System and method of producing Bisphenol-A (BPA) using direct crystallization of BPA in a single crystallization stage
First Claim
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1. A system for producing Bisphenol-A, comprising:
- a reactor unit wherein a product stream is produced including at least Bisphenol-A and Phenol;
a mixer/separator unit, said mixer/separator unit being configured to selectively add solvent to the product stream wherein the composition of the product stream exhibits a phase equilibrium relationship such that Bisphenol-A crystals are formed during crystallization; and
a BPA crystallizer stage, the crystallizer stage receiving the product stream and wherein substantially pure Bisphenol-A crystals are produced directly upon crystallization in the BPA crystallizer stage, without prior adduct crystallization.
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Abstract
A system and method are provided for producing Bisphenol-A (BPA) using direct crystallization of BPA in a single crystallization stage. In one embodiment the method comprises reacting Phenol and Acetone in the presence of a catalyst to form a product solution including Bisphenol-A and Phenol; removing a part of the Phenol from the product solution if required, and providing a selective amount of solvent, so as to obtain a product solution with the desired phase equilibrium behavior; and feeding the product solution with a selective composition to a crystallization stage operated at a selected temperature, so as to recover substantially pure Bisphenol-A in crystal form.
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Citations
11 Claims
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1. A system for producing Bisphenol-A, comprising:
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a reactor unit wherein a product stream is produced including at least Bisphenol-A and Phenol; a mixer/separator unit, said mixer/separator unit being configured to selectively add solvent to the product stream wherein the composition of the product stream exhibits a phase equilibrium relationship such that Bisphenol-A crystals are formed during crystallization; and a BPA crystallizer stage, the crystallizer stage receiving the product stream and wherein substantially pure Bisphenol-A crystals are produced directly upon crystallization in the BPA crystallizer stage, without prior adduct crystallization. - View Dependent Claims (2, 3, 4, 5)
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6. A system for producing Bisphenol-A, comprising:
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a reactor unit wherein a product stream is produced including at least Bisphenol-A and Phenol; a partial phenol removal unit; a mixer/separator unit, the mixer/separator unit receiving the product stream from the reactor unit or the partial phenol removal unit and being configured to selectively adjust the composition of the product stream by mixing with one or more recycle streams; and a BPA crystallizer stage, the crystallizer stage receiving the product stream from the mixer/separator unit and whereupon crystallization substantially pure Bisphenol-A crystals are produced directly upon crystallization in the BPA crystallizer stage, without prior adduct crystallization. - View Dependent Claims (7, 8, 9, 10)
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11. A system for producing Bisphenol-A, comprising:
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a reactor unit wherein a product stream is produced including at least Bisphenol-A and Phenol; a partial phenol removal unit; a mixer/separator unit, the mixer/separator unit receiving the product stream from the reactor unit or the partial phenol removal unit and being configured to selectively adjust the composition of the product stream by mixing with one or more recycle streams; a solvent recovery unit, the solvent recovery unit recovering solvent used in the system and being coupled to at least one, or more of, the partial phenol removal unit or the mixer/separator to selectively adjust the composition of the product stream; and a BPA crystallizer stage, the crystallizer stage receiving the product stream and whereupon crystallization substantially pure Bisphenol-A crystals are produced directly upon crystallization in the BPA crystallizer stage, without prior adduct crystallization.
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Specification