Method for regenerating hydrophilic type ionic liquid desulfurizing agent through reverse extraction

An ionic liquid and hydrophilic technology, which is applied in the petroleum industry, hydrocarbon oil treatment products, hydrocarbon oil treatment, etc., can solve the problems of the recovery limitation of hydrophilic ionic liquid, high requirements for technology and equipment, and high requirements, and achieve Low cost, significant effect, and low energy consumption

Inactive Publication Date: 2016-07-20
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently reported ionic liquid recovery methods mainly include: vacuum distillation, which is easy to operate, but consumes a lot of energy; supercritical CO 2 Extraction, this method has a better effect on recovering ionic liquids, but it has higher requirements for technology and equipment; ultrafiltration, nanofiltration, reverse osmosis filtration and other methods can also be used for the enrichment of ionic liquids, but also has higher requirements for equipment ; Water is also used as a stripping agent to reclaim the ionic liquid in the extraction desulfurization process. The method has simple operating conditions, and water is economical and environmentally friendly as a stripping agent. However, this method is suitable for the recovery of hydrophobic ionic liquids. For hydrophilic ionic liquids There are certain restrictions on recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Ionic liquid C 4 MIMHSO 4 Desulfurization and regeneration method

[0030] 1) Desulfurization method

[0031] Will C 4 MIMHSO 4 It is applied to the desulfurization test of extraction and removal of sulfide in oil products, specifically:

[0032] 20ml of C 4 MIMHSO 4 Mix with 10ml of simulated gasoline 1 prepared with thiophene and n-octane with a sulfur content of 507.34ug / ml, stir magnetically at 50°C for 20 minutes under normal pressure, and let stand for 5 minutes to separate the two phases. The oil phase is the simulated oil after desulfurization. The ionic liquid is used for subsequent preparation of saturated ionic liquid.

[0033] 2) Result detection

[0034] The sulfur content in the desulfurized oil phase was detected by a TS-2000 ultraviolet fluorescent sulfur detector, and the result was 254.33ug / ml, and the removal rate obtained by calculation was 49.87%.

[0035] 3) Preparation of saturated ionic liquid

[0036] Add 10ml of simulated gasoline 1 t...

Embodiment 2

[0042] Ionic liquid C 5 MIMHSO 4 Desulfurization and regeneration method

[0043] 1) Desulfurization method

[0044] Will C 5 MIMHSO4 It is applied to the desulfurization test of extraction and removal of sulfide in oil products, specifically:

[0045] 20ml of C 5 MIMHSO 4 Mix with 10ml of simulated gasoline 2 prepared with thiophene and n-octane with a sulfur content of 226.71ug / ml, stir magnetically at 50°C for 20 minutes under normal pressure, and let stand for 5 minutes to separate the two phases. The oil phase is the simulated oil after desulfurization. The ionic liquid is used for subsequent preparation of saturated ionic liquid.

[0046] 2) Result detection

[0047] The sulfur content in the desulfurized oil phase was detected by a TS-2000 ultraviolet fluorescent sulfur detector, and the result was 121.52ug / ml, and the removal rate obtained by calculation was 46.40%.

[0048] 3) Preparation of saturated ionic liquid

[0049] Add 10ml of simulated gasoline 2 to ...

Embodiment 3

[0055] Ionic liquid C 6 MIMHSO 4 Desulfurization and regeneration method

[0056] 1) Desulfurization method

[0057] Will C 6 MIMHSO 4 It is applied to the desulfurization test of extraction and removal of sulfide in oil products, specifically:

[0058] 20ml of C 6 MIMHSO 4 Mix with 10ml of simulated gasoline 3 prepared with thiophene, dibenzothiophene and n-octane with a sulfur content of 725.42ug / ml, stir magnetically at 50°C for 20min under normal pressure, and let stand for 5min to separate the two phases, and the oil phase is desulfurization After the simulated oil, the ionic liquid is used for subsequent preparation of saturated ionic liquid.

[0059] 2) Result detection

[0060] The sulfur content in the desulfurized oil phase was detected by a TS-2000 ultraviolet fluorescent sulfur detector, and the result was 334.37ug / ml, and the removal rate obtained by calculation was 53.91%.

[0061] 3) Preparation of saturated ionic liquid

[0062] Add 10ml of simulated ...

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Abstract

The invention provides a method for regenerating a hydrophilic type ionic liquid desulfurizing agent through reverse extraction.The method is used for a regenerative hydrophilic type ionic liquid desulfurizing agent which is saturated hydrophilic type ionic liquid obtained after extraction and desulfurization. The hydrophilic type ionic liquid is CnMIMHSO4, wherein n is selected from 4 to 8. The method comprises the following steps that the saturated hydrophilic type ionic liquid which is subjected to desulfuration and does not have the capacity of extracting sulfide in oil products and cycloparaffin which has the carbon atom number of 5-8 and serves as a reverse extraction agent are mixed according to a certain volume ratio for reverse extraction, and therefore the hydrophilic type ionic liquid is regenerated.The regenerated ionic liquid is applied to extraction desulfurization of the oil products, and a good extraction desulfurization effect is achieved; circulation is conducted in sequence, input of fresh ionic liquid can be effectively reduced, the cost of oil product desulfurization is reduced, and the environment is protected.

Description

technical field [0001] The invention relates to the research field of ionic liquid recovery technology, in particular to a method for using cyclopentane as a stripping agent to strip and regenerate an ionic liquid desulfurizer. Background technique [0002] In recent years, ionic liquids have been widely used as green solvents and extractants in the desulfurization experiments of petroleum products, and good results have been obtained. However, due to the expensive raw materials for the synthesis of ionic liquids and strict requirements for the synthesis process, the synthesis cost is relatively high; In addition, ionic liquids, as an organic solvent, do not pollute the atmosphere, but cause serious water pollution due to their potential toxicity and non-biodegradability. Therefore, the effective recovery of ionic liquids is the key to their large-scale industrial application, no matter from the economic point of view or from the point of view of environmental protection. ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C10G21/20C10G21/28
CPCC10G21/20C10G21/28C10G2300/104C10G2300/1044C10G2300/202C10G2400/02
Inventor王强王孟平李国嬖王世东臧树良
OwnerLIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY