Process for reducing the ammonia content of a gaseous effluent from urea production plants
First Claim
Patent Images
1. A process for neutralizing the ammonia present in the molten urea originating from the concentration section of a plant for its production, comprising adding to the molten urea a small quantity of an inorganic acid wherein said quantity is between about 0.25% and 0.45% based on the weight of the molten urea.
1 Assignment
0 Petitions
Accused Products
Abstract
A process for neutralizing the ammonia present in the molten urea originating from the concentration section of a plant for its production, comprising adding to the molten urea a small quantity of an acid.
-
Citations
7 Claims
- 1. A process for neutralizing the ammonia present in the molten urea originating from the concentration section of a plant for its production, comprising adding to the molten urea a small quantity of an inorganic acid wherein said quantity is between about 0.25% and 0.45% based on the weight of the molten urea.
- 3. A process for limiting the ammonia content of a gaseous effluent from a urea solidification section of a urea production plant to a maximum of about 8 mg/Nm3, which comprises concentrating an aqueous urea solution in a vacuum concentration section to obtain molten urea containing at least 96% by weight of urea and residual ammonia, transferring said molten urea to said solidification section, and solidifying the molten urea by contact with an air stream to obtain substantially pure solid urea, wherein an acid selected from the group consisting of sulfuric acid and phosphoric acid is added to said molten urea before it enters said solidification section, in an amount comprised from about 0.25% to 0.45% by weight based on the weight of the molten urea.
Specification