Examples of 'diaryl carbonate' in a sentence
Meaning of "diaryl carbonate"
diaryl carbonate: A chemical term referring to a compound containing two aryl groups bonded to a carbonate group
How to use "diaryl carbonate" in a sentence
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diaryl carbonate
The recovered diaryl carbonate is optionally refined.
Process for the preparation of diaryl carbonate.
The diaryl carbonate is favorably employable for producing a polycarbonate.
Process for preparing a diaryl carbonate.
The collected diaryl carbonate has a high degree of purity.
Process for producing diaryl carbonate.
Either one diaryl carbonate or different diaryl carbonates can be used.
The end product preferably comprises mostly diaryl carbonate.
It is possible to use either one diaryl carbonate or various diaryl carbonates.
A method for making polycarbonate substantially free of diaryl carbonate.
Diaryl carbonate esters are known as materials for polycarbonates produced by melt process.
Preparation of diaryl carbonate.
Sufficient amounts of catalyst and of monophenol are present in this diaryl carbonate.
The diaryl carbonate formed is taken off from the bubble column.
The monophenol can be reused for the preparation of the diaryl carbonate.
See also
The diaryl carbonate is then separated from the reaction product and purified.
The phosgene can be reused in the preparation of the diaryl carbonate in step b.
Process for the purification of diaryl carbonate and process for the production of polycarbonate.
Said stream may be subjected to further distillation to obtain pure diaryl carbonate.
The diaryl carbonate functions to control molecular weight and serves as an efficient endcapping agent.
The combination of such procedures are favorably employed for obtaining a diaryl carbonate of high purity.
The diaryl carbonate formation reaction depicted in Fig.
Therefore preferably the aryl alcohol is phenol and the diaryl carbonate is diphenyl carbonate.
Preferably, the diaryl carbonate is unsubstituted diphenyl carbonate.
The bottom fraction generally comprises the aromatic alcohol and the diaryl carbonate.
Optionally, a diaryl carbonate may be added to the polycarbonate to be redistributed.
The bottom stream from the third reactive distillation column comprises the desired diaryl carbonate.
A process for producing a diaryl carbonate comprising the steps of,.
In this case, diphenyl carbonate is preferably used as a diaryl carbonate ester.
Therefore, the diaryl carbonate per se is not easy to industrially produce or obtain.
The process of claim 1 wherein the diaryl carbonate is diphenyl carbonate.
Here, monophenols in particular are very readily soluble in the diaryl carbonate.
Optionally, a diaryl carbonate may be added to the starting polycarbonate composition to be redistributed.
A method in accordance with claim 1, where the diaryl carbonate is diphenyl carbonate.
Optionally, a diaryl carbonate may be added to the starting polyestercarbonate composition to be redistributed.
Also, other various methods have been proposed to produce the diaryl carbonate.
Reacting a diaryl carbonate with a bisphenol to produce a bisphenol polycarbonate and a phenol ;.
A method in accordance with claim 1, wherein said mixture further comprises a diaryl carbonate.
The diaryl carbonate used in the present invention is represented by the following formula,.
More particularly, it relates to the improvement of diaryl carbonate yield in the carbonylation reaction.
The diaryl carbonate is recovered, removing the gaseous carbon monoxide, and purified.
Also, the collection and refining of the resultant diaryl carbonate can be effected easily.
Preferably, said diaryl carbonate is diphenyl carbonate and said aryl alcohol is phenol.
In such processes, the dialkyl carbonate is converted into diaryl carbonate vía the following steps.
Examples of the diaryl carbonate include, without any particular limitation, diphenyl carbonate.
Especially preferred is diphenyl carbonate, which is the diaryl carbonate having the simplest structure.
Providing a crude solution of diaryl carbonate in admixture with contaminant by-products of a diaryl carbonate preparation ;.
The organic carbonate can be a dialkyl carbonate, a dialkylene carbonate, a cycloalkylene carbonate or a diaryl carbonate.
However, a pure distilled diaryl carbonate is preferably used for the HCl scrubbing stage.
Illustrative examples of such precursors include carbonyl halides, diaryl carbonate esters and haloformates.
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