Method for preparing organic diamine from organic amide and device thereof

Abstract

The invention provides a method for preparing organic diamine from organic amide and a device thereof, and the method comprises the following steps: (1) mixing and gasifying ammonia gas and organic amide to obtain a gasified material; carrying out ammoniation reaction on the gasified material under the action of an ammoniation catalyst to obtain a first reaction material; (2) carrying out first refining and first adsorption on the first reaction material to obtain an aminonitrile organic matter; (3) performing a hydrogenation reaction on the aminonitrile organic matter and hydrogen under the action of a hydrogenation catalyst, and obtaining a reacted material containing organic diamine; and (4) sequentially carrying out secondary refining and secondary adsorption on the reacted material to obtain an organic diamine product. According to the method, the organic amide is converted into the aminonitrile organic matter through the gas phase method, the aminonitrile organic matter is purified and then converted into the organic diamine through hydrogenation, the process is simple and easy to control, the yield and selectivity of the final organic diamine can be remarkably improved, and the economic benefits of the whole process are improved.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a method and a device for preparing organic diamines from organic amides. Background technique [0002] Hexamethylenediamine is a key raw material in the nylon industry. It is often used to synthesize nylon 66 and nylon 610, and then to make nylon resin, nylon fiber and engineering plastics and other products. The industrial production method of hexamethylenediamine is mainly the catalytic hydrogenation of adiponitrile, which produces diaminocyclohexane, an impurity that has a great impact on the quality of nylon products, and is difficult to separate when producing hexamethylenediamine. At present, with the increasing capacity of caprolactam and the decreasing price, the caprolactam method is expected to be promoted industrially. The caprolactam method uses caprolactam as a raw material to obtain 6-aminocapronitrile through catalytic amination, and then further cataly...

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Problems solved by technology

The caprolactam method uses caprolactam as a raw material to obtain 6-aminocapronitrile through catalytic amination, and then further catalyzes hydrogenation of 6-aminocapronitrile to obtain hexamethylenediamine. This method avoids the generation of diaminocyclohexane from the source and improves the Hexamethylenediamine product quality, but there are problems such as complicated process, long route and low conversion rate of raw materials, and the cost of large-scale production is high

[0003] CN111574400A discloses a method for separating the ammoniated dehydration product of caprolactam. In the separation method, the ammoniated dehydration product system is directly condensed without secondary heating, and continuous operation of reaction and product separation can be realized, and waste heat can be fully utilized. High separation efficiency, high production intensity and low separation energy consumption make the overall process more energy-saving; but this method is difficult to obtain high-purity 6-aminocapronitrile, which will affect the subsequent synthesis of hexamethylenediamine

[0005] CN112812020A discloses a method and device thereof for producing hexamethylenediamine from caprolactam. The method utilizes caprolactam aqueous solution as the diluent for the hydrogenation reaction of 6-aminocapronitrile, and does not need to add ethanol as the diluent, which reduces the generation of by-products, but After the method introduces water, the energy consumption is high, and the economic benefit is relatively poor.

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