6422-86-2Relevant articles and documents
Alcoholysis of polyethylene terephthalate to produce dioctyl terephthalate using choline chloride-based deep eutectic solvents as efficient catalysts
Zhou, Lei,Lu, Xingmei,Ju, Zhaoyang,Liu, Bo,Yao, Haoyu,Xu, Junli,Zhou, Qing,Hu, Yufeng,Zhang, Suojiang
, p. 897 - 906 (2019)
Dioctyl terephthalate (DOTP) is a new kind of green and non-toxic plasticizer. The traditional process to prepare DOTP is costly and complicated, thus it is very necessary to find an efficient and environmentally-friendly way to obtain DOTP. In this study, we prepared DOTP from the alcoholysis of polyethylene terephthalate (PET) by using 2-ethyl-1-hexanol (2-EH) as the solvent, and used choline chloride-based deep eutectic solvents (ChCl-based DESs) as the catalysts due to their cheapness, low toxicity and ease of preparation. Under the optimized conditions (ChCl/Zn(Ac)2 1:1, 5 wt%, 180 °C, 60 min, PET:2-EH 1:5 molar ratio), the conversion of PET and the yield of DOTP were 100% and 84.7%, respectively. Furthermore, the possible mechanism was proposed through density functional theory (DFT) calculations and experimental results. It revealed that the hydrogen bonds (H-bonds) formed between 2-EH and DESs played a key role in accelerating the degradation process. Furthermore, the kinetics of the reaction was also investigated, and the results indicated that the alcoholysis of PET is a first-order reaction with an activation energy of 95.05 kJ mol-1. This work confirmed that ChCl-based DESs are favorable for the degradation of PET to prepare DOTP under mild conditions, which can also be used for other polymer degradation strategies.
METHODS FOR MANUFACTURING AND DECOLORIZING DIOCTYL TEREPHTHALATE
-
Paragraph 0046-0047, (2021/04/30)
A method for manufacturing and a method for decolorizing dioctyl terephthalate are provided. The decolorizing dioctyl terephthalate includes: providing an unpurified dioctyl terephthalate; mixing the unpurified dioctyl terephthalate with a reducing agent and an adsorption medium to obtain a first decolorizing product; and mixing the first decolorizing product with a decolorizing adsorbent material to obtain a second decolorizing product. The method for manufacturing dioctyl terephthalate includes: a transesterification step, an alkaline washing and neutralization step, a redox step, a decolorization step and a stripping step; the decolorizing adsorbent material has an acid value between 0.1 and 2 mg KOH/g, a relative humidity between 2 and 10%, and a fineness between 80 and 100 cm2 /g.
ESTER COMPOUNDS AND THEIR APPLICATION AS PLASTICISER
-
Paragraph 0167-0168, (2021/06/01)
The present invention relates to a novel ester-based compound and a use thereof and, especially, to a use of a novel ester-based compound as a plasticizer to improve heat resistance and compatibility. The use of the ester-based compound according to the present invention as a plasticizer for a heat-resistant resin composition can contribute to the improvement in properties of a molded product by offering synergistic effects in the improvement of properties, such as migration resistance and a weight loss on heating, and can improve the processability of a heat-resistant resin composition through a fast absorption rate and a short melting time.