Abstract: A combined hydrogenation process and system for producing chemical raw materials are provided. The process has the following steps: (1) performing a hydrogenation pretreatment reaction on a wax oil raw material and hydrogen-containing gas, mixing the hydrogenated wax oil obtained by means of the reaction and a light diesel oil fraction, and performing a first hydrocracking reaction to obtain a first hydrocracking material flow; (2) separating and fractionating the first hydrocracking material flow to obtain a diesel oil fraction; and (3) performing a second hydrocracking reaction on the diesel oil fraction obtained in step (2) to obtain a second hydrocracking material flow, and separating and fractionating the second hydrocracking material flow. The process can transform all the high aromatics inferior diesel oil raw materials and wax oil raw materials into light naphtha, heavy naphtha tail oil and other high value-added products.

Abstract: The present invention relates to a wet start-up method for hydrogenation unit, an energy-saving hydrogenation process, and a hydrogenation apparatus. The method involves heating a start-up activating oil to a specific temperature and flowing the heated oil through a bed of hydrogenation catalyst bed, so that the temperature at the catalyst bed layer is increased to 180±10° C. or above by means of heat exchange and the reaction heat generated from activation in the start-up method.

Abstract: The present invention relates to a wet start-up method for hydrogenation unit, an energy-saving hydrogenation process, and a hydrogenation apparatus. The method involves heating a start-up activating oil to a specific temperature and flowing the heated oil through a bed of hydrogenation catalyst bed, so that the temperature at the catalyst bed layer is increased to 180±10° C. or above by means of heat exchange and the reaction heat generated from activation in the start-up method.