Production process and device for synthesizing bisphenol a by resin method

A production process for synthesizing bisphenol A by a resin method, including:

• feeding raw material acetone, recycled acetone and circulating phenol into the condensation reaction unit (100 #) for a reaction;
• refined fresh acetone being respectively fed into the first-stage reactor (102) and the second-stage reactor (112) by weight in proportion;
• mixing the acetone fed into the first-stage reactor (102) with the recycled phenol from a cracking feed preheater (601) and a material from a first-stage circulating pump (105), a mixture entering a first-stage cooler (101), and entering the first-stage reactors (102-104) after being cooled down by circulating water;
• one part of the reaction liquid flowing out of the first-stage reactor (104) circulating back to the first-stage reactor (102) through the first-stage circulating pump (105), and the remaining reaction liquid being heated by a dehydration flash preheater (106) and entering a dehydration flash tank (107) to remove part of water from the remaining reaction liquid;
• simple separating a product from an unreacted raw material mixture, feeding a reaction liquid into the first-stage adduct crystallization unit (200 #), and feeding aqueous phenol into the solvent recycling unit (500 #);
• introducing part of raw material phenol from the first-stage adduct crystallization unit for washing an upstream reaction liquid, recycled phenol from a dephenolization refining unit (300 #) and the adduct crystal molten solution from a mother solution recycling unit (400 #), after washing, feeding a first-stage centrifugal mother solution/washing solution and a second-stage centrifugal mother solution into the mother solution recycling unit, and feeding the adduct crystal molten solution into the dephenolization refining unit;
• feeding the aqueous phenol into the solvent recycling unit while yielding a final product BPA through the dephenolization refining unit;
• introducing part of raw material phenol from the mother solution recycling unit for washing the mother solution, the washing solution, the recycled phenol and the recycled BPA from the cracking and rearrangement unit (600 #), followed by feeding the second-stage centrifugal mother solution into the cracking and rearrangement unit;
• adding ethylbenzene to the solvent recycling unit to serve as an entrainer, and discharging effluent out of the system while feeding the recycled acetone into the condensation reaction unit and feeding the recycled phenol into the mother solution recycling unit;
• and receiving the second-stage centrifugal mother solution by the cracking and rearrangement unit to perform cracking and rearrangement, feeding the recycled BPA back to the mother solution recycling unit, and delivering p-isopropyl phenol and effluent out of the system.