White oil, alias paraffin oils, mineral oils, is the highly refined colorless oily liquid with odorless, and has excellent chemical and light stability. It is widely used in industries such as cosmetics, food, pharmaceutical, plastics, chemical fiber, machinery and light industry.

Hydrogenation method to prepare white oil often bases on the material of hydrocracking tail oil, and dewaxed by solvent or catalytic, and then generated by high-pressure hydrogenation nickel catalyst saturating; with the advantages of no pollution, high yield, wide source of raw materials, full product range, etc., it gets rapidly development and universal application.

 

The specific process of hydrogenation process for producing high quality white oils include: under the suitable conditions, oil feedstock and hydrogen successively go through the reaction zone which contains three catalysts, the first reaction zone packed with a hydrotreating function catalyst, the second reaction zone loaded with the pour function catalyst, and the third reactor zone packed with a hydrogenation saturation function catalyst. The packing volume ratio of catalysts in three reaction zones can be 0.2~0.6:0.2~0.6. Reaction conditions: temperature 220~360 ℃; hydrogen partial pressure of 2.0~16.0MPa; the liquid hourly space velocity is 0.2~3.0 hours; the ratio of hydrogen and oil is 120~1000.

 

The three catalysts are:

1. Pre-hydrogenation refining catalyst, the aluminum oxide as carrier adding with other refractory oxide, the main components: cobalt oxide or nickel oxide, 15 ~ 40wt% of tungsten trioxide or molybdenum oxide;

2. The high activity of hydrodewaxing catalyst, which contains 3~25% of tungsten trioxide, 2-10% of molybdenum trioxide, 1-10% of nickel oxide, 1-8% of zinc oxide, 1-10% of tin oxide;

3. The high activity hydrofinishing catalyst, which the content of cobalt oxide or nickel oxide is 2~10wt%; content of tungsten trioxide is 15 ~ 40wt%.