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Method for producing n-decane, n-dodecane and n-tetradecane from polyethylene wax by-production light wax oil

A technology of n-dodecane and n-tetradecane, applied in the field of alkane production, can solve the problems of high equipment investment and long production process route, and achieve the effects of low equipment investment, short production process route and flexible process operation.

Active Publication Date: 2019-04-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a kind of method that polyethylene wax byproduct light wax oil produces n-decane, n-dodecane and n-tetradecane, to solve the problem of n-decane, n-dodecane and n-tetradecane in the prior art The problem of long production process route and high investment in equipment

Method used

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  • Method for producing n-decane, n-dodecane and n-tetradecane from polyethylene wax by-production light wax oil
  • Method for producing n-decane, n-dodecane and n-tetradecane from polyethylene wax by-production light wax oil
  • Method for producing n-decane, n-dodecane and n-tetradecane from polyethylene wax by-production light wax oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Use a polypropylene filter cloth with a filtration accuracy of 1-3 μm to filter the light wax oil, and the thickness of the polypropylene filter cloth is 1.0 mm.

[0031] The volume is 7m 3 Add 3 tons of light wax oil after filtering in the intermittent rectification tower still of the batch rectification tower, the add-on of light wax oil this moment is 3 / 5 of tower still volume, and the theoretical plate number of batch rectification tower is 20, Start the vacuum system, reduce the pressure of the batch rectification tower to 2.5KPa ~ 2.6KPa, then heat the light wax oil in the kettle, and when the temperature of the tower kettle rises to 90°C, there will be reflux at the top of the tower, and the total reflux operation will be performed first. After 30 minutes to 60 minutes, by adjusting the opening of the reflux and extraction valves, the reflux ratio at the top of the tower was controlled to be 2.5, and the former fraction was extracted. When the gas phase temperatu...

Embodiment 2

[0036] According to the operating steps of Example 1, the composition of the raw materials was changed, and the rest of the process conditions were the same as in Example 1. The test results are shown in Table 2.

[0037] Table 2

[0038]

[0039]

Embodiment 3

[0041] According to the operation steps of Example 1, the gas phase temperature at the top of the tower when controlling the production of n-decane is 73°C to 75°C, and the temperature of the gas phase at the top of the tower when producing n-dodecane is 108°C to 110°C. The gas phase temperature at the top of the tower is 139°C to 141°C at the time of tetraoxane, and the extracted materials at the other gas phase temperatures at the top of the tower all enter the fore distillation tank. All the other process conditions are the same as in Example 1, and the test results are shown in Table 3.

[0042] table 3

[0043]

[0044] According to the comparison of Example 1 and Example 3, it can be seen that when the temperature range of the gas phase at the top of the tower is reduced, the purity of the corresponding separated product increases.

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Abstract

The present invention provides a method for producing n-decane, n-dodecane and n-tetradecane from a polyethylene wax by-production light wax oil, wherein the method comprises: carrying out batch rectification on light wax oil to respectively obtain n-decane distillate, n-dodecane distillate and n-tetradecane distillate. According to the present invention, the polyethylene wax by-production light wax oil is used as the raw material, such that the product containing n-decane, n-dodecane and n-tetradecane can be prepared without the single use of the chemical process so as to reduce the equipmentinvestment; n-decane, n-dodecane and n-tetradecane can be obtained by carrying out batch rectification on light wax oil, such that the method has characteristics of short process route and low equipment investment; and the operation of the method is flexible, wherein the change of the one-component n-alkane content in the product can be controlled at 95-99% by adjusting the range of the recoverytemperature section.

Description

technical field [0001] The invention relates to the field of alkanes production, in particular to a method for producing n-decane, n-dodecane and n-tetradecane by-product light wax oil from polyethylene wax. Background technique [0002] Single-component n-alkanes (single-component content greater than 95%) are widely used, and n-decane is currently the first choice for high-grade green electronic dry cleaning agents; n-dodecane is an aerosol insecticide, pesticide, and high-end detergent. The main solvent of chemical products; n-tetradecane can be used as a solvent for veterinary drug preparations, liquid mosquito coils, hydraulic oil for large stamping machines, chlorinated paraffins, anti-corrosion coatings, powder coatings and other products. [0003] At present, there are few introductions about the production technology of single-component n-alkane in China. Zhang Zhiyin and others developed a method for preparing n-tetradecane or n-hexadecane with natural acid, and ap...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07C9/15
CPCC07C7/005C07C7/04C07C9/15
Inventor 阳军孟繁辉贾娟利李伟张成业
Owner PETROCHINA CO LTD