Device and method for producing polybutylene succinate
A device and a method for producing high-quality polybutylene succinate are provided. The method for producing polybutylene succinate comprises the steps of: preparing a raw-material slurry by mixing succinic acid or a derivative thereof with 1,4-butanediol in a raw-material slurry preparation tank; storing the raw-material slurry in a raw-material slurry storage tank while maintaining flowability; carrying out an esterification reaction of the raw-material slurry in an esterification reactor; and synthesizing polybutylene succinate with a polycondensation reaction of the ester in a polycondensation reactor, in which the polycondensation reactor is divided, from the upstream side, into at least an initial polycondensation reactor, an intermediate polycondensation reactor, and a final polycondensation reactor, a catalyst is added in an amount from 1000 ppm to 3000 ppm in relation to succinic acid or a derivative thereof, the reaction time in the intermediate polycondensation reactor ranges from 0.25 hours to 0.75 hours, and the reaction temperature in the final polycondensation reactor ranges from 245° C. to 255° C.
1. A method for producing polybutylene succinate, comprising the steps of:
preparing a raw-material slurry by mixing succinic acid or a derivative thereof with 1,4-butanediol in a raw-material slurry preparation tank;
storing the raw-material slurry in a raw-material slurry storage tank while maintaining flowability;
carrying out an esterification reaction of the raw-material slurry in an esterification reactor; and
synthesizing polybutylene succinate through a polycondensation reaction of the ester in a polycondensation reactor; wherein
the polycondensation reactor is divided into, from the upstream side, at least an initial polycondensation reactor, an intermediate polycondensation reactor, and a final polycondensation reactor;
a catalyst is added in an amount from 1000 ppm to 3000 ppm in relation to succinic acid or a derivative thereof;
the reaction time in the intermediate polycondensation reactor ranges from 0.25 hours to 0.75 hours; and
the reaction temperature in the final polycondensation reactor ranges from 245° C. to 255° C.
2. The method for producing polybutylene succinate according to claim 1 , wherein the reaction time in the intermediate polycondensation reactor ranges from 235° C. to 245° C.
3. The method for producing polybutylene succinate according to claim 2 , wherein the reaction temperature in the final polycondensation reactor is higher than the reaction temperature in the intermediate polycondensation reactor by 5° C. to 15° C.
4. A device for producing polybutylene succinate, comprising:
a raw-material slurry preparation tank for preparing a raw-material slurry by mixing succinic acid or a derivative thereof with 1,4-butanediol;
a raw-material slurry storage tank for storing the prepared raw-material slurry while maintaining flowability;
an esterification reactor for an esterification reaction of the raw-material slurry; and
a polycondensation reactor for synthesizing polybutylene succinate through a polycondensation reaction of the ester; wherein
the polycondensation reactor is divided into, from the upstream side, at least an initial polycondensation reactor, an intermediate polycondensation reactor, and a final polycondensation reactor;
the device has a catalyst adding apparatus for adding a catalyst in an amount from 1000 ppm to 3000 ppm in relation to succinic acid or a derivative thereof;
the reaction time in the intermediate polycondensation reactor is set from 0.25 hours to 0.75 hours, and the reaction temperature in the final polycondensation reactor is set from 245° C. to 255° C.
5. The device for producing polybutylene succinate according to claim 4 , wherein the reaction temperature in the intermediate polycondensation reactor is set from 235° C. to 245° C.
6. The device for producing polybutylene succinate according to claim 5 , wherein the reaction temperature in the final polycondensation reactor is set to be higher than the reaction temperature in the intermediate polycondensation reactor by 5° C. to 15° C.
7. The device for producing polybutylene succinate according to claim 4 , wherein the reaction temperature in the final polycondensation reactor is set to be higher than the reaction temperature in the intermediate polycondensation reactor by 5° C. to 15° C.
8. The method for producing polybutylene succinate according to claim 1 , wherein the reaction temperature in the final polycondensation reactor is higher than the reaction temperature in the intermediate polycondensation reactor by 5° C. to 15° C.