Oxidative dehydration of glycerol to acrylic acid over vanadium-impregnated zeolite beta

Glycerol is the main byproduct of industrial biodiesel plants, and new technological routes using it as feedstock have been studied, due to the increase in world biofuel production. One of the possible applications is in the production of acrylic acid, a product with several industrial applications. This study analyzed a new process of converting crude glycerol, through purification for the removal of impurities, followed by oxidative dehydration reaction in a single step and purification until glacial acrylic acid specification standards are met. It was attested that the process is economically viable, with a payback period of 5 years for an NPV/Investment greater or equal to 2 and an IRR greater or equal to 10% per annum, or 4 years in case tax incentives offered for the development of green technologies.

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Soft ionic liquid based resistive memory characteristics in a two terminal discrete polydimethylsiloxane cylindrical microchannel

Journal of Materials Chemistry C ◽

10.1039/d0tc03334k ◽

2020 ◽

Vol 8 (38) ◽

pp. 13368-13374

Author(s):

Muhammad Umair Khan ◽

Gul Hassan ◽

Jinho Bae

Keyword(s):

Ionic Liquid ◽

Acrylic Acid ◽

Sodium Hydroxide ◽

Sodium Salt ◽

Resistive Memory ◽

Cylindrical Microchannel ◽

Memory Characteristics ◽

Poly Acrylic Acid

This paper proposes a novel soft ionic liquid (IL) electrically functional device that displays resistive memory characteristics using poly(acrylic acid) partial sodium salt (PAA-Na+:H2O) solution gel and sodium hydroxide (NaOH) in a thin polydimethylsiloxane (PDMS) cylindrical microchannel.

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The Role of the Initiator System in the Synthesis of Acidic Multifunctional Nanoparticles Designed for Molecular Imprinting of Proteins

Periodica Polytechnica Chemical Engineering ◽

10.3311/ppch.15414 ◽

2020 ◽

Vol 65 (1) ◽

pp. 28-41

Author(s):

Marwa Aly Ahmed ◽

Júlia Erdőssy ◽

Viola Horváth

Keyword(s):

Acrylic Acid ◽

Binding Affinity ◽

Molecular Imprinting ◽

Low Temperatures ◽

Ammonium Persulfate ◽

Sodium Bisulfite ◽

Multifunctional Nanoparticles ◽

High Affinity ◽

Initiator System

Multifunctional nanoparticles have been shown earlier to bind certain proteins with high affinity and the binding affinity could be enhanced by molecular imprinting of the target protein. In this work different initiator systems were used and compared during the synthesis of poly (N-isopropylacrylamide-co-acrylic acid-co-N-tert-butylacrylamide) nanoparticles with respect to their future applicability in molecular imprinting of lysozyme. The decomposition of ammonium persulfate initiator was initiated either thermally at 60 °C or by using redox activators, namely tetramethylethylenediamine or sodium bisulfite at low temperatures. Morphology differences in the resulting nanoparticles have been revealed using scanning electron microscopy and dynamic light scattering. During polymerization the conversion of each monomer was followed in time. Striking differences were demonstrated in the incorporation rate of acrylic acid between the tetramethylethylenediamine catalyzed initiation and the other systems. This led to a completely different nanoparticle microstructure the consequence of which was the distinctly lower lysozyme binding affinity. On the contrary, the use of sodium bisulfite activation resulted in similar nanoparticle structural homogeneity and protein binding affinity as the thermal initiation.

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