Phenol ketone products

Plastic rubber

Current Location： Home > News > Chemical Knowledge > Manufacturing method and process of IPDI

[Chemical Knowledge]：Manufacturing method and process of IPDI

Read： 907 Time：20months ago Source：Transform the World with Simplicity

IPDI(Isopropylidene Diphenyl Isonitrile) is an important raw material for chemical production, which is widely used in medicine, pesticides, dyes and other fields. This article will introduce the manufacturing method of IPDI, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The main raw materials for the manufacture of IPDI are aniline and acetone. In order to ensure the smooth progress of the reaction, the raw materials need to be pretreated.

1. Aniline pretreatment
Aniline often contains water and impurities, so it needs to be dried and purified. Generally, the method of distillation is used to heat aniline to boiling and evaporate pure aniline.

2. Pretreatment of acetone
acetone may also contain moisture and other impurities, which also need to be dried and purified. The common method is to add desiccant such as anhydrous sodium sulfate, and then conduct distillation to obtain pure acetone.

2. reaction process

The manufacturing process of IPDI mainly includes the following steps:

1. Addition reaction
of aniline and acetone The pretreated aniline and acetone are added into a reactor according to a certain proportion, heated to a certain temperature, and a catalyst is added. In the presence of a catalyst, aniline and acetone undergo an addition reaction to form N-phenyl -2-acetone amine.

2. Dehydration ring-closing reaction
N-phenyl -2-acetone amine will undergo dehydration ring-closing reaction under acidic conditions to generate IPDI. This step reaction generally requires the addition of an acid catalyst, such as sulfuric acid or hydrochloric acid. The temperature and pH value need to be controlled during the reaction to ensure the smooth progress of the reaction.

3. work-up

After the reaction is complete, the product needs to be isolated and purified. The product is typically separated from the reaction solution by distillation and further purified and dried. A pure IPDI product is finally obtained.
Precautions for
4.

1. In the manufacturing process, it is necessary to strictly control the quality and proportion of raw materials to ensure the smooth progress of the reaction and the quality of the product.
2. Precise control of the reaction temperature and pH is required to avoid side reactions and decomposition of the product.
3. In the post-processing process, it is necessary to ensure the purity and dryness of the product to avoid affecting the application performance of the product.

In short, the manufacturing process of IPDI needs to strictly control the process parameters and quality indicators of each link to ensure product quality and yield.

Previous： HDI manufacturing methods and processes.

Next： The manufacturing method and process of AA.

News Categories