Process method for extracting normal hexane and isohexane from crude hexane

A process method and technology of crude hexane, which is applied in the field of petrochemical separation, can solve the problems of difficulty in obtaining high-purity n-hexane products, high energy consumption of precision rectification, and high production costs, and achieves remarkable benzene removal effect and simple production process , the effect of convenient operation

Inactive Publication Date: 2012-02-15
洛阳金达石化有限责任公司
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Problems solved by technology

due to C 6 The boiling points of distillates are very similar (such as n-hexane at 69°C and methylcyclopentane at 71.8°C), so it is difficult to separate them by ordinary rectification. Precision rectification has high energy consumption, high production cost

Method used

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  • Process method for extracting normal hexane and isohexane from crude hexane
  • Process method for extracting normal hexane and isohexane from crude hexane
  • Process method for extracting normal hexane and isohexane from crude hexane

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Embodiment Construction

[0024] The technical solution of the present invention will be further described in detail through the drawings and examples below, however, the present invention is not limited to these examples.

[0025] Such as figure 1 Shown, the present invention extracts the processing method of normal hexane, isohexane by crude hexane, and its concrete processing steps are:

[0026] (1) The catalyst loaded in the hydrogenation reactor is an active metal nickel-based catalyst with a spherical appearance, a diameter of 2.5~4.5mm, and a bulk density of 0.6±0.02 g / cm 3 , the specific surface area is not less than 100m 2 / g, the radial compressive strength is not more than 40N / grain; the raw material crude hexane is mixed with hydrogen, heated to 130-170°C by the feed / product heat exchanger and feed heater, and then enters the hydrogenation reactor. Hydrodearomatization reaction is carried out under the influence of hydrogenation reaction. The operating conditions of hydrogenation reaction...

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Abstract

The invention discloses a process method for extracting normal hexane and isohexane from crude hexane. The process method comprises the following steps of: (1) mixing and heating raw material crude hexane and hydrogen gas and feeding into a hydrogenation reactor, and performing hydrodearomatization reaction under the action of a catalyst; (2) cooling a hydrogenation reaction product and then feeding in a low-pressure separation tank to perform gas-liquid separation, wherein gas phase is discharged from the top of the low-pressure separation tank, and oil phase at the bottom of the low-pressure separation tank is conveyed to a fractionation device to perform precise fractionation; (3) preheating the oil phase and feeding into a light component removal tower of the fractionation device to remove light components with fraction of less than 59 DEG C; (4) introducing remaining fractions of light component removal into an isohexane removal oil tower of the fractionation device to obtain high-purity isohexane; and (5) introducing the remaining fraction of isohexane removal into a normal hexane removal oil tower of the fractionation device to obtain the normal hexane. The process method has the advantages of simple and practical process, simple equipment, convenience in operation and stable and reliable product quality.

Description

technical field [0001] The invention belongs to the technical field of petrochemical separation methods, in particular to a process for extracting n-hexane and isohexane from crude hexane. Background technique [0002] n-Hexane is one of the most widely used hydrocarbon solvents in industry today. It is mainly used as a solvent for the polymerization of olefins such as propylene, as an extractant for edible vegetable oil, as a solvent for rubber and paint, and as a thinner for pigments. At present, industrial grade n-hexane products with a purity of 60%~80% (wt) are obtained mainly from the rectification and separation of platinum reforming raffinate. due to C 6 The boiling points of distillates are very similar (such as n-hexane at 69°C and methylcyclopentane at 71.8°C), so it is difficult to separate them by ordinary rectification. Precision rectification has high energy consumption, high production cost, and low yield, and it is difficult to obtain n-Hexane >99% (wt) ...

Claims

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Application Information

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IPC IPC(8): C07C9/15C07C9/16C07C7/163C07C7/04
Inventor 王进才牛同治张文绍王银盘赵华孟立柴丽娜张红涛赵雷刘加全
Owner 洛阳金达石化有限责任公司
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