简介:Factorsaffectingfoulingofdepentanizerinethyleneunitswereexploredthroughstudyofthecompositionofpyrolysisgasoline,C5distillateandfoulingdepositsfromthedepentanizerwhiletakingintoconsiderationtheprocessingparameters.Avarietyofantifoulingmeasures,inparticulartheinjec-tionofaspecialanti-foulingagentintotheCsgasphasepipelineandtheC5distillaterefluxpipelinewereintroduced.Commercialevaluationtestofamultifunctionalanti-foulingagent,theRIPP-1404anti-foulingagent,wasalsodescribed.
简介:Vibrationsofoffsetprintingpressesareseriousproblem,whichcausemanydifficultieswhileprintingandimpairqualityoftheprints.Thebiggestproblemliesinconstructionofprintingunit.Itmainlyconsistsofthreecylinders,buttwoofthemareinadirectcontactgenerateundesiredvibrations.Constructionofthecylindersmakesthatstiffnessoftheunitvariesperiodicallywhileprinting.Inthispapermodelofoffsetprintingunitispresented.Themodelisdescribedbythesystemoftwoparametricdifferentialequations.Computersimulationsofthebehaviouroftheprintingunithavebeenperformed.Conditionsinwhichparametricresonanceappearsarealsoappointedhere.