Process for controlling concentration of a solution of a solvent and polymer
First Claim
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1. A process for measuring and controlling the concentration of a solution at an aim point of an amide solvent and aramid polymers having aromatic and aliphatic carbon-hydrogen bonds that overlap using a near-infrared analyzer, said process comprising the steps of:
- a) obtaining averaged absorbance spectra of the solution for the wavelengths where the contributions to the spectrum by aromatic and aliphatic carbon-hydrogen bonds overlap;
b) making a baseline correction to the spectra;
c) determining area-based contributions, A1, to the spectra from aromatic carbon-hydrogen bonds;
d) determining area-based contributions, A2, to the spectra from aliphatic carbon-hydrogen bonds;
e) computing a ratio (A1-C2)/(A2-C3) by utilizing a ratio-based algorithm with the area-based contributions of the aromatic and aliphatic carbon-hydrogen bonds as inputs wherein C2 and C3 are constants;
f) scaling the ratio, (A1-C2)/(A2-C3) from step e) using known polymer concentrations and multiple linear regression to provide a corrected slope and intercept so that the percent of aromatic polymer solids dissolved in the solvent is determined; and
g) adjusting the amount of solvent by removing excess solvent from the solution in accordance with percent aromatic polymer solids dissolved in the solution as determined in step f).
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Abstract
A process for measuring and controlling the concentration of a solution at an aim point of an amide solvent and aramid polymers having aromatic and aliphatic carbon-hydrogen bonds that overlap using a near-infrared analyzer.
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Citations
4 Claims
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1. A process for measuring and controlling the concentration of a solution at an aim point of an amide solvent and aramid polymers having aromatic and aliphatic carbon-hydrogen bonds that overlap using a near-infrared analyzer, said process comprising the steps of:
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a) obtaining averaged absorbance spectra of the solution for the wavelengths where the contributions to the spectrum by aromatic and aliphatic carbon-hydrogen bonds overlap; b) making a baseline correction to the spectra; c) determining area-based contributions, A1, to the spectra from aromatic carbon-hydrogen bonds; d) determining area-based contributions, A2, to the spectra from aliphatic carbon-hydrogen bonds; e) computing a ratio (A1-C2)/(A2-C3) by utilizing a ratio-based algorithm with the area-based contributions of the aromatic and aliphatic carbon-hydrogen bonds as inputs wherein C2 and C3 are constants; f) scaling the ratio, (A1-C2)/(A2-C3) from step e) using known polymer concentrations and multiple linear regression to provide a corrected slope and intercept so that the percent of aromatic polymer solids dissolved in the solvent is determined; and g) adjusting the amount of solvent by removing excess solvent from the solution in accordance with percent aromatic polymer solids dissolved in the solution as determined in step f). - View Dependent Claims (2, 3, 4)
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