摘要:
Process and apparatus for producing plastic membrane tubing of a selected length, wall thickness and inner diameter from a commercially-available tubing while retaining tubing end portions which are readily connected by conventional tubing connections to the tubing leads for an associated analytical apparatus, involving a controlled heating and a rapid stretching of the heated tubing by fixing a first end of the tubing and application of a constant tensile force to a second end of the tubing to stretch the tubing a desired amount.
摘要:
A spectroscopic detector cell which is particularly suited to the analysis of low flowrate and small volume liquid samples in micro-flow injection analysis or titration and microbore, high pressure liquid chromatography, wherein interference from bubbles in the flow path of the light passing through the cell is substantially eliminated by using a serpentine coil of small-bore, transparent(to the light employed for a given analysis), overlapping tubing for carrying the liquid to be analyzed at a high enough velocity to sweep away any otherwise interfering bubbles that might be formed in the liquid, and by immersing the coil in a second fluid (a gas or a liquid) which possesses the same refractive index as the tubing material and which also is transparent to the light employed for a given analysis.
摘要:
A membrane-based fluid separations apparatus, comprising an outer vessel or outer vessel assembly having an opening defined therein, a probe member inserted through and secured in the opening and having a groove defined therein, and a tubular membrane supported in the groove in the probe member and defining first and second ends which can be placed in fluid communication with a source of a fluid from which a species is to be selectively removed and a desired destination for fluid from said membrane, respectively.
摘要:
An apparatus for use in determining the presence and/or concentration of one or more selected materials in a matrix stream of materials within a process pipe, reactor or other process vessel, including (a) a support member having a first, internal end for inserting into the matrix stream when the apparatus is placed in service and a second end positioned externally of the pipe, reactor or other vessel in use, wherein the support member defines a groove therein of which at least a portion extends into the matrix stream in use, and (b) a conduit, for example a capillary membrane, positioned and supported substantially wholly within at least that portion of the groove in the support member which extends into the matrix stream in use.
摘要:
An apparatus for use in determining the presence and/or concentration of one or more selected materials in a given stream or aggregation in a conduit or vessel, the apparatus comprising (a) a support member constructed from a thermally conductive material and having a first, internal end for inserting into the stream or aggregation when the apparatus is placed in service and a second end positioned externally of the conduit or vessel in use, wherein the support member defines a groove therein of which at least a portion extends into the stream or aggregation in use, (b) a conduit positioned and supported substantially wholly within at least that portion of the groove in the support member which extends into the stream or aggregation in use, and (c) a temperature monitoring device positioned within the support member, whereby the temperature of the conduit/stream or aggregation interface may be measured by thermal conduction from the supporting groove portion of the support member to the temperature monitoring device contained within the support member.
摘要:
A device for the separation of small particles or cells from a fluid suspension of the same is described. The device includes a coaxial tubular design in which the inner tube is a micro porous tube that allows the passage of liquids and certain particulates up to a certain size cut-off, and the outer tube allows for the collection of passed fluids. Inlet and outlet ports allow the introduction and flushing of components of interest. Embodiments of the device can be used for the separation of blood components, the sequestering of micro spheres used in micro-sphere-based immuno assay, and sample filtration. Other applications are not precluded. Another field of application for this device is in the separation of plasma from red blood cells. The red blood cells will not pass through the membrane due to their size, but plasma will.
摘要:
Apparatus and method for sequential injection liquid-liquid extraction analysis. Under the control of a bidirectional precision pump, a stream-selection valve, and a microprocessor, a series of liquid zones is built up in a holding/mixing coil. The liquid zones are transferred from the holding/mixing coil to a separation cell. After phase separation into an extract and a raffinate, the extract is withdrawn from the separation cell and sent to a detector, which determines the amount of a component which was extracted from a sample by an extraction solvent. The principal advantages of this automated technology are elimination of the need for dynamic phase separation; on-line pre-extraction chemical conditioning; a substantial reduction in solvent, reagent, and sample usage; and a similar substantial reduction in waste generation.
摘要:
An in-line filter probe for process analysis. The probe, which has a U-shaped porous tube mounted on a support and sealed at the tube's midsection, is placed in a process stream to provide filtered samples of the stream.
摘要:
A method for electrolytically pretreating a cation exchange membrane by partitioning a first aqueous electrolyte solution from a second aqueous electrolyte solution with the membrane and then passing an electrical current through the system so that the cations of the first solution electro-migrate through the membrane into the second solution. The cation composition of the first solution being more than 99.99% of hydrogen ion and a single cation moiety selected from the group consisting of alkali metal cations and alkaline earth cations, the cation composition of the second solution consisting essentially of the same cation composition as the first solution. The result is a membrane that is almost completely equilibrated with the cations of the first solution. The pretreated membrane is especially suitable for use in the sensor for chemical analysis described in U.S. Pat. No. 4,333,810.
摘要:
An analytical system for solutions containing soluble solids or high concentrations of dissolved solids. The system includes a container having upper and lower portions; a lead an/or a tubing line extending into the upper portion of the container, for withdrawing a portion of a gas in the upper portion of the container; and a sampling probe extending into the lower portion of the container, for withdrawing a portion of a sample of a liquid or of a mixture of a liquid and a solid. The sampling probe is a probe support shaft which may be provided with a filter for separating liquid and solid phases from one another if the sample is a liquid-solid mixture. Gas in the headspace above the liquid or the liquid-solid mixture can be withdrawn through the lead and/or the tubing line.