METHOD OF BY-PRODUCTS CONVERSION IN PROCESS OF SYNTHESIS OF BISPHENOL A Russian patent published in 2017 - IPC C07C39/16 C07C37/86 

FIELD: chemistry.

SUBSTANCE: present invention relates to the process for conversion of by-products during the synthesis of bisphenol A. The proposed method consists in the following: the solution of by-products and p, p'-BPA in phenol containing not more than 18% isomer p, p'-BPA, no more than 0.5% of water and not less than 0.15 mol of isomer o, p'-BPA per 1 mole of p, p'-BPA and at least 0.01 mol of trisphenols per 1 mol of p,p'-BPA, is contacted at a temperature of at least 60°C to 80°C as well as at volume and spatial flow rate of up to 2.0 m³/(m³k·hour) with macroporous sulfonion-exchange resin in the hydrogen form ion with a bimodal structure and the total volume of pores having a radius of not more than 20 nm in the resin is less than 0.5 ml/g, whereas the total volume of pores with a radius of 20 nm - 100 nm is greater than 0.8 ml/g.

EFFECT: invention allows to improve the conversion of by-products in the synthesis of bisphenol A aimed to isomer p,p'-BPA, and also aimed to limiting the number of obtained undesirable by-products.

5 cl, 2 tbl, 16 ex