A regeneration method for phenol hydrogenation pd@cn catalyst

Abstract

The invention relates to a regeneration method of a phenol hydrogenation Pd@CN catalyst. After the hydrogenation of phenol was catalyzed by the Pd@CN catalyst, the catalyst was recovered by filtration, placed in a reaction kettle, added a solvent, washed under certain conditions to regenerate the catalyst, and filtered again for the next experiment. The regeneration method can effectively regenerate the deactivated catalyst, realize the recycling of the catalyst, reduce the usage amount of the catalyst, improve the economy of the process, and provide guarantee for the green production process of cyclohexanone from phenol hydrogenation.

Description

technical field [0001] The invention relates to a regeneration method of a Pd@CN catalyst, in particular to a regeneration method of a Pd@CN catalyst in a high-concentration phenol hydrogenation process, and belongs to the technical field of catalysis. Background technique [0002] The downstream products of cyclohexanone, caprolactam and adipic acid, are important intermediates for the synthesis of nylon 6 and nylon 66. The main production process of cyclohexanone in industry is the cyclohexane oxidation method, but this method has many by-products, more acid-containing wastewater, and greater environmental pollution. In recent years, the one-step hydrogenation of phenol to cyclohexanone has attracted much attention due to its short process flow and high atom utilization. [0003] The patent (publication number 104402687A) applied Pd@CN catalyst to phenol hydrogenation and developed a new phenol hydrogenation process. However, the concentration of phenol in this process is...

AI Technical Summary

Problems solved by technology

[0003] The patent (publication number 104402687A) applied Pd@CN catalyst to phenol hydrogenation, and developed a new phenol hydrogenation process, but the concentration of phenol in this process is low, and the economic benefit is too low in the industrialization process

The patent (publication number 106861741A) increases the concentration of phenol, studies the hydrogenation process of phenol with water as the solvent under the concentration of 10% phenol, and develops a post-treatment method of phenol hydrogenation catalyst, which can solve the problem of 10% hydrogenation in the water system. % phenol concentration deactivation of Pd@CN catalyst, but as the phenol concentration continues to increase, the aqueous system is no longer suitable for the phenol hydrogenation process

Studies have shown that the hydrogenation process of high-concentration phenol shows better catalytic activity in the solvent cyclohexane, but the deactivation of the catalyst inevitably occurs, mainly due to the high concentration of organic matter in the hydrogenation process of high-concentration phenol, the organic matter Easier to block catalyst pores (most micropores), cover active sites, and limit mass transfer

Images