A device for preparing light potassium carbonate by using urea waste ammonia water

By using a device to prepare light potassium carbonate from urea waste ammonia water, combined with ammonium bicarbonate and potassium