continued from part 1 - Controller General of Patents, Designs, and ...

(12) PATENT APPLICATION PUBLICATION (21) Application No.6302/DELNP/2008 A
(19) INDIA
(22) Date of filing of Application :18/07/2008 (43) Publication Date : 24/10/2008
(54) Title of the invention : "PROCESS FOR PRODUCING BISPHENOL A"
(51) International classification :C07 37/20 (71)Name of Applicant :
(31) Priority Document No :2006-01638 1)MITSUBISHI CHEMICAL CORPORATION
(32) Priority Date :25/01/2006
Address of Applicant :14-1 SHIBA 4-CHOME MINATO-KU
(33) Name of priority country :Japan
TOKYO JAPAN. Japan
(86) International Application No :PCT/JP2007/000027 (72)Name of Inventor :
Filing Date
:24/01/2007
1)NAGAOKA, MICHIHIRO
(87) International Publication No :WO 2007/086239 2)TANAKA, TATSUO
(61) Patent of Addition to Application
Number
Filing Date
:NA
:NA
3)KIMURA, HIROAKI
4)HAYASHI, HIDETO
5)NAKAJIMA,IWAO
(62) Divisional to Application Number :NA
Filing Date
:NA
(57) Abstract :
There is provided a process for producing bisplenol (BPA) which includes steps of treating a part of a mother liquor obtained in the
process for production of bisphenol A to remove impurities therefrom and then feeding again the thus treated mother liquor to the
reaction system, which is capable of preventing a BPA production catalyst used therein from being deteriorated in catalytic activity.
The process for producing bisphenol A according to the present invention includes a reaction step of reacting acetone and phenol (PL)
to obtain a reaction mixture containing BPA and PL; a low-boiling component separation step of separating a BPA-containing
component from the reaction mixture; a BPA separation step of separating the BPA-containing component into a material flow
containing BPA as a main component and a mother liquor containing PL and reaction impurities as main components; a light
component separation step of subjecting at least a part of the mother liquor to heat treatment and distillation in the presence of an
alkali to separate the mother liquor into a light component and a heavy component; and a recombination reaction step of treating the
thus separated light component in the presence of a catalyst to allow PL and isopropenyl phenol contained in the light component to be
recombined with each other and converted into bisphenol A, in which a content of isopropyl phenol in a reactdoil out ionoit ined in the
reaction step is controlled to not more than 4% by weight.
No. of Pages : 55 No. of Claims : 9
The Patent Office Journal 24/10/2008 25810