A composite extractant suitable for coal-based naphtha and method for preparing solvent oil

A technology of compound extractant and solvent oil, applied in the field of solvent oil research, can solve the problems of single extractant, low extraction efficiency, and difficulty in removing aromatic hydrocarbons, so as to relieve the pressure of petroleum resources, simplify the subsequent processing process, and achieve non-aromatic hydrocarbons. The effect of content reduction

Inactive Publication Date: 2017-05-03
NORTHWEST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0009] The above methods all use petroleum-based naphtha / gasoline to prepare solvent oil. The main defects are that the nature of the extractant is single, the extraction efficiency is not high, the aromatics are difficult to remove, and the production cost is high. Strictly, we need to control the aromatics content in solvent oil to a very low range, so a coal-based naphtha aromatics extraction technology similar to petroleum-based naphtha came into being

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  • A composite extractant suitable for coal-based naphtha and method for preparing solvent oil
  • A composite extractant suitable for coal-based naphtha and method for preparing solvent oil

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Embodiment 1

[0029] In the present embodiment, the high-quality coal-based naphtha obtained by the whole-fraction hydrogenation of northern Shaanxi coal tar is used as a raw material, and the method for preparing solvent oil is as follows:

[0030] (1) the coal-based naphtha raw material and the composite extraction agent are respectively added to the extraction tower, the raw material enters from the middle of the extraction tower, the composite extraction agent enters from the top of the extraction tower, and the two are in countercurrent contact extraction in the extraction tower, The extraction temperature is 80°C, the pressure is 0.75MPa (absolute pressure), the volume ratio of the extractant to the raw coal-based naphtha is 2:1, and the dearomatized naphtha and the rich solvent are obtained at the top and bottom of the tower respectively;

[0031] (2) The dearomatized naphtha obtained at the top of the tower is sent to the fractionation tower, and the 80-120° C. fraction is cut to obt...

Embodiment 2

[0035] In the present embodiment, the high-quality coal-based naphtha obtained by the whole-fraction hydrogenation of northern Shaanxi coal tar is used as a raw material, and the method for preparing solvent oil is as follows:

[0036] (1) the coal-based naphtha raw material and the composite extraction agent are respectively added to the extraction tower, the raw material enters from the middle of the extraction tower, the composite extraction agent enters from the top of the extraction tower, and the two are in countercurrent contact extraction in the extraction tower, The extraction temperature is 85°C, the pressure is 0.75MPa (absolute pressure), the volume ratio of the extractant to the raw coal-based naphtha is 2:1, and the dearomatized naphtha and the rich solvent are obtained at the top and bottom of the tower respectively;

[0037] (2) The dearomatized naphtha obtained at the top of the tower is sent to the fractionation tower, and the 80-120° C. fraction is cut to obt...

Embodiment 3

[0041] In the present embodiment, the high-quality coal-based naphtha obtained by the whole-fraction hydrogenation of northern Shaanxi coal tar is used as a raw material, and the method for preparing solvent oil is as follows:

[0042] (1) the coal-based naphtha raw material and the composite extraction agent are respectively added to the extraction tower, the raw material enters from the middle of the extraction tower, the composite extraction agent enters from the top of the extraction tower, and the two are in countercurrent contact extraction in the extraction tower, The extraction temperature is 90°C, the pressure is 0.8MPa (absolute pressure), the volume ratio of the extractant to the raw coal-based naphtha is 2.5:1, and the dearomatized naphtha and the rich solvent are obtained at the top and bottom of the tower respectively;

[0043] (2) The dearomatized naphtha obtained at the top of the tower is sent to the fractionation tower, and the 80-120° C. fraction is cut to ob...

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Abstract

The invention provides a composite extractant suitable for coal-based naphtha and a method for preparing solvent oil. The composite extractant is composed of 70 parts of sulfolane, 20 to 30 parts of propylene carbonate, and 8 to 15 parts of triethylene glycol ether. and 2 to 3 parts of water, prepared according to conventional processes, so that it can produce a synergistic effect, ensure good solubility while ensuring high selectivity, reduced non-aromatic hydrocarbon content, fast phase separation speed, and high extraction efficiency; when coal is used Base naphtha is used as raw material, and the composite extractant is used to prepare solvent oil by countercurrent extraction and fractionation in an extraction tower. The novel composite extractant of the present invention is used to extract aromatic hydrocarbons from coal-based naphtha under appropriate process conditions. It is mentioned that compared with petroleum-based naphtha, the solvent oil obtained has higher purity, less aromatic hydrocarbon content, and low toxicity, and the raw material is coal-based naphtha instead of traditional petroleum-based naphtha, which alleviates the pressure on international petroleum resources and broadens the scope of acquisition from non-petroleum resources. Channels for mineral spirits.

Description

technical field [0001] The invention belongs to the technical field of solvent oil research, in particular to a composite extractant suitable for coal-based naphtha and a method for preparing the solvent oil. Background technique [0002] Solvent oil is one of the five major categories of petroleum products. It is an important organic chemical raw material and basic oil for industrial production. kinds of industries. [0003] Paraffin solvent oil is the product separated by deep processing of coal-based naphtha, which is composed of n-paraffin, isoparaffin, naphthene and a small amount of aromatic hydrocarbons. The alkane solvent oil can be divided into three categories according to the boiling range. The low boiling point solvent oil, such as 6# extraction solvent, has a boiling range of 60~90℃; the medium boiling point solvent oil, such as 120# rubber solvent oil, has a boiling range of 80~120 ℃; high boiling point solvent oil, such as 200# paint solvent oil, the boiling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G21/06
Inventor 李冬张琳娜薛凤凤裴亮军李稳宏
Owner NORTHWEST UNIV
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