Method for removing organic sulfur in coal by polar supercritical fluid

A supercritical fluid, organic sulfur technology, used in separation methods, chemical instruments and methods, solid fuels, etc., to achieve the effects of strong polarity, flame retardant price, and high diffusion coefficient

Inactive Publication Date: 2020-02-25
SHANXI COKING COAL GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of desulfurization of raw coal before combustion, and to provide a method for r...

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  • Method for removing organic sulfur in coal by polar supercritical fluid

Examples

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Effect test

Embodiment 1

[0016] Example 1: A method for removing organic sulfur in coal by polar supercritical fluid, including the following steps:

[0017] , Coal sample pretreatment: coal sample (the coal sample can be selected as Shanxi Gaoyang raw coal or Tangshan Kailuan raw coal) After selection, the coal sample is crushed to a particle size of 1 mm to obtain a suitable particle size, geometric shape and specific surface area. Enhance desulfurization effect;

[0018] , Coal sample determination: Determine and analyze the total sulfur content and organic sulfur in the coal sample after crushing by titration, determine the chemical bond type and polarity of the -C-S- bond in the organic sulfur, and select CO 2 Mix a small amount of alcohol liquid as a polar supercritical fluid, set the reaction condition as CO 2 Above the critical temperature and critical pressure, that is, above 31.26℃ and above 7.38MPa; the amount of alcohol liquid is small, so only CO is considered 2 The critical temperature and c...

Embodiment 2

[0023] Example 2: A method for removing organic sulfur in coal by polar supercritical fluid, including the following steps:

[0024] , Coal sample pretreatment: coal sample (the coal sample can be selected as Shanxi Gaoyang raw coal or Tangshan Kailuan raw coal) After selection, the coal sample is crushed to a particle size of 3mm to obtain a suitable particle size, geometric shape and specific surface area. Enhance desulfurization effect;

[0025] , Coal sample determination: Determine and analyze the total sulfur content and organic sulfur in the coal sample after crushing by titration, determine the chemical bond type and polarity of the -C-S- bond in the organic sulfur, and select CO 2 Mix a small amount of water or CO 2 Mix a small amount of aromatic liquid as a polar supercritical fluid, set the reaction condition as CO 2 Above the critical temperature and pressure, namely above 31.26℃ and above 7.38MPa; the amount of water or aromatic liquid is small, so only CO is consider...

Embodiment 3

[0030] Example 3: A method for removing organic sulfur in coal by polar supercritical fluid, including the following steps:

[0031] , Coal sample pretreatment: coal sample (coal sample can be selected as Shanxi Gaoyang raw coal or Tangshan Kailuan raw coal) After selection, the coal sample is crushed to a particle size of 2mm to obtain a suitable particle size, geometric shape and specific surface area. Enhance desulfurization effect;

[0032] , Coal sample determination: Determine and analyze the total sulfur content and organic sulfur in the coal sample after crushing by titration, determine the chemical bond type and polarity of the -C-S- bond in the organic sulfur, and select CO 2 A small amount of alkane gas is mixed as a polar supercritical fluid, the alkane gas is ethane or propane, and the reaction conditions are set to CO 2 Above the critical temperature and pressure, that is, above 31.26℃ and above 7.38MPa; the amount of alkane gas is small, so only CO is considered 2 T...

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Abstract

The invention belongs to the technical field of desulfurization of raw coal before combustion, and particularly relates to a method for removing organic sulfur in coal by a polar supercritical fluid.The purpose of the invention is to solve the problems of desulfurization of raw coal before combustion. The method comprises the following steps: crushing a coal sample to a proper particle size; detecting the total sulfur content and organic sulfur of the coal sample, detecting the chemical bond type and polarity of a -C-S-bond in the organic sulfur, and determining the polar supercritical fluidand reaction conditions; vacuumizing the reactor before a reaction; removing the organic sulfur in the coal by a system having a strong polarity, a good reaction activity and a high selectivity and formed by combining with the polar supercritical fluid; and collecting, analyzing and detecting the reacted sample. The proper polar supercritical fluid is selected according to different structures ofthe organic sulfur in the coal sample, and the prepared coal sample is subjected to the desulfurization reaction in the polar supercritical fluid, so the method has the advantages of high polarity, good pertinence, high selectivity, high reaction activity and good desulfurization effect, and is of great significance to desulfurization of raw coal before combustion.

Description

Technical field [0001] The invention belongs to the technical field of pre-combustion removal of raw coal, and specifically relates to a method for removing organic sulfur in coal by a polar supercritical fluid. Background technique [0002] Sulfur is one of the main harmful elements in coal series. It will not only deteriorate the quality of subsequent industrial products, but the sulfur oxides and sulfides produced by its combustion will also cause serious air pollution. The sulfur in coal is divided into inorganic sulfur and organic sulfur. Inorganic sulfur can be removed by physical methods. The chemical structure and composition structure of organic sulfur coal matrix are also very complicated, so the thermal stability is also very different. The removal of organic sulfur in coal is achieved through the breaking of -C-S- bonds and the shedding of overall functional groups under high temperature conditions. The removal is relatively difficult, and it is currently a hot and di...

Claims

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Application Information

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IPC IPC(8): C10L9/00B01D11/02B01D11/00
CPCB01D11/0203B01D2011/005C10L9/00C10L2290/544
Inventor 金智新彭垠赵刚强巩林盛高飞赵鹏飞马子鉴
Owner SHANXI COKING COAL GROUP
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