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Method for increasing yield of pyrolytic tar of lignite and improving quality of pyrolytic tar of lignite through pretreating lignite by using acidic ionic liquid

A technology of acidic ionic liquid and ionic liquid, which is applied in coking ovens, petroleum industry, special forms of dry distillation, etc. It can solve the problems of poor economy, large amount of ionic liquid, and no display, so as to improve quality, low pretreatment temperature, and increase Yield effect

Active Publication Date: 2014-07-16
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent (application number 201310489900.2) discloses a method of using ionic liquid pretreatment to increase the yield of coal pyrolysis tar. The large amount of ionic liquid used in this method leads to poor process economy. What is important is that it does not show that the ionic liquid used can improve the quality of tar.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 3g of 1-sulfonic acid butyl-3-methylimidazolium trifluoromethanesulfonate and 3g of Xilingrad lignite and mix well, pretreat at 200°C for 30min, and wash with distilled water to remove acidic ions Liquids, distilled water and acidic ionic liquid mixtures are recycled by evaporation. After multiple washings, the pretreated coal samples were dried for later use. Weigh 3 g of the pretreated coal sample and place it in a fixed-bed reactor. The pyrolysis conditions are nitrogen atmosphere, the flow rate is 100ml / min, heating from room temperature to 800°C, the heating rate is 10°C / min, and the liquid product is collected with a cold trap. The collected tar was separated by column chromatography to obtain aliphatic hydrocarbons, aromatic hydrocarbons and phenolic components respectively. It is found that the yield of liquid product is increased by 75% compared with that of raw coal, and the yield of each component is increased by 80%, 65%, and 35% respectively compare...

Embodiment 2

[0020] Weigh 3g of 1-sulfonic acid butyl-3-methylimidazolium trifluoromethanesulfonate and 90g of Xilingrad lignite, mix well, pretreat at 200°C for 120min, wash with methanol to remove acidity The mixture of ionic liquid, methanol and acidic ionic liquid can be recovered by evaporation and recycled. After multiple washings, the pretreated coal samples were dried for later use. Weigh 3 g of the pretreated coal sample and place it in a fixed-bed reactor. The pyrolysis conditions are nitrogen atmosphere, the flow rate is 100ml / min, heating from room temperature to 800°C, the heating rate is 10°C / min, and the liquid product is collected with a cold trap. The collected tar was separated by column chromatography to obtain aliphatic hydrocarbons, aromatic hydrocarbons and phenolic components respectively. It is found that the yield of liquid product is increased by 75% compared with that of raw coal, and the yield of each component is increased by 90%, 80%, and 55% respectively co...

Embodiment 3

[0022] Weigh 3g of 1-sulfonic acid butyl-3-methylimidazolium trifluoromethanesulfonate and 3g of Shengli lignite and mix well, pretreat at 100°C for 90min, wash with ethanol after the end to remove the acidic ionic liquid, The mixture of ethanol and acidic ionic liquid can be recovered by evaporation and recycled. After multiple washings, the pretreated coal samples were dried for later use. Weigh 3 g of the pretreated coal sample and place it in a fixed-bed reactor. The pyrolysis conditions are nitrogen atmosphere, the flow rate is 100ml / min, heating from room temperature to 800°C, the heating rate is 10°C / min, and the liquid product is collected with a cold trap. The collected tar was separated by column chromatography to obtain aliphatic hydrocarbons, aromatic hydrocarbons and phenolic components respectively. It is found that the liquid product yield is increased by 45% compared with the raw coal, and the yields of each component are respectively increased by 50%, 45%, a...

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Abstract

The invention discloses a method for increasing the yield of pyrolytic tar and improving the quality of the pyrolytic tar through pretreating lignite by using an acidic ionic liquid under a mild condition, belonging to the technical field of comprehensive utilization of lignite. The method comprises the steps of selecting an acidic ionic liquid capable of efficiently damaging a weak bonding structure in lignite, adding lignite powder and the acidic ionic liquid into a reaction kettle, and pretreating under a mild condition; then, washing the acidic ionic liquid by using water or an organic solvent, then, drying a coal sample, and recycling the organic solvent and the acidic ionic liquid. Compared with raw coal which is pretreated by using the acidic ionic liquid, the pretreated lignite is pyrolyzed, so that the pyrolytic tar of the lignite is high in yield and remarkably improved in quality. The method is simple in process, clean in process and high in tar yield; in addition, the acidic ionic liquid is low in dosage and easy to recycle.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of lignite, and in particular relates to a method for pretreating lignite with an acidic ionic liquid to increase the yield of tar obtained by pyrolysis of lignite and improve the quality of the tar. Background technique [0002] my country is rich in medium and low-rank coal resources, especially the proven reserve of lignite reaches 130.3 billion tons. Some liquid fuels and chemicals can be obtained through pyrolysis of coal, and lignite pyrolysis can not only obtain high value-added tar but also improve the quality of lignite; difficulties etc. [0003] Coal pretreatment is to increase the yield of tar in the pyrolysis process by increasing the hydrogen content in coal and improving the structure of coal. Miura et al. used a hydrogen-donating solvent to swell coal as a pretreatment method, which increased the yield of coal pyrolysis tar by 23%. (Energy & Fuels, 1991, 5(2):3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B57/08C10B53/04
Inventor 雷智平张昊朱平水恒福
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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