Preparation method of bi-(2-ethylhexyl)

Abstract

The invention discloses a preparation method of bi-(2-ethylhexyl), mainly comprising the following steps of: adding 2-ethylhexanol, ammonia, hydrogen and a catalytic agent in a high-pressure reaction kettle and stirring at high speed; carrying out catalysis and amination reaction at the temperature of 120-260 DEG C to prepare a mixture containing2-ethylhexylamine, 2-ethylhexanol and bi-(2-ethylhexyl); continuously carrying out condensation deamination reaction on the mixture in a hydrogen atmosphere to obtain a reactant taking bi-(2-ethylhexyl) ammonia as the main component, wherein the product selectivity is higher than 90 percent, and then rectifying to obtain the bi-(2-ethylhexyl), wherein the purity of the bi-(2-ethylhexyl) is higher than 99 percent. The bi-(2-ethylhexyl) prepared by the method is mainly used for the synthesis of high-grade lubricant oil extreme-pressure antiwear agents.

Description

technical field

[0001] The invention relates to a preparation method of di(2-ethylhexyl)amine. Background technique

[0002] Di(2-ethylhexyl)amine is a synthetic intermediate of high-grade lubricating oil extreme pressure anti-wear agent. With the development of domestic high-grade lubricating oil industry, the demand for it increases rapidly; 2-ethylhexanol and Ammonia is used as a raw material. First, 2-ethylhexanonitrile is generated under the action of a catalyst, and 2-ethylhexylamine is obtained through hydrogenation catalysis, and the pure product is obtained through rectification, and then deaminated under the action of a catalyst to generate bis(2-ethylhexylamine). Base hexyl) amine, this method step is numerous and diverse, and product yield is low. Contents of the invention

[0003] The purpose of the invention is to provide a method for preparing di(2-ethylhexyl)amine with simple process and high product yield.

[0004] In order to achieve the above object, t...

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