Method of cleaning dust-containing gas mixtures from a urea plan

Details Method of cleaning dust-containing gas mixtures from a urea plan Method of cleaning dust-containing gas mixtures from a urea plan

1982-12-22

1985-03-26

Lacey, David L.

Gas separation

Means within gas stream for conducting concentrate to collector

55 84, 564 73, B01D 4706

Patent

active

045071292

ABSTRACT:
Gas mixtures from a urea plant, particularly such mixtures containing dust and especially off-gases from prilling towers or granulation units are cleaned. In order to prevent precipitation and accretion in the cleaning unit, there is applied an aqueous washing solution to which formaldehyde is added before it is brought in contact with the gas mixture. Formaldehyde is preferably added in the form of formaline, and the addition of formaline is regulated by pH-measurements in the washing solution such that pH is maintained at pH=6-8.5. The pH of the washing solution is preferably kept at pH=about 7, especially in order to obtain optimal removal of ammonia. The method is carried out during application of standard scrubbers in which aqueous washing solutions can be used.

REFERENCES:
patent: 2977386 (1961-03-01), Kise
patent: 3951638 (1976-04-01), Bradley
patent: 4104041 (1978-08-01), Arita et al.
patent: 4217114 (1980-08-01), Lagana' et al.

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