Oxygen removing method of butadiene refining device

Abstract

The deoxygenation method of the butadiene refining unit is to add a deoxygenation system before the crude butadiene raw material enters the water washing tower, and a certain concentration of NaNO 2 The aqueous solution is continuously pumped into the washing tower with a metering pump to ensure a certain amount of NaNO in the washing tower. 2 Solution concentration, the free oxygen in the raw material is removed by the sufficient contact between the washing water and the material in the water washing tower. NaNO in washing tower 2 The concentration of the solution is controlled so that the aqueous solution can effectively remove the oxygen in the raw material without causing pollution to the subsequent system. The method of the present invention effectively eliminates the oxygen brought into the refining device in the raw material of crude butadiene, and will greatly slow down the formation speed of the terminal polymer in the light removal tower and the weight removal tower, and may gradually disappear, greatly prolonging the operation of the refining device cycle. It will reduce the loss of butadiene caused by venting and deoxygenating the top reflux tank of the original light removal tower.

Description

technical field [0001] The invention belongs to a method for deoxidizing raw materials of a butadiene refining device. Background technique [0002] The raw material crude butadiene enters the water washing tower to remove oxygen-containing compounds such as acetonitrile, dimers, aldehydes and ketones, and then removes carbon triyne and water through the light removal tower, and separates the heavy components through the weight removal tower, and finally obtains qualified polymer Grade butadiene, used as raw material for butadiene rubber production. [0003] The raw materials of the butadiene refining unit are butadiene produced by acetonitrile extraction, butadiene recovered by the polymerization unit, and butadiene mixture purchased from outside. The oxygen content in the recovered butadiene is relatively high, and the oxygen content of the gas phase detection is 3-7%. , The oxygen content in the raw material has a great influence on the self-...

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Problems solved by technology

[0004] At present, the free oxygen in the butadiene refining unit is mainly removed by venting the top reflux tank of the light removal tower. Under normal circumstances, the venting volume is about 30Nm 3 / hr, while the oxygen content in the gas phase of the reflux tank generally does not exceed 1%, that is to say, what is released is mainly butadiene, and the materials in the light removal tower have not been deaerated, and the materials entering the deheavy tower cannot be completely deoxygenated, resulting in Terminal polymer formation, equipment blockage, it is necessary to find a suitable oxygen removal method to reduce the loss of butadiene in the vent, and completely remove the oxygen in the raw material

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