditions, partially distilling the organic solvent chilling the medium containing the product, filtering the crude product, boiling the crude product with alkali, reducing agent and demineralised water, filtering the TBBA, washing the product with demineralised water and drying to obtain the final high purity TBBA with high yield.
Inventors:
Shantaram Narayan Naik
Dharma Ratnakar Lambda Naik
M Madhus Dan Rao
Dharma Ratnakar Lambda Naik
M Madhus Dan Rao
Application Number:
JP2001546620A
Publication Date:
February 03, 2010
Filing Date:
December 20, 1999
Export Citation:
Assignee:
Solaris Chemtech Industries Limited
International Classes:
C07C37/86; C07C37/62; C07C37/72; C07C37/74; C07C39/367; H05K1/03
Domestic Patent References:
| JP52089659A | ||||
| JP7033700A | ||||
| JP49054301A | ||||
| JP63316748A | ||||
| JP6032757A | ||||
| JP4334335A | ||||
| JP3193739A | ||||
| JP54055538A | ||||
| JP64003139A | ||||
| JP54119425A | ||||
| JP49110653A |
Attorney, Agent or Firm:
Patent Business Corporation Ark Patent Office