Method for recovering and recycling sodium bromide from diethylbutylmalonate waste water

Abstract

The invention relates to a method for recovering and recycling sodium bromide from diethylbutylmalonate waste water. The method comprises the following steps of: sending waste water which is generated in a production process of diethylbutylmalonate and contains sodium bromide into an evaporator, and introducing steam into the evaporator to ensure that water in the waste water is evaporated out by using the steam; when the waste water is evaporated and concentrated to the condition that residual water accounts for 8-12 percent of the weight of the sodium bromide, sending an obtained concentrated solution into a cooling pot for cooling to obtain a solid sodium bromide crystalline hydrate; and sending the solid sodium bromide crystalline hydrate to an industrial production line of the diethylbutylmalonate for recycling by using the solid sodium bromide crystalline hydrate as a raw material. The invention provides the method for recovering the solid sodium bromide crystalline hydrate from the waste water generated in the production process of the diethylbutylmalonate and for recycling and producing the diethylbutylmalonate by using the solid sodium bromide crystalline hydrate as a raw material. When the method is used for recovering the sodium bromide, the method has low recovery cost and high recovery rate; meanwhile, the production cost of the diethylbutylmalonate is also greatly reduced.

Description

technical field [0001] The invention relates to a method for recycling sodium bromide from waste water of n-butyl diethylmalonate. Background technique [0002] A large amount of waste water is produced in the production process of n-butyl diethyl malonate, and the waste water contains a large amount of sodium bromide. Specifically, every ton of n-butyl diethyl malonate produced will produce waste water containing 0.5 ton of sodium bromide, which is a necessary raw material for the production of n-butyl diethyl malonate. If this waste water is discharged, it will not only pollute the environment, but also cause a waste of available resources and increase production costs. There is also a process for recovering sodium bromide from n-butyl diethylmalonate wastewater at present. But in these processes, the process of recovering sodium bromide is too complicated, and the recovery process not only includes recovering sodium bromide from waste water, but also carries out purific...

AI Technical Summary

Problems solved by technology

But in these techniques, the technique of reclaiming sodium bromide is too complicated, not only includes reclaiming sodium bromide from waste water in the recovery process, also it has been carried out treatment such as purification, decolorization, makes recovery cost increase greatly like this, and will be more expensive Greatly reduce the recovery rate of sodium bromide, which also greatly increases the cost of recovery and the use cost of further recycling

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