@misc{NarraAyGlaser, author = {Narra, Satyanarayana and Ay, Peter and Glaser, Claudia}, title = {Vorrichtung und Verfahren zur Agglomeration der Ablauge eines Cellulosegewinnungsprozesses}, language = {de} } @incollection{NarraLogschGlaseretal., author = {Narra, Satyanarayana and Logsch, Florian and Glaser, Claudia and Ay, Peter}, title = {Erzeugung von Bioagglomeraten auf der Basis ligninhaltiger Ablaugen der Papier- und Zellstoffindustrie}, series = {Effizient, umweltvertr{\"a}glich, dezentral - neue Konzepte f{\"u}r die Nutzung von biogenen Festbrennstoffen, Bd. 2}, booktitle = {Effizient, umweltvertr{\"a}glich, dezentral - neue Konzepte f{\"u}r die Nutzung von biogenen Festbrennstoffen, Bd. 2}, editor = {Thr{\"a}n, Daniela and Pfeiffer, Diana}, publisher = {DBFZ, Dt. Biomasseforschungszentrum}, address = {Leipzig}, pages = {247 -- 264}, language = {de} } @inproceedings{NarraGruhnAy, author = {Narra, Satyanarayana and Gruhn, M. and Ay, Peter}, title = {Production of carbon fibres from technical lignin granules}, series = {21st European Biomass Conference and Exhibition, Copenhagen, Denmark, 3 - 7 June 2013}, booktitle = {21st European Biomass Conference and Exhibition, Copenhagen, Denmark, 3 - 7 June 2013}, publisher = {ETA-Florence Renewable Energies}, doi = {10.13140/RG.2.1.2139.0886}, language = {en} } @inproceedings{NarraAslanjanAy, author = {Narra, Satyanarayana and Aslanjan, Jana and Ay, Peter}, title = {Macroencapsulation of biogas residues increasing the fertilizer efficiency}, series = {21st European Biomass Conference and Exhibition, Copenhagen, Denmark, 3 - 7 June 2013}, booktitle = {21st European Biomass Conference and Exhibition, Copenhagen, Denmark, 3 - 7 June 2013}, publisher = {ETA-Florence Renewable Energies}, doi = {10.13140/RG.2.1.3187.6642}, language = {en} } @misc{NarraGlaserAyetal., author = {Narra, Satyanarayana and Glaser, Claudia and Ay, Peter and Logsch, Florian}, title = {Verfahren zur Herstellung von wasserunl{\"o}slichen Lignin-Agglomeraten}, abstract = {Die Erfindung betrifft ein Verfahren zur Herstellung von wasserunl{\"o}slichen Agglomeraten aus Ablauge eines Cellulosegewinnungsprozesses. Erfindungsgem{\"a}ß umfasst das Verfahren die folgenden Schritte: 1. Durchf{\"u}hrung einer Granulation mit der Ablauge zur Erzeugung von Lignin-Agglomeraten und 2. Behandeln der erzeugten Lignin-Agglomerate mit einer S{\"a}ure.}, language = {de} } @misc{AyNarraGlaser, author = {Ay, Peter and Narra, Satyanarayana and Glaser, Claudia}, title = {System zur Rollagglomeration mit integrierter Entw{\"a}sserung}, language = {de} } @misc{DasguptaAyKommolketal., author = {Dasgupta, Sunanda and Ay, Peter and Kommolk, Ralf and Su, Xu}, title = {Kinetics of Melt Crystallization of a Sunflower Oil-Based Polyunsaturated Fatty Acid Mixture}, series = {Chemical Engineering \& Technology}, volume = {36}, journal = {Chemical Engineering \& Technology}, number = {7}, issn = {0930-7516}, doi = {10.1002/ceat.201200524}, pages = {1225 -- 1230}, abstract = {Important parameters like supercooling and cooling rates affecting the melt crys- tallization of a polyunsaturated fatty acid (PUFA) mixture obtained from sun- flower oil were investigated and compared via high-resolution polarized-light mi- croscopy. PUFA was thermally characterized in a differential scanning calorimeter and the significant liquid-solid-phase transition temperatures determined were then implemented in the development of specific temperature profiles. Analyzed between two glass slides, induction times were found to decrease with low crystal- lization temperatures and the number of nuclei per unit area increased with high- er supercooling and cooling rates. A comparison between the linear crystal growth rates of pure standards of each of the main fatty acids present in the PUFA mixture and the PUFA mixture itself indicated that the latter is much slower than that of each of its pure components.}, language = {en} } @inproceedings{DasguptaAy, author = {Dasgupta, Sunanda and Ay, Peter}, title = {In-situ monitoring and induction time measurements during melt crystallization of plant based fatty acid mixtures in V-form reactor}, series = {6th Workshop on Fats and Oils as Renewable Feedstock for the Chemical Industry Karlsruhe, March 17-19, 2013}, booktitle = {6th Workshop on Fats and Oils as Renewable Feedstock for the Chemical Industry Karlsruhe, March 17-19, 2013}, publisher = {abiosus e.V. Conferences}, address = {Karlsruhe, Germany}, abstract = {Enriched plant based unsaturated fatty acid mixtures are increasingly finding applications in various fields like those of production of bio-fuels and polymerization of epoxy resins. In the case of production of epoxy resins, they are highly advantageous due to the presence of multiple double bonds in the fatty acids which provide opportunities for cross linking by substitution. On the other hand, bio-fuels need raw materials with very low crystallization temperatures. This special property can also be attributed to these enriched unsaturated fractions due to their weak inter-molecular interactions owing to the kink in their structures. Melt crystallization has long been established as an optimal method for purification and enrichment of fractions from mixtures [1,2]. Previous studies have shown promising results with regard to enrichment of unsaturated fractions by melt crystallization processes [1]. Melt crystallization kinetics of two plant based poly-unsaturated fatty acid mixtures have been investigated in this study [3]. A high oleic and a high linoleic fatty acid mixture were chosen for comparison purposes. A V-form reactor was developed for optimal in-situ analysis with the help of the focused beam reflectance measurement (FBRM®, Mettler Toledo Ltd., Switzerland) instrument [3]. Enhanced heat transfer especially to deal with the heat given out during crystallization was enabled through minimal volume of sample, optimized mixing and the special shape of the reactor. Important parameters like induction time, mixing speed, etc have been determined and compared as functions of degree of supercooling and composition of PUFA mixtures. In accordance to theory, the induction times in both the cases decreased with increasing supercooling and mixer speed. On the other hand, the high linoleic fatty acid mixture required much higher supercooling (4.4K to 5.4K) than the high oleic mixture (2.2K to 3.2K) for favorable induction times.}, language = {en} }