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A kind of preparation method of high-purity n-hexane

A pure n-hexane technology, which is applied in the field of high-purity n-hexane preparation, can solve the problems of low n-hexane purity and achieve the effects of high resource recycling rate, low maintenance cost and low investment cost

Active Publication Date: 2022-03-04
SHANDONG CHAMBROAD PETROCHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process uses raffinate oil as raw material, and due to the limitation of its components, the purity of n-hexane prepared is generally lower than 99%.

Method used

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  • A kind of preparation method of high-purity n-hexane
  • A kind of preparation method of high-purity n-hexane
  • A kind of preparation method of high-purity n-hexane

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preparation example Construction

[0036] The invention provides a kind of preparation method of high-purity normal hexane, comprises the following steps:

[0037] a) carrying out a hydrogenation reaction of the reformed C5 oil and hydrogen under the action of a hydrogenation catalyst, and separating the C5 light component of the liquid phase product after the reaction to obtain the remaining heavy component;

[0038] b) separating the remaining heavy components obtained in step a) with isohexane to obtain heavy components after de-isohexane;

[0039] c) separating the heavy component obtained in step b) after deisohexanization with n-hexane to obtain high-purity n-hexane.

[0040] In the invention, the reformed C5 oil and hydrogen are subjected to a hydrogenation reaction under the action of a hydrogenation catalyst, and the liquid phase product after the reaction is subjected to separation of C5 light components to obtain the remaining heavy components. In the present invention, the reformed C5 oil preferabl...

Embodiment 1

[0070] The process flow chart of the preparation method of the high-purity n-hexane provided by the embodiment of the present invention 1 can be found in figure 1 As shown, the specific steps are as follows:

[0071] (1) Pass the reformed C5 oil and hydrogen into the hydrogenation reactor according to the hydrogen-to-oil ratio of 300:1, and carry out hydrogenation under the reaction pressure of 1.8MPa, reaction temperature of 138°C and JHO-1 raffinate hydrogenation catalyst Hydrogen reaction; the liquid phase product after the reaction enters the depentanizer (due to the large number of tray layers, it is composed of the depentanizer A tower and the depentanizer B tower in series, wherein the depentanizer A tower is a stripping tower, and the depentanizer A tower is a stripping tower. The pentane B tower is a rectification tower) to separate the C5 light components:

[0072] Control the temperature at the bottom of the depentanizer A tower to be 100°C to 120°C, the pressure a...

Embodiment 2

[0081] Adopt the preparation method that embodiment 1 provides, prepare high-purity normal hexane; Difference is:

[0082] In step (3), the temperature at the bottom of the n-hexane tower A is controlled to be 160°C to 170°C, the pressure at the bottom of the tower is 110KPa to 120KPa, the temperature at the top of the n-hexane tower B is 70°C to 78°C, and the pressure at the top of the tower is 30KPa to 50KPa , reflux ratio R3=4~6;

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Abstract

The invention provides a method for preparing high-purity n-hexane, comprising the following steps: a) performing hydrogenation reaction on reformed C5 oil and hydrogen under the action of a hydrogenation catalyst, and separating C5 light components from the liquid phase product after the reaction , to obtain the remaining heavy components; b) separating the remaining heavy components obtained in step a) with isohexane to obtain heavy components after de-isohexane; c) separating the heavy components after de-isohexane obtained in step b) with n-hexane , to obtain high-purity n-hexane. Compared with the prior art, the preparation method provided by the present invention uses reformed C5 oil as raw material, and adopts a specific process to prepare high-purity n-hexane. The preparation method provided by the present invention has simple process, low cost, no pollution, and can run stably for a long time ; and the purity of the prepared high-purity n-hexane is above 99%, and the product quality is stable.

Description

technical field [0001] The invention relates to the technical field of organic solvent n-hexane, more specifically, relates to a preparation method of high-purity n-hexane. Background technique [0002] High-purity n-hexane refers to n-hexane with a purity ≥ 99%, which is widely used as a diluent and advanced solvent for pharmaceutical synthesis reactions, such as co-reaction solvents for the preparation of sterile drugs such as steroids, hormones, and cephalosporins. The demand for high-purity n-hexane in domestic and international markets is increasing year by year. For example, large foreign pharmaceutical companies such as ECO in the United States and EVOLL in Switzerland all have a large demand for high-purity n-hexane. With the rapid development of domestic and foreign pharmaceutical engineering, biological genetic engineering and other related fields, the market demand for high-purity n-hexane will increase greatly in the next few years, and the market prospect is bro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C7/04C07C7/163C07C9/15
CPCC07C7/005C07C7/04C07C7/163C07C9/15
Inventor 齐明臣陈玉超栾波
Owner SHANDONG CHAMBROAD PETROCHEMICALS CO LTD
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