A kind of technology that improves bromine utilization rate in bromobutyl rubber

Abstract

The invention provides a process for improving the utilization rate of bromine in brominated butyl rubber, and completes the recovery and reuse of bromine through waste water purification, distillation, crude bromine reuse and tail gas recovery. Specifically, through distillation and tail gas treatment, the recovery rate of bromine is increased to more than 94%, and crude bromine with a purity of 98% is obtained by distillation, which meets the actual production demand and is directly seamlessly connected with bromobutyl production without further rectification, effectively reducing energy consumption. Consumption and cost saving, the bromine ion content of the external drainage is less than 400ppm, which meets the environmental protection requirements; the tail gas treatment will return the bromine vapor in the non-condensable gas produced by distillation to the bromine recovery device to continue to recover bromine and avoid the discharge of bromine. Through the above process, the utilization rate of bromine in the production of butyl rubber has increased from the original 45-50% to over 95%, which can effectively reduce the efflux of bromide ions, greatly reduce the production cost of brominated rubber, and reduce the cost of sewage treatment .

Description

technical field [0001] The invention belongs to the technical field of brominated butyl rubber, and in particular relates to a process for improving the utilization rate of bromine in brominated butyl rubber. Background technique [0002] The basic principle of bromobutyl rubber is that liquid bromine reacts with butyl rubber to produce bromobutyl rubber. The reaction process of butyl rubber bromination is a substitution reaction, that is, Br 2 +Butyl rubber→HBr+Bromobutyl rubber, the theoretical maximum effective utilization rate of bromine atoms in this reaction is not more than 50%, and the utilization rate of bromine atoms in the production process of brominated rubber is only 45%-50%, half The above bromine atoms do not enter the product rubber, but exist in water in the form of bromide ions. If the waste water is discharged directly, it will cause serious pollution to the environment and cause a waste of resources. Therefore, the treatment of the waste water not only...

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Problems solved by technology

This invention effectively improves the utilization rate of bromine, but requires a large number of condensation and rectification equipment. The three-stage rectification and purification of crude bromine will cause large energy consumption and complicated operation. At the same time, the rectification of bromine will bring risks such as bromine leakage. , need to increase safety investment; in addition, the treatment of non-condensable gas in multiple devices is not thorough enough, only the brine is recovered and the liquid is reused for distillation, and the gas is emptied from the top of the recovery tower, and the bromine vapor that may be carried will also be discharged, which affects the environment , causing waste

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