EFFECTS OF LOW CONCENTRATION LEVELS OF CALCIUM AND MAGNESIUM IN THE FEED BRINE ON THE PERFORMANCE OF A MEMBRANE CHLORALKALI CELL

被引：19

作者：

MOMOSE, T ^{[1
]}

HIGUCHI, N ^{[1
]}

ARIMOTO, O ^{[1
]}

YAMAGUCHI, K ^{[1
]}

WALTON, CW ^{[1
]}

机构：

[1] UNIV NEBRASKA,DEPT CHEM ENGN,LINCOLN,NE 68588

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1991年 / 138卷 / 03期

关键词：

D O I：

10.1149/1.2085667

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The influence of low concentration levels of calcium and magnesium ions present in the cell feed on the performance of a laboratory membrane-type chlor-alkali electrolysis cell was determined experimentally. The resultant effects appeared mainly as a decrease in current efficiency and an increase in cell potential caused by calcium precipitation primarily in the carboxylate layer (on the cathode side of the Nafion (R) 90209(2) membrane) and magnesium precipitation in the sulfonate layer (on the anode side of the membrane), respectively. Identification and location of the precipitates were obtained by evaluation of the degraded membranes by scanning electron microscopy (SEM) and electron probe x-ray microanalysis (EPMA) after experimental determination of cell potential and current efficiency for various feed brine purities. Physical disruption of the polymer morphology of the carboxylate layer was determined as a possible reason for the decreased caustic current efficiency with calcium accumulation. For the first time, membranes taken from commercial electrolyzers after 2.5 years of service were also evaluated using SEM and EPMA and their performance compared to the laboratory cell results. Evaluation of the commercially used membranes confirmed the validity of the laboratory membrane tests for bilayer films of sulfonate/carboxylate-type combinations.

引用

页码：735 / 741

页数：7

共 16 条

[1]

BISSOT TC, 1985, 167TH M EL SOC TOR

[2]

BISSOT TC, 1986, ELECTROCHEMICAL SOC, P42

[3]

DOTSON RL, 1982, ACS SYM SER, V180, P311

[4]

HASHIMOTO T, 1982, ACS SYM SER, V180, P217

[5]

HINE F, 1985, ELECTRODE PROCESSES, P142

[6]

KEATING JT, 1987, OCT EL SOC M HON

[7]

LICZWEK DL, 1987, OCT EL SOC M HON

[8]

MASUDA FY, 1986, J APPL ELECTROCHEM, V14, P317

[9]

MOLNAR CJ, 1977, 152ND M EL SOC ATL

[10] STUDIES OF THE PH OF THE MEMBRANE-SURFACE IN A LABORATORY CHLORALKALI CELL [J].

OGATA, Y ;

UCHIYAMA, S ;

HAYASHI, M ;

YASUDA, M ;

HINE, F .

JOURNAL OF APPLIED ELECTROCHEMISTRY, 1990, 20 (04) :555-558

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