Regeneration method of palladium catalyst for hydrogenation reaction

Abstract

The invention relates to a regeneration method of a palladium catalyst for hydrogenation reaction. The regeneration method comprises the following steps: material returning, aromatic hydrocarbon washing, steam washing, hot water washing, nitrogen purging, air inactivating, out-tower washing, reloading, nitrogen drying, activating and aromatic hydrocarbon softening. Steam is sprayed to a palladium catalyst bed through a regenerated-steam sparger arranged on an upper portion of a hydrogenation tower. The palladium catalyst bed is loaded with a layer of inert balls, a layer of a steel mesh, a layer of a palladium catalyst, a layer of supporting balls and a layer of a steel mesh from up to down. According to the invention, the aromatic hydrocarbon washing process and the steam washing process are added before the steam washing process, and the hot water washing process and the out-tower washing process are added after the steam washing process, so that impurities absorbed on palladium catalyst balls can be sufficiently dissolved and removed, and ceramic balls and catalyst residues in the palladium catalyst can be removed. Though the regeneration method, regeneration effect is improved and regeneration activity of the palladium catalyst is enhanced. By carrying out aromatic hydrocarbon softening treatment to an activated palladium catalyst, activity of the catalyst is further improved, which is beneficial for optimizing hydrocarbon reaction operation and prolonging service life of the palladium catalyst.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to a palladium catalyst regeneration method, in particular to a hydrogenation reaction palladium catalyst regeneration method. Background technique [0002] The production of hydrogen peroxide by anthraquinone method is based on 2-ethylanthraquinone and tetrahydro-2-ethylanthraquinone as carriers, and trioctyl phosphate and heavy aromatics as solvents to prepare working fluid. The process includes palladium catalyst fixed-bed hydrogenation, empty tower Oxidation, sieve tray extraction and post-treatment of circulating working fluid. The hydrogenation tower is the main equipment for the production of hydrogen peroxide. The hydrogenation reaction is that hydrogen and working fluid flow downward in the hydrogenation reactor equipped with a palladium catalyst bed. After a certain period of operation of the hydrogenation tower, the activity of the palladium catalyst is reduced...

AI Technical Summary

Problems solved by technology

[0003] The problems existing in the steam regeneration method in the prior art are: ①Washing in the tower with a small flow of hot water, the hot water is biased in the tower, and the regeneration effect is poor

② After the palladium catalyst is regenerated, the nitrogen is dried, the nitrogen consumption is large, and the drying effect is not good, which affects the activity of the palladium catalyst

③The regenerated palladium catalyst and inert ceramic balls in the tower cannot be sieved after being mixed, and the palladium catalyst and inert ceramic balls are rubbed during use, resulting in a large loss

④ The pulverized palladium catalyst in production cannot be screened and removed, resulting in an increase in bed pressure difference and affecting the hydrogenation reaction

This patent can prolong the service life of the palladium catalyst and reduce the production cost, but this patent requires roasting in a roaster, adding regeneration equipment and regeneration procedures

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