A kind of method for efficiently preparing polytrimethylene terephthalate (ptt)
A technology of polytrimethylene terephthalate and terephthalic acid, which is applied in the field of efficient preparation of polytrimethylene terephthalate (PTT), can solve the problems of polyacrolein, high hue b value and high carboxyl content, and achieves the Low by-product content, high intrinsic viscosity, and improved quality
Active Publication Date: 2022-07-01
EAST CHINA UNIV OF SCI & TECH
View PDF20 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] It can be seen that in the existing PTT process of PTA and 1,3-PDO polymerization, there are composite catalysts formed by compounding titanate and other compounds. This type of catalyst is easy to hydrolyze to form TiO 2 Hydrates make it difficult to disperse into the reactants, and at the same time cause a decrease in catalyst activity and an increase in dosage; and titanate is easy to make PTT polyester yellow, and the hue b value is relatively high
In addition, due to the long reaction time of some catalysts, stabilizers or antioxidants need to be added, and more acrolein is likely to be produced during the polycondensation process. The content of carboxyl groups in PTT products is high, which affects the quality of PTT products.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0026] 5 g of tetrabutyl titanate was added to 75 mL of ethylene glycol solution, then 3.15 g of magnesium acetate was added, stirred at room temperature for 5 h, aged for 5 h, filtered, washed with deionized water for several times, and dried at 80 °C for 12 h. After calcination at 550℃ for 3h, white powder catalyst MgTiO was obtained 3 .
Embodiment 2
[0028] 10g of tetrabutyl titanate was added to 150mL of ethylene glycol solution, then 3.15g of magnesium acetate was added, stirred at room temperature for 7h, aged for 4h, filtered, washed with deionized water for several times, and dried at 100°C for 8h. After calcination at 500℃ for 4h, white powder catalyst MgTi was obtained2 O 5 .
Embodiment 3
[0030] 15g of tetrabutyl titanate was added to 675mL of 1,3-propanediol solution, then 3.15g of magnesium acetate was added, stirred at room temperature for 5h, aged for 6h, filtered, washed several times with deionized water, and dried at 80°C for 12h , calcined at 550 °C for 3 h to obtain a white powder catalyst MgTi 3 O 7 .
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a method for efficiently preparing polytrimethylene terephthalate (PTT). Polytrimethylene terephthalate (PTT) is prepared by esterification, prepolymerization and polycondensation of terephthalic acid and 1,3-propylene glycol. ) process to M x Ti y O z Compounds are catalysts for efficient catalytic preparation. In the catalyst, the metal M is the IIA element, and the molar ratio of M to titanium is x:y=1:5~5:1. The compound of titanate and M is added to the glycol solution, and the reaction is carried out at 0~150 ℃ for 0.5 After ~10h, it is prepared by filtration, washing, drying, and calcination at 350~700℃ for 1~7h. Using this catalyst to prepare PTT shortens the time of esterification and polycondensation, improves the intrinsic viscosity of PTT, and reduces the b value of hue. The intrinsic viscosity of PTT products is 0.91~1.15dl / g, and the b value is lower than 3.0, which has good industrial application. prospect.
Description
technical field [0001] The invention belongs to the field of catalytic reaction engineering, and relates to a method for efficiently preparing polytrimethylene terephthalate (PTT). , The method for preparing polytrimethylene terephthalate (PTT) by esterification, prepolymerization and polycondensation of 3-propanediol. Background technique [0002] Poly trimethylene terephthalate (Poly trimethylene terephthalate) is a kind of terephthalic acid (PTA) and 1,3-propanediol (1,3-PDO) as raw materials through esterification, prepolymerization and Polycondensation reaction can also be prepared by dimethyl terephthalate (DMT) and 1,3-PDO as raw materials. An aromatic polyester fiber prepared by transesterification, prepolymerization and polycondensation reaction, referred to as PTT, also known as 3GT . The unique 3 methylene structures make PTT not only inherit the rigidity of polyethylene terephthalate (PET), but also possess the chain flexibility comparable to that of polybutyle...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/85C08G63/83
CPCC08G63/183C08G63/85C08G63/83
Inventor 方云进沈卫华高庆龙
Owner EAST CHINA UNIV OF SCI & TECH