packed column वाक्य
उदाहरण वाक्य
मोबाइल
- This packing material can either be random dumped packing ( 1-3 " wide ) such as Raschig rings or " theoretical plates " to denote the separation efficiency of the packed column with respect to more traditional trays.
- Regular hexagons can occur when the cooling of lava forms areas of tightly packed columns of basalt, which may be seen at the Giant's Causeway in Northern Ireland, or at the Devil's Postpile in California.
- It is not used at an industrial scale, because it is has low surface area and liquid hold-up compared to other gas-liquid contactors ( e . g . a packed column or a plate column ).
- The stationary phase is adhered to the inside of a small-diameter ( commonly 0.53 0.18mm inside diameter ) glass or fused-silica tube ( a capillary column ) or a solid matrix inside a larger metal tube ( a packed column ).
- In particular heat and mass transfer velocity is higher for equipment with higher values of gas liquid interface surface area, so gas liquid contactors with high surface area ( e . g . packed column, spray tower ) are often preferred when it is important to lower the cost of the equipment.
- A low pH will lead to high levels of dissolved carbon dioxide ( CO 2 ), which can prove toxic to fish . pH can also be controlled by degassing CO 2 in a packed column or with an aerator, this is necessary in intensive systems especially where oxygenation instead of aeration is used in tanks to maintain O 2 levels.
- In liquid chromatography, the mobile phase velocity is taken as the exit velocity, that is, the ratio of the flow rate in ml / second to the cross-sectional area of the column-exit flow path . For a packed column, the cross-sectional area of the column exit flow path is usually taken as 0.6 times the cross-sectional area of the column.
- In a typical experiment, a packed column is used to separate the light gases, which are then detected with a FID . A complication with light gas analyses that include H 2 is that He, which is the most common and most sensitive inert carrier ( sensitivity is proportional to molecular mass ) has an almost identical thermal conductivity to hydrogen ( it is the difference in thermal conductivity between two separate filaments in a Wheatstone Bridge type arrangement that shows when a component has been eluted ).
- Metal packing types can extend to wire packings of nichrome and inconel ( akin to Podbielniak columns ), to stainless steel gauze ( Dixon rings ), and indeed to any of the various special packing methods used in distillation ( e . g ., Stedman packing methods ); for instance, wire-packed columns of the Podbielniak type function by providing large surface areas for vapor-liquid interaction with capillary-like spaces that very evenly spread the condensed liquid, such that " channeling and flooding " in the column " are minimized ", and giving, in one specific example, added theoretical plate counts of 1-2 per 5 cm of packed length.
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