Method and apparatus for collecting samples for analysis of chem

Details Method and apparatus for collecting samples for analysis of chem Method and apparatus for collecting samples for analysis of chem

1990-06-15

1991-08-13

Warden, Robert J.

Chemistry: analytical and immunological testing

Automated chemical analysis

436 47, 436174, 422 63, 422 64, G01N 3500

Patent

active

050396145

ABSTRACT:
An automated, on-line solvent elimination interface system is described for use in characterizing the Composition Distribution (CD) of unknown materials emerging from a fractionating unit or a process stream. Fractionated samples to be analyzed, such as a polymer, in highly diluted form in one or more solvents, are provided by a fractionation unit such as a gel permeation chromatograph (GPC), a high pressure liquid chromatograph (HPLC), or a field flow fractionator (FFF). A number of discharges of each particular fraction are supplied to individual collection units within the interface system under controlled conditions of flow rate, temperature and pressure (vacuum) such that the solvents are flash-evaporated at the collection unit. A sufficient solid residue is built up on the collection unit for analysis by, for example, a Fourier transform infrared (FTIR) analyzer.

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