Catalyst pre-wetting
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The catalyst requires pre-sulfurization, and it also needs to be pre-wetted first. What does pre-wetting mean? What does it mean that there is a dry zone in the catalyst bed?
Pre-wetting means that oil infiltration is carried out right when the oil is introduced, during which a slight temperature wave occurs in the bed layer. I don’t know what “dry zone” means; I’m not sure if it refers to the drying of the catalyst. Please help me out, experts.
Wet sulfiding requires the catalyst to be wetted by sulfurizing oil, while dry sulfiding does not
The term \"dry area\" refers literally to areas that are not wet; in places where wetting does not occur, the vulcanization effect is poor
Pre-wetting probably means running the medium through the catalyst bed first! Then pre-vulcanizing will improve the effect of pre-vulcanization
First, you need to determine whether you are using wet vulcanization or dry vulcanization. The original poster mentioned it earlier. Wet vulcanization requires pre-wetting, while dry vulcanization does not. Pre-wetting is actually quite simple: it involves passing low-nitrogen diesel through the catalyst bed. First of all, pre-wetting can increase the flow rate of the liquid. Second, ensure safe contact between the catalyst’s pores and hydrocarbons, eliminating dry areas on the catalyst surface. The dry zone refers to the part of the catalyst where pre-wetting has not taken place with any liquid.
The main functions of pre-wetting are: 1. To keep the catalyst particles in a wet state and prevent the formation of dry areas in the catalyst bed； 2. Adsorb sulfides in sulfur-containing oils onto the catalyst to prevent the active metal oxides from being reduced by hydrogen ； 3. Avoid the impact of water on the quality of the catalyst.