Method for preparing diisooctyl terephthalate through catalyzing alcoholysis of polyethylene terephthalate by choline eutectic ionic liquid

A technology of polyethylene terephthalate and poly-pair, which is applied in the preparation of ester group and hydroxyl group, etc., can solve the problems of slow reaction, unstable catalyst and long catalyst activation time.

Inactive Publication Date: 2018-09-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these catalysts have a series of problems such as catalyst instability, corrosion of equipment, slow reaction due to long catalyst activation time, and high reaction temperature.

Method used

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  • Method for preparing diisooctyl terephthalate through catalyzing alcoholysis of polyethylene terephthalate by choline eutectic ionic liquid
  • Method for preparing diisooctyl terephthalate through catalyzing alcoholysis of polyethylene terephthalate by choline eutectic ionic liquid
  • Method for preparing diisooctyl terephthalate through catalyzing alcoholysis of polyethylene terephthalate by choline eutectic ionic liquid

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Experimental program
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Effect test

Embodiment 1

[0024] Using PET granules as raw material, 5.0g PET raw material, 17.0g isooctyl alcohol and 0.25g choline deep eutectic ionic liquid catalyst were added successively in a 50ml three-necked round-bottomed flask. The raw materials for the synthesis catalyst were choline chloride and zinc acetate. The molar ratio is 1:2, and the synthesis conditions are 70°C, 120min. The reaction temperature was controlled at 175° C. under normal pressure, condensed and refluxed for 60 minutes, and then cooled to room temperature. Under these conditions, the degradation rate of PET is 100%, and the selectivity of di-isooctyl terephthalate (DOTP) is 78.2%.

Embodiment 2

[0026] Using PET granules as raw material, 5.0g PET raw material, 17.0g isooctyl alcohol and 0.25g choline deep eutectic ionic liquid catalyst were added successively in a 50ml three-necked round-bottomed flask. The raw materials for the synthesis catalyst were choline chloride and zinc acetate. The molar ratio is 1:1.5, and the synthesis conditions are 70°C, 120min. The reaction temperature was controlled at 185° C. under normal pressure, condensed and refluxed for 60 minutes, and then cooled to room temperature. Under these conditions, the degradation rate of PET is 100%, and the selectivity of di-isooctyl terephthalate (DOTP) is 82.5%.

Embodiment 3

[0028] Using PET granules as raw material, 5.0g PET raw material, 17.0g isooctyl alcohol and 0.25g choline deep eutectic ionic liquid catalyst were added successively in a 50ml three-necked round-bottomed flask. The raw materials for the synthesis catalyst were choline chloride and zinc acetate. The molar ratio is 1:0.25, and the synthesis conditions are 50°C, 240min. The reaction temperature was controlled at 185° C. under normal pressure, condensed and refluxed for 60 minutes, and then cooled to room temperature. Under these conditions, the degradation rate of PET is 99.2%, and the selectivity of di-isooctyl terephthalate (DOTP) is 79.4%.

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Abstract

The invention relates to a method for preparing diisooctyl terephthalate (DOTP) through catalyzing the alcoholysis of polyethylene terephthalate (PET) by a novel catalyst. The method is characterizedin that a choline eutectic ionic liquid is used as the alcoholysis catalyst, and choline chloride is used as a hydrogen bond donor and a metal salt is used as a hydrogen bond acceptor during the synthesis of the catalyst. Isooctanol is used as a solvent in the reaction process, and the PET is alcoholyzed under the following conditions: a molar ratio of the above raw material to the solvent of 1:2.5 to 1:8, a reaction temperature of 145-185 DEG C, normal pressure and a catalyst using amount being 0.5-10% of the mass of the raw material, for 30-180 min. The method has the advantages of simple preparation of the catalyst, low cost, mild reaction conditions, short reaction time, high efficiency, high PET conversion rate, high selectivity of the target product, and green and environmentally-friendly reaction process.

Description

technical field [0001] The invention belongs to the technical field of green and clean catalysis, and relates to a method for preparing diisooctyl terephthalate by catalyzing alcohol decomposition of polyethylene terephthalate (PET) with a novel catalyst. Background technique [0002] Diisooctyl terephthalate (DOTP), also known as bis(2-ethylhexyl) terephthalate, is a new type of plasticizer developed in recent years and is used in polyvinyl chloride (PVC) plastics. A primary plasticizer with excellent performance, widely used. DOTP is used as a plasticizer with low toxicity and high safety. It has been recognized as a non-toxic plasticizer and can be used in medical PVC products and plastic toys. [0003] So far, there are three main methods for industrially synthesizing DOTP: one is the direct esterification of terephthalic acid and isooctyl alcohol; the other is the transesterification of dimethyl terephthalate; the third is polyterephthalic acid Ethylene glycol ester w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/03C07C69/82
CPCC07C67/03C07C69/82
Inventor 吕兴梅周磊刘博孙鹏胡玉峰徐俊丽黄丹蕾周清辛加余张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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