Method for preparing benzonitrile from waste polyphthalate plastic

A technology of polyterephthalate and phthalate, which is applied in the field of organic matter preparation, can solve problems such as unseen benzonitrile, and achieve the effect of low cost

Active Publication Date: 2019-04-12
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are no bibliographical reports and patents that directly utilize pyrolysis to produce benzonitrile with PET

Method used

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  • Method for preparing benzonitrile from waste polyphthalate plastic
  • Method for preparing benzonitrile from waste polyphthalate plastic
  • Method for preparing benzonitrile from waste polyphthalate plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] like figure 1 , in quartz tubular reactor 1 (diameter 10mm, length 250mm), packing catalyst 5%-CaO / Al 2 o 3 , the catalyst is supported by quartz wool 3 to form a catalyst bed 2; the quartz reactor is installed in a temperature-controlled furnace 4, and the temperature of the reactor is monitored by a thermocouple inserted into the surface of the temperature-controlled furnace packed bed. Using NH 3 / N 2 Mixed gas is used as carrier gas, and the ammonia flow rate=80mL / min is controlled by gas flow meter 5, N 2 = 80 mL / min. The raw material of polyethylene terephthalate powder (100 mesh) flows from the opening of the quartz tube reactor to the pyrolysis interface together with the carrier gas flow, and the mass space velocity WHSV of polyethylene terephthalate is 10h -1 , the reaction temperature is controlled at 600°C, the reaction is carried out under the catalysis of the catalyst, the liquid product flows from the reactor to the condenser 6, and the gas product i...

Embodiment 2

[0034] Using polyethylene terephthalate (100 mesh particle size) as raw material, NH 3 As carrier gas (ammonia flow = 160mL / min), 5%-CaO / Al 2 o 3 For catalyst, WHSV 10h -1 ; To test the influence of different reaction temperatures on the yield and selectivity of benzonitrile.

[0035] The impact of table 2 different temperatures on benzonitrile

[0036]

Embodiment 3

[0038] Using polyethylene terephthalate (100 mesh particle size) as raw material, reaction conditions: reaction temperature is 650°C; ammonia gas flow rate = 60mL / min; WHSV 10h -1 . The effect of different catalysts on the yield and selectivity of benzonitrile was tested.

[0039] The influence of table 3 different catalysts on benzonitrile

[0040]

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Abstract

The invention discloses a method for preparing benzonitrile, comprising the steps of: conducting a reaction on polyphthalate under catalytic effect of an acid-base bifunctional catalyst under heatingconditions with a gas containing a reactive nitrogen compound as a carrier gas; and conducting condensation to collect a liquid, and conducting separation on the liquid product to obtain benzonitrile.The method of the invention utilizes renewable resources to selectively prepare benzonitrile by a suitable reaction method, and the whole process from raw material to production process is a renewable, green and environment-friendly route.

Description

technical field [0001] The invention belongs to the field of organic matter preparation, and relates to a method for preparing benzonitrile, in particular to a method for preparing benzonitrile from waste polyethylene terephthalate plastics. Background technique [0002] Benzonitrile is an important aromatic nitrile and a bulk chemical with high added value. It can be used to synthesize benzomelamine with various uses, and can also be hydrolyzed to prepare benzamide and benzene. Formic acid is used as an intermediate in plasticizers, coatings and polymers, and can also be reduced to prepare benzylamine. In addition, benzonitrile can also be emulsified by non-ionic surfactants as a dyeing auxiliary. At present, the main preparation method of benzonitrile is through the ammoxidation of toluene, which has the disadvantages of complex process, low yield and heavy pollution. [0003] Polyethylene terephthalate is polymerized from terephthalic acid and fatty diol, and the main t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/00C07C255/50B01J23/02
CPCB01J23/002B01J23/02B01J2523/00C07C253/00C07C255/50B01J2523/23B01J2523/31B01J2523/41B01J2523/22
Inventor 徐禄江方真张乐瑶
Owner NANJING AGRICULTURAL UNIVERSITY
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