Method for preparation of insoluble sulfur

A sulfur and soluble technology, which is applied in the field of preparing insoluble sulfur, can solve the problems of low conversion rate and poor quenching effect, and achieve the effects of increased insoluble sulfur content, high production efficiency, and easy industrialization

Active Publication Date: 2014-01-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quenching of the liquid flow is basically by pouring or dripping, and the quenching effect is poor, resulting in a low conversion rate, which is why the content of insoluble sulfur produced by the melting method is lower than that of the gasification method.

Method used

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  • Method for preparation of insoluble sulfur
  • Method for preparation of insoluble sulfur
  • Method for preparation of insoluble sulfur

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw material sulfur is directly heated to 280°C to make it melt; the molten sulfur liquid is centrifugally atomized into sulfur droplets with an average particle size of 10 μm through the atomizer; the circulating nitrogen at room temperature is distributed by the gas distributor and mixed with the sulfur droplets; nitrogen The outlet temperature is controlled at 180°C; the sulfur droplets stay on the upper part of the tower for 25 seconds. The polymerized sulfur is mixed with nitrogen cooled to 0°C by the cooling device and distributed by the gas distributor, enters the lower part of the tower body, and is cooled to below 60°C in 2 seconds; cyclone separation, collection, and packaging to obtain insoluble sulfur products; The nitrogen discharged from the tower body is recycled by being separated from the residual sulfur particles.

Embodiment 2

[0027] The raw material sulfur is directly heated to 300°C to melt it; the melted sulfur liquid is centrifugally atomized into sulfur droplets with an average particle size of 20 μm through the atomizer; the circulating nitrogen at room temperature is distributed by the gas distributor and mixed with the sulfur droplets; nitrogen The outlet temperature is controlled at 200°C; the sulfur droplets stay on the upper part of the tower for 25 seconds. The polymerized sulfur is mixed with the nitrogen cooled to -10°C by the cooling device and distributed by the gas distributor, enters the lower part of the tower body, and is cooled to below 60°C within 5 seconds; cyclone separation, collection, and packaging to obtain insoluble sulfur products ; The nitrogen discharged from the tower body is recycled by being separated from the residual sulfur particles.

Embodiment 3

[0029] The raw sulfur is directly heated to 330°C to make it melt; the molten sulfur liquid is centrifugally atomized by the atomizer into sulfur droplets with an average particle size of 20 μm; the circulating nitrogen at room temperature is distributed by the gas distributor and mixed with the sulfur droplets; nitrogen The outlet temperature is controlled at 210°C; the sulfur droplets stay on the upper part of the tower for 20 seconds. The polymerized sulfur is mixed with the nitrogen cooled to -20°C by the cooling device and distributed by the gas distributor, enters the lower part of the tower body, and is cooled to below 60°C within 5 seconds; cyclone separation, collection, and packaging to obtain insoluble sulfur products ; The nitrogen discharged from the tower body is recycled by being separated from the residual sulfur particles.

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Abstract

The invention relates to a method for preparation of insoluble sulfur. In a production process of insoluble sulfur, rapid cooling is one of very key process steps, realizes an effect of instantly stopping a reversible reaction and further directly affects the content of insoluble sulfur in a product. The method provided by the invention comprises the following steps of directly heating raw material sulfur to 280-400 DEG C, forming a large number of sulfur liquid droplets by centrifugal atomization through an atomizer, and increasing the specific surface area of sulfur; then cooling to 180-240 DEG C by circulating nitrogen at room temperature and keeping for 2-25 seconds; further cooling by circulating cold nitrogen to below 60 DEG C within 2-20 seconds; performing cyclone separation, collecting and packaging to obtain the insoluble sulfur product, wherein the average particle size of the product is 10 mu m-50 mu m; recycling the separated nitrogen. The method provided by the invention has the advantages of high safety in operation, low toxicity, high production efficiency, easiness in industrialization and high stability of prepared insoluble sulfur.

Description

technical field [0001] The invention relates to a method for preparing insoluble sulfur, in particular to a method for rapidly cooling the insoluble sulfur by using a spraying process and cold nitrogen to effectively restrain the progress of the reverse reaction and obtain the insoluble sulfur. Background technique [0002] Insoluble sulfur (IS), also known as polymeric sulfur, also known as μ-type sulfur, refers to sulfur insoluble in carbon disulfide. It is a long-chain polymer of sulfur. It is chemically and physically inert. The joint point is uniform, and the rubber vulcanized by it has the best non-blooming property, and can effectively prevent the early scorching of the rubber during the processing and improve the adhesion between the rubber and the steel wire or chemical fiber cord. It is a good choice for the production of radial tires special vulcanizing agent. The demand for high-quality insoluble sulfur is growing rapidly as the radialization rate of tires incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/12
Inventor 王益庆周静张立群
Owner BEIJING UNIV OF CHEM TECH
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