Hydrocracking Of Vacuum Residue Under Self-sulfide And Oil-Soluble Catalyst

Recently,the process of crude oil has become more difficult because of the resources of crude oil are becoming inadequate and heavier.The demand of high value petroleum products is increasing because of the environmental problems and rigorously environmental protection law of the world.These promote the development of heavy oil processing technology.Heavy oil hydroconversion process and the light-end products of heavy oil has become the focus to study.And hydrocracking of heavy oil is an efficient way to solve these problem.The synthetize method of several kinds of self-sulfide and oil solubility catalysts was studied in this paper.These catalysts' properties such as crystalline phase,purity,constitution and oil solubility,were characterized by several ways.Simultaneously,the synthetize method was simple and quick,and the feature of the catalyst was high yield,high purity and high content of Mo.The microcrystalline state MoS2 was obtained by in-situ decomposition of precursors without external sulfurizing agent.One of the catalyst CTATTM has the ability to inhibit the reunion of the MoS2 nano-particles because the existence of alkylammionium with long alkyl chain.It performed a good dispersity in wax oil and vacuum residue.Also has a better ability in desulfurization and inhibition of coke.The optimal synthetize method was found after compare with the sequence of material addition.Another catalyst particle NiMoS4 was made base on the use of ATTM.At the same time,two more kinds of ammonium thiomolybdate were synthetized,the content of Mo achieve to 30%,performing some ability in diesel.Different pressure conditions were selected in hydrocracking to study the effect of high pressure?reaction pressure was 22MPa?on hydrogenation reaction.Using CTATTM as the catalyst and the wax oil as the feed.Simultaneously,the yield of gas,naphtha,and AGO was increased and the property of light-end product of wax oil was improved through high reaction pressure.The optimal reaction pressure was found as 6MPa after contrast the different pressure condition which using wax oil reacted in the high-pressure reaction kettle.Different conditions were selected in hydrocracking to study the effect of reaction conditions and high reaction pressure on hydrogenation reaction.Using CTATTM as the catalyst and the vacuum residue as the feed.Simultaneously,the yield of gas,naphtha,and AGO was increased and the property of light-end product of wax oil was improved through high reaction pressure and high reaction temperature.And the conversion was also promoted obviously.The density of products were reduced.A high concentration of catalyst will reduce the reaction effect,give rise to generate coke.However,high pressure is good for inhibition of coke and the aggregation.Gathering comprehensive matters such as the removal of heteroatom,conversions and the property of equipment,the optimal reaction condition was found.The concentration of catalyst was 200 ug/g^-1,the temperature was 430?,the various hydrogen pressure was 7MPa,and the reaction time was 1h.