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AssigneeSabic Innovative Plastics IP B.V.
InventorsAlfredo Lopez Carretero, David Domingo Fuster, Gerardo Hidalgo Llinas, Ignacio Vic Fernandez, Miguel Angel Salomon Cheliz
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A method of making polycarbonate comprises polymerizing, in a melt polymerization reaction, an aromatic dihydroxy compound and a diaryl carbonate in a presence of a polymerization catalyst and producing a by-product vapor stream comprising the dihydroxy compound, the diaryl carbonate and a diaryl carbonate by-product, adding a low vapor pressure compound to the by-product vapor stream to produce a modified by-product vapor stream, introducing the modified by-product vapor stream to a separation unit, removing the volatile diaryl carbonate by-product from the modified by-product vapor stream in the separation unit to form a treated by-product stream and returning the treated by-product stream to the polymerization reaction. Alternatively, the low vapor pressure compound can be added directly to the separation unit.
A method of making polycarbonate comprising polymerizing, in a melt polymerization reaction, an aromatic dihydroxy compound and a diaryl carbonate in a presence of a polymerization catalyst and producing a by-product vapor stream comprising the aromatic dihydroxy compound, the diaryl carbonate and a diaryl carbonate by-product, adding a low vapor pressure compound to the by-product vapor stream to produce a modified by-product vapor stream, introducing the modified by-product vapor stream to a separation unit, and removing the volatile diaryl carbonate by-product from the modified by-product vapor stream in the separation unit to form a treated by-product stream and returning the treated by-product stream to the melt polymerization reaction.
A method of making polycarbonate comprising polymerizing, in a melt polymerization reaction, an aromatic dihydroxy compound comprising hydroquinone and bisphenol A and diphenyl carbonate in a presence of a polymerization catalyst and producing a by-product vapor stream comprising hydroquinone, bisphenol A, diphenyl carbonate and phenol, adding a low vapor pressure compound to the by-product vapor stream to produce a modified by-product vapor stream, introducing the modified by-product vapor stream to a separation unit, removing the phenol from the modified by-product vapor stream in the separation unit to form a treated by-product stream and returning the treated by-product stream to the polymerization reaction.
A method of making polycarbonate comprising polymerizing, in a melt polymerization reaction, an aromatic dihydroxy compound and a diaryl carbonate in a presence of a polymerization catalyst and producing a by-product vapor stream comprising the aromatic dihydroxy compound, the diaryl carbonate and a diaryl carbonate by-product, adding a low vapor pressure compound to a separation unit, introducing the by-product vapor stream to the separation unit, and removing the volatile diaryl carbonate by-product from the by-product vapor stream in the separation unit to form a treated by-product stream and returning the treated by-product stream to the melt polymerization reaction.
A method of making polycarbonate comprising polymerizing, in a melt polymerization reaction, an aromatic dihydroxy compound comprising hydroquinone and bisphenol A and diphenyl carbonate in a presence of a polymerization catalyst and producing a by-product vapor stream comprising hydroquinone, bisphenol A, diphenyl carbonate and phenol, adding a low vapor pressure compound to a separation unit, introducing the by-product vapor stream to the separation unit, removing the phenol from the by-product vapor stream in the separation unit to form a treated by-product stream and returning the treated by-product stream to the polymerization reaction.
Dependencies are inferred from the claim text.