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IPDI (Isopropylidene Diphenyl Ionitrile) is an important raw material for chemical production, widely used in fields such as medicine, pesticides, and dyes. This article will introduce the manufacturing methods of IPDI, including raw material preparation, reaction process, post-treatment, and other links

1、 The main raw materials for manufacturing IPDI are aniline and acetone. In order to ensure the smooth progress of the reaction, it is necessary to perform certain pre-treatment on the raw materials

1. Pre treatment of aniline 

Aniline often contains water and impurities, so drying and purification are necessary. Generally, distillation is used to heat aniline to boiling and evaporate pure aniline

2. Pre treatment of acetone 

Acetone may also contain water and other impurities, which also require drying and purification. The commonly used method is to add anhydrous sodium sulfate and other desiccants, and then distill to obtain pure acetone

2、 The manufacturing process of IPDI mainly includes the following steps: 

1 Addition reaction of aniline and acetone 

Add the pre treated aniline and acetone in a certain proportion to the reactor, heat to a certain temperature, and add the catalyst. Under the action of a catalyst, aniline and acetone undergo an addition reaction to produce N-phenyl-2-propanone amine

2. Dehydration cyclization reaction 

N-phenyl-2-propanone amine undergoes dehydration cyclization reaction under acidic conditions, generating IPDI. This reaction generally requires the addition of acid catalysts, such as sulfuric acid or hydrochloric acid. During the reaction process, temperature and pH values need to be controlled to ensure the smooth progress of the reaction

3、 After the reaction is completed, the product needs to be separated and purified. Distillation is generally used to separate the product from the reaction solution and further purify and dry it. Ultimately obtaining pure IPDI products

4、 Notes 

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. It is necessary to precisely control the reaction temperature and pH value to avoid the occurrence of side reactions and the decomposition of products

During the post-processing process, it is necessary to ensure the purity and dryness of the product to avoid affecting its application performance

In summary, the manufacturing process of IPDI requires strict control of process parameters and quality indicators at each stage to ensure product quality and yield.