Provided herein is a method of preparing a heterogeneous linear carbonate, including: performing a transesterification reaction of dimethyl carbonate (DMC) and ethanol (EtOH) in the presence of a catalyst; and filtering a composite obtained by the transesterification reaction through a filter.

Provided herein is a method of preparing a heterogeneous linear carbonate, including: performing a transesterification reaction of dimethyl carbonate (DMC) and ethanol (EtOH) in the presence of a catalyst; and filtering a composite obtained by the transesterification reaction through a filter.

A method for separating dimethyl carbonate from methanol includes subjecting a raw material containing dimethyl carbonate and methanol to extractive distillation. The extractant contains an ionic liquid and a compound having a general formula of CH.sub.3O(CH.sub.2CH.sub.2O).sub.nCH.sub.3, n being an integer of 2-8. The ionic liquid is an imidazole ionic liquid, a pyridine ionic liquid, or a mixture thereof.

A method for separating dimethyl carbonate from methanol includes subjecting a raw material containing dimethyl carbonate and methanol to extractive distillation. The extractant contains an ionic liquid and a compound having a general formula of CH.sub.3O(CH.sub.2CH.sub.2O).sub.nCH.sub.3, n being an integer of 2-8. The ionic liquid is an imidazole ionic liquid, a pyridine ionic liquid, or a mixture thereof.

A method for separating dimethyl carbonate from methanol includes subjecting a raw material containing dimethyl carbonate and methanol to extractive distillation. The extractant contains an ionic liquid and a compound having a general formula of CH.sub.3O(CH.sub.2CH.sub.2O).sub.nCH.sub.3, n being an integer of 2-8. The ionic liquid is an imidazole ionic liquid, a pyridine ionic liquid, or a mixture thereof.

The invention relates to aluminium vessels containing dicarbonic diesters and to a method for producing the packaged dicarbonic diesters.

The invention relates to aluminium vessels containing dicarbonic diesters and to a method for producing the packaged dicarbonic diesters.

The present invention relates to a method for producing fluorine-containing dialkyl carbonate compounds, which are suitable as non-aqueous solvents for non-aqueous electrolytes used in secondary batteries. When an alkyl chloroformate and an alcohol are reacted in the presence of an ether-containing imidazole derivative base, the reaction can be carried out at room temperature as compared with the prior art, and the products can be separated within a short time from the reactants. This is an economical process, and according to the present invention, it is possible to obtain alkyl carbonates containing fluorine atoms simply and without difficulty in the removal of solvents, salts formed during the reaction, and by-products. Accordingly, the production method of the present invention can be effectively applied to the production of fluorine-containing dialkyl carbonates used for various applications such as electrolytes of lithium ion secondary batteries, medicines and fine chemicals, pesticides, polar aprotic solvents, synthetic lubricating oils and the like.

The present invention relates to a method for producing fluorine-containing dialkyl carbonate compounds, which are suitable as non-aqueous solvents for non-aqueous electrolytes used in secondary batteries. When an alkyl chloroformate and an alcohol are reacted in the presence of an ether-containing imidazole derivative base, the reaction can be carried out at room temperature as compared with the prior art, and the products can be separated within a short time from the reactants. This is an economical process, and according to the present invention, it is possible to obtain alkyl carbonates containing fluorine atoms simply and without difficulty in the removal of solvents, salts formed during the reaction, and by-products. Accordingly, the production method of the present invention can be effectively applied to the production of fluorine-containing dialkyl carbonates used for various applications such as electrolytes of lithium ion secondary batteries, medicines and fine chemicals, pesticides, polar aprotic solvents, synthetic lubricating oils and the like.

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.