Effectiveness of Dow Chemical DB31 and an Unknown Powder from Peabody for Defoaming Stretford Solution

摘要

DB31 is an effective defoaming agent at concentrations below the levels suggested as typical by the manufacturer, viz. less than 5 ppM. The Peabody powder is not effective if in fact it is a defoaming agent. Before DB31 is added to the solution in the Stretford system, more rigorous laboratory testing should be performed. Tests should be performed at air flow rates per cross sectional area corresponding to the absorption column and the sulfur removal column to more precisely determine the optimum concentration to use. Relatively small incremental quantities should be tried in the actual Stretford unit, perhaps .1 lb at a time (.3 ppM). Changes in absorption column performance should be noted and samples taken for retesting in the laboratory for each incremental addition. If defoamer is required to obtain satisfactory performance from the Stretford unit, control of concentration may become a problem. 2 tables. (ERA citation 09:007225)