Safety production device and process for dimethyl sulfide oxidation reaction

Abstract

The invention relates to a safety production device and a safety production process for dimethyl sulfide oxidation reaction. A precise flowmeter, a material feeding adjustment valve and a stop valve are arranged on a nitrogen dioxide material feeding tube, an oxygen material feeding tube and a refined sulfur ether material feeding tube respectively; a tail gas emptying valve is arranged on the top of an oxidization tower; a detection device for measuring temperature and pressure is arranged in the oxidization tower; the detection device, the stop valve and the tail gas emptying valve are connected with a programmable logic control (PLC) interlocked protection system; and tail gas of the oxidization tower is fed into a neutralizing treatment device. The using amounts of nitrogen dioxide, oxygen and refined sulfur ether are strictly controlled; materials are fed according to a sulfur ether feeding flow amount of 300 to 400 kg / h, an oxygen feeding flow amount of 60 to 80 Nm<3> / h and a nitrogen dioxide feeding flow amount of 10 to 30 Nm<3> / h, and the materials are fed according to a sequence of nitrogen dioxide, oxygen and refined sulfur ether; and temperature of each tower section of the oxidization tower is controlled. According to the invention, excessive amount of sulfur ether is prevented effectively; oxidization reaction regions are concentrated and the reaction is complete and sufficient; and the safety production state of the oxidization tower is guaranteed.

Description

technical field [0001] The invention relates to a production device and process for oxidation reaction of dimethyl sulfide, belonging to the technical field of chemical production. Background technique [0002] The existing thioether oxidation process mainly contains the following steps: [0003] 1) Nitrogen dioxide vaporization process [0004] The liquid dinitrogen tetroxide stored in the raw material dinitrogen tetroxide storage tank is injected into the nitric oxide buffer tank through the nitric oxide pump through the control of the liquid level regulating valve and flow meter to control the liquid level of the nitric oxide buffer tank. The nitrogen buffer tank is fed with hot water to heat and vaporize the nitrogen tetroxide, and the pressure of the nitrogen oxide buffer tank is controlled through a pressure regulating valve, and the vaporized nitrogen dioxide gas is controlled and regulated by a regulating valve and measured by a metal tube float flowmeter Finally, ...

AI Technical Summary

Problems solved by technology

There is only one low-precision flow measuring instrument on the three material feeding pipelines of the oxidation tower. Once an error occurs and there is no other flow meter as a reference, it is difficult for the operator to judge the authenticity of the data display, which is very easy to cause Improper proportioning of the three materials resulted in excessive sulfide and accidents

[0018] 2) The sulfoxide plant has no reliable technical measures to prevent sulfide from entering the exhaust pipe

If excessive sulfide comes into contact with oxygen and enters into the oxidation tower tail gas pipeline to accumulate to a certain amount, it is very easy to cause an explosion accident

[0019] 3) The design of the feed distributor of the two materials in the oxidation tower is unreasonable: (the oxygen distributor is designed reasonably)

[0023] Existing problems: the distributor of sulfide is a straight-arm distributor, which starts to distribute close to the tower wall, and the surface is covered with distribution holes, so that the material distribution is not concentrated, and the sulfide diffuses to the surrounding and near the tower wall distribution, and under the action of the generated crude sulfoxide (sulfoxide has a large proportion and is extracted from the bottom of the tower), the liquid sulfide distributed near the tower wall tends to move downwards, thereby causing the position of the main oxidation reaction zone to move down, Thus endangering the safety of the oxidation tower

In short, the unconcentrated and unreasonable distribution effect will easily cause the position of the oxidation main reaction zone to be difficult to control, and at the same time make it difficult for the reaction materials to react completely

[0024] 4) The oxidation tower is more harmful, but it lacks a safety chain protection system, and also lacks reliable safety measures to quickly cut off the feed to the oxidation tower under abnormal circumstances

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