A METHOD FOR PRODUCING A CARBONATE HAVING AN ETHYL GROUP AND AN APPARATUS FOR PRODUCING A CARBONATE HAVING AN ETHYL GROUP

Claims

1. A method for producing a carbonate having an ethyl group, comprising: a reaction step in which dimethyl carbonate and ethanol are subjected to a transesterification reaction in a reactor in the presence of a catalyst containing an alkali metal compound to obtain a reaction composition; and a distillation step in which the reaction composition is distilled in a distillation column, wherein the method includes an adsorption step in which, before the distillation step or during the distillation step, the alkali metal compound present in the reaction composition is adsorbed using an adsorbent.

2. A method for producing a carbonate having an ethyl group according to claim 1, wherein the concentration of the insoluble substance in the reaction composition at the reaction stage is set to 50 parts per million (ppm) by weight or less.

3. The method for producing a carbonate having an ethyl group according to claim 1, wherein the concentration of the alkali metal in the reaction composition processed in the adsorption step is 500 parts per billion (ppb) by weight or less.

4. A method for producing a carbonate having an ethyl group according to claim 1, wherein the adsorbent at the adsorption stage is a solid adsorbent.

5. A method for producing a carbonate having an ethyl group according to claim 1, wherein the adsorbent at the adsorption stage is an acidic cation exchanger.

6. A method for producing a carbonate having an ethyl group according to claim 5, wherein the acidic cation exchanger includes a sulfonic acid group or a carboxylic acid group.

7. A method for producing a carbonate having an ethyl group according to claim 1, wherein the concentration of the catalyst fed to the reactor at the reaction stage satisfies the condition according to expression (1): [concentration of alkali metal in the reaction composition (molar, parts per meter)] ≤ 0.14 × [reaction temperature (°C)] × [concentration of alcohol in the reaction liquid (molar, %)] - 230... expression (1).

8. The method for producing a carbonate having an ethyl group according to claim 1, further comprising a filtration step in which the reaction composition is filtered after the adsorption step.

9. The method for producing a carbonate having an ethyl group according to claim 1, wherein the reaction temperature in the reaction step is from 30°C or more to 110°C or less.

10. A method for producing a carbonate having an ethyl group according to claim 1, wherein the reactor used in the reaction step is a mechanically stirred reactor or a plug flow reactor.

11. A method for producing a carbonate having an ethyl group according to claim 1, wherein an adsorption column filled with an adsorbent is used at the adsorption stage, and the reduced velocity of the adsorption column is from 0.05 to 15 m / hour.

12. A method for producing a carbonate having an ethyl group according to claim 1, in which, at the adsorption stage, the ratio between the flow rate of the adsorption column and the amount of adsorbent with which it is filled, SV = [flow rate, m 3 / hour] / [amount of filling adsorbent, m 3 -R] is between 0.02 or more and 30 or less.

13. The method for producing a carbonate having an ethyl group according to claim 1, wherein the distillation step includes at least one step selected from the group consisting of a step of removing unreacted raw materials, a step of removing a compound with a low boiling point, a step of purifying ethyl methyl carbonate to a high degree of purity, and a step of purifying diethyl carbonate to a high degree of purity.

14. A method for producing a carbonate having an ethyl group according to claim 13, wherein the distillation step comprises at least three steps selected from the said group.

15. A method for producing a carbonate having an ethyl group according to claim 1, wherein the distillation step comprises: stage of removal of unreacted raw materials, the step of removing the low boiling point compound, and a step of purifying ethyl methyl carbonate to a high degree of purity or a step of purifying diethyl carbonate to a high degree of purity, 16. An apparatus for producing a carbonate having an ethyl group, comprising: a reaction apparatus for subjecting dimethyl carbonate and ethanol to a transesterification reaction in a reactor in the presence of a catalyst containing an alkali metal compound to obtain a reaction composition; a catalyst adsorption apparatus for adsorbing a catalyst from a reaction composition using an adsorbent; and distillation apparatus for distilling the reaction composition.

17. An apparatus for producing a carbonate having an ethyl group according to claim 16, wherein the adsorbent is a solid adsorbent.

18. An apparatus for producing a carbonate having an ethyl group according to claim 16, wherein the adsorbent is an acidic cation exchanger.

19. An apparatus for producing a carbonate having an ethyl group according to claim 18, wherein the acidic cation exchanger includes a sulfonic acid group or a carboxylic acid group.

20. An apparatus for producing a carbonate having an ethyl group according to claim 16, wherein the apparatus for adsorbing the catalyst is an adsorption column filled with an adsorbent.

21. An apparatus for producing a carbonate having an ethyl group according to claim 16, further comprising a filter for filtering the reaction composition after the apparatus for adsorbing the catalyst.

22. An apparatus for producing a carbonate having an ethyl group according to claim 16, wherein the reaction apparatus is a mechanically stirred reactor or a plug flow reactor.

23. An apparatus for producing a carbonate having an ethyl group according to claim 16, wherein the distillation apparatus includes at least one selected from the group consisting of a distillation column for removing unreacted raw materials, a distillation column for removing a low boiling point compound, a distillation column for purifying ethyl methyl carbonate to a high degree of purity, and a distillation column for purifying diethyl carbonate to a high degree of purity.

24. An apparatus for producing a carbonate having an ethyl group according to claim 23, wherein the distillation apparatus comprises at least three apparatuses selected from the said group.

25. An apparatus for producing a carbonate having an ethyl group according to claim 16, wherein the distillation apparatus includes: distillation column to remove unreacted raw materials, a distillation column to remove the low boiling point compound, and a distillation column for purifying ethyl methyl capbonate to a high degree of purity or a distillation column for purifying diethyl carbonate to a high degree of purity.