Search results for "Turing"

Holzkohle kann als erstes synthetisches Material der Menschheit angesehen werden. Holz- und Knochenkohle sowie oberflachenaktive Erden wurden schon in vorgeschichtlichen Technologien vielfaltig benutzt. Die systematische Erforschung poroser Adsorbentien beginnt 1773 mit Scheele, Priestley und Fontana. Zu Anfang des 19. Jahrhunderts war die Zuckerraffinerie die erste industrielle Nutzung, Ende des 19. Jahrhunderts wurde die grosindustrielle Fabrikation poroser Materialien aufgenommen und mit der Wende zum 20. Jahrhundert wurden viele neuartige porose Materialien synthetisiert und erforscht.

General Chemical EngineeringGeneral ChemistryIndustrial and Manufacturing EngineeringChemie Ingenieur Technik

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INFLUENCE OF THE EXPERIMENTAL SYSTEM AND OPTIMIZATION OF THE SELECTIVITY FOR THE ELECTROCARBOXYLATION OF CHLOROACETONITRILE TO CYANOACETIC ACID

2004

The electrocarboxylation of chloroacetonitrile (ClACN) to cyanoacetic acid in undivided cells equipped with sacrificial anodes was investigated both in a bench-scale electrochemical batch reactor and in a continuous batch recirculation reaction system equipped with a parallel-plate electrochemical cell. Selectivity and faradaic yields higher than 90% were obtained by working under anhydrous conditions with low halide concentrations and at more negative potentials. It was found that the instantaneous selectivity in the carboxylate compound depends mainly on the [CO 2 ]/[ClACN] ratio at high substrate concentration and is close to 100% for low ClACN concentration. These results were consisten…

General Chemical EngineeringInorganic chemistryBatch reactorSubstrate (chemistry)General ChemistrySettore ING-IND/27 - Chimica Industriale E TecnologicaElectrochemistryIndustrial and Manufacturing EngineeringElectrochemical cellchemistry.chemical_compoundcarboxylation father-son reactionCyanoacetic acidchemistryCarboxylationOrganic chemistryCarboxylateSelectivity

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Understanding the separation of anion mixtures by TiO2 membranes: Numerical investigation and effect of alkaline treatment on physicochemical propert…

2019

Abstract Mechanisms governing the rejection of ions from multi-ionic solutions, and especially the selectivity between various anions are not fully understood at the present time. In this study, it is proposed, in a first part, to investigate the evolution of electric and dielectric exclusion mechanisms when anions are mixed in a solution. For this purpose, the volumetric membrane charge Xd and the dielectric constant of the solution confined within pores ep are numerically assessed from rejection curves with a classic transport model. This study highlights that the rejection of the various anions is differently governed by electric and dielectric mechanisms but their contribution to mixtur…

General Chemical EngineeringInorganic chemistrySalt (chemistry)02 engineering and technologyDielectric010402 general chemistry01 natural sciencesIndustrial and Manufacturing Engineeringlaw.inventionIonchemistry.chemical_compoundlawEnvironmental Chemistry[CHIM]Chemical SciencesFiltrationComputingMilieux_MISCELLANEOUSchemistry.chemical_classificationGeneral Chemistry021001 nanoscience & nanotechnology0104 chemical sciencesMembranechemistry0210 nano-technologySodium carbonateTernary operationFluoride

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