000084383 001__ 84383
000084383 005__ 20181203020407.0
000084383 02470 $$2DAR$$a2352
000084383 02470 $$2ISI$$a000088605500003
000084383 037__ $$aARTICLE
000084383 245__ $$aOn-line conversion monitoring through ultrasound velocity measurements in bulk styrene polymerization in a recycle reactor - part I: experimental validation
000084383 269__ $$a2000
000084383 260__ $$c2000
000084383 336__ $$aJournal Articles
000084383 500__ $$aCAN 133:238458
000084383 500__ $$a35-9
000084383 500__ $$aChemistry of Synthetic High Polymers
000084383 500__ $$aInstitute of Chemical Engineering,Swiss Federal Institute of Technology,Lausanne,Switz.
000084383 500__ $$aJournal
000084383 500__ $$a1054-3414
000084383 500__ $$awritten in English.
000084383 500__ $$a9003-53-6P (Polystyrene) Role: IMF (Industrial manufacture), PREP (Preparation) (monitoring of extent of conversion in bulk styrene polymn. by ultrasound velocity measurements)
000084383 520__ $$aUltrasound propagates through an elastic medium at a rate or speed named the ultrasound propagation velocity (UPV). This velocity is detd. by the rate at which the wave energy is transmitted, inversely related to the square root of the d. and compressibility of the medium. This technique is based on the increase of UPV with rising elasticity of the medium due to polymn. As monomer is transformed to polymer, both the d. and adiabatic compressibility change, making the UPV closely related to monomer conversion. Longitudinal waves are commonly employed in ultrasonic applications since they are easily generated and detected. The application of the UPV technique to follow the compn. evolution of the soln. during the polymn. reaction in a recycle tubular reactor is presented. The sensor can be directly inserted in the tubular reactor and does not require a sampling circuit. This makes its use particularly simple and suitable for lab. and industrial purposes. Another application of this technique is the direct measure of the residence time distribution (RTD), which affects both monomer conversion and polymer mol. wt. distribution. RTD measurements can also be used to detect any problem of fouling or plugging during the polymn. reaction and to follow the efficiency of the reactor clean up during the shut-down procedure of continuous polymn. processes. Exptl. validation of this technique during a bulk styrene polymn. is presented in this paper. Tech. parameters such as temp., pressure and flow speed, as well as medium parameters such as monomer conversion and polymer mol. wt. directly influence the UPV value. The quant. modeling of the UPV change during polymn. in order to calc. monomer conversion will be discussed in detail in a further paper (part II). [on SciFinder (R)]
000084383 6531_ $$aPolymerization (monitoring of extent of conversion in bulk styrene polymn. by ultrasound velocity measurements); Sensors (monitoring of extent of conversion in bulk styrene polymn. with ultrasound velocity sensors); Sound and Ultrasound (velocity; monit
000084383 6531_ $$astyrene polymn conversion ultrasound velocity monitoring
000084383 700__ $$aCavin, L.
000084383 700__ $$0241136$$aMeyer, Th$$g105841
000084383 700__ $$0240078$$aRenken, A.$$g106205
000084383 773__ $$j8$$k3$$q201-223$$tPolymer Reaction Engineering
000084383 909C0 $$0252033$$pLGRC$$xU10178
000084383 909C0 $$0252137$$pGSCP$$xU10177
000084383 909CO $$ooai:infoscience.tind.io:84383$$pSB$$particle
000084383 937__ $$aLGRC-ARTICLE-2000-008
000084383 970__ $$a107/LGRC
000084383 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000084383 980__ $$aARTICLE