Wyniki wyszukiwania - BazTech

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Hydrous Methanol Fuelled HCCI Engine Using Ignition Improver CAI Method - ANN Approach

Venkatesan M., Moorthi N. S. V., Franco P. A., Manivannan A., Karthikeyan R.

Mechanics and Mechanical Engineering

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2015

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Vol. 19, nr 1

31--49

EN

The present study is to examine the performance and emission characteristics of a Homogeneous Charge Compression Ignition (HCCI) engine where hydrous methanol (85% methanol and 15% water) is used as primary fuel and Diethyl ether (DEE) as an ignition improver. A modified diesel engine has been used as a HCCI engine. By measuring the excess air ratio (λDEE), the quantity of DEE flow rate is measured and excess air ratio (fiDEE) is varied from fiDEE5.6 to fiDEE 9.5. Experimental results reveal that HCCI engine gives better brake thermal efficiency (BTE) at high loads (λDEE 9.5). It shows decrease in oxides of nitrogen (NOx) emission, slightly high emission of carbon monoxide (CO) and unburned hydrocarbon (HC) compared to conventional compression ignition (CI) engine. Radial basis function neural network (RBFN) model has been developed with brake power, excess air ratio and energy share as input and BTE, CO, HC, NOx, rate of pressure rise as output. About 80% of total experimental data is used for training purposes, and 20% is used for testing. The performance of the developed RBFN model were compared with experimental data, and were statistically evaluated which was found to be in good agreement.

2

Reactive distillation for multiple-reaction systems: optimisation study using an evolutionary algorithm

Keller T., Dreisewerd B., Górak A.

Chemical and Process Engineering

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2013

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Vol. 34, nr 1

17--38

EN

Reactive distillation (RD) has already demonstrated its potential to significantly increase reactant conversion and the purity of the target product. Our work focuses on the application of RD to reaction systems that feature more than one main reaction. In such multiple-reaction systems, the application of RD would enhance not only the reactant conversion but also the selectivity of the target product. The potential of RD to improve the product selectivity of multiple reaction systems has not yet been fully exploited because of a shortage of available comprehensive experimental and theoretical studies. In the present article, we want to theoretically identify the full potential of RD technology in multiple-reaction systems by performing a detailed optimisation study. An evolutionary algorithm was applied and the obtained results were compared with those of a conventional stirred tank reactor to quantify the potential of RD to improve the target product selectivity of multiple-reaction systems. The consecutive transesterification of dimethyl carbonate with ethanol to form ethyl methyl carbonate and diethyl carbonate was used as a case study.

3

Enancjoselektywne utlenianie chiralnego hydroksyfenylometanofosfonianu dietylu za pomocą drożdży piekarniczych

Pawlak D., Żymańczyk-Duda E.

Przemysł Chemiczny

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2012

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T. 91, nr 2

199-201

PL

Przedstawiono wyniki badania reakcji utleniania mieszaniny racemicznej 1-hydroksy-1- fenylometanofosfonianu dietylu, katalizowanej przez prasowane drożdże piekarnicze opcjonalnie w obecności cykloheksanonu jako czynnika regenerującego kofaktory dehydrogenaz zaangażowanych w proces biokatalizy.

EN

Racemic mixt. of PhCH(OH)P(O)(OEt)₂ was enantioselectively oxidized at 18–25°C for 120 h by using baker’s yeast as a biocatalyst optionally in presence of cyclohexanone. The product showed an enantiomeric excess up to 39% as calcd. from 31P-NMR spectra.