Oxygen-poor nitrogen sealing method matched with styrene storage tank

Abstract

The invention discloses an oxygen-poor nitrogen sealing method matched with a styrene storage tank. The oxygen-poor nitrogen sealing method comprises the following steps: respectively feeding nitrogenand air into a pipeline type static gas mixer and fully mixing the nitrogen with the air into oxygen-poor nitrogen; feeding the oxygen-poor nitrogen into a self-operated gas pressure reducing valve to be subjected to pressure reduction to micro pressure and then feeding the oxygen-poor nitrogen into the styrene storage tank; and when the styrene storage tank is in a discharging state, feeding theoxygen-poor nitrogen into the styrene storage tank through the self-operated gas pressure reducing valve, detecting the pressure in the tank through a pressure detection pipe, and when the pressure in the tank reaches the micro pressure, stopping supplementing gas to the styrene storage tank by the self-operated gas pressure reducing valve. According to the oxygen-poor nitrogen sealing method, the problem that styrene is prone to polymerization in a storage process, and then a product goes bad is effectively solved, a certain amount of oxygen is fed into a polymerization inhibitor, so that the activity of the polymerization inhibitor is guaranteed, the storage time of the styrene is effectively prolonged, meanwhile, escape of styrene gas is reduced, and the environmental safety of a workshop and the personal safety of workers are guaranteed.

Description

technical field [0001] The invention relates to the technical field of styrene storage, in particular to an oxygen-poor nitrogen sealing method matched with a styrene storage tank. Background technique [0002] Styrene (Styrene, C8H8) is an organic compound formed by replacing one hydrogen atom of ethylene with benzene. The electrons of the vinyl group are conjugated with the benzene ring. It is insoluble in water, soluble in ethanol and ether, and gradually polymerizes and oxidation. Industrially, it is an important monomer of synthetic resin, ion exchange resin and synthetic rubber. In the prior art, the following three methods are usually used for the storage of styrene: 1. The nitrogen generator prepares nitrogen containing 95% nitrogen and supplies it to the styrene storage tank; 2. Nitrogen and air enter the styrene storage tank through independent pipelines , and control the flow ratio to realize the storage of styrene; 3. Use a gas proportioner to mix nitrogen and ...

AI Technical Summary

Problems solved by technology

[0003] However, the first method requires an additional purchased nitrogen generator (99.99% nitrogen) to supply the production line, raw material storage tanks, and finished product storage tanks, but only styrene storage tanks need oxygen-containing nitrogen, and the consumption is very small. A separate package will increase the cost of the nitrogen generator, and it is difficult to choose a suitable model, which will greatly increase the area of ​​the site; the second method is difficult to mix nitrogen and oxygen evenly, and the gas in the tank cannot be guaranteed after entering the styrene storage tank. The concentration is stable, and the oxygen concentration detector is generally installed on the top of the tank, which cannot represent the overall gas mixing state of the gas inside the tank; in the third method, the existing gas proportioner can only be used to clean a single component The gas is mixed and proportioned, because the air composition is complex, and the mixing ratio cannot be guaranteed, and the air prepared by the air compressor cannot guarantee the cleanliness required by the gas proportioner. For example, replacing the air with an oxygen cylinder will increase the production of the enterprise on the one hand. cost, on the one hand, it also increases the production area of ​​the workshop

Images