Process for purifying off-gases of a melamine plant

Details Process for purifying off-gases of a melamine plant Process for purifying off-gases of a melamine plant

2007-12-25

2007-12-25

Greene, Jason (Department: 1724)

Gas separation: processes

Liquid contacting

And recycle or reuse of contact liquid for further contact

C544S200000, C544S201000, C544S203000, C055S423000, C260S001000, C260S66500B, C260S66500B, C260S66500B

Reexamination Certificate

active

10495310

ABSTRACT:
A two-stage process is provided for purifying off-gases from a high-pressure melamine plant. In the first stage, the off-gases are contacted with a recirculated urea melt containing melamine precursors and NH3. In the second stage, the off-gases are contacted with a fresh urea melt.

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International Search Report of PCT/DE02/04250, dated Mar. 28, 2003.
International Preliminary Examination Report of PCT/DE02/04250, dated Jul. 11, 2003.
Russian Decision to grant dated Dec. 18, 2006, for corresponding application.

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