Research and Discussion on an Energy Saving Isobutene Selective Dimerization Process
An energy-saving isobutene selective dimerization process is provided.The C4 feed and gas-phase product come into countercurrent contact in a contact-type surge drum and undergo mass and heat transfer.Then,the post contact gas-phase product enters the reaction separation tower,and the post contact C4 feed is mixed with diisobutylene azeotrope and deoxygenated water as the reaction feed and enters the contact-type reactor.The contact-type reactor is equipped with a liquid level regulator to ensure that the dimerization re-action always operates in a liquid phase state.After the reaction is completed,the gas-phase product of the reactor is transferred to the contact-type surge drum for mass and heat transfer,and the liquid-phase product is transferred to the reaction separation tower for deep reaction and separation.The reaction separation tower includes a reaction section,which uses water and tert-butyl alcohol generated by the reaction of water and isobutene as a composite inhibitor;under the action of distillation,the C4 raffinate and diisobutylene azeotropes,as well as diisobutylene product are separated from the top,side draw,and bottom of the tower,respectively.The isobutene selective dimerization process has the characteristics of high reaction efficiency in contact-type reactor,all reaction heat is used for mass and heat transfer of components,and there is no need to set up tert-butyl alcohol secondary injection facilities in the reaction section of the reaction separation tower.It can maintain the basic constant temperature of the dimerization reaction,improve the selectivity of diisobutene,and significantly reduce the unit energy consumption.
selective dimerizationreaction heatdiisobutylenemass and heat transferazeotropecomposite in-hibitorsstream propertiesmaterial balancecontact
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