Method for prolonging running period of hydrotreatment device

Abstract

The invention discloses a method for prolonging the running period of a hydrotreatment device. According to the method, during the steady-state inactivation stage of a hydrotreatment catalyst, a reactor is cooled, raw oil is switched to cleaning oil, low hydrogen-oil ratio is maintained, and the largest amount of inlet oil is used to flush a catalyst bed; the temperature of the catalyst bed is raised, and a certain proportion of a scale inhibitor is poured into the cleaning oil, and cyclic operation doesn't start until there is no solid char particles in oil generated at the tower bottom of a fractionate tower; and the temperature is adjusted, and supplementary vulcanization of the catalyst is carried out by pouring a vulcanizing agent into the cleaning oil so as to raise the activity of the catalyst. By the adoption of the method, decoking and supplementary vulcanization are simultaneously realized during the cleaning process of the catalyst, thus greatly reducing pressure drop of the catalyst bed, alleviating rising tendency of the pressure drop and prolonging the operating life of the catalyst. Therefore, the running period of the device is prolonged.

Description

technical field [0001] The invention relates to an on-line cleaning method of a hydrotreating device, especially for solving the problems of reduced catalyst activity and increased pressure drop of the device due to the enrichment of coke and polymer in the catalyst. Background technique [0002] The hydroprocessing process is generally in the presence of hydrogen, using a suitable reactor form, under certain operating conditions, the hydrocarbon feedstock and hydrogen are contacted with the hydroprocessing catalyst, there are fixed bed, ebullating bed, suspension bed, moving bed And so on four types. Hydrotreating catalysts generally use refractory oxides such as alumina, silicon aluminum, and molecular sieves as carriers, and one or more active metal components such as molybdenum, tungsten, cobalt, and nickel. Sometimes the catalyst can also contain phosphorus, silicon, Fluorine, titanium, boron and other auxiliary components. No matter which process is used, problems su...

AI Technical Summary

Problems solved by technology

These patents use conventional hydrotreating catalysts to carry out hydrotreating under conventional process conditions, usually using a one-pass process. Due to the influence of increasingly heavy and poor raw material oil, the sulfur and nitrogen content of the product can only be reduced under harsh conditions , or before the life of the catalyst is reached, due to the deposition of coke and polymers, the pores of the catalyst are blocked, resulting in an increase in pressure drop, uneven distribution of liquid in the bed, and local hot spots and other undesirable phenomena

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