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A kind of method for preparing terephthalonitrile by polyethylene terephthalate

A technology of terephthalonitrile and solid acid catalyst, which is applied to the preparation of carboxylic acid nitrile, chemical instruments and methods, and the preparation of organic compounds, etc., to achieve the effect of low cost

Active Publication Date: 2018-05-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It takes about 200-400 years for PET to degrade itself, and the resulting environmental pollution is becoming more and more serious

Method used

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  • A kind of method for preparing terephthalonitrile by polyethylene terephthalate
  • A kind of method for preparing terephthalonitrile by polyethylene terephthalate
  • A kind of method for preparing terephthalonitrile by polyethylene terephthalate

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In this example, a quartz tubular reactor with a diameter of 10 mm and a length of 250 mm was used. In the reactor, the catalyst was supported by quartz wool. Install the quartz reactor in a temperature-controlled furnace. Reactor temperature was monitored by thermocouples inserted into the surface of the temperature-controlled furnace packed bed. During operation, use NH 3 , NH 3 / N 2 or NH 3 / He mixed gas is used as the carrier gas, and its flow rate is controlled by a gas flow meter. The powdery raw materials flow together with the carrier gas flow from the opening of the quartz tube to the pyrolysis interface. The reaction temperature is 200-1000°C, and the carrier gas flow rate is 5-200mL / min. Liquid products flow from the reactor to the condenser and gaseous products are collected in gas sampling bags. Liquid and gaseous products were analyzed using a gas chromatograph.

Embodiment 2

[0034] In this example, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polypentylene terephthalate, polyterephthalate Preparation of terephthalonitrile by catalytic pyrolysis of different raw materials such as hexanediol ester.

[0035]

[0036]

[0037] Reaction conditions: the reaction temperature is 600°C; the catalyst is P 2 o 5 / Al 2 o 3 ; Ammonia gas flow rate = 60mL / min.

Embodiment 3

[0039] In this embodiment, the influence of different reaction temperatures on the yield and selectivity of terephthalonitrile was tested.

[0040]

[0041] Reaction conditions: the raw material is polyethylene terephthalate; the catalyst is P 2 o 5 / Al 2 o 3 ; Ammonia flow = 60mL / min.

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Abstract

The application of the invention relates to a method for preparing para-phthalonitrile from polyester terephthalate. The method comprises the following steps of enabling polyester terephthalate to react under the catalysis action of a catalyst in a reactor under the circumstance of carrying gas containing a reactive nitrogen compound under the heating condition; and condensing to collect a liquid product, and separating the liquid product to obtain para-phthalonitrile. The renewable resources are used, and para-phthalonitrile is selectively prepared through a proper reaction method. The whole process from the raw material to the production process is a renewable environmentally-friendly way.

Description

technical field [0001] The invention relates to the field of organic matter preparation, in particular to a method for terephthalonitrile. Background technique [0002] Terephthalonitrile is an important aromatic nitrile and a bulk chemical with high added value. It can be used to prepare p-xylylenediamine by hydrogenation, which is an important raw material for polyamide and a good epoxy resin curing agent at present; tetrachloroterephthalonitrile can be prepared by reacting terephthalonitrile with chlorine gas, which can be used in the synthesis of Herbicides chlorphthalic acid, pyrethroid insecticides and cerebral thrombosis drugs. Because of its extremely wide range of applications, in recent years, the demand for it in domestic and foreign markets has increased year by year. At present, the main production method of terephthalonitrile is the ammoxidation of p-xylene; this method has disadvantages such as complex process, high cost, low yield, and heavy pollution. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C255/51
CPCC07C253/00C07C255/51
Inventor 张颖徐禄江姚倩傅尧
Owner UNIV OF SCI & TECH OF CHINA
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