Research On The Production Of Eco-friendly PET With Titanium Catalyst

In order to meet increasingly high environmental targets for PET products in the market,to produce eco-friendly PET products and expand the product market have become an important issue. Mainly based on Sinopec Tianjin branch producing eco-friendly PET, this paper aims at the development of a novel titanium catalyst to replace the antimony catalyst which conventional used for PET. The purpose of this paper is to investigate a new pathway for the preparation of eco-friendly PET with less content or non-heavy metal antimony.The thesis is divided into two parts--laboratory research and industrial application. For the laboratory research, PET was synthesed through the etherification reaction between PTA and EG, carrying out as batch wise reaction. The optimal parameters were determined, including the components of the catalyst, reaction temperature and reaction pressure, etc. The results show that the catalytic activity of the new titanium catalyst is much higher than antimony catalyst, 220 ppm antimony catalyst can be replaced by 7 ppm titanium catalyst, the amount of catalyst is significantly reduced. In the synthesis experiment of Polyester Fiber, as increasing the proportion of titanium catalyst, esterification and polymerization rate was accelerated, the hue b value remained below 4.5, still within the range of excellent products. The heavy metal antimony content in PET was reduced, making products with better environmental performance. In the synthesis experiments of Polyester Film, antimony catalyst was completely replaced by titanium catalyst. As a result, the product achieves the goal of zero heavy metal antimony content.In industrial applications, the high activity of the titanium catalyst, achieve the goal of Saving energy, increasing productivity and producing environmentally friendly PET. For Polyester Fiber, 25% and 50% of the antimony catalyst was replaced by titanium catalyst respectively, and the heavy metal antimony contents of the obtained products were reduced by 25% and 50%. To produce eco-friendly Polyester Film, antimony catalyst was completely replaced by titanium catalyst and the heavy metal content of the films was close to zero.