The effect of the polydispersity polystyrenes on dispersion through silicas having different morphologies (fully porous, core-shell particles and monoliths) was investigated. heights equivalent to a theoretical plate (HETP) those columns were measured for small molecule (toluene) series sizes in non-adsorbing conditions. contributions total HETP including determined experimentally. longitudinal...

Brass Ferrules have been used as packing in a laboratory- scale glass distillation column approaching pilot plant size because of their availability in all sizes and low cost. The available size range is such that these ferrules could also be used in industry and the results of this study could be scaled up. The performance of the new packing has been compared with the performance of glass ...

brass ferrules have been used as packing in a laboratory- scale glass distillation column approaching pilot plant size because of their availability in all sizes and low cost. the available size range is such that these ferrules could also be used in industry and the results of this study could be scaled up. the performance of the new packing has been compared with the performance of glass pack...

In response to a lack of environmental combined nitrogen, the filamentous cyanobacterium Anabaena sp. strain PCC 7120 differentiates nitrogen-fixing heterocyst cells in a periodic pattern. HetR is a transcription factor that coordinates the regulation of this developmental program. An inverted repeat-containing sequence in the hepA promoter required for proheterocyst-specific transcription was ...

Transposon-generated mutant C3 of Anabaena sp. strain PCC 7120 is unable to form heterocysts upon deprivation of combined nitrogen but forms a pattern of spaced, weakly fluorescent cells after 2 days of deprivation. Sequence analysis of chromosomal DNA adjacent to the ends of transposon Tn5-1058 in mutant C3 showed a 1,044-amino-acid open reading frame, designated hetC, whose predicted protein ...

Large-pore materials or supports resembling polymer conduits are used as packing material in chromatographic operations. Our ongoing research has shown that, when modified with peptides or ligands, chitosan beads that are 800 microm in diameter and have 3.5% solids can be used as matrices in bioseparations. The goal of the present study is to evaluate the transport properties of biomolecules in...

Packed columns are equipment commonly found in absorption, distillation, stripping, heat exchangers and other operations, like removal of dust, mist and odors and for other purposes. Mass transfer between phases is promoted by their intimate contact through all the extent of the packed bed. The main factors involving the design of packed columns are mechanics and equipment efficiency. Among the...

Common mass transfer models for multistage distillation show significant deviations between calculated and experimental height equivalent to a theoretical plate (HETP) values viscous feed mixtures. This is due limited transferability of the available data which were mainly obtained from experiments with inviscid Separation efficiency measurements at elevated viscosities can be conducted polymer...

This paper presents accurate models evaluating the hydrodynamic and separation behavior of an innovative packing structure called Tetra Spline (TS) packing. The newly designed internal is a wire-based lattice fabricated via additive manufacturing for gas-liquid contact systems, such as distillation absorption columns. Using dimensional analysis, four correlations are developed prediction dry we...