Iron cobalt composite carbon copper catalyst for continuous production of 4,4-diaminodiphenyl ether as well as method

Abstract

The invention discloses an iron cobalt composite carbon copper catalyst for continuous production of 4,4-diaminodiphenyl ether as well as a method. The catalyst takes carbon coated foam copper as a carrier and loads Fe, Co and noble metal; and the mass contents of the Fe, the Co and the noble metal in the catalyst are sequentially 0.1 to 1.0 percent, 0.1 to 0.8 percent and 0.1 to 0.9 percent. The4,4-diaminodiphenyl ether is continuously produced by adopting the iron cobalt composite carbon copper catalyst, by taking 4,4-dinitrodiphenyl ether as a raw material and by performing nitro hydrogenation reaction on a catalyst bed by a trickle bed, the catalytic reaction efficiency is high, the reaction heat is concentrated, the carbon coated foam copper carrier can disperse the active componentsof the catalyst well, also can rapidly remove reaction heat and guarantees that the reaction is conducted within the proper temperature range rapidly and stably, the raw material conversion rate is 100 percent, the selectivity of target products is more than 99.9 percent, the catalyst property is stable, the catalytic reaction is too simple the catalytic reaction heat is recoverable, the heat energy utilization efficiency is high, and environmental friendliness is realized.

Description

technical field [0001] The invention belongs to the technical field of catalytic hydrogenation, and in particular relates to an iron-cobalt composite carbon-copper catalyst and a method for continuously producing 4,4-diaminodiphenyl ether by using the catalyst. Background technique [0002] 4,4-Dinitrodiphenyl ether is a high value-added fine chemical intermediate. Its reduction product 4,4-diaminodiphenyl ether is the main monomer for the synthesis of heat-resistant plastics such as polyimide and polymaleimide, among which polyimide has high temperature resistance, radiation resistance and high mechanical strength. Advantages, used in films, coatings, fibers, foam plastics and photoresists, etc., widely used in aviation, navigation, atomic energy, electronic and electrical industries and other fields. 4,4-diaminodiphenyl ether is one of the main raw materials of polyimide. At the same time, 4,4-diaminodiphenyl ether can also be used to produce crosslinking agents, and is w...

AI Technical Summary

Problems solved by technology

Moreover, the existing post-treatment process of 4,4-dinitrodiphenyl ether is precipitation by adding water, resulting in a large amount of waste water

[0003] Chinese patent 201810861785.X discloses a method for synthesizing 4,4-diaminodiphenyl ether. The method uses alcohols as solvents and diphenyl ether as the initial raw material to form nitroso intermediates through nitration reaction, and then Catalytic hydrogenation greatly reduces the amount of hydrogen used and the difficulty of the catalytic reaction, but due to the intermittent tank technology, there are still problems of incomplete conversion and low yield at high temperature and pressure

Chinese patent 201711478222.4 discloses a preparation method of 4,4-diaminodiphenyl ether, the method adopts kettle technology, the reaction pressure is low, but the temperature is high, and the yield of product 4,4-diaminodiphenyl ether More than 99%, the catalyst is 5% Pd / C, the cost of the catalyst is high, and the time required for the catalytic reaction to reach a conversion rate of more than 99% is long

At present, the industry still adopts the still-type process to produce 4,4-diaminodiphenyl ether, which has low efficiency and high cost. Therefore, it is necessary to improve production efficiency and reduce production costs. Fixed-bed continuous technology can realize the energy saving and reduction of catalytic hydrogenation reaction. Consumption, improve product quality, save production costs