Reaktion #61204

Reaktionsgleichung

BPA

BPA

phenol

→

bisphenol A phenol

Lösungsmittel

water

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeseparating the adduct obtained in step (b)
2. 2
   Sonstigeby solid-liquid separation
3. 3
   Sonstigeto obtain a solid phase
4. 4
   Waschena liquid phase d) washing of the solid phase with a solution
5. 5
   workup.ADDITIONcontaining phenol
6. 6
   Sonstigeto obtain
7. 7
   Waschenwashed solid phase
8. 8
   workup.DISTILLATIONa second liquid phase, e) distilling the liquid phase
9. 9
   Sonstigeto obtain
10. 10
    workup.ADDITIONintroducing of at least 90% by weight of the dewatered solution into step (a)
11. 11
    Sonstigeto obtain a homogeneous material system that

Vorschrift

A process for the preparation of high purity bisphenol A is disclosed. The multi-step process entails a) reacting phenol with acetone in the presence of an acidic ion exchanger and a sulfur-containing co-catalyst to give a product mixture that includes bisphenol A and phenol; b) continuously obtaining from the product mixture crystals of bisphenol A-phenol adduct by suspension crystallization, c) separating the adduct obtained in step (b) by solid-liquid separation to obtain a solid phase and a liquid phase d) washing of the solid phase with a solution containing phenol to obtain washed solid phase and a second liquid phase, e) distilling the liquid phase and said second liquid phase to obtain dewatered solution containing 5 to 15% p,p-BPA, 3 to 12% isomers of BPA and less than 0.3% water, f) introducing of at least 90% by weight of the dewatered solution into step (a), g) adding phenol to the washed solid phase obtained in step d) to obtain a homogeneous material system that contains p,p′-BPA, isomers of BPA and water h) continuously obtaining from the homogeneous material system crystals of bisphenol A-phenol adduct by suspension crystallization; i) separating the crystals obtained in step (h) by solid-liquid separation to obtain a second solid phase, j) washing the second solid phase with a solution that contains phenol to obtain a washed adduct; and k) heating the washed adduct to remove phenol.

Quelle