Reference

Manufacture of bisphenol A with high purity and no color

Manufacture of bisphenol A with high purity and no color. Sakatani, Takashi; Kataoka, Mitsugi; Takeuchi, Takeshi; Hayashi, Koichi (Mitsubishi Chem Corp, Japan). Jpn. Kokai Tokkyo Koho JP 08319248 A2 3 Dec 1996 Heisei, 7 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: ICM: C07C039-16. 60-23-1 and 19351-18-9 which are cas registry numbers are also used here. ICS: B01J031-10; C07C037-20; C07B061-00. APPLICATION: JP 1995-124117 23 May 1995. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 25, 67 Bisphenol A is manufd. by condensation of PhOH with Me2CO in the presence of strongly acidic ion-exchange resin catalysts which are partly neutralized with mercaptoamines R2N(CH2)aCHR1(CH2)bSH (R1 = H, C1-6 alkyl; R = H, C1-10 alkyl, C4-5 cyclic alkylenes which are bonded at w terminals; a, b = 0-4; a + b = 1, 4) or 2,2-dimethylthiazolidine, and then treating the mixt. with free acid-type strongly acidic ion-exchange resins. Thus, a 10/1 PhOH/Me2CO mixt. was passed through a column packed with Diaion SK-104H (SO3H-type ion-exchange resin) (I) which was 20%-neutralized with 2-mercaptoethylamine, and then a column packed with free acidic I at 70° to give bisphenol A with APHA color index 40 after 5 h at 200°. .

Two-stage procedure for the manufacture of bisphenol A

Two-stage procedure for the manufacture of bisphenol A. Kiedik, Maciej; Grzywa, Edward; Kolt, Jozef; Rzodeczko, Anna; Zajac, Eugeniusz; Mroz, Jerzy; Kosciuk, Ryszard; Smolnik, Ryszard; Swiderski, Zbigniew; Koterba, Marek (Petro Carbo Chem S.A.; Instytut Ciezkiej Syntezy Organicznej BLACHOWNIA, Pol. 19351-18-9 and 80-05-7 are also occured in this study.). Pol. PL 183597 B1 28 Jun 2002, 10 pp. (Polish). (Poland). CODEN: POXXA7. CLASS: ICM: C07C039-16. ICS: C07C037-20. APPLICATION: PL 1997-318613 20 Feb 1997. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 25 In the manuf. of bisphenol A by condensation of PhOH with Me2CO in the presence of strongly acidic cation exchange resin catalyst the reaction is carried out in 2 stages. In the 1st stage a cation exchanger (Amberlyst 31) modified with a mercaptoamine, e.g., 2,2-dimethylthiazolidine promoter is used as condensation catalyst in order to limit the quantity of byproducts to <5%, while in the 2nd stage unmodified Amberlyst 31 is used and the quantity of byproducts is <20%. The resulting reaction mixt. is crystd., the cryst. PhOH/bisphenol A adduct is washed with PhOH, the bisphenol A is recovered by removing PhOH by distn. and the PhOH-contg. mother liquor is recycled in order to recover PhOH and Me2CO. .