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Synthetic solutions of hydrolysed C.I. Reactive Orange 4, a monoazo textile dye commercially named Procion Orange MX-2R (PMX2R) and colour index number C.I. 18260, was exposed to electrochemical treatment under galvanostatic conditions and Na2SO4 as electrolyte. The influence of the electrochemical process as well as the applied current density was evaluated. Ti/SnO2-Sb-Pt and stainless steel electrodes were used as anode and cathode, respectively, and the intermediates generated on the cathode during electrochemical reduction were investigated. Aliquots of the solutions treated were analysed by UV-visible and FTIR-ATR spectroscopy confirming the presence of aromatic structures in solution when an electro-reduction was carried out. Electro-oxidation degraded both the azo group and aromatic structures. HPLC measures revealed that all processes followed pseudo-first order kinetics and decolourisation rates showed a considerable dependency on the applied current density. CV experiments and XPS analyses were carried out to study the behaviour of both PMX2R and intermediates and to analyse the state of the cathode after the electrochemical reduction, respectively. It was observed the presence of a main intermediate in solution after an electrochemical reduction whose chemical structure is similar to 2-amino-1,5-naphthalenedisulphonic acid. Moreover, the analysis of the cathode surface after electrochemical reduction reveals the presence of a coating layer with organic nature

roll crushers - sciencedirect

Polyimides, polyaramides, and polypyrrolones are among the polymers that are emerging or already in use (Baker et al., 1990; Zolandz and Fleming, 1992; Costello et al., 1994) and that could be used for the separation of acid gases from natural gas. Membranes made with polyvinylbenzyltrimethylammonium fluoride and polydiallyldimethylammonium fluoride have, uniquely, a high CO2/H2 selectivity (about 40 to 100) but low CO2 fluxes due to thick active layers (Laciak, 1994; Quinn et al., 1995). Thinner membranes appear to lose this selectivity. In general, more novel methods will have to be developed to produce very thin membranes for a high flux of the permeating acid gases

roll crushers - sciencedirect

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Roll crushers are arbitrarily divided into light and heavy duty crushers. The diameters of the light duty crushers vary between 228 and 760mm with face lengths between 250 and 460mm. The spring pressure for light duty rolls varies between 1.1 and 5.6kg/m. The heavy duty crusher diameters range between 900 and 1000mm with face length between 300 and 610mm. In general, the spring pressures of the heavy duty rolls range between 7 and 60kg/m. The light duty rolls are designed to operate at faster speeds compared to heavy duty rolls that are designed to operate at lower speeds

Synthetic solutions of hydrolysed C.I. Reactive Orange 4, a monoazo textile dye commercially named Procion Orange MX-2R (PMX2R) and colour index number C.I. 18260, was exposed to electrochemical treatment under galvanostatic conditions and Na2SO4 as electrolyte. The influence of the electrochemical process as well as the applied current density was evaluated. Ti/SnO2-Sb-Pt and stainless steel electrodes were used as anode and cathode, respectively, and the intermediates generated on the cathode during electrochemical reduction were investigated. Aliquots of the solutions treated were analysed by UV-visible and FTIR-ATR spectroscopy confirming the presence of aromatic structures in solution when an electro-reduction was carried out. Electro-oxidation degraded both the azo group and aromatic structures. HPLC measures revealed that all processes followed pseudo-first order kinetics and decolourisation rates showed a considerable dependency on the applied current density. CV experiments and XPS analyses were carried out to study the behaviour of both PMX2R and intermediates and to analyse the state of the cathode after the electrochemical reduction, respectively. It was observed the presence of a main intermediate in solution after an electrochemical reduction whose chemical structure is similar to 2-amino-1,5-naphthalenedisulphonic acid. Moreover, the analysis of the cathode surface after electrochemical reduction reveals the presence of a coating layer with organic nature

Polyimides, polyaramides, and polypyrrolones are among the polymers that are emerging or already in use (Baker et al., 1990; Zolandz and Fleming, 1992; Costello et al., 1994) and that could be used for the separation of acid gases from natural gas. Membranes made with polyvinylbenzyltrimethylammonium fluoride and polydiallyldimethylammonium fluoride have, uniquely, a high CO2/H2 selectivity (about 40 to 100) but low CO2 fluxes due to thick active layers (Laciak, 1994; Quinn et al., 1995). Thinner membranes appear to lose this selectivity. In general, more novel methods will have to be developed to produce very thin membranes for a high flux of the permeating acid gases

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