Dimethyl sulfide oxidation system

Abstract

The utility model belongs to the technical field of dimethyl sulfoxide production, and particularly relates to a dimethyl sulfide oxidation system. The system comprises a raw material buffer tank, a liquid-phase material buffer tank connected with feeding pumps, two liquid-phase feeding pumps connected with a liquid-phase mixer, a gas-phase buffer tank connected with a gas mixer, the mixer connected with a micro-reactor, a condenser connected with an outlet of the micro-reactor, a gas-liquid separator connected with an outlet of the condenser, and a gas-liquid separator connected with the gas-liquid separator. A gas phase outlet of the gas-liquid separator is connected with the tail gas treatment system, and a liquid phase outlet is connected with the product buffer tank. The utility model has the beneficial effects that the system has low requirements on equipment, is easy to industrialize, has high continuity and automation degree, is simple to operate and easy to control, can be monitored in real time, and is convenient to apply and popularize.

Description

TECHNICAL FIELD

[0001] The utility model belongs to dimethyl sulfoxide production technical field, especially relates to a dimethyl sulfide oxidation system. BACKGROUND

[0002] Dimethyl sulfoxide (DMSO) is a kind of sulfur-containing organic compound, with high polarity, high boiling point, good thermal stability, non-protic, and water-miscible characteristics, can be dissolved in ethanol and benzene and most of the organic matter, it is the most powerful organic solvent, is known as "universal solvent". Dimethyl sulfoxide has very wide application in national defense, textile, chemical industry, medicine, electronic information, carbon fiber and other fields. At present, dimethyl sulfoxide is mainly prepared by catalytic oxidation of dimethyl sulfide, using nitrogen oxide as reaction catalyst, and the current continuous production of dimethyl sulfoxide is usually carried out in tower. Since the boiling point of dimethyl sulfide is only 38 DEG C, it is easy to vaporize, and the explosion limit is 2.2%-19.7%, therefore, the current oxidation tower process has the risk of insufficient sulfide reaction and explosion when entering the gas phase space of tower top. How to control the reaction degree in oxidation tower to ensure the safety of oxidation process is the key step of dimethyl sulfoxide production. SUMMARY

[0003] In view of the above oxidation process safety risk control, the utility model provides a kind of dimethyl sulfide oxidation system, its technical scheme is: including dimethyl sulfoxide buffer tank and dimethyl sulfoxide feeding pump are connected, dimethyl sulfide buffer tank and dimethyl sulfide feeding pump are connected, dimethyl sulfoxide feeding pump and dimethyl sulfide feeding pump outlet pipeline are connected with liquid mixer, oxygen buffer tank and oxidation nitrogen buffer tank outlet pipeline are connected with gas mixer, the feed inlet of microreactor is connected respectively by liquid mixer and gas mixer, the outlet of microreactor is connected with condenser, the outlet of condenser is connected with gas-liquid separator, the gas phase outlet of gas-liquid separator is connected with tail gas treatment system, the liquid phase outlet of gas-liquid separator is connected with dimethyl sulfoxide buffer tank. The bottom liquid phase outlet of gas-liquid separator is connected with storage tank.

[0004] The outlet pipeline of dimethyl sulfoxide feeding pump and dimethyl sulfide feeding pump is connected with liquid mixer through three-way connection.

[0005] The outlet pipeline of oxygen buffer tank and oxidation nitrogen buffer tank is connected with gas mixer through three-way connection.

[0006] The liquid mixer and gas mixer are connected with different feed inlets of microreactor respectively.

[0007] The microreactor is connected with condenser, and the outlet of condenser is connected with gas-liquid separator.

[0008] The gas phase outlet of gas-liquid separator is connected with tail gas treatment system, and the liquid phase outlet is connected with dimethyl sulfoxide buffer tank.

[0009] As a preferred solution, the dimethyl sulfoxide feeding temperature is 20-60 DEG C, and the dimethyl sulfide feeding temperature is 5-30 DEG C.

[0010] As a preferred solution, the dimethyl sulfoxide and dimethyl sulfide feeding flow ratio is 10-25, and the oxygen and nitrogen oxide feeding flow ratio is 5-10.

[0011] As a preferred solution, the condenser water inlet temperature is 24-28 DEG C, the dimethyl sulfoxide buffer tank temperature is controlled to 20-30 DEG C, and the dimethyl sulfide buffer tank temperature is controlled to 5-10 DEG C.

[0012] The utility model discloses the beneficial effect:

[0013] The system is low in equipment requirement, easy to industrialize, high in continuity and automation degree, simple to operate, easy to control, can monitor in real time and is convenient for application and promotion. DRAWINGS

[0014] Figure 1 It is the whole structure schematic diagram of the utility model.

[0015] In the drawing: dimethyl sulfoxide buffer tank 1, dimethyl sulfoxide feeding pump 2, dimethyl sulfide buffer tank 3, dimethyl sulfide feeding pump 4, liquid mixer 5, oxygen buffer tank 6, nitrogen oxide buffer tank 7, gas mixer 8, microreactor 9, condenser 10, gas-liquid separator 11, tail gas treatment system 12. PREFERRED EMBODIMENT

[0016] The utility model will be described in further detail below in connection with the drawings and specific embodiments.

