Coagulation method and equipment for halogenated butyl rubber

Abstract

The invention relates to a coagulation method of halogenated butyl rubber, which belongs to the technical field of butyl rubber synthesis. After the butyl rubber glue has undergone a halogenation reaction, and then undergoes a neutralization reaction, it enters the first coagulation kettle, and hot water is also passed into the first coagulation kettle, so that the first gas phase containing hexane is generated in the first coagulation kettle. The first gas phase is condensed by the condenser and then enters the hexane purification system for treatment; the colloidal water in the first coagulation tank is sent to the second coagulation tank through the first delivery pump, so that the second gas phase containing hexane is produced in the second coagulation tank, The second gas phase is extracted from the second condensation tank by the first water ring vacuum pump, condensed by the condenser, and then enters the hexane purification system for treatment. Using a mechanical heat pump to recycle the steam waste heat at the top of the first condensation tank will not only reduce the steam consumption in the production process of halogenated butyl, but also reduce the amount of circulating water used for condensing steam.

Description

technical field [0001] The invention relates to a coagulation method of halogenated butyl rubber, which belongs to the technical field of butyl rubber synthesis. Background technique [0002] Coagulation is an important step in the production of halobutyl rubber. It is the operation of removing hexane by neutralizing and adding additives to the coagulation tank after neutralizing the glue generated by the polymerization reaction. It also facilitates subsequent dehydration. In the prior art, the coagulation usually adopts a three-pot differential pressure process, and the second and third coagulation pots need to maintain a relatively low pressure to ensure the removal of hexane. The existing process uses a steam jet pump as a vacuum device to maintain the lower pressure of the second and third condensation tanks, and the steam medium and the pumped hexane-containing gas are returned to the first condensation tank to replenish the first condensation tank. Steam, thereby re...

AI Technical Summary

Problems solved by technology

[0003] The main problems of adopting the above scheme are: ① high energy consumption, due to the low injection efficiency of the steam jet pump, a large amount of low-pressure steam needs to be consumed to maintain the low pressure of the second and third condensation kettles; ② high material consumption, due to the low pressure of the second 2. The hexane-containing gas sucked by the third condensation tank needs to be returned to the first condensation tank, which obviously increases the load of the first condensation tank to remove hexane

In addition, the system adopts a process of connecting three kettles in series. The second and third coagulation kettles have similar functions. When one of the equipment is abnormal due to mechanical failure or process fluctuation, the whole line must be shut down for processing, and the flexibility of the device is very poor.

Images