A kind of method for preparing oxidized wax from coal wax

Abstract

The invention relates to a process for preparing oxidized wax from coal wax, comprising the following steps: preparing raw material F-T coal wax, adding it to a three-necked flask, gradually heating up to 100°C and melting it; adding F-T coal 0.1%~1.0% catalyst for wax production; 0.2~0.8L / h of oxygen is introduced into each gram of F-T coal wax, and the reaction temperature at this stage is controlled at 125°C~160°C. After 3~8 hours of reaction, The product was removed while hot and a sample was taken for analysis. In the present invention, F-T coal-based wax is used instead of traditional paraffin to prepare oxidized wax, which alleviates the pressure of shortage of petroleum resources and improves the economic added value of coal-based wax; without using heavy metal ion catalysts, nitrogen protective gas, water-carrying agents and polymerization aids, etc. Materials: The reaction time is short, the operation is simple, the prepared oxidized wax product has light color and light odor, and the acid value and saponification value meet the requirements of South Africa's SASOLWAX A28 index; this process does not require special processing equipment.

Description

Technical field [0001] The invention relates to the preparation field of oxidized wax, in particular to a method for preparing oxidized wax from coal wax. Background technique [0002] Wax has a wide range of uses in the rubber and plastic industry, coatings, inks, and daily chemical industry. Wax has undergone various degrees of oxidative modification, and its long linear chain is equipped with hydroxyl, carboxyl, and ester groups to have a certain degree of polarity. It has better compatibility with polymer resins, organic and inorganic pigments and fillers. It can be emulsified in water, thus expanding the application range of wax. [0003] The wax may include paraffin wax, microcrystalline wax, Fischer-Tropsch wax, polyethylene wax, polypropylene wax, and the like. The indicator of the degree of oxidation of the wax can be the acid value of the oxidation product of the wax, that is, the number of milligrams of KOH required to neutralize 1 gram (g) of the sample, expressed in ...

AI Technical Summary

Problems solved by technology

[0005] The literature [Development and Application of Paraffin Wax Oxidation Modification, Liaoning Chemical Industry, 2009,38(9): 670~673] discloses: Although my country has made some progress in the development of oxidized wax in recent years, there are the following deficiencies : No large-scale development, production and application situation has been formed; the oxidized wax has dark color, heavy smell and poor quality; indicators such as acid value and saponification value cannot meet the demand and limit its use; Quality and other impurities

[0006] CN103468316A discloses a kind of preparation method of high-acid soap oxidized wax, discloses the method for preparing oxidized wax with manganese salt (manganese sulfate) as catalyst, although this product acid value reaches 23.71mgKOH / g, saponification value reaches 49.13mgKOH / g, However, in an oxygen atmosphere, metal ions will be oxidized to produce metal oxides and other by-products, which will deepen the color of the product and reduce the activity of the catalyst.

[0010] From the above-mentioned published patents and literatures, it can be seen that there are reports on the synthesis of microcrystalline wax from F-T wax, paraffin wax oxidation, and polyethylene wax oxidation. However, there is no report on the oxidation of F-T coal-based wax at home and abroad. The relevant research directions are worthy of further discussion.