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Preparation method of terephthaloyl chloride, terephthaloyl chloride and application as well as preparation method of p-phenylenediamine and p-phenylenediamine

A technology of terephthaloyl dichloride and p-phenylenediamine, which is applied in the field of chemical raw material preparation, can solve the problems of low purity of p-phenylenediamine, unstable product quality, and difficult waste disposal, and achieve good product stability and easy Implementation, low cost effect

Active Publication Date: 2018-10-16
南京道港贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The production of p-phenylenediamine by the existing chemical reduction method produces a large amount of industrial wastewater, serious environmental pollution, difficulty in waste disposal, low purity of p-phenylenediamine produced, and high cost
The existing catalytic hydrogenation method, due to the use of expensive noble metal catalysts, is very costly; and involves flammable and explosive products, poor safety, and unstable product quality

Method used

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  • Preparation method of terephthaloyl chloride, terephthaloyl chloride and application as well as preparation method of p-phenylenediamine and p-phenylenediamine
  • Preparation method of terephthaloyl chloride, terephthaloyl chloride and application as well as preparation method of p-phenylenediamine and p-phenylenediamine
  • Preparation method of terephthaloyl chloride, terephthaloyl chloride and application as well as preparation method of p-phenylenediamine and p-phenylenediamine

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preparation example Construction

[0047]In the first aspect, in at least one embodiment, a kind of preparation method of terephthaloyl chloride is provided, using PET waste as starting material, comprising the following steps:

[0048] (a) PET waste and metal ethylene glycol salt are reacted in the presence of low-carbon alcohols to obtain metal terephthalate and ethylene glycol;

[0049] (b) react the metal salt of terephthalic acid with a chlorinating agent to obtain terephthaloyl chloride.

[0050] According to the present invention, PET is Polyethyleneterephthalate, and its Chinese name is polyethylene terephthalate; it is a common resin in life.

[0051] In order to reduce the most important preparation cost, the present invention does not use the existing high-purity and expensive terephthalic acid as the starting material, but creatively proposes to use the extremely cheap PET waste discarded as garbage as the starting material to prepare Terephthaloyl chloride (TPC, terephthaloyl chloride). The inven...

Embodiment 1

[0110] A kind of preparation method of terephthaloyl chloride, take PET waste as starting raw material, comprises the following steps:

[0111] (a) Mix 80g of waste PET bottle fragments, 5g of waste PE bottle fragments, 5g of waste PP bottle fragments, 30mL of sodium ethylene glycol, 50g of sodium hydroxide, and 500mL of methanol for reaction. Reflux, the reaction pressure is 1×10 5 Pa was reacted for about 1 hour to obtain a white precipitate of sodium terephthalate and ethylene glycol. After the reaction, filter the reaction solution with a 20-mesh sieve to filter out the PE and PP bottle fragments; wash the filtered PE and PP fragments with methanol, dry them and weigh them. The result is the same as the initial weight; furthermore, it shows that only waste PET bottles A hydrolysis reaction was carried out.

[0112] The reaction solution after removing PE and PP fragments was filtered to filter out the white precipitate sodium terephthalate, and then the obtained white pr...

Embodiment 2

[0121] A kind of preparation method of terephthaloyl chloride, take PET waste as starting raw material, and the difference of embodiment 1 is:

[0122] Replace sodium ethylene glycol and sodium hydroxide in embodiment 1 with potassium ethylene glycol and potassium hydroxide, and all the other are identical with embodiment 1.

[0123] The chromatographic content of the terephthaloyl chloride prepared in this example was 99.91%, and the yield was 99.2%.

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Abstract

The invention belongs to the technical field of chemical material preparation and relates to a preparation method of terephthaloyl chloride, terephthaloyl chloride and an application as well as a preparation method of p-phenylenediamine and p-phenylenediamine. According to the preparation method of terephthaloyl chloride, PET waste is taken as an initial material and the preparation method comprises the steps as follows: (a) the PET waste reacts with metal ethylene glycol salt in the presence of low carbon alcohol to produce metal terephthalate and ethylene glycol; (b) metal terephthalate reacts with a chlorinating agent to produce terephthaloyl chloride. The process is simple and easy to implement, waste PET materials can be recycled, pollution can be reduced, the production cost of terephthaloyl chloride and p-phenylenediamine can be greatly reduced, and the method is good in safety and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of preparation of chemical raw materials, and in particular relates to a preparation method of terephthaloyl dichloride, terephthaloyl dichloride and its application, a preparation method of p-phenylenediamine and p-phenylenediamine. Background technique [0002] Terephthaloyl chloride is an important organic chemical raw material, which is widely used in industrial materials, electrical insulation materials, protective clothing and interior decoration materials. [0003] At present, terephthaloyl chloride is mainly prepared from terephthalic acid as a raw material. According to different acid chloride reagents, it is mainly divided into thionyl chloride method, phosphorus pentachloride method and phosgene method. For example, a more representative preparation method is to add a small amount of pyridine to terephthalic acid, and then react with excess thionyl chloride at 75-80°C for about 12 hours to generat...

Claims

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Application Information

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IPC IPC(8): C07C63/30C07C51/60C07C51/41C07C63/28C07C211/51C07C209/00
CPCC07C51/412C07C51/60C07C63/28C07C63/30C07C209/00C07C211/51
Inventor 金榮範
Owner 南京道港贸易有限公司
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