A method for recovering raw and auxiliary materials in the production of lithium bis(fluorosulfonyl)imide is described. The method includes one or more different recovery sections A, B, C, D and/or E, corresponding to the recovery and post-treatment of the raw and auxiliary materials such as triethylamine, a fluoride ion, an ester solvent, and a crystallization liquid respectively used in the production of lithium bis(fluorosulfonyl)imide. The method for recovering raw and auxiliary materials of the present application enables the production of lithium bis(fluorosulfonyl)imide to have significantly improved economic efficiency and environmental protection.

A diaryl carbonate containing a compound of the following formula (I) in an amount of less than 1,000 ppm by mass, and a method for producing the same:

##STR00001##

wherein R.sup.1 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aryloxy group.

A diaryl carbonate containing a compound of the following formula (I) in an amount of less than 1,000 ppm by mass, and a method for producing the same:

##STR00001##

wherein R.sup.1 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aryloxy group.

A diaryl carbonate containing a compound of the following formula (I) in an amount of less than 1,000 ppm by mass, and a method for producing the same:

##STR00001##

wherein R.sup.1 represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aryl group, or an aryloxy group.

A method of producing a diaryl carbonate, comprising: performing both a transesterification reaction and a disproportionation reaction within a reactive distillation column by introducing a feed stream comprising a dialkyl carbonate to the reactive distillation column at a point above a reboiler, and introducing an aromatic hydroxyl compound to the reactive distillation column; producing a diaryl carbonate, within the reactive distillation column; and withdrawing a bottom product stream comprising the diaryl carbonate from the reactive distillation column, preferably the diaryl carbonate has a purity of greater than or equal to 99.97 wt %.

A method of producing a diaryl carbonate, comprising: performing both a transesterification reaction and a disproportionation reaction within a reactive distillation column by introducing a feed stream comprising a dialkyl carbonate to the reactive distillation column at a point above a reboiler, and introducing an aromatic hydroxyl compound to the reactive distillation column; producing a diaryl carbonate, within the reactive distillation column; and withdrawing a bottom product stream comprising the diaryl carbonate from the reactive distillation column, preferably the diaryl carbonate has a purity of greater than or equal to 99.97 wt %.

The present disclosure discloses an energy-saving method for preparing electronic-grade carbonate, including the following steps that: industrial-grade dimethyl carbonate and anhydrous ethanol enter a reaction process after being preheated by a preheater, and are subjected to an esterification reaction under the action of a catalyst to obtain a mixture containing dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate, and an azeotrope of dimethyl carbonate and methanol; the above-mentioned mixture enters a recovery process of dimethyl carbonate to recover unreacted dimethyl carbonate; a mixture of ethyl methyl carbonate and diethyl carbonate then enters a crude separation process to obtain crude ethyl methyl carbonate and crude diethyl carbonate; and the crude ethyl methyl carbonate is subjected to a refining process of ethyl methyl carbonate to obtain electronic-grade ethyl methyl carbonate, and the crude diethyl carbonate is subjected to a refining process of diethyl carbonate to obtain electronic-grade diethyl carbonate.

The present disclosure discloses an energy-saving method for preparing electronic-grade carbonate, including the following steps that: industrial-grade dimethyl carbonate and anhydrous ethanol enter a reaction process after being preheated by a preheater, and are subjected to an esterification reaction under the action of a catalyst to obtain a mixture containing dimethyl carbonate, ethyl methyl carbonate and diethyl carbonate, and an azeotrope of dimethyl carbonate and methanol; the above-mentioned mixture enters a recovery process of dimethyl carbonate to recover unreacted dimethyl carbonate; a mixture of ethyl methyl carbonate and diethyl carbonate then enters a crude separation process to obtain crude ethyl methyl carbonate and crude diethyl carbonate; and the crude ethyl methyl carbonate is subjected to a refining process of ethyl methyl carbonate to obtain electronic-grade ethyl methyl carbonate, and the crude diethyl carbonate is subjected to a refining process of diethyl carbonate to obtain electronic-grade diethyl carbonate.

The present invention addresses to a process for producing olefins and esters in the C10 to C13 range from fatty acid esters through a catalytic hydrogenation reaction followed by cross-metathesis of the hydrogenated product with light olefins.

The present invention addresses to a process for producing olefins and esters in the C10 to C13 range from fatty acid esters through a catalytic hydrogenation reaction followed by cross-metathesis of the hydrogenated product with light olefins.