Method for purifying by-product gases from a melamine manufacturing installation
OwnerGerhard Coufal, Hans Christian Wagner +1inventors
InventorsGerhard Coufal, Hans Christian Wagner, Wolfgang Ruech
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for purifying the by-product gases that originate in a high-pressure melamine manufacturing installation in a urea wet scrubber. According to said method, CO2 is added to the by-product gases before or during their entry into said urea wet scrubber.
Claims8
A process for cleaning the offgases stemming from a high-pressure melamine plant, which comprises adding CO2 to the offgases before or on entry into the urea scrubber.
A process for combined preparation of melamine and urea, which comprises admixing the offgases resulting from a high-pressure melamine plant with CO2, freeing them of melamine in a urea scrubber and subsequently feeding them to the high-pressure section of a urea plant, while introducing all or some of the urea prepared there into the urea scrubber for preheating and subsequently into a high-pressure reactor for preparing melamine.
Dependencies are inferred from the claim text.