Wet-dry process compounded technology for regenerating and recovering waste and old copper-bismuth catalyst

Abstract

The invention provides a wet-dry process compounded technology for regenerating and recovering a waste and old copper-bismuth catalyst. The technology comprises following steps: slurry conveying, activating, catalyst regenerating and recovering, and flue gas processing. A wet process and a dry process are combined to regenerate and recover catalysts, an activation furnace is used in the activatingstep, and a catalyst is generated by a dry process at a high temperature. In the catalyst regenerating and recovering step, a grading-recovering device is adopted to recover catalysts by a wet process, and catalyst slurry is formed. In flue gas processing step, a high temperature flue gas dedusting-purifying integrated device is used to remove harmful components in flue gas such as oxynitride, sulfides, and the like; purified flue gas is introduced into a heat exchanger to recover the heat energy; then part of flue gas is introduced into the activation furnace to improve the efficiency of theactivation furnace, energy is saved; the other part of flue gas is washed by a washer, then mercury of the flue gas is removed by a mercury removing adsorber, finally flue gas is heated by the heat exchanger and then discharged, white flue gas is eliminated, whole technology is efficient and energy saving, and no wastewater is discharged.

Description

technical field [0001] The invention relates to the technical field of chemical hazardous waste treatment, in particular to a dry-wet composite regeneration process for recovering waste copper-bismuth catalysts. Background technique [0002] The copper-bismuth catalyst used in the alkyne aldehyde reaction in the BDO industry has reduced activity during use due to mechanical wear, excessive surface deposits, loss of copper ions, and carrier shedding. A large cost of about 20 million yuan is incurred, and about 800-1,000 tons of spent catalyst slurry are replaced, which are treated as hazardous waste, and the treatment cost is about 800,000 yuan. Copper acetylene, the main component of spent catalyst, is an explosive substance, and it is difficult to go through transportation procedures in different places. If it is parked on site for a long time, spontaneous combustion and leakage will occur, causing serious pollution to the environment and posing safety hazards. Therefore, ...

AI Technical Summary

Problems solved by technology

[0002] The copper-bismuth catalyst used in the alkyne aldehyde reaction in the BDO industry has reduced activity during use due to mechanical wear, excessive surface deposits, loss of copper ions, and carrier shedding. A large cost of about 20 million yuan will be incurred, and the replaced spent catalyst slurry will be about 800-1000 tons, which will be treated as hazardous waste at a cost of about 800,000 yuan

The main component of spent catalyst is copper acetylene, which is an explosive substance, and it is difficult to go through transportation procedures in other places. If it is parked on site for a long time, spontaneous combustion and leakage will occur, causing serious pollution to the environment and posing safety hazards.

Images