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Method of adding sulfur in dissolved state in dimethyl disulfide production process

A dimethyl disulfide production process technology, applied in the field of adding dissolved sulfur in the dimethyl disulfide production process, can solve the problems of easy plugging of sulfur towers, high cost of dimethyl disulfide raw materials, and high energy consumption of gasification , to increase the contact area of ​​raw materials

Active Publication Date: 2015-05-06
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the dimethyl sulfate / sodium persulfide method produces dimethyl disulfide with high raw material cost and high toxicity, and the methyl mercaptan air oxidation method has harsh reaction conditions and a high risk factor.
If the sulfur gasification reacts with methyl mercaptan in a homogeneous phase, but the boiling point of sulfur is as high as 444.6°C, the gasification energy consumption is high, and the optimum temperature for the reaction of sulfur and methyl mercaptan is 30-60°C
If sulfur is directly added to react with methyl mercaptan in the presence of a catalyst, the sulfur will easily block the tower and it will be difficult to clean up

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] A method for adding sulfur in a dissolved state during the production of dimethyl disulfide, which uses methyl mercaptan and sulfur to generate dimethyl disulfide in a reactor, wherein sulfur is dissolved in the form of solid sulfur in the molten sulfur tank preset After dimethyl disulfide (the mass ratio of sulfur to dimethyl disulfide is 1:12, and the solubility is controlled at 20%), it is pumped into the reactor. The sulfur is solid sulfur, and the solid sulfur is added into a single-component or multi-component pre-prepared dimethyl disulfide, dimethyl trisulfide, dimethyl tetrasulfide, dimethyl polysulfide through a sulfur hopper. Sulfur melting tank for mixed solutions. Solid sulfur is heated to 20-60°C by steam and dissolved in the sulfur melting tank at a stirring speed of 60-100r / min. There is also a star feeder under the sulfur hopper, and solid sulfur is fed into the sulfur melting tank at a frequency of 5-180r / min.

Embodiment 2

[0009] A method for adding sulfur in a dissolved state during the production of dimethyl disulfide, which uses methyl mercaptan and sulfur to generate dimethyl disulfide in a reactor, wherein sulfur is dissolved in the form of solid sulfur in the molten sulfur tank preset After dimethyl trisulfide (the mass ratio of sulfur to dimethyl trisulfide is 1:25, and the control solubility is 48%), it is pumped into the reactor. The sulfur is solid sulfur, and the solid sulfur is added into a single-component or multi-component pre-prepared dimethyl disulfide, dimethyl trisulfide, dimethyl tetrasulfide, dimethyl polysulfide through a sulfur hopper. Sulfur melting tank for mixed solutions. Solid sulfur is heated to 20-60°C by steam and dissolved in the sulfur melting tank at a stirring speed of 60-100r / min. There is also a star feeder under the sulfur hopper, and solid sulfur is fed into the sulfur melting tank at a frequency of 5-180r / min.

Embodiment 3

[0011] A method for adding sulfur in a dissolved state during the production of dimethyl disulfide, which uses methyl mercaptan and sulfur to generate dimethyl disulfide in a reactor, wherein sulfur is dissolved in the form of solid sulfur in the molten sulfur tank preset After dimethyl tetrasulfide (the mass ratio of sulfur to dimethyl tetrasulfide is 1:18, and the solubility is controlled at 10%), it is pumped into the reactor. The sulfur is solid sulfur, and the solid sulfur is added into a single-component or multi-component pre-prepared dimethyl disulfide, dimethyl trisulfide, dimethyl tetrasulfide, dimethyl polysulfide through a sulfur hopper. Sulfur melting tank for mixed solutions. Solid sulfur is heated to 20-60°C by steam and dissolved in the sulfur melting tank at a stirring speed of 60-100r / min. There is also a star feeder under the sulfur hopper, and solid sulfur is fed into the sulfur melting tank at a frequency of 5-180r / min.

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Abstract

The invention relates to the technical field of chemical industry and in particular relates to a new method of adding sulfur in the new production process of dimethyl disulfide. According to the method, sulfur is fed after being dissolved; one single component or the mixed solution of a plurality of components of dimethyl disulfide, dimethyl trisulfide, dimethyl tetrasulfide and dimethyl polysulfide is taken as a solute, and solid-state sulfur is dissolved into the solute and then fed into a reactor. In the process, the solute and the solvent are metered and fed continuously and accurately, full-automatic operations are realized, insufficient raw material utilization rate due to the fact that the whole reaction ratio is affected by the errors of manual feeding is avoided and then the production cost is not increased; in addition, sulfur is fed into the reactor in the dissolved state and is distributed uniformly, so that the raw material contact area is increased and fast and effective reaction is guaranteed.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for adding dissolved sulfur in the production process of dimethyl disulfide. Background technique [0002] The existing dimethyl disulfide production technology is mainly produced by dimethyl sulfate / sodium persulfide method, methyl mercaptan air oxidation method, and methyl mercaptan / gaseous sulfur method. Among them, the dimethyl sulfate / sodium persulfide method produces dimethyl disulfide with high raw material cost and high toxicity, and the methyl mercaptan air oxidation method has harsh reaction conditions and a high risk factor. If sulfur gasification and methyl mercaptan react homogeneously, but the boiling point of sulfur is as high as 444.6°C, the gasification energy consumption is high, and the optimum temperature for the reaction of sulfur and methyl mercaptan is 30-60°C. If sulfur is directly added in the presence of a catalyst to react with meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C321/14C07C319/24
Inventor 王杰张怀有龙真明范鹏杨军
Owner HUBEI XINGFA CHEM GRP CO LTD