Method for resource utilization of hexamethylenediamine key intermediate reaction residues

Abstract

The invention relates to a method for resource utilization of hexamethylenediamine key intermediate reaction residues. The method comprises the following steps: adding residues and water into a reaction kettle or a fixed bed reactor, and carrying out depolymerization reaction; and sequentially carrying out negative pressure dehydration and negative pressure distillation on the obtained depolymerization reaction solution, and collecting fractions to obtain aminocapronitrile and caprolactam. The process method is optimized in design and simple in operation, the hexamethylenediamine key intermediate reaction residues are subjected to efficient, green and environment-friendly recovery treatment, the problem of residue pollution in existing hexamethylenediamine production is well solved, resource utilization of residue solid waste is achieved, the recycled caprolactam and aminocapronitrile can be reused as raw materials for preparing hexamethylenediamine, and thus the method reduces pollution, enhances environmental protection, reduces production cost, improves economic benefits and is suitable for application and popularization in related industrial fields.

Description

technical field [0001] The invention relates to the technical field of organic chemical industry, in particular to a method for resource utilization of the reaction residue of a key intermediate of hexamethylenediamine, which is especially suitable for recovering caprolactam and aminocapronitrile. Background technique [0002] Hexamethylenediamine (CAS No. 124-09-4) is widely used, mainly used in the production of nylon 66. Nylon 66 is the earliest polyamide to realize the industrialization mark. It is listed as the most important two polyamide material categories together with nylon 6, and it is used in polyimide carboxylate foam, polyurethane foam, coating, epoxy resin curing agent, There are also a large number of applications and developments in organic crosslinking agents, pesticides, iron ore and copper ore flotation agents. Hexamethylenediamine is a very important organic raw material in the field of chemical production, and the research and development of its produc...

AI Technical Summary

Problems solved by technology

In caprolactam ammonification process, caprolactam and aminocapronitrile inevitably polymerize to form polymers during the reaction and post-treatment process, and finally form residue solid waste, which pollutes the environment and also has a certain impact on production efficiency and product quality

[0004] Patent CN1167483A discloses a preparation method of caprolactam, the method is in the presence of a heterogeneous catalyst and an organic solvent, in the liquid phase by cracking oligomers or polymers at high temperature and in the presence of a catalyst to prepare caprolactam; The advantage of the method is that it does not need to consume energy to separate a large amount of water and remove the catalyst, but the catalyst preparation process is complicated and the reaction conditions are harsh