Chemistry: physical processes – Physical processes – Crystallization
Patent
1980-06-18
1981-09-22
Adee, John
Chemistry: physical processes
Physical processes
Crystallization
210635, 210659, B01D 1508
Patent
active
042907764
ABSTRACT:
Provided is a process for analyzing acidic substances by high speed liquid chromatography. An aqueous pH indicator solution is incorporated in an effluent from a column packed with a packing material, and the pH indicator-incorporated effluent is monitored by means of spectrophotometry. As the pH indicator, a sulphon phthalein indicator is used, which is at least slightly soluble in water and has a pH transformation range falling within the pH range of from about 3.0 to about 10.0 and which exhibits, when maintained at a pH lower than the pH transformation range, the minimum transmittance at a wave length of about 420-440 nm and, when maintained at a pH higher than the pH transformation range, the minimum transmittance at a wave length of at least about 558 nm. The packing material is preferably a sulfonated styrene/divinylbenzene copolymer having a total exchange capacity of about 4 to 5 milli-equivalent/gram.
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patent: 3892530 (1975-01-01), Felix
patent: 3997298 (1976-12-01), McLafferty
patent: 4039284 (1977-08-01), Mancini
patent: 4073725 (1978-02-01), Takeuchi
patent: 4137161 (1979-01-01), Shimada et al.
A Highly Efficient Carboxylic Acid Analyzer and Its Application by Nakajima et al., in Journal of Chromatography 123 (1976), 129-138.
Design of a High Efficiency Liquid Chromatograph Using Specific Detection and Its Evaluation for Analysis of Tricarboxylic Acid Cycle (TCA) Intermediates and Related Compounds on a Nano-Equivalent Scale by Stahl et al. in Journal of Chromatography Science, vol. 10, (Feb. 1972), pp. 95-102.
Adee John
Showa Denko Kabushiki Kaisha
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