The prospect of caprolactam to hexamethylenediamine can be expected

One innovation sets up two product chains

The process of preparing hexamethylenediamine from caprolactam was not economical, and its development prospects were uncle.

The economy is gradually emerging

The process of preparing hexamethylenediamine from caprolactam is that under the action of a catalyst, caprolactam and ammonia generate aminocapronitrile, and then the aminocapronitrile is hydrogenated to obtain hexamethylenediami.

As the main raw material of this process, the production capacity and output of caprolactam in China have grown steadily since 2010, and the number of new and expanded caprolactam projects has gradually increas.

Compared with the production of hexamethylenediamine by direct hydrocyanation of butadiene, the average price of liquid caprolactam in China is 13,800 yuan (ton price, the same below), and the cost of raw materials for the production of hexamethylenediamine from caprolactam is about 15,000 yuan; the price of butadiene is 8,000 yuan The cost of raw materials for the direct hydrocyanation of butadiene is about 11,000 yu.

In addition, the butadiene hydrocyanation method is only mastered by a few foreign companies such as INVISTA and Ascend, and China has not yet achieved independent producti.

Ammonia dehydration reaction is the key

The preparation of hexamethylene diamine from caprolactam needs to go through the following three-step reaction process: the first step is that caprolactam and ammonia gas undergo ammoniation ring-opening reaction to generate 6-aminocaproamide; Generate 6-aminocapronitrile; the third step is to hydrogenate 6-aminocapronitrile and hydrogen to obtain hexamethylenediami.

The first and second reactions are a continuous ammonia dehydration process, which is carried out in one reactor, and is currently the core of this technolo.

The reaction mechanism of caprolactam amination dehydration process is also complex, including the process of CN bond cleavage and formati.

Integration will exacerbate differentiation

At present, the newly put into production caprolactam production capacity has basically achieved cyclohexanone matching and raw material self-sufficiency, and the cost has also been greatly reduc.

In the next few years, there will be no caprolactam production enterprises supporting downstream nylon 6 polymerization, especially coal chemical enterprises in Shanxi, Henan, Shandong and other places that have newly increased production capacity after 201 Compared with integrated enterprises, in terms of profitability and comprehensive competitiveness weak.