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A combined oxidation refining method of montan wax

A technology of oxidation refining and montan wax, which is applied in the recovery/refining of mineral wax, petroleum industry, etc., can solve the problems of high post-processing pressure, low bleaching degree, poor wax quality, etc., and achieve reduced usage and high whiteness , the effect of low energy consumption

Inactive Publication Date: 2015-09-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of chromium-containing oxidation are: the bleaching degree is relatively high, and the wax quality is better; the disadvantages are: the use of a large amount of heavy metal chromium ions brings about high post-treatment pressure and high energy consumption; and the advantages of chromium-free oxidation Yes: the waste liquid does not contain heavy metal ions and can be discharged directly, which is environmentally friendly and energy-saving; its disadvantages are: the bleaching degree is relatively low, and the wax quality is slightly inferior
The inventor has long been committed to the research on the oxidation and refining of montan wax, and knows that the optimization and improvement of technology will help to promote the innovation of the entire industry. At present, the method of combining two oxidation and refining technologies containing chromium and chromium-free is used in the application of oxidation and refining of montan wax No report

Method used

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  • A combined oxidation refining method of montan wax
  • A combined oxidation refining method of montan wax
  • A combined oxidation refining method of montan wax

Examples

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Effect test

Embodiment 1

[0023] Example 1: Oxidation and refining are carried out in three stages of chromium-containing initial bleaching section, chromium-free re-bleaching section, and drying and hot-melting section. The specific operations are as follows:

[0024] 1, be 60% sodium dichromate solution according to mass percentage concentration: mass percentage concentration is the mass ratio of 30% sulfuric acid solution=1:3 to be mixed with 30kg chromium-sulfur mixed acid solution, for subsequent use; 10kg degreasing montan wax is put into reactor , heated to 90°C under stirring conditions, then cooled to 50°C, then slowly added dropwise to 1 / 3 of the total volume of the chromium-sulfur mixed acid solution, and then heated to 100°C to drop the remaining liquid, and stirred at a constant temperature for 4 hours until When the mixed solution is dark green, stop heating, cool to the preliminary refined wax and condense, reclaim the waste liquid, then use a small amount of sulfuric acid solution with ...

Embodiment 2

[0029] Example 2: Oxidation and refining are carried out in the three-stage method of chromium-containing initial bleaching section, chromium-free re-bleaching section, and drying and hot-melting section. The specific operations are as follows:

[0030] 1. According to the mass percentage concentration of 40% potassium dichromate solution: the mass percentage concentration of 70% sulfuric acid solution = 1:1 to prepare 20kg of chromium-sulfur mixed acid solution for later use; put 10kg of degreasing montan wax into the reaction kettle , heat up to 110°C under stirring conditions and then cool to 60°C, then slowly add 1 / 2 of the total volume of the chromium-sulfur mixed acid solution dropwise, then raise the temperature to 120°C and drop the remaining liquid, and then stir and react at a constant temperature for 3 hours until When the mixed solution is dark green, stop heating, cool to the preliminary refined wax and condense, reclaim the waste liquid, and then use a small ...

Embodiment 3

[0035] Example 3: Oxidation and refining are carried out in three stages of chromium-free initial bleaching section, chromium-containing re-bleaching section, and drying hot-melt section. The specific operations are as follows:

[0036] 1. According to the mass ratio of peracetic acid solution with a mass percentage concentration of 20%: hydrogen peroxide solution with a mass percentage concentration of 30% = 1:1 to prepare a preliminary oxidation solution, and then according to the preliminary oxidation solution: oxidation stabilization aid ( 1:1 mixed powder of water-soluble chitosan and sodium silicate) = 1:0.02 mass ratio to prepare 20kg of oxidation mixture, and adjust the pH value to 7 for later use; put 10kg of defatted montan wax into the reaction kettle, and After heating to 90°C and melting under stirring conditions, divide 20kg of the oxidizing mixture into 5 parts and add it to the reactor at 85°C to stir for 1.5 hours. During this period, separate the former part...

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Abstract

The invention discloses a method for refining lignite wax by means of combined oxidation, and particularly discloses a method which integrates and optimizes an existing chromium-containing oxidation refining process and an existing chromium-free oxidation refining process. According to the method disclosed by the invention, degreased lignite wax is used as a raw material, a three-stage oxidation refining process is adopted, and combination can be performed according to the following two ways: (1) a chromium-containing primary-rinsing stage, a chromium-free re-rinsing stage and a drying and hot-melting stage; (2) a chromium-free primary-rinsing stage, a chromium-containing re-rinsing stage, and the drying and hot-melting stage. The method disclosed by the invention adopts the strong points to overcome the weak points on basis of playing of all the advantages of the two original processes, breaks through the upper limit of independent chromium-free oxidation refining and independent chromium-containing oxidation refining in product whiteness, and also effectively reduces the usage amount of chromium metal ions during the independent chromium-containing oxidation refining and the subsequent treatment pressure, so the method is an effective and practical method for oxidation refining of the lignite wax, which pursues higher whiteness and lower energy consumption, and higher-quality raw materials are provided for high-class application of a light-color lignite wax product as well; therefore the method has an important significance.

Description

technical field [0001] The invention relates to a combined oxidation and refining method of montan wax, in particular to a method for integrating and optimizing the existing chromium-containing and chromium-free oxidation and refining technologies. Background technique [0002] The oxidative refining method for removing dark substances in montan wax has always been a research focus and focus in the field of montan wax, because it is related to whether montan wax products can be developed and applied in high-end fields. At present, the oxidation and refining methods of montan wax are roughly divided into two categories: one is the traditional chromic anhydride, chromic acid and dichromate oxidation method (referred to as: chromium-containing oxidation) and the oxidation method represented by peracetic acid and hydrogen peroxide. method (abbreviation: chromium-free oxidation). The advantages of chromium-containing oxidation are: the bleaching degree is relatively high, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G73/00
Inventor 李宝才袁承张惠芬张敉
Owner KUNMING UNIV OF SCI & TECH