Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Sampler – constituent separation – sample handling – or sample...
Reexamination Certificate
1999-12-07
2001-05-01
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Sampler, constituent separation, sample handling, or sample...
C073S061560, C073S864810, C073S864210, C073S863030
Reexamination Certificate
active
06223590
ABSTRACT:
BACKGROUND OF THE INVENTION
There is a continuing need to analyze containers of volatile mixtures, such as mixtures of fluorocarbon liquids and other lower boiling organic gas mixtures. The concentration of the components in the vapor space above such liquids does not always correspond to the concentration in the liquid state due to several reasons. One factor is due to Raoults Law which states that the vapor concentration of a component depends upon the molefraction of that component in the liquid states. A second factor is that the vapor represents a distillation of the components in the liquid state, and many times the distillation will represent an azeotropic distillation in which the concentration of components in the liquid will control the concentration in the vapor state. It is also true that layering can occur of components in the vapor state due to differing densities in the several gases.
Another method of achieving a gas whose composition is equal to that of the liquid in a container of volatile liquids is the evaporation of a quantity of the material which requires heat and gives a gas of uncertain pressure values, is more difficult to carry out in a precise fashion and obtain correct analytical results, nor does such a method remove the oil which will be present in a quantitative fashion.
The invention described below precludes these sorts of complexities and gives every time an analysis of the liquid state which is not skewed by any known factors on a gas at a known pressure.
SUMMARY OF THE INVENTION
The device of this invention is comprised of a number of components connected in series, the purpose being to transform a liquid sample under pressure in the liquid container into an oil and particulate-free gas sample at a predetermined known pressure. The components are sequentially:
1. a coupler which attaches to the liquid part of the container;
2. a 20-50 micron sintered filter which removes relatively large inert particles;
3. a first orifice or pressure regulator which governs the free expansion of the liquid to a gas of identical composition. At the same time the gas is generated from the liquid sample, the oils usually present in such containers are converted into non-volatile droplets. The driving force in this evaporation is the pressure in the initial liquid container;
4. immediately following the gas expansion first orifice or pressure regulator there is a pressure negative shut off which will yield a steady flow of the gas to be analyzed through the gas cell contained in the IR filter spectrometer where the analysis is carried out;
5. in the next stage of the device there is a disposable coalescing filter which removes the oil droplets from the gas stream. Herein contained in the filter is an oil saturation color detector which is a dye. The development of an indicator color indicates the filter has exhausted its capacity and should be replaced. A view-port is present in this section of the device to make for ease of determination of the filter status; and
6. the final section is a fitting which is utilized to attach the volatilization device to the IR filter spectrometer employed for the analysis of the gas.
The device can be cleansed of all gases and be at ready to perform the next analysis by passing clean air through the device.
REFERENCES:
patent: 3103807 (1963-09-01), Broerman
patent: 4644807 (1987-02-01), Mar
patent: 4999164 (1991-03-01), Puchinger
patent: 5044166 (1991-09-01), Wijmans et al.
patent: 5163979 (1992-11-01), Patrick et al.
patent: 5297433 (1994-03-01), Elgas
patent: 5469714 (1995-11-01), Manz et al.
patent: 5525303 (1996-06-01), Ford et al.
patent: 5611846 (1997-03-01), Overton et al.
O'Dwyer Barry
Prozzo Christopher D.
Cygan Michael
Janos Technology Inc.
Williams Hezron
Wolfson Herbert M.
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