US 12,215,188 B2
Process for the preparation of polycarbonates from waste plastic feedstocks
Anthoni Wouter Zijl Van, Eindhoven (NL); Nicolas Goyheneix, Reimst (BE); Lara Maria Galan-Sanchez, Eindhoven (NL); Christoph Roosen, Würselen (DE); Johan Pastwa, Elsloo (NL); and Safa Farajzadeh Bibalan, Eindhoven (NL)
Assigned to SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
Appl. No. 18/017,265
Filed by SABIC Global Technologies B.V., Bergen op Zoom (NL)
PCT Filed Jul. 15, 2021, PCT No. PCT/EP2021/069692
§ 371(c)(1), (2) Date Jan. 20, 2023,
PCT Pub. No. WO2022/017894, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 20186670 (EP), filed on Jul. 20, 2020.
Prior Publication US 2023/0279179 A1, Sep. 7, 2023
Int. Cl. C08G 64/02 (2006.01); C10B 53/07 (2006.01); C10G 55/04 (2006.01)
CPC C08G 64/0233 (2013.01) [C10B 53/07 (2013.01); C10G 55/04 (2013.01); C10G 2300/1003 (2013.01); C10G 2300/1037 (2013.01)] 12 Claims
 
1. Process for the production of polycarbonates from waste plastics feedstocks comprising the steps in this order of:
(a) providing a hydrocarbon stream A obtained by hydrotreatment of a pyrolysis oil produced from a waste plastics feedstock;
(b) optionally providing a hydrocarbon stream B;
(c) supplying a feed C comprising a fraction of the hydrocarbon stream A and optionally a fraction of the hydrocarbon stream B to a thermal cracker furnace comprising cracking coil(s);
(d) performing a thermal cracking operation in the presence of steam to obtain a cracked hydrocarbon stream D;
(e) supplying the cracked hydrocarbon stream D to a separation unit;
(f) performing a separation operation in the separation unit to obtain a product stream E comprising propylene and a product stream F comprising benzene;
(g) supplying the product stream E and the product stream F to a reactor and performing a reaction and one or more separation step to obtain a product stream G comprising phenol;
(h) supplying the product stream G and acetone to a reactor and performing a reaction and one or more separation step to obtain a product stream H comprising bisphenol-A; and
(i) supplying the product stream H with phosgene or diphenyl carbonate to a reactor and performing a polymerisation reaction to obtain a polycarbonate,
wherein in step (d):
the coil outlet temperature is ≥800 and ≤850° C.; and
the weight ratio of steam to feed C is >0.3 and <0.8.