Ex-situ presulfuration method for hydrogenation catalyst

Abstract

The invention belongs to the field of catalysts, and especially relates to an ex-situ presulfuration method for a hydrogenation catalyst. The method concretely comprises the following steps: immersingthe hydrogenation catalyst in an organic solvent containing industrial vitamin C, and carrying out reduction pretreatment at 80-100 DEG C for 5-10 h; adding sulfur and ammonia water having a concentration of 23-25% into a reactor, heating the added substances to 120-140 DEG C, and carrying out a reaction for 3-4 h to generate ammonium polysulfide; introducing an olefin gas into the reactor, carrying out heat insulation treatment under a pressure of 5-10 MPa for 24-36 h; cooling the reactor to room temperature after the reaction is finished in order to obtain a sulfuration agent; and adding the pretreated catalyst to the sulfuration agent, adding the olefin gas, carrying out heat treatment to sufficiently sulfurate the catalyst, passivating the sulfurated catalyst in a container filled aninert gas, and carrying out constant temperature treatment for 10-12 h. The method has the advantages of simplicity in process operation, low cost and small in environmental pollution, and is suitablefor industrial production.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to an external presulfurization method of a hydrogenation catalyst. Background technique [0002] With the reduction of oil reserves, crude oil is becoming more and more serious. In order to make full use of resources and reduce environmental pollution, hydrogenation technology has become a very important link in the oil refining industry. Hydrogenation catalysts are mainly active metals such as W, Mo, Ni, Co, etc., but they are usually in an oxidized state, and the catalyst must be converted into a sulfurized state before use to have a high catalytic activity. Therefore, the presulfurization of hydrogenation catalysts is very critical. [0003] The presulfurization method of catalyst can be divided into internal presulfurization and external presulfurization according to the way of sulfur loading. Pre-sulfurization in the vessel has disadvantages such as high equipment investment and lon...

AI Technical Summary

Problems solved by technology

In patents such as CN1262305, US4719195, and US5139990, the method for pre-vulcanization outside the device has been reported, but the existing method for pre-vulcanization outside the device has the disadvantages of low vulcanization rate, high cost, and harmful substances.

Existing synthetic methods are not easy to industrialized production, and it is urgent to seek a method for hydrogenation catalyst presulfidation that is easy to operate, low in environmental pollution, and cheap in cost.