Process for preparing oxidized wax from coal wax

Abstract

The invention relates to a process for preparing oxidized wax from coal wax. The process comprises the following steps of preparing for a raw material, namely F-T coal wax, adding F-T coal wax into a three-neck flask, gradually heating to 100 DEG C and melting the F-T coal wax; then, adding a catalyst, wherein the weight of the catalyst accounts for 0.1-1.0% of the weight of the F-T coal wax; and introducing 0.2-0.8L/h oxygen gas to each gram of F-T coal wax, controlling the reaction temperature within 125-160 DEG C at the stage, reacting for 3-8 hours, then, taking out the product while the product is hot, sampling and analyzing. According to the process, the oxidized wax is prepared from the F-T coal wax instead of the traditional wax, so that the burden of petroleum resource shortage is relieved, and the economic additional value of the coal wax is increased; materials such as a heavy metal ionic catalyst, nitrogen shielding gases, a water-carrying agent and polymerization additives are not used; the reaction time is short, the process is simple and convenient to operate, the prepared oxidized wax product is light in color and smell, and the acid value and saponification value of the prepared oxidized wax product meet the requirements of the SASOLWAX A28 index of south Africa; and no special processing equipment is required in the process.

Description

Technical field [0001] The invention relates to the preparation field of oxidized wax, in particular to a process for preparing oxidized wax from a medium 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 straight 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, expres...

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.