Sulfuration type hydrocracking catalyst and preparation method thereof

Abstract

The invention discloses a sulfuration type hydrocracking catalyst and a preparation method thereof. The catalyst is a bulk phase hydrocracking catalyst and comprises sulfides of hydrogenation active metal components W and Ni, aluminum oxide, silicon oxide and molecular sieves, wherein ratio of the weight content of the sulfide of a surface phase active metal component W (by WS2 ) to that of the sulfide of a body phase active metal component W is (2.0 to 1) to (7.0 to 1), and the ratio of the weight content of the sulfide of a surface phase active metal component Ni (by NiS ) to that of the sulfide of a body phase active metal component Ni is (1.5 to 1) to (5.5 to 1). The catalyst is particularly suitable for being used in single-segment hydrocracking technological processes, and has the advantages of being high in liquid yield, good in product quality and the like.

Description

technical field [0001] The invention relates to a sulfurized hydrocracking catalyst for treating heavy hydrocarbons and a preparation method thereof. Background technique [0002] At present, the shortage of petroleum resources in the world, the quality of crude oil is deteriorating year by year, the demand for middle distillate oil is increasing, the upgrading of petrochemical products and the stricter environmental regulations have greatly promoted the transformation of heavy oil into lighter products, and constituted an accelerated development of hydrogenation. The power of technology. The main features of hydrocracking technology are strong adaptability of raw materials, high selectivity of product plans and target products, good product quality and high added value, and can directly produce a variety of high-quality petroleum products (such as gasoline, jet fuel, diesel oil, lubricating oil base Oil, etc.) and high-quality chemical raw materials (such as benzene, tolu...

AI Technical Summary

Problems solved by technology

The conventional catalyst sulfidation method adopts "in-vessel" pre-sulfurization, that is, the catalyst in the oxidized state is first loaded into the reactor, and then hydrogen and sulfide are fed into the reactor during the continuous heating process for pre-sulfurization. This method brings The following problems: (1) special vulcanization equipment should be set up on the hydrogenation unit; (2) the vulcanization agent added in the vulcanization process and the water and hydrogen sulfide generated by the reaction can easily cause corrosion of the high-pressure reactor and related equipment, resulting in Equipment damage and potential safety hazards; (3) The vulcanization process is longer, delaying the start time

(4) The vulcanizing agent used is flammable and toxic, causing pollution to the environment during the vulcanization process; (5) The cost of pre-vulcanization in the device is relatively high

The co-precipitation method adopted above will make the distribution of different hydrogenation active metals difficult to control, thereby affecting the distribution of different hydrogenation active metals and the interaction between different hydrogenation active metals and between the active metal and the carrier, so that the hydrogenation Hydrogen activity and cracking activity cannot be well coordinated. At the same time, the content of surface active metals in the catalyst is small and the density of active centers is low, which ultimately affects the hydrocracking performance of the catalyst.