Further developments in the high temperature electrodialysis

✍ Scribed by T. Bejerano; Ch. Forgacs; J. Rabinowitz

• Publisher: Elsevier Science
• Year: 1967
• Tongue: English
• Weight: 496 KB
• Volume: 3
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/0011-9164(67)80001-8

✦ Synopsis

StJMM4RY 'RX high temperature e~~~r~~aI~is method being developed in the NC&W Institute for Arid Zone Research utilizes the Joule he-at c~&ed in the prms to increase the temprraturr of operation thus &dng the energy consumption of the process. initial ~kulatio~s indicated that by suitable increase of temperature the enerw consumption may be reduced as much HIS (50-70 y& The economic of the pravrs satm sufkicntiy favourabk to iustify its apptication to sea water dcsalinarion. During the first period af the research it was shown that commercially available meznbtwtes p-e their ekctrochenticai propertics at elevated temperatures, and their functional groups w&fistand high tcmpcature conditions. Deterioration of membranes, if it occurs. is due to disintwtion of the matrix of the membranes. Mo= entcnsj,e invutigatiot? of lhc changes in membrane resistance with temperature has shown that it decrczses much more markediy below the range X3-80'C than above it. it was a&~ found that ekctroosmotic water transfer through membranes increases. especially in the higher temperature region (70-100 C). This behavior of membranes was resected in the results obtained from iaboratory s&e hi& tcmpcrature clectrodialysis experiments. Tfre saving of energy consumption by increasing the tempcraturc of operation from 3O'C to 70°C was 6+~~~<. with different types of membranes. Further increase in trmperature contributed ies~ substantially to the decrease in energy consumption.

During these experiments it became evident that eI~tr~iaIysis ~p~~tus buift from convenrionat matcri&s of construction