Foam Control Additives In MSF Desalination

摘要: Abstract Excessive foaming in multistage flash desalination plants can give rise to salt-contaminated distillate and reduced operating efficiency. Plant variations pressure, temperature, flow, seawater feed composition alkalinity perturb vapor/liquid equilibria, resulting increased levels of foam. Since such is not always controlled by mechanical means, additives are often needed control level. In addition controlling foam, a useful additive must interfere with heat transfer or the performance scale additive; it contain steam-volatile components that contaminate distillate; be stable at MSF temperatures residence times; should compatible antiscalant solution. Antifoam data for over 60 candidates 7 chemical classes were determined according these criteria. The most effective structural class was found polyglycol monoalkyl ethers. Foam effectiveness within this shown function ethylene oxide content alkyl chain length. study offered commercially as FLOCON AF-4. AF-4 has been used successfully high-temperature plants.