| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for producing high-purity bisphenol A (BPA). <P>SOLUTION: This method for producing the high-purity bisphenol A includes processes (a) to (k) as follows: (a) reacting phenol with acetone in the presence of an acidic ion exchanger and a sulfur-containing cocatalyst, so as to obtain a product mixture; (b) continuously obtaining crystals of a BPA-phenol adduct from the product mixture; (c) separating the adduct obtained in the process (b), so as to obtain a solid phase and a liquid phase; (d) washing the solid phase, so as to obtain a washed solid phase and a second liquid phase; (e) distilling the liquid phase and the second liquid phase, so as to obtain a dehydrated solution; (f) introducing at least 90 wt% of the dehydrated solution into the process (a); (g) adding the phenol to the washed solid phase obtained in the process (d), so as to obtain a homogeneous substance system; (h) continuously obtaining the crystals of the BPA-phenol adduct from the homogeneous substance system; (i) separating the crystals obtained in the process (h), so as to obtain a second solid phase; (j) washing the second solid phase, so as to obtain a washed adduct; and (k) heating the washed adduct, so as to remove the phenol. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
