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

A technology of n-hexane and heptane, which is applied in the field of preparation of high-purity n-hexane and high-purity n-heptane, can solve the problems of being unsuitable for large-scale industrial production, high production cost, and high raw material requirements, and achieves low production cost and smooth production process. Easy to achieve, high product purity

Active Publication Date: 2021-06-01
SINOPEC YANGZI PETROCHEM +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic synthesis can be obtained by hydrogenation of unsaturated hydrocarbons, the production cost is expensive, and it is not suitable for large-scale industrial production
Separation from petroleum fractions. At present, it is mainly produced from reformed raffinate (93-102°C) fractions in industry. It has high requirements for raw materials, complicated process and high cost.

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0026] As an example in Table 1, on the rectification experimental device (10 liters still, packing plate number 30), control the reflux ratio 5-15, the naphtha adsorption separation extraction oil is carried out rectification separation, obtains high-purity n-hexane and high-purity The pure n-heptane product, hydrocarbons and yields of raw materials and products are shown in Table 1, and each composition is measured by gas chromatography.

[0027] Table 1 The hydrocarbon composition and yield of high-purity n-hexane and high-purity n-heptane products produced by rectification

[0028]

[0029]

[0030]

Embodiment 2

[0032] exist figure 1 On the device of the actual four-tower sequential rectification shown, according to the change in the properties of the oil raw material A and raw material B extracted from the naphtha adsorption separation, as shown in Table 2, the process parameters are adjusted. 99% high-purity n-hexane and 99% high-purity n-heptane were obtained respectively.

[0033] Table 2 Process parameters for producing high-purity n-hexane and high-purity n-heptane by four-tower sequential distillation

[0034]

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Abstract

The invention discloses a method for preparing high-purity n-hexane and high-purity n-heptane, which uses naphtha adsorption and separation oil as a raw material. The present invention absorbs and separates the naphtha to extract the oil, and through rectification processing, a high-purity n-hexane solvent product with a purity >99% and a high-purity n-heptane solvent product with a purity of 99% can be obtained; the recovery yield can reach >80% and >78%. Using the preparation method of the present invention to produce high-purity n-hexane and high-purity n-heptane has the characteristics of short separation process, easy production process, stable production control, high product purity, high product yield, stable quality, low production cost, etc., and is easy to organize Large-scale and specialized production, the process route does not require complex processes such as more stages of circular distillation or extractive distillation.

Description

technical field [0001] The invention relates to a preparation method of high-purity n-hexane and high-purity n-heptane, which belongs to the fields of petroleum refining and petrochemical industry. Background technique [0002] N-alkane solvents are mainly C6-C16 n-alkanes. High-purity single-carbon n-alkane solvents generally require n-alkane content as high as 95% or even more than 99%, and low impurity content. Commonly used are n-hexane and n-heptane alkane, n-dodecane, n-octane, n-nonane, n-decane, n-undecane, n-tetradecane, n-tridecane, n-hexadecane, etc. N-paraffin solvents are generally environmentally friendly products processed by hydrorefining and other technologies. They have low viscosity, low aromatic content, sulfur and nitrogen content. The demand for ultra-high purity and high chemical stability solvent products in various application fields is increasing. For enterprises, this kind of high-purity solvent has high added value and is a direction for future d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C9/15C07C7/04
Inventor 张斌
Owner SINOPEC YANGZI PETROCHEM
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