Mass flow measurement of pigment and plastic additives production.

•Constantqualitymonitoringduringproductionwithchangingviscosities•Bulkmassflowmeasurementrightdowntoprecisedosing•Automaticdosingofchemicalsinamixingtank

1. Background Oneoftheworld'sleadingmanufacturersofpigmentandplasticadditivesalsoproducesinGermany.Duringtheproductionoftheadditives,upto8chemicalswithviscositiesvaryingbetweenapprox.50and400mPa·sareaddedinsequencetoamixingtank.TheFlowratesrangefrom20000kg/hdowntolowflowdosingat500kg/h.

Productstobemeasuredinclude•Xylolwithextremelylowviscosity,•Bupolwithaviscosityofapprox.200mPa·s,and•Polyglycolwithahighviscosityofapprox.400mPa·s.

2. Measurement requirements

Tokeeppumpcapacitytoaminimum,onlymassflowmeterswithasinglestraightmeasuringtubeareused.Thechemicalsusedtomanufacturethepigmentandplasticadditivesarestoredintanks,andthenflowthroughthemassflowmeterstothemixers.Accuracymustremainconstantwithallchangesinviscosity.Themeasurementsmustberepeatable.Withtheautomatedprocess,themassflowmetersaddtheexactamountofchemicalstothemixers.Themetersmustbeself-draining,easytocleanandmaintenance-free.

APPLICATION NOTE Chemicals

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3. KROHNE Solution

Followingcomparativetestswithothersuppliers,KROHNEsuppliedmassflowmetersfromtheOPTIMASS7300Cseries,insizesT06,T10,T25andT40fortheseapplications.

Themetersmeasuretheprecisemassflowofthevariouschemicalsflowingtothemixers.Oncethedesiredquantityhasbeenreached,theinstrumentsstoptheflowtothemixers.

ThesinglestraightmeasuringtubeoftheOPTIMASS7300Ccompactmeters,togetherwiththeverticalmountingofthedevices,enablecompletedrainageofthemeasuringtubeswithoutresidue.

4. Customer advantages

TheKROHNEOPTIMASSflowmetersconsiderablyreducedthefillingtimeofthemixers.Inaddition,thefillingofthemixersnowstopsautomatically.Preciseadherencetothemixingratiosofthechemicalsincreasesthequalityofthecolourandpaintadditives.Thelong-termstabilityandexcellentreproducibilityoftheOPTIMASSmetersalsocontributestothis.

Theincreasedinaccuracywhenfillingthemixerswiththevariouschemicalsincreasesproductquality.Self-drainageandthelackofneedformaintenancealsoloweroperatingcosts.

5. Products used

OPTIMASS 7300 C • TheonlymassflowmeterwithonestraightmeasuringtubeavailableinStainlessSteel,Hastelloy®,TitaniumorTantalum

• Minimalpressureloss• Anymountingposition,easilydrainedandeasytoclean• Highaccuracyevenwhenproduct,viscosityand/ortemperaturechanges

• Reliablemassflowmeterforthemeasurementofmassflow,density,volume,temperature,massandvolume,concentrationaswellassolidcontent

Contact

PleasevisitourwebsiteforacurrentlistofallKROHNEcontactsandaddresses.

APPLICATION NOTE

Details of the installed mass flowmeters

Application 172 EN.indd 2 01.02.2010 15:52:18 Uhr