| 发明名称 | Process for making polyethylene terephthalate | ||
| 摘要 | The invention relates to a process for making polyethylene terephthalate (PET) from ethylene glycol (EG), purified terephthalic acid (PTA) and optionally up to 30 mol % comonomer, using a catalyst system essentially consisting of antimony—(Sb), zinc—(Zn) and phosphorous—(P) compounds, comprising the steps of a) esterifying EG and PTA to form diethyleneglycol terephthalate and oligomers (DGT), and b) melt-phase polycondensing DGT to form polyester and EG1 wherein the Sb- and P-compounds are added in step a) and the Zn-compound is added after step a). With this process PET can be obtained that shows favorable color and optical clarity, also if recycling of EG is applied in the process, and a relatively low rate of acetaldehyde regeneration during melt-processing. | ||
| 申请公布号 | US8859713(B2) | 申请公布日期 | 2014.10.14 |
| 申请号 | US201013256437 | 申请日期 | 2010.03.10 |
| 申请人 | Saudi Basic Industries Corporation | 发明人 | Rao Mummaneni Venkateswara;Al-Munif Munif;Bashir Zahir |
| 分类号 | C08G63/00;C08G63/82;C08G63/02;C08G63/86;C08G63/83 | 主分类号 | C08G63/00 |
| 代理机构 | Cantor Colburn LLP | 代理人 | Cantor Colburn LLP |
| 主权项 | 1. A process for making polyethylene terephthalate (PET) from ethylene glycol (EG), purified terephthalic acid (PTA) and optionally up to 30 mol % comonomer, using a catalyst system essentially consisting of antimony—(Sb), zinc—(Zn) and phosphorous—(P) compounds, comprising the steps of a) esterifying EG and PTA in the presence of the Sb-compound and the P-compound at a pressure of 0.1 to 10 MPa to form diethyleneglycol terephthalate and oligomers (DGT), and b) reducing the pressure to 50 to 500 Pa and melt-phase polycondensing DGT to form polyester and EG, wherein the Zn-compound is added after reducing the pressure; and wherein the catalyst system consists essentially of 50-200 ppm of Sb, and 20-200 ppm of Zn, and 40-100 ppm of P (elemental contents based on PET). | ||
| 地址 | Riyadh SA | ||