Applications with keyword: Purification
Accelerated video showing the removal of methylene blue from 50 L volume of liquid, by adsorption onto activated carbon in a production scale rotating bed reactor (RBR). The decolouration process removed 99.96% of the dye within 10 minutes with a logarithmic decline of concentration as documented by analysis of withdrawn samples.
Conditions: Adsorption of methylene blue (20 g, 400 mg/L) onto activated carbon (7 L, 20-50 mesh) placed in a SpinChem® S511 rotating bed reactor (RBR) operated at 200 rpm within a 38 cm diameter cylindrical reaction vessel containing 50 L water and equipped with three baffles placed along the edges. Samples were withdrawn every half minute and analysed by light adsorption without any need for filtration. The video is shown at 20x speed.
Comparison of rotating bed reactor (RBR) technology and fixed bed reactor (FBR) column during activated carbon decolourization. The more efficient use of the adsorbent with a SpinChem® RBR enabled completion of the process within 40% of the time at the same material amount or allowed reduction to 50% material while still being able to finish the process within the same time as the FBR.
Photos showing how grinding caused by stirring of molecular sieves can be completely avoided by using a rotating bed reactor (RBR). Molecular sieves contained in a RBR for a 200 mL vessel can theoretically hold 0.23 moles of water. This allows synthesis of product in the range of 100 gram by ester condensation or drying of 25 litres of analytical grade organic solvent.
Conditions: Molecular sieve (3 Å, rods 3-5 mm, 15 g), placed either into a SpinChem® S221 rotating bed reactor (RBR) or free in solution agitated by a 3-blade stainless steel propeller (5 cm), both operated at 500 rpm within a SpinChem® V211 flower-baffled reaction vessel containing isopropanol (130 mL). Photos were taken after 24 hours of operation with the RBR and stirrer in place, respectively. The theoretical calculation assumed an RBR with space for 20 g molecular sieve with a 20% (w/w) water adsorption capacity, a synthesis yield of 99%, a product weight of 450 g/mol, and an organic solvent with a density of 0.8 kg/L and an initial moisture content of 200 ppm; data partly taken from literature; J. Org. Chem. 2010 (75) 8351-8354.