Beijing National Institute of Science and Technology (Tel: 0 10-685 17625,13520617187)
Transfer of patents and technology introduction
Transfer of patent name: application (patent)No. of nanometer antimony trioxide as polyester polycondensation catalyst: 01109475; Technical application for the production of polyethylene terephthalate (patent)No.: 02 123652. Supplementary contents: production method and production equipment drawings of nanometer antimony trioxide.
1, the production method and equipment of nanometer antimony trioxide, this technology is simple to produce, the equipment and raw materials are cheap and all made in China, which can be industrialized. The annual output of a set of equipment can reach 400 tons, with a large output and mature technology. The particle size of the produced nanometer antimony trioxide is 10- 100 nm.
2. Application of nanometer antimony trioxide as polyester polycondensation catalyst. Compared with the catalyst antimony acetate, this patent has the characteristics of low cost, small average particle size, uniform dispersion in polyester polymerization, good solubility and high catalytic activity. As we all know, the raw materials for producing PET are mainly terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG). Its production process is also well known to those skilled in the art. The catalyst used is usually Sb(Ac)3. According to the invention, after the esterification reaction or transesterification reaction of terephthalic acid (PTA) and dimethyl terephthalate (DMT), nano Sb2O3 is used to replace Sb(Ac)3 as a catalyst for molecular polycondensation reaction, and unexpected effects are achieved. Its dosage is less than half of that of Sb(Ac)3, but it achieves the same catalytic effect as that of Sb(Ac)3, and even exceeds that of Sb(Ac)3 in some indexes, thus greatly saving the cost and improving the catalytic effect.
3. "Production Technology of Polyethylene Terephthalate", nanometer antimony trioxide has small particle size, high activity and strong adsorption capacity. Practice has proved that two antimony ions exist independently and play the role of two antimony ions in catalysis. However, nano-antimony trioxide is easy to be lost in the process of use, and it is difficult to disperse evenly in the reaction, so the catalytic effect is not ideal. The purpose of this patent is to solve the above problems and provide a new production process of polyethylene terephthalate (PET). Moreover, with this patented process, the dosage of nano-Sb2O3 is half that of Sb(Ac)3 (theoretically, the molecular weight of Sb(Ac)3 is 298, and that of one antimony is 292, and there are two antimony ions, which can be dissociated into two independent antimony ions). Compared with ordinary pyrometallurgical method (plasma method) Sb2O3, its catalytic efficiency is increased by about 10 ~ 15%.