Method for producing dimethyl disulfide by methyl mercaptan vulcanization method

A technology of dimethyl disulfide and dimethyl trisulfide, which is applied in the chemical industry, can solve the problems of difficult recovery of mercaptan synthesis tail gas, backward production equipment technology, and large loss of effective components, so as to avoid the decline of catalyst activity, The effect of high utilization rate of effective components and low pollution

Pending Publication Date: 2022-05-13
新疆广汇陆友硫化工有限公司
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Problems solved by technology

Domestic industrial production generally adopts the methyl mercaptan method and the dimethyl sulfate method. In the production process of the methyl mercaptan method, there are generally problems such as backward production equipment technology, low reaction efficiency, difficult recovery of mercaptan synthesis tail gas, and large loss of effective components. Smaller scale and more polluting problems

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  • Method for producing dimethyl disulfide by methyl mercaptan vulcanization method

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Effect test

Embodiment 1

[0022] see figure 1 A method for producing dimethyl disulfide by a methyl mercaptan vulcanization method, comprising the following steps:

[0023] Step 1. Nitrogen enters the electric heater 2 for heating after being pressurized by the nitrogen blower 1. The heated nitrogen enters the steam heater 3 for heating again and then enters the mercaptan reactor 4 to heat it. After the nitrogen is discharged from the mercaptan reactor 4 Return to the nitrogen fan 1 after being cooled by the nitrogen water cooler 5, and the nitrogen heating system is stopped after circulating the nitrogen to the mercaptan reactor 4 to 180°C;

[0024] Step 2. Use the pipeline electric heater 14 to preheat the molten salt pipeline to 180°C to avoid damage to pipeline expansion caused by excessive heating of the pipeline, start the molten salt pump 6, and the molten salt enters the mercaptan reactor 4 from the molten salt tank 7 Continue heating it, the molten salt returns to the molten salt tank 7 after...

Embodiment 2

[0029] see figure 1 A method for producing dimethyl disulfide by a methyl mercaptan vulcanization method, comprising the following steps:

[0030] Step 1. Nitrogen enters the electric heater 2 for heating after being pressurized by the nitrogen blower 1. The heated nitrogen enters the steam heater 3 for heating again and then enters the mercaptan reactor 4 to heat it. After the nitrogen is discharged from the mercaptan reactor 4 Return to the nitrogen blower 1 after being cooled by the nitrogen water cooler 5, and the nitrogen circulates the mercaptan reactor 4 to heat up to 200°C, and stops the nitrogen heating system;

[0031] Step 2. Preheat the molten salt pipeline to 200°C with the pipeline electric heater 14, start the molten salt pump 6, and the molten salt enters the mercaptan reactor 4 from the molten salt tank 7 to continue heating it, and the molten salt reacts from the mercaptan Return to the molten salt tank 7 after the reactor 4 comes out, and the molten salt ci...

Embodiment 3

[0036] see figure 1 A method for producing dimethyl disulfide by a methyl mercaptan vulcanization method, comprising the following steps:

[0037] Step 1. Nitrogen enters the electric heater 2 for heating after being pressurized by the nitrogen blower 1. The heated nitrogen enters the steam heater 3 for heating again and then enters the mercaptan reactor 4 to heat it. After the nitrogen is discharged from the mercaptan reactor 4 Return to the nitrogen fan 1 after being cooled by the nitrogen water cooler 5, and then stop the nitrogen heating system after circulating the nitrogen to the mercaptan reactor 4 and raising the temperature to 220°C;

[0038] Step 2. Preheat the molten salt pipeline to 220°C with the pipeline electric heater 14, start the molten salt pump 6, and the molten salt enters the mercaptan reactor 4 from the molten salt tank 7 to continue heating it, and the molten salt reacts from the mercaptan Return to the molten salt tank 7 after the reactor 4 comes out,...

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Abstract

The invention relates to a method for producing dimethyl disulfide through a methyl mercaptan vulcanization method, and belongs to the technical field of chemical engineering, the method for producing dimethyl disulfide through the methyl mercaptan vulcanization method can realize large-scale utilization of hydrogen sulfide, and provides a new thought for comprehensive utilization of hydrogen sulfide in petrochemical engineering and coal chemical engineering; the method comprises the following steps: absorbing effective gases such as hydrogen sulfide in methyl mercaptan synthesis tail gas by using low-temperature methanol, desorbing hydrogen sulfide gas from an absorption liquid for recycling, and desorbing the absorption liquid methanol and conveying the desorbed absorption liquid methanol to a mercaptan reactor to participate in a reaction; the methyl mercaptan is subjected to a high-pressure rectification process, and rectification tail gas is returned to methyl mercaptan synthesis for recycling; the hydrogen sulfide gas obtained by the reaction of the vulcanizing tower returns to the mercaptan reactor for recycling, the dimethyl trisulfide and the dimethyl polysulfide generated by the reaction of the vulcanizing tower can be used as feed of the vulcanizing tower to react with methyl mercaptan to generate dimethyl disulfide, and the production device is advanced in technology, high in reaction efficiency, high in effective component utilization rate and small in pollution.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for producing dimethyl disulfide by a methyl mercaptan vulcanization method. Background technique [0002] Dimethyl disulfide is an important chemical product, which can be widely used as an intermediate for the preparation of pesticides and insecticides: in the petroleum industry, it can be used as an anti-corrosion and coking agent for ethane cracking furnaces, gasoline Vulcanizing agent in hydrogen catalysis, inhibitor of hydrocracking in benzene nuclei dehydroxylation reaction; in rubber industry, it can be used as solvent, regeneration agent, softener and plasticizer; in addition, dimethyl disulfide can also be used as Used as fuel, lubricating additive and inhibitor of some organic chemical reactions. Domestic industrial production generally adopts the methyl mercaptan method and the dimethyl sulfate method. In the production process of the m...

Claims

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Application Information

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IPC IPC(8): C07C319/24C07C319/22C07C321/14B01D3/14B01D53/14B01J19/00B01J19/24
CPCC07C319/24C07C319/22B01D53/1468B01D53/1425B01D3/14B01J19/00B01J19/0053B01J19/24C07C321/14
Inventor 宋景涛刘成崔廷政朱忠杰吴启东雷虎虎岳雷邱涛
Owner 新疆广汇陆友硫化工有限公司
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