Ng Tran

Development of Ni-Mo, Ni-W and Ni-Co Macroporous Materials for Hydrogen Evolution Reaction

This work was supported by Generalitat Valenciana (Project PROMETEO/2010/023) and Universitat Politecnica de Valencia (PAID-06-10-2227). I. Herraiz-Cardona is grateful to Fundacion Iberdrola for the financial support.

Process Modification Potentials for Total Site Heat Integration

The technique to identify the scope for process modifications to improve energy efficiency of individual processes using the Composite Curves was developed many years ago. The potential of improving Total Site Heat Integration (TSHI) via process modification based on the Plus-Minus Principles of Pinch Analysis has been analysed in this work. An approach to target process modifications to maximise energy saving via TSHI has been proposed. The approach consists of two steps: in the first step, the options for reducing utility targets are identified by the use of Total Site Profiles (TSP) and Site Composite Curves (SCC); the second step is to link the identified changes on the TSP/SCC to the specific changes required at the individual processes. The study has shown that the Plus-Minus Principles can be applied on a TS context. By targeting the process modifications at the selected process sections, an improvement in heat recovery can be achieved.

Fast Turbulent Flames in Duct -vented Gas Explosion

The influence of vent ducts on gas explosions was investigated with the aim of determining whether the use of larger area of the vent duct than the vent, would reduce the overpressure in vented duct explosion. A 0.2 m 3 cylindrical vessel was used with L/D (length to diameter) of 2, at the limit of applicability of current explosion venting design guidance. Only end ignition was considered in this study with a vent coefficient, K of 16.4. Methane/air mixtures over a range of equivalence ratio, Ф (0.68, 0.84 and 1.05) have been used. Results showed that while there is no significant difference in maximum pressure for larger vent duct as compared to a free discharge vent at lean mixtures, however, a significant increase of overpressure ∼ 1.4 bar was obtained in reactive mixtures i.e. Ф = 1.05. This was due to the high unburnt gas velocities induced in the vent duct by the most reactive explosion, creating very high turbulence levels at the vent duct inlet which gave rise to very fast flames and very high back pressures. Flame speeds in the vent duct of up to 500 m/s were measured for the most reactive mixture in the larger vent duct. The results were not predicted by the current US and European vent design guidance.

Quality Control Of Poly(methyl Methacrylate) To Medical Purpose By Multiple Headspace Extraction

Quality Control of Poly(Methyl Methacrylate) to Medical Purpose by Multiple Headspace Extraction Lamia Zuniga Linan,* Anderson Bonon, Nadson M. N. Lima, Rubens Maciel Filho, Flavio Manenti a Instituto de Biofabricacao (BIOFABRIS), School of Chemical Engineering. State University of Campinas, UNICAMP, Campinas-SP, Brazil. b Politecnico di Milano, CMIC Dept. “Giulio Natta”, Piazza Leonardo da Vinci 32, 20133 Milano, Italy. lazuli@feq.unicamp.br

Photocatalytic Synthesis of Acetaldehyde by Selective Oxidation of Ethanol on RuOx-VOx/TiO2

The gas-solid photocatalytic partial oxidation of ethanol to acetaldehyde on monometallic RuOx/TiO2 and bimetallic RuOx-VOx/TiO2 catalysts has been studied in a fluidized bed photoreactor at high illumination efficiency. For RuOx/TiO2, by increasing ruthenium loading ethanol conversion decreased from 60 to 37 %, while acetaldehyde selectivity increased to about 97 % at 0.4 wt % RuO2 loading. With bimetallic RuOxVOx/TiO2 the selective yield to acetaldehyde by monometallic Ru based catalysts is enhanced by the highly active V species, resulting in higher photocatalytic performance. By increasing the vanadium loading, ethanol conversion increased up to 100 % with almost total selectivity to acetaldehyde.

Energy Saving Strategies in Green Data Center Designing Based on Aerosol Corrosion Prevention

Data centers (DC) are responsible for a large global electricity usage mainly due to their cooling systems. Air conditioning (AC) costs could be reduced using a Direct Free Cooling (DFC) system which uses outside air to directly cool the information technology (IT). However this approach involves the risk to introduce outdoor aerosol which can become electrically conductive if the surrounding air reaches the aerosol Deliquescence Relative Humidity (DRH), thus damaging electronic equipment. In this work we present a study aimed to increase DC energy efficiency, whilst at the same time preventing aerosol corrosion. The study was conducted in Italy at Sannazzaro de’ Burgondi (SdB, Po Valley), to specifically optimize the operating conditions of a DC designed for the Italian National Hydrocarbon Institution (ENI) (5,200 m 2 of IT installed, 30 MW). Aerosol number size distribution was monitored and allowed to estimate the aerosol level entering the DC; moreover aerosol chemical composition was investigated and allowed to estimate the aerosol free acidity and the aerosol DRH using the thermodynamic Aerosol Inorganic Model (E-AIM). E-AIM output were validated through laboratory tests, using an Aerosol Exposure Chamber, and through a comparison among “wet” and “dry” aerosol size distribution measured at SdB. From these data it was possible to design the filtering system of the DC and to estimate the outdoor air supply time, by DFC, and thus to estimate the energy consumption of the DC. A potential energy savings of 60% was estimated compared to a traditional AC cooling system with a potential energy saving of 7358 kWh and 2.67 t of CO2 (for 1 kW of installed IT).