The present invention relates to a method for preparing a carbonate. According to the method according to the present invention, it is possible to increase the DMC conversion rate and EMC selectivity in a transesterification reaction of DMC and EtOH.

The present invention relates to a method for preparing a carbonate. The method for preparing a carbonate of the present invention can effectively prepare high-purity EMC and DEC with a high DMC conversion rate. The method of the present invention can reduce energy costs and maintenance costs by reducing a load on a heat exchanger.

The present invention relates to a method for preparing a carbonate. The method for preparing a carbonate of the present invention can effectively prepare high-purity EMC and DEC with a high DMC conversion rate. The method of the present invention can reduce energy costs and maintenance costs by reducing a load on a heat exchanger.

The present disclosure provides a process for producing dimethyl carbonate with high conversion rate. Alkylene glycol reacts with urea via alcohylysis reaction to produce alkylene carbonate and ammonia. The alkylene carbonate produced reacts with methanol via transesterification reaction to produce dimethyl carbonate. Before the dimethyl carbonate is separated from the mixture, the nitrogen-containing impurities are substantially removed. Unreacted feedstock and catalysts are recycled in the process.

In an embodiment, a method for producing an aryl alkyl carbonate can comprise: reacting methanol with a dicarbonate in the presence of a catalyst to form a mixture comprising an aryl alkyl carbonate and a hydroxy compound, where methanol is in an acetone monomer mixture comprising acetone and at least one of diaryl carbonate and dihydroxy compound separating the aryl alkyl carbonate from the mixture.

In an embodiment, a method for producing an aryl alkyl carbonate can comprise: reacting methanol with a dicarbonate in the presence of a catalyst to form a mixture comprising an aryl alkyl carbonate and a hydroxy compound, where methanol is in an acetone monomer mixture comprising acetone and at least one of diaryl carbonate and dihydroxy compound separating the aryl alkyl carbonate from the mixture.

In an embodiment, a method for producing an aryl alkyl carbonate can comprise: reacting methanol with a dicarbonate in the presence of a catalyst to form a mixture comprising an aryl alkyl carbonate and a hydroxy compound, where methanol is in an acetone monomer mixture comprising acetone and at least one of diaryl carbonate and dihydroxy compound separating the aryl alkyl carbonate from the mixture.

The present disclosure provides a dialkyl carbonate prepared from a methyl branched primary C.sub.16-C.sub.17 alcohol. The dialkyl carbonate is prepared by transesterifying a reactant dialkyl carbonate with the methyl branched primary C.sub.16-C.sub.17 alcohol under transesterification reaction conditions. The subsequently produced dialkyl carbonate may be used in various applications, including, but not limited to, in lubricating, cosmetic and textile products and applications.

The present disclosure provides a dialkyl carbonate prepared from a methyl branched primary C.sub.16-C.sub.17 alcohol. The dialkyl carbonate is prepared by transesterifying a reactant dialkyl carbonate with the methyl branched primary C.sub.16-C.sub.17 alcohol under transesterification reaction conditions. The subsequently produced dialkyl carbonate may be used in various applications, including, but not limited to, in lubricating, cosmetic and textile products and applications.

Provided is a method for industrially producing high-purity diaryl carbonate, comprising: a first purification step of continuously introducing a mixture containing diaryl carbonate to a purifying column A having a side cut discharge port, and continuously separating by distillation the mixture into a column top component (At), a side cut component (As) containing diaryl carbonate, and a column bottom component (Ab) containing a catalyst; and a second purification step of continuously introducing the side cut component (As) to a diaryl carbonate purifying column B having a side cut discharge port, and continuously separating by distillation the component into three components, a column top component (Bt), a side cut component (Bs), and a column bottom component (Bb), thereby obtaining high-purity diaryl carbonate as the side cut component (Bs).