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Method for phase-change wax decoloring

A phase-change wax, adsorption decolorization technology, applied in the field of phase-change wax decolorization, can solve the problems of harsh operating conditions, large equipment investment, complex process, etc., and achieve the effect of small environmental pollution, good effect and high yield

Inactive Publication Date: 2009-10-07
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of removing colored substances in paraffin is mainly hydrofining. Generally, in the presence of high-temperature and high-pressure catalysts, through reduction reaction, the nitrogen-containing and sulfur-containing heterocyclic compounds that produce color in paraffin are converted and removed. The advantage is that the product is of good quality. The removal of colored substances is complete. The disadvantage of this method is that the investment in equipment is large and the operating conditions are relatively harsh.
[0003] Chinese patent CN97100158.8 discloses a method for refining paraffin using a composite adsorbent. The composite adsorbent is used to absorb pigments in paraffin to prepare refined paraffin. The advantage of this method is that the decolorization rate is high, and the disadvantage is that the process is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: In this example, the phase change temperature of the phase change wax is 25°C, and its composition is mainly normal alkanes with 15 to 21 carbons, and its phase change enthalpy is above 120kJ / kg; activated clay complies with HG / T2569 -94 quality requirements.

[0023] Take 200 grams of phase-change wax with a phase-change temperature of 25°C, the color number is No. 8, heat it to 110°C, add activated clay with a mass of 8% of the phase-change wax, absorb for 1 hour, and obtain 182 grams of phase-change wax after filtration. No. 5; add 182 grams of phase change wax to activated clay with 8% phase change wax quality again, at 110 ° C, stir and adsorb for 1 hour, filter to obtain 163 grams of phase change wax, and the color number is No. 3; 163 grams of phase change wax To change the wax, add 2% activated clay by mass, stir and adsorb at 110° C. for 1 hour, and filter to obtain 158 grams of phase-change wax with a color number of No. 1. Put the activated clay o...

Embodiment 2

[0025] Example 2: In this example, the phase change temperature of the phase change wax is 25°C, and its composition is mainly normal alkanes with 15 to 21 carbons, and its phase change enthalpy is above 120kJ / kg; activated clay complies with HG / T2569 -94 quality requirements.

[0026] 370 grams of phase change wax is heated to 110 ° C, add activated clay with 4% of the quality of phase change wax, stir and adsorb for 1 hour, filter to obtain 351 grams of phase change wax, and the color number is 6; add its mass to 351 grams of phase change wax 2% activated clay was stirred and adsorbed at 110° C. for 1 hour to obtain 336 grams of phase change wax, and its color number was 1; the activated clay obtained by the above three adsorption processes was put into 80° C. Stop stirring after 10 minutes, allow it to settle naturally, phase change wax can be obtained in the upper layer, and the phase change wax color number is greater than No. 9.

Embodiment 3

[0027] Example 3: In this example, the phase change temperature of the phase change wax is 25°C, and its composition is mainly normal alkanes with 15-21 carbons, and its phase change enthalpy is above 120kJ / kg; activated clay complies with HG / T2569 -94 quality requirements.

[0028] 318 grams of phase change wax, add 6.4 grams of activated clay with 2% of the quality of phase change wax, stir and adsorb at 110°C for 30 minutes, filter to obtain 309 grams of phase change wax, and the color number is No. 6; add active clay to 309 grams of phase change wax. 6.2 grams of white clay, stirred and adsorbed at 110°C for 30 minutes, filtered to obtain 300 grams of phase change wax, the color number is No. 4; 6 grams of activated clay was added to 300 grams of paraffin, the adsorption temperature was 110°C, and the adsorption time was 30 minutes, and the phase change wax was obtained by filtration. 292 grams of phase-change wax, color No. 2; add 5.8 grams of activated clay to 292 grams ...

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Abstract

The present invention relates to a method for refining phase-change wax. The method includes steps as follows: melting the phase-change wax under 100-300 deg c, contacting with active clay by 2%-8% weight of the phase-change wax, adsorption reaction about 60 minutes, separating the active clay with the phase-change wax, stirring the phase-change wax with 2%-5% active clay under 100-300 deg c about 60 minutes, and removing colouring substance in the phase-change wax by repeating above steps for obtaining the phase-change wax with low colour tint; mixing the carclazyte with water under 60-95 deg c, separating and obtaining coarse phase-change wax, the obtained waste carclazyte does not contain the phase-change wax and colouring substance basically. The method has advantages of low manufacture cost, simple and easy to operation, little phase-change wax loss and less environmental pollution by the waste carclazyte.

Description

technical field [0001] The invention belongs to the technical field of chemical processing, and in particular relates to a method for refining phase change wax, in particular to a method for decolorizing phase change wax. Background technique [0002] With the increasingly prominent energy problems, phase change materials have been widely used, such as in building energy saving, biological product transportation, solar energy storage devices, sporting goods, and spacecraft; in terms of composition, phase change materials can be roughly divided into two types: Class: Hydrated inorganic salts and organic phase change materials. Organic phase change materials include paraffin wax, partial straight-chain fatty acids, fatty alcohols, and partial esters, and can be selected from these substances according to the temperature to be used. Since paraffin is mainly composed of normal alkanes, its chemical properties are stable, and the number of carbon atoms is distributed in a wide r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G73/42
Inventor 郑立辉范国枝王敏宋光森
Owner WUHAN POLYTECHNIC UNIVERSITY
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