Abstract:
It can sometimes be difficult to quantify the amount of polymer present in a subterranean treatment fluid, particularly at a job site. Methods for analyzing a treatment fluid for a polymer can comprise: receiving a sample of a treatment fluid comprising a nitrogen-containing polymer; placing the sample of the treatment fluid and an aqueous base in an oilfield retort; heating the sample of the treatment fluid and the aqueous base together in the oilfield retort at least until the nitrogen-containing polymer has been substantially hydrolyzed to one or more volatile nitrogen compounds; distilling the one or more volatile nitrogen compounds from the oilfield retort; and determining a quantity of the nitrogen-containing polymer in the sample of the treatment fluid based upon a quantity of the one or more volatile nitrogen compounds distilled from the oilfield retort. Analyses of other nitrogen-containing compounds may take place similarly.
Abstract:
At least one embodiment of the inventive technology may be described as a method for analyzing a hydrocarbon that comprises volatiles, said method comprising the steps of: segregating said volatiles from said hydrocarbon without oxidizing said hydrocarbon; generating a hydrocarbon residue and segregated hydrocarbon volatiles; and analyzing at least one of said hydrocarbon residue and said segregated hydrocarbon volatiles. The advantageous avoidance of oxidation may be achieved by placing the hydrocarbon under a vacuum, which may also enable the avoidance of cracking of the hydrocarbon while still achieving segregation of volatiles as desired. One other of the several embodiments disclosed and claimed herein may focus more on vacuum transfer and vacuum distillation of hydrocarbon volatiles. These and other methods disclosed herein may be used to achieve improved hydrocarbon analysis results.
Abstract:
Systems, methods and apparatus implementing techniques for separating and/or analyzing fluid mixtures. The techniques employ microfluidic separation devices that include an inlet port for receiving a fluid feed stream, a microscale fluid flow channel in fluid communication with the fluid inlet port, a phase equilibrium control region located along the fluid flow channel for controlling conditions including temperature and/or pressure to provide a thermal equilibrium, a capillary network in the temperature control region, a first outlet port in indirect fluid communication with the fluid flow channel through the capillary network, and a second outlet port in direct fluid communication with the fluid flow channel. A plurality of microfluidic separation devices can be coupled in fluidic communication to provide for separation of complex mixtures. The systems, methods and apparatus can be used to characterize fluid mixtures.
Abstract:
A method of analyzing cell wall components based on a hot dilute acid extraction, followed by alcohol precipitation, of plant cellulosic materials such as cotton fibers or wood pulp. The extracts are analyzed by high pH anion exchange chromatography to separate and characterize the carbohydrates. This method extracts a characteristic series of carbohydrate multimers containing galactose, mannose and glucose. The pattern of multimers is indicative of origin of the cellulosic material ( e.g. , the plant species the material comes from) as well as quality and processing state of the material. The alcohol precipitation improves the discriminating powers of the analysis so that the species of origin of plant products can be identified.
Abstract:
To avoid deposits on the restrictor that channels extractant into a collector (1901), a heated capillary tube (1900) pressure release restrictor has a thermally insulated outlet end in a collecting trap (1908) substantially colder than the capillary tube (1900). The restrictor is heated between the insulation (1906) and the capillary tube (1908) by Joulean heating. The solvent in the trap (1908) is at a pressure of 5 to 200 psi above atmospheric pressure. The thermal resistance of the insulation (1906) is selected to reduce the heat added to the extractant to a minimum, to keep the extractant from freezing, and to reduce partitioning of the extract and extractant. It has a thermal conductivity no greater than 60 BTU's per hour, per square foot, per inch for a one degree Fahrenheit difference.
Abstract:
본 발명은 방사성탄소 연대측정용 시료전처리를 위한 전자동 환원장치에 관한 것으로, 더욱 상세하게는 이산화탄소포집기의 액체질소용기에 공급되는 액체질소의 비산에 의해 액체질소용기의 주변 장치가 냉각되는 것을 방지하고, 환원반응기의 반응로 가열 시 반응로의 열기를 통해 주변 장치가 가열되는 것을 방지한 방사성탄소 연대측정용 시료전처리를 위한 전자동 환원장치에 관한 것이다.
Abstract:
A method is provided of obtaining a vapour phase spectrum of a compound. The method comprises providing an isolated condensed phase sample of the compound (20), vaporising the sample and supplying the vapour to an absorption cell of a spectrometer (22). A rate at which vapour enters the absorption cell is determined (24) and a steady state concentration of vapour in the absorption cell is established (26). The spectrum of the vapour is then measured (28).
Abstract:
A micro-analyzer is described. This micro-analyzer includes an outer surface region on a sampler surface that receives liquid droplets, and aggregates and moves the droplets radially toward an inner surface region on the sampler surface that receives the droplets. For example, the outer surface region may include a set of micro-patterned concentric rings, each of which includes a set of radially oriented wall-groove pairs. Moreover, the sampler surface may be increasingly less hydrophobic along a radial direction toward the center of the sampler surface, thereby creating an axisymmetric wettability gradient. After the droplets are aggregated, an analysis mechanism in an area within the inner surface region performs analysis on the aggregated droplets.
Abstract:
Gasanalyseeinrichtung zur Qualitätsüberwachung eines gasförmigen Stoffes oder Stoffgemisches, insbesondere Luft, mit einer Probennahmeeinheit (2) zur dosierten Entnahme einer Probe 17 des gasförmigen Stoffes oder Stoffgemisches aus der Umgebung, welcher eine Messeinheit (3) zur Analyse der Probe nachgeschaltet ist, wobei die in einem geschlossenen Behälter (1) untergebrachte Probennahmeeinheit (2) sowie Messeinheit (3) zumindest teilweise gemeinsam innerhalb eines vom gasförmigen Stoff oder Stoffgemisch durchströmten Kanals (4) in Reihe angeordnet sind, der ausgehend von der Probennahmeeinheit (2) eine in flüssigem Lösungsmittel gelöste Probe (17) des gasförmigen Stoffes oder Stoffgemisches durch den Kanal (4) hindurch zur Messeineinheit (3) leitet, und der weiterhin Mittel zur Erzeugung mindestens eines künstlichen Kraftfeldes umfasst, welche die Positionierung und den Transport der Probe (17) zwischen der Probennahmeeinheit (2) und der Messeinheit (3) im Kanal (4) für die Durchführung der Gasanalyse realisieren.