Abstract: Provided are a device and a method for efficiently producing a polyester by using 1,4-butanediol as a starting material. The device for producing a polyester includes: a preparation tank (4) for starting material slurry; a storage tank (6) for starting material slurry; an esterification reactor (9); an initial polycondensation reactor (11); a middle polycondensation reactor (13); and a final polycondensation reactor (15). An exhaust system for each of the initial, middle, and final polycondensation reactors includes a wet condenser (17, 23, or 31) using a liquid containing 1,4-butanediol as a coolant; and a hot well (22, 30, or 38) connected to the corresponding wet condenser. Herein, process scattered substances scattering with exhaust are collected, and hydrolyzed in the hot well, so as to be returned to the esterification step. This allows the polyester to be efficiently produced.

Abstract: Provided are a device and a method for efficiently producing a polyester by using 1,4-butanediol as a starting material. The device for producing a polyester includes: a preparation tank (4) for starting material slurry; a storage tank (6) for starting material slurry; an esterification reactor (9); an initial polycondensation reactor (11); a middle polycondensation reactor (13); and a final polycondensation reactor (15). An exhaust system for each of the initial, middle, and final polycondensation reactors includes a wet condenser (17, 23, or 31) using a liquid containing 1,4-butanediol as a coolant; and a hot well (22, 30, or 38) connected to the corresponding wet condenser. Herein, process scattered substances scattering with exhaust are collected, and hydrolyzed in the hot well, so as to be returned to the esterification step. This allows the polyester to be efficiently produced.

Abstract: This invention provides a cost-effective method for removing impurities from waste glycerin generated in the process of biodiesel production, so as to prevent a supercritical water reaction tube from clogging, when synthesizing acrolein by allowing supercritical water and acid to react with glycerin.

Abstract: An object of the present invention is to provide a technology which can suppress the blockage and abrasion of pipes and devices caused by the production of by-products and stably synthesize acrolein at a high yield, under a condition in which energy efficiency is improved by an elevated concentration of glycerol in a reaction liquid, in a process for synthesis of acrolein by reacting supercritical water and an acid with glycerol. An embodiment of the present invention includes: setting a concentration of glycerol in the reaction liquid at 30% by weight or lower; also cooling the reaction liquid to a temperature between a temperature (300° C. or lower) at which the reaction stops and a temperature (100° C.

Abstract: This invention provides a cost-effective method for removing impurities from waste glycerin generated in the process of biodiesel production, so as to prevent a supercritical water reaction tube from clogging, when synthesizing acrolein by allowing supercritical water and acid to react with glycerin.

Abstract: An object of the present invention is to provide an industrially applicable method for producing acrolein via treatment with supercritical water from glycerin obtained as a by-product during the process of biodiesel fuel production from waste animal/plant fat or oil with the use of an alkali catalyst. The present invention provides a method for producing acrolein, which comprises: a determination step of determining the hydrogen ion concentration in glycerin obtained as a by-product; an acid addition step of adding to the glycerin an acid at an amount calculated based on the results of the determination step so as to make the glycerin acidic; and a supercritical water treatment step of allowing supercritical water to act on the glycerin after the acid addition so as to produce acrolein from the glycerin.

Abstract: In a method and apparatus for producing a useful substance by allowing a fluid containing a biomass raw material to act on a supercritical water and/or subcritical water, the fluid containing a biomass raw material in a high concentration is efficiently mixed with the supercritical water and/or subcritical water, whereby the amount of tar and carbon particles produced as by-products is decreased and blockage and abrasion of a pipe and an equipment is suppressed, or it is possible to easily remove the by-products. At least two inlet flow paths for flowing the raw material fluid and the supercritical water or subcritical water into the mixing flow path are provided, along with an agitation blade having a rotating shaft set on a center shaft of the mixing flow path and an agitation blade having a rotating shaft set on a center shaft of the mixing flow path.

Abstract: 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.

Abstract: An object of the present invention is to provide a method for commercially manufacturing acrolein in a large flow rate by making supercritical water and an acid interact with glycerin, wherein by efficiently mixing high-concentration glycerin and supercritical water with each other, the method is made capable of making the synthesis stably proceed with a high yield while the occlusion and abrasion of the pipes and devices due to the generation of by-products are being suppressed.

Abstract: An object of the present invention is to provide a technology which can suppress the blockage and abrasion of pipes and devices caused by the production of by-products and stably synthesize acrolein at a high yield, under a condition in which energy efficiency is improved by an elevated concentration of glycerol in a reaction liquid, in a process for synthesis of acrolein by reacting supercritical water and an acid with glycerol. An embodiment of the present invention includes: setting a concentration of glycerol in the reaction liquid at 30% by weight or lower; also cooling the reaction liquid to a temperature between a temperature (300° C. or lower) at which the reaction stops and a temperature (100° C.

Abstract: When obtaining a target substance by gradually cooling the reaction liquid by cooling in a plurality of stages divided in series, and then distilling the cooled reaction liquid by distillation in a plurality of stages divided in series, this method and this apparatus include: circulating a heating medium to be used for cooling in the plurality of the stages by way of; sequentially passing the heating medium toward the most upstream cooling stage from the most downstream cooling stage of the reaction liquid; cooling the heating medium which has been discharged from the most upstream cooling stage by using the heating medium for keeping or raising the temperature of the liquid which has been discharged from the distillation in the plurality of the stages; and returning the cooled heating medium back to the most downstream cooling stage of the reaction liquid.

Abstract: 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.

Abstract: An object of the present invention is to provide an industrially applicable method for producing acrolein via treatment with supercritical water from glycerin obtained as a by-product during the process of biodiesel fuel production from waste animal/plant fat or oil with the use of an alkali catalyst. The present invention provides a method for producing acrolein, which comprises: a determination step of determining the hydrogen ion concentration in glycerin obtained as a by-product; an acid addition step of adding to the glycerin an acid at an amount calculated based on the results of the determination step so as to make the glycerin acidic; and a supercritical water treatment step of allowing supercritical water to act on the glycerin after the acid addition so as to produce acrolein from the glycerin.

Abstract: An object of the present invention is to provide a reasonable polycondensation step by which an appropriate molecular weight can be obtained and material decomposition associated with thermolysis can be suppressed, so as to contribute to production technology for PTT polymers. The production method for polytrimethylene terephthalate comprises an esterification step and a polycondensation step, wherein the polycondensation step is divided into multiple stages, polycondensation is performed using a polymerization vessel having a twin-shaft agitator in the final stage of the polycondensation step, and the polymerization temperature during the subsequent stage of the polycondensation step is less than the polymerization temperature during the former stage of the polycondensation step.

Abstract: An object of the present invention is to provide a method for commercially manufacturing acrolein in a large flow rate by making supercritical water and an acid interact with glycerin, wherein by efficiently mixing high-concentration glycerin and supercritical water with each other, the method is made capable of making the synthesis stably proceed with a high yield while the occlusion and abrasion of the pipes and devices due to the generation of by-products are being suppressed.