The oxidation technique employs an oxide catalyst for a direct oxidation route to formaldehyde. In this process, a mixture of liquid methanol, air and recycled stack gases are fed into an evaporator.
The gas mixture from the evaporator is then fed into a fixed bed tube reactor, and charged with a molybdenum-based catalyst. The methanol content is maintained at 6-10 % of volume.
Vaisala K-PATENTS® Process Refractometer PR-43-G is mounted after the formaldehyde pump. With the refractometer the formaldehyde concentration can be measured and maintained within the specified limits. Typical product concentrations vary between 37 % and 45 %.
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