Method for producing diphenylcarbonate having catalyst comprising ionic fluids
View Patent ↗The invention relates to a method for producing diphenylcarbonate while using a catalyst composition comprising ionic fluids.
1. A catalyst composition for preparing diphenyl carbonate which comprises an ionic liquid, wherein the ionic liquid is 1-butyl-3-methylpyrrolidinium trifluoroacetate, 1-butyl-3-methylimidazolium hexafluorophosphate or a mixture thereof and wherein the catalyst composition further comprises a palladium salt, a manganese salt and a base.
2. The catalyst composition as claimed in claim 1 , wherein the palladium salt is palladium bromide, palladium acetate or palladium chloride.
3. The catalyst composition as claimed in claim 1 , wherein the manganese salt is manganese(II) acetyl acetonate, manganese(III) acetyl acetonate, manganese(II) acetate, manganese(III) acetate or manganese bromide.
4. The catalyst composition as claimed in claim 1 , wherein the ionic liquid is 1-butyl-3-methylpyrrolidinium trifluoroacetate or 1-butyl-3-methylimidazolium hexafluorophosphate.
5. The catalyst composition as claimed in claim 1 having from 0.01 to 0.06% by weight of palladium salt, from 0.1 to 0.5% by weight of manganese salt and from 0.5 to 6% by weight of base in the ionic liquid.
6. A process for preparing diphenyl carbonate from a reaction mixture comprising phenol, carbon monoxide and also oxygen and optionally diphenyl carbonate in a reaction zone, wherein the reaction mixture in the reaction zone is passed through a catalyst composition containing an ionic liquid which is 1-butyl-3-methylpyrrolidinium trifluoroacetate or 1-butyl-3-methylimidazolium hexafluorophosphate or a mixture thereof, a palladium salt, a manganese salt and a base.
7. The process as claimed in claim 6 , carried out at a temperature of from 75 to 150° C.
8. The process as claimed in claim 6 , carried out at a pressure of from 3 to 80 bar.
9. The process of claim 6 , wherein the reaction mixture is passed through a separation zone after the reaction zone.
10. The process of claim 7 wherein said temperature is from 85 to 110° C.
11. The process of claim 8 , wherein said pressure is from 15 to 30 bar.