The Industrial Application About The Oefins Removal Technology In The Reaction Products Of Catalytic Reforming

Catalytic reforming process is an important process for the blending of aromatic products and high octane gasoline.The world crude oil tends to be heavy and inferior,and the ratio of straight distillation naphtha production decreases.Naphtha cracking for ethylene and catalytic reforming for naphtha feedstock;The reforming unit gradually adds hydrocracking naphtha,hydrotreating naphtha,catalytic cracking naphtha,etc.The same reforming catalyst should be used for reforming raw materials of various proportions;The reformer is developing towards large scale and high rigor(low partial hydrogen pressure,high air speed).Environmental protection and chemical product quality upgrade gradually limit the olefins in the reforming oil.Under the influence of these factors,the olefins in the reformated oil gradually received attention.In addition to the traditional clay adsorption technology,the molecular sieve adsorption technology and the noble metal catalyst liquid phase hydrogenation technology were gradually developed and widely used.The main use of the reformated oil is to produce high octane gasoline blending components.Aromatic products benzene,toluene,xylene(BTX)are produced through aromatics extraction and fractionation plant.Solvent oil is produced from the residual oil after aromatics extraction.The olefins in the reformated oil will have adverse effects on these products.The olefins in the reformated oil can be removed by clay adsorption,molecular sieve adsorption and liquid phase hydrogenation of noble metal catalyst.Through careful study and comparison of the three deolefin processes,it is found that granular clay will be gradually replaced by molecular sieve adsorbent process and liquid phase hydrogenation process which can be regenerated for many times due to short service life,frequent change of agent and increase of labor intensity,and not conducive to environmental protection.Molecular sieve adsorbent deolefin process has the advantages of small change momentum,low one-time investment cost,low operation cost,etc.Molecular sieve adsorbent research direction is towards adsorption capacity and adsorbent regeneration,Multiple directions;Compared with liquid-phase hydrodeolefin technology,although the investment cost is high and the operation cost is high,it is more environmentally friendly.With the continuous development of new liquid-phase hydrogenation catalyst,the catalyst cost will be further reduced,which will become the main process of oil deolefin from reforming in the future.In this paper,on the basis of three kinds of craft contrast,combined with the oil generation of three plant oil introduced.it industrial practical application situation,discuss three oil factory select reforming generated oil olefin technology applications,including reforming generated oil production plant of high octane number gasoline,producing BTX aromatics products and reforming raffinate oil production of solvent oil.This process makes up for the shortcomings of clay adsorption technology and molecular sieve adsorption technology.It is more environmentally friendly and more conducive to the long-term stable operation of the device.The hydrogenation reaction of this process is mild,the aromatics saturation is small,the energy consumption is relatively low,and the operation cost is relatively low,which is especially suitable for the production of BTX device.Secondly,the dho-18 catalyst has a long operating cycle,and can be regenerated about 6 times after deactivation,with a total life of 8 years.After the failure of the catalyst,the precious metal in the catalyst can be recycled.The active components used in the catalyst are precious metals platinum and palladium,and the content of platinum and palladium in the catalyst is not less than 0.26%.Combined with the implementation of FHDO technology in the plant,the whole life cycle of a construction project is introduced in detail.Including the project decision-making and project implementation process.Specifically,the preliminary research of the project,the preparation of the project proposal and the preparation of the feasibility study report;The compilation of basic design and construction drawing design,the whole process of project construction and operation.After the application of FHDO technology,the olefin content in the reformated oil meets the requirements of the downstream aromatics extraction for mixed aromatics feed,and the bromine index is 1,900-3000 mgbr /100 g,which is lower than 300mgBr/100 g,ensuring that the bromine index in the aromatics product is no more than 20mgBr/100 g.The aromatics loss rate of reformated oil was controlled under 0.3 %.The problem and solution of excessive pressure drop in FHDO process are discussed.When the pressure drop is too large,the relevant parties jointly conduct a comprehensive investigation of the liquid-phase hydrogenation reactor,and the problem is solved by changing the relative position of the porcelain ball on the upper part of the reactor and the grid plate,and The causes of excessive pressure drop in the reactor were analyzed.With the national emphasis on safety and environmental protection,in addition to the safety,environmental protection and occupational health assessment,the project will increase the process hazard and operational analysis(HAZOP)and safety integrity level(SIL)assessment of the project in accordance with relevant standards and specifications.HAZAOP analysis method was applied to FHDO technology has carried on the system analysis,it is concluded that the new process unit residual risk of iiI are Ⅱ(6)for moderate risk,under the condition of the existing control measures to implement can be tolerated.