Comparison of polycarbonate precursors synthesized …

T1 - Melt polymerization of bisphenol-A and diphenyl carbonate in a semibatch reactor

The diphenyl carbonate was derived in part from ..

N2 - The effect of thermodynamic phase equilibrium on the kinetics of semi-batch melt polycondensation of bisphenol-A and diphenyl carbonate was studied for the synthesis of polycarbonate. In the melt-polymerization process, a partial loss of diphenyl carbonate occurs as the reaction by-product phenol is removed from the reactor. To obtain a high molecular weight polymer under high temperature and low-pressure conditions, a stoichiometric mol ratio of the two reactive end groups needs to be maintained during the polymerization. In this work, vapor - liquid equilibrium data for a binary mixture of phenol and diphenyl carbonate are reported and they are used in conjunction with the Wilson equation to calculate the exact amounts of diphenyl carbonate and phenol returned from a reflux column to the reactor. A good agreement between the reactor model simulations and the experimental polymerization data was obtained. It was also observed that diphenyl carbonate is quickly consumed during the early stage of polymerization and the fraction of evaporated diphenyl carbonate refluxed to the reactor is essentially constant during this period.

A., "Reaction from Dimethyl Carbonate (DMC) to Diphenyl Carbonate (DPC).

Modelling polycarbonate synthesis rates on the …

calculated value1 Introduction Diphenyl carbonate (DPC) is used to produce many organic compounds and polymer materials, particularly polycarbonate without using phosgene [1] .

AB - The effect of thermodynamic phase equilibrium on the kinetics of semi-batch melt polycondensation of bisphenol-A and diphenyl carbonate was studied for the synthesis of polycarbonate. In the melt-polymerization process, a partial loss of diphenyl carbonate occurs as the reaction by-product phenol is removed from the reactor. To obtain a high molecular weight polymer under high temperature and low-pressure conditions, a stoichiometric mol ratio of the two reactive end groups needs to be maintained during the polymerization. In this work, vapor - liquid equilibrium data for a binary mixture of phenol and diphenyl carbonate are reported and they are used in conjunction with the Wilson equation to calculate the exact amounts of diphenyl carbonate and phenol returned from a reflux column to the reactor. A good agreement between the reactor model simulations and the experimental polymerization data was obtained. It was also observed that diphenyl carbonate is quickly consumed during the early stage of polymerization and the fraction of evaporated diphenyl carbonate refluxed to the reactor is essentially constant during this period.


Pd catalyzed polycarbonate synthesis from ..

However, an increasing proportion of polycarbonates is made via diphenyl carbonate, in order to eliminate the use of carbonyl chloride, an extremely poisonous gas.

led to the synthesis of polycarbonate of M w 3600 but the ..

(Tokyo, Japan; ) will construct a validation plant at its Mizushima Works facility (Kurashiki, Okayama, Japan) for its newly developed process to produce diphenyl carbonate (DPC), a monomer used in polycarbonate (PC) production, via dialkyl carbonate (DRC).

Asahi Kasei Chemicals has built a successful business globally licensing its non-phosgene process for PC using CO2 as feedstock.

Diphenyl-carbonate - General, Suppliers, Product, …

New catalyst systems for the direct synthesis of diphenyl carbonate (DPC) from carbon monoxide (CO) and phenol were investigated. Palladium-tin complexes [Pd2(dPPm)2(SnCl3) Cl and Pd2(dppm)2(SnCl3)2, dppm : bis (diphenylphospino) methane] with manganese redox catalyst [Mn(TMHD)3, TMHD : 2, 2, 6, 6-tetramethyl-3, 5-heptanedionate] were found to produce DPC effectively without any addition of ammonium halide. Furthermore, palladium catalyst systems such as, palladium dinuclear complexes, palladium-diimine complexes, and palladium-6, 6'-disubstituted-2, 2'-bipyridyl complexes promoted the oxidative carbonylation of phenol more effectively in the presence of ammonium halide. Especially, the efficiencies of Pd2(Ph2PPY)2(NO2)2(Ph2PPy : 2-pyridyldiphenylphosphine) and Pd(6, 6'-Me2bpy)Cl2(6, 6'-Me2bpy : 6, 6'-dimethyl-2, 2'-bipyridyl) were highest among these palladium complexes. These palladium catalyst systems were applied for the direct synthesis of polycarbonate (PC) from bisphenol A and CO. PC with the number-and weight-average molecular weights of 5600 and 12900 respectively, was successfully obtained using Pd (6, 6'-Me2bpy) Cl2 catalyst system. These molecular weights were highest among the direct syntheses of PC by oxidative carbonylation.

Polycarbonate synthesis by melt phase carbonate-ester ..

Diphenyl carbonate is produced from dimethyl carbonate, which is often made from methanol, oxygen and carbon monoxide in the liquid phase in the presence of a copper salt such as copper(II) chloride:

Synthesis of polycarbonate diol catalyzed by metal …

On the other hand, diphenyl carbonate is produced from dimethyl carbonate, which is readily manufactured from methanol, carbon monoxide and oxygen in the liquid phase, in presence of copper(II) chloride, CuCl2: