The present invention relates to a single-pot method for preparing dialkyl carbonates, the method comprises reaction of alkylene oxide with aliphatic or cyclic aliphatic alcohol, using wood ash catalyst, under CO.sub.2 pressure and heating the reaction mixture thereof to obtain dialkyl carbonates.

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.

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.

The disclosure relates to the use of fluorinated ethers such as 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMOP) as a reaction solvent to prepare fluorinated dialkyl carbonate and sulfite compounds useful in batteries, and to electrolytes containing fluorinated compounds for use in batteries containing high Ni cathodes and silicon containing anodes.

The disclosure relates to the use of fluorinated ethers such as 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMOP) as a reaction solvent to prepare fluorinated dialkyl carbonate and sulfite compounds useful in batteries, and to electrolytes containing fluorinated compounds for use in batteries containing high Ni cathodes and silicon containing anodes.

The disclosure relates to the use of fluorinated ethers such as 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMOP) as a reaction solvent to prepare fluorinated dialkyl carbonate and sulfite compounds useful in batteries, and to electrolytes containing fluorinated compounds for use in batteries containing high Ni cathodes and silicon containing anodes.

The disclosure relates to the use of fluorinated ethers such as 1,1,1,3,3,3-hexafluoro-2-methoxypropane (HFMOP) as a reaction solvent to prepare fluorinated dialkyl carbonate and sulfite compounds useful in batteries, and to electrolytes containing fluorinated compounds for use in batteries containing high Ni cathodes and silicon containing anodes.

A fluorene-containing resin with a fluorene skeleton and an ester bond and/or a carbonate ester bond is depolymerized by a depolymerization method that includes allowing the fluorene-containing resin to react with a carbonate ester in the presence of a hydrolysis catalyst to decompose the fluorene-containing resin, obtaining a decomposition product. This depolymerization method allows simple or easy depolymerization of the fluorene-containing resin. The decomposition product may contain a monocarbonate ester form of a diol and/or a dicarbonate ester form of a diol. In the depolymerization method, the decomposition product may be allowed to react with an alcohol to obtain a diol.

A fluorene-containing resin with a fluorene skeleton and an ester bond and/or a carbonate ester bond is depolymerized by a depolymerization method that includes allowing the fluorene-containing resin to react with a carbonate ester in the presence of a hydrolysis catalyst to decompose the fluorene-containing resin, obtaining a decomposition product. This depolymerization method allows simple or easy depolymerization of the fluorene-containing resin. The decomposition product may contain a monocarbonate ester form of a diol and/or a dicarbonate ester form of a diol. In the depolymerization method, the decomposition product may be allowed to react with an alcohol to obtain a diol.

The method for industrially producing a dialkyl carbonate and a diol, in which the dialkyl carbonate and the diol are continuously produced through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, comprising the steps of: continuously feeding the starting materials into a continuous multi-stage distillation column in which a homogeneous catalyst is present; carrying out reaction and distillation simultaneously in the column; continuously withdrawing a low boiling point reaction mixture containing the produced dialkyl carbonate in a gaseous form from an upper portion of the column; and continuously withdrawing a high boiling point reaction mixture containing the diol in a liquid form from a lower portion of the column, where the method satisfies specific requirements.