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Process for extracting insoluble sulfur

A sulfur-soluble technology, applied in the preparation/purification of sulfur, etc., can solve problems such as solvent loss without extraction effect, industrial application of unseen technology, low extraction effect, etc., to solve the problem of toxicity and safety, and reduce equipment Investment cost, good extraction effect

Active Publication Date: 2009-01-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, relevant reports did not involve a series of detailed issues including extraction effect, ratio of solvent to sulfur, solvent loss, etc., and since the report, there has been no industrial application of this technology
[0007] non-CS 2 The solvent extraction effect is generally lower, but the safety is better than CS 2 Extraction, but this kind of solvent also has certain toxicity

Method used

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  • Process for extracting insoluble sulfur
  • Process for extracting insoluble sulfur

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Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0023] The industrial insoluble sulfur crude product with an IS mass content of 48.6% is used as a raw material, and the solvent of the present invention is used as an extraction agent. At an extraction temperature of 80°C and an extraction time of 15 minutes, the extraction experiment is carried out by adjusting the solvent ratio, and the content of IS in the obtained product is See Table 2 below.

[0024] Table 2 adopts solvent of the present invention to be extraction agent experimental result

[0025] Solvent ratio (m:m)

Embodiment 3-4

[0027] Insoluble sulfur crude products with different IS contents are used as raw materials, industrialized carbon disulfide, tetrachlorethylene and the solvent of the present invention are respectively used as extraction agents, and the extraction temperature is 80°C (25°C for carbon disulfide), and the extraction time is 15 minutes. In the extraction experiment, the content of IS in the obtained product is shown in Table 3 below.

[0028] Table 3 adopts solvent of the present invention, tetrachlorethylene, carbon disulfide to the extraction result of different raw materials

[0029]

[0030] From the results of Table 3, it is obvious that the extraction effect of the extraction solvent of the present invention when purifying the insoluble sulfur product is equivalent to the carbon disulfide solvent, but obviously better than the tetrachlorethylene solvent.

Embodiment 5-9

[0032] Using the industrial insoluble sulfur crude product with an IS mass content of 48.6% as a raw material, the extraction time is 15 minutes, the extraction effects of the solvent of the present invention at different temperatures and solvent ratios are shown in Table 4 below.

[0033] Table 4 is the extraction result of solvent of the present invention under different temperature and solvent ratio

[0034] Solvent ratio, m:

[0035] As can be seen from the results in Table 4, the extraction effect of the solvent will decrease if the extraction temperature is lowered.

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Abstract

The invention relates to method for extracting insoluble sulfur from a product of IS-90 obtained from a polymerization insoluble sulfur crude product by utilizing tetranap. The method is characterized in that a product of high purity with the content of insoluble sulfur larger than 90m percent is obtained and extracted from a product with the content of insoluble sulfur being 40-80m percent after ordinary sulfur polymerization by using tetranap as an extracting solvent at the temperature of 70-90 DEG C for 10-45 minutes; the mass ratio of the solvent is between 2.3 and 9; the solvent has the characteristics of good effect, low toxicity, no easy volatilization, and good safety, can be used as a novel safe, environmental-friendly and high efficient insoluble sulfur extracting solvent instead of CS2 and tetracarp, and is suitable for the extraction separation of obtaining the insoluble sulfur product of high purity from the product obtained after ordinary sulfur polymerization. The adoption of the technology can greatly reduce investment expense of devices and improve the safety of operation process.

Description

technical field [0001] The invention relates to an insoluble sulfur extraction method for obtaining IS-90 products by using tetralin to extract and polymerize crude insoluble sulfur products. Background technique [0002] Insoluble sulfur, whose chemical name is polymeric sulfur (abbreviated as IS), is made from common sulfur and is a linear polymer polymerized by a large number of sulfur atoms, with a molecular weight of 30,000-40,000. Due to common sulfur in CS 2 The solubility in CS is great, while polymeric sulfur is insoluble in CS 2 , so it is usually called insoluble sulfur. According to the content of polymerized sulfur, the products are divided into two categories: IS-60 (IS content ≥ 60%) and IS-90 (IS content ≥ 90%). Some physical properties of insoluble sulfur are close to those of rubber, and it is an excellent vulcanizing agent in rubber processing. It is widely used in natural rubber and synthetic rubber, and the largest amount is used in the automobile tir...

Claims

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Application Information

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IPC IPC(8): C01B17/12
Inventor 董元成徐文清邹士应谭振明廖斌
Owner PETROCHINA CO LTD
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