[0017] Example 1

[0018] A dimethyl sulfide oxidation system, comprising a dimethyl sulfoxide buffer tank connected with a dimethyl sulfoxide feeding pump, a dimethyl sulfide buffer tank connected with a dimethyl sulfide feeding pump, an outlet pipeline of the dimethyl sulfoxide feeding pump and the dimethyl sulfide feeding pump connected with a liquid mixer, an outlet pipeline of an oxygen buffer tank and a nitrogen oxide buffer tank connected with a gas mixer, the liquid mixer and the gas mixer connected with the feeding port of a microreactor respectively, the outlet of the microreactor connected with a condenser, the outlet of the condenser connected with a gas-liquid separator, the gas phase outlet of the gas-liquid separator connected with a tail gas treatment system, and the liquid phase outlet of the gas-liquid separator connected with the dimethyl sulfoxide buffer tank. The bottom liquid phase outlet of the gas-liquid separator is connected with a storage tank.

[0019] The outlet pipeline of the dimethyl sulfoxide feeding pump and the dimethyl sulfide feeding pump is connected with the liquid mixer through a three-way joint.

[0020] The outlet pipeline of the oxygen buffer tank and the nitrogen oxide buffer tank is connected with the gas mixer through a three-way joint.

[0021] The liquid mixer and the gas mixer are connected to different feed ports of the microreactor, respectively.

[0022] The microreactor is connected to a condenser, and the outlet of the condenser is connected to a gas-liquid separator.

[0023] The gas phase outlet of the gas-liquid separator is connected to a tail gas treatment system, and the liquid phase outlet is connected to a dimethyl sulfoxide buffer tank.

[0024] Further, the dimethyl sulfoxide feeding temperature is 20-60℃, and the dimethyl sulfide feeding temperature is 5-30℃.

[0025] Further, the condenser inlet water temperature is 24-28℃, the dimethyl sulfoxide buffer tank temperature is controlled at 20-30℃, and the dimethyl sulfide buffer tank temperature is controlled at 5-10℃.

[0026] Further, the dimethyl sulfoxide and dimethyl sulfide feeding flow rate ratio is 10-30.

[0027] Further, the oxygen and nitrogen oxide feeding flow rate ratio is 5-10.

[0028] Example 2

[0029] The system described in Example 1 is used, and the operation process is as follows: dimethyl sulfide and dimethyl sulfoxide enter the liquid mixer through the feeding pump, are mixed uniformly, and then are mixed with the oxygen and nitrogen dioxide mixed gas mixed uniformly in the gas mixer in the microchannel reactor to perform reaction, the dimethyl sulfoxide and dimethyl sulfide flow rate ratio is controlled at 27, and the feeding temperature is 40℃. The generated dimethyl sulfoxide crude product and nitrogen oxide tail gas enter the condenser for cooling, and then are separated through the gas-liquid separator, the liquid phase enters the dimethyl sulfoxide buffer tank, and the gas phase enters the tail gas treatment device. The experimental conditions and test results are shown in Table 1.

[0030] Table 1 Experimental conditions and test results

[0031] Serial number Dimethyl sulfoxide Dimethyl sulfide Dimethyl sulfone Dimethyl sulfoxide flow (kg / h) Dimethyl sulfide flow (kg / h) Oxygen flow (kg / h) Nitric oxide flow (kg / h) Feed temperature °C 1 96.81 0.02 3.17 202.21 7.23 2.11 0.57 40 2 96.79 0.02 3.19 207.87 7.59 2.14 0.57 40 3 97.16 0.01 2.83 205.92 7.56 2.08 0.47 40 4 97.10 0.03 2.87 204.11 7.65 2.15 0.49 40

Claims

1. A dimethyl sulfide oxidation system characterized by, The dimethyl sulfoxide buffer tank (1) is connected with a dimethyl sulfoxide feeding pump (2), the dimethyl sulfide buffer tank (3) is connected with a dimethyl sulfide feeding pump (4), the outlet pipelines of the dimethyl sulfoxide feeding pump (2) and the dimethyl sulfide feeding pump (4) are connected with a liquid mixer (5), the outlet pipelines of an oxygen buffer tank (6) and a nitrogen oxide buffer tank (7) are connected with a gas mixer (8), the liquid mixer (5) and the gas mixer (8) are respectively connected with the feeding inlets of a micro-reactor (9), the outlet of the micro-reactor (9) is connected with a condenser (10), the outlet of the condenser (10) is connected with a gas-liquid separator (11), the gas phase outlet of the gas-liquid separator (11) is connected with a tail gas treatment system (12), and the liquid phase outlet of the gas-liquid separator (11) is connected with the dimethyl sulfoxide buffer tank (1).

2. A dimethyl sulfide oxidation system as claimed in claim 1, wherein, The outlet pipelines of the dimethyl sulfoxide feeding pump (2) and the dimethyl sulfide feeding pump (4) are connected with the liquid mixer (5) through a three-way joint.

3. A dimethyl sulfide oxidation system as claimed in claim 1, wherein, The outlet pipelines of the oxygen buffer tank (6) and the nitrogen oxide buffer tank (7) are connected with the gas mixer (8) through a three-way joint.

4. A dimethyl sulfide oxidation system as claimed in claim 1, wherein, The liquid mixer (5) and the gas mixer (8) are respectively connected with different feeding inlets of the micro-reactor (9).

5. A dimethyl sulfide oxidation system as claimed in claim 1, wherein, The micro-reactor (9) is connected with the condenser (10), and the outlet of the condenser is connected with the gas-liquid separator (11).

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