Method for preparing a dialkyl carbonate of dianhydrohexitol

A kind of technology of dianhydrohexitol and dialkyl carbonate, applied in the field of dialkyl carbonate for preparing dianhydrohexitol

Active Publication Date: 2012-02-29
ROQUETTE FRERES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this preparation method here again involves the toxic chloroform entity

Method used

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  • Method for preparing a dialkyl carbonate of dianhydrohexitol
  • Method for preparing a dialkyl carbonate of dianhydrohexitol
  • Method for preparing a dialkyl carbonate of dianhydrohexitol

Examples

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example 1

[0077] Example 1: Preparation of isosorbide bis(methyl carbonate) according to the invention

[0078]43 g of isosorbide (0.29 mol), then 1069 g of dimethyl carbonate (relative to isosorbide, = 40 molar equivalents) and 123 g of potassium carbonate were introduced into a reactor with a capacity of 1.5 liters by including heat A thermostatically controlled water bath of the exchange fluid heats the reactor, and the reactor is equipped with a paddle mechanical stirring system, a system for controlling the temperature of the reaction medium and a rectification column with a reflux head on top. The reaction mixture was heated at full reflux for one hour before starting to remove the methanol formed, at the end of which time the vapor temperature at the top of the column reached 64°C. Subsequent heating of the reaction medium is maintained at a temperature between 68°C and 95°C for 13 hours, at the end of which time the temperature of the vapor at the top of the column reaches 90°C ...

example 2

[0079] Example 2: Preparation of isosorbide bis(methyl carbonate) according to the invention

[0080] Example 1 was repeated with the only difference that instead of 40 equivalents, only 20 equivalents of dimethyl carbonate were used. The composition of the reaction medium obtained after removal of the catalyst particles is shown in Table 1 below.

example 3

[0081] Example 3: Preparation of isosorbide bis(methyl carbonate) according to the invention

[0082] Example 1 was repeated with the only difference that instead of 40 equivalents, only 10 equivalents of dimethyl carbonate were used. The composition of the reaction medium obtained after removal of the catalyst particles is shown in Table 1 below.

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Abstract

The present invention relates to a method for preparing dialkyl carbonates of dianhydrohexitol, said method including the following steps: (a) preparing an initial reaction mixture containing at least one dianhydrohexitol, at least two mole equivalents of a dialkyl carbonate of formula and a transesterification catalyst; (b) heating the reaction mixture to a temperature greater than or equal to the boiling temperature of the formed alcohol, or of the azeotrope thereof, in a reaction chamber preferably provided with a rectification column comprising a sufficient number of theoretical distillation plates to separate the resulting alcohol from the reaction mixture. The invention also relates to certain dialkyl carbonates of dianhydrohexitols produced by said method and to the use thereof for synthesising synthetic polymers.

Description

technical field [0001] The present invention relates to a novel process for the preparation of 1,4:3,6-dianhydrohexitol bis(alkyl carbonates), to certain novel dialkyl carbonates obtained by this process and to these dianhydro Hexitol bis(alkyl carbonates) are used in the preparation of synthetic polymers, especially as (co)monomers for the synthesis of polycarbonate and polyurethane or as The use of chain extenders of the molecular weight of the reactive end group) that reacts with the carbonate functional group. Background technique [0002] Polycarbonates are amorphous thermoplastic materials conventionally obtained by polycondensation of diols with diphenyl carbonate, phosgene or chloromethyl chloroformate. [0003] The toxicity of phosgene, chloromethyl chloroformate or phenol which is inevitably formed in the event of the use of diphenyl carbonate constitutes a major disadvantage in the synthesis of polycarbonates. [0004] In the face of the depletion of fossil reso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D493/04
CPCC07D493/04Y02P20/582C07D307/20C07D495/04
Inventor 帕特里克·富埃尔特斯马蒂亚斯·伊贝尔埃米莉·若西安彼得罗·通多法比奥·阿里科
Owner ROQUETTE FRERES SA
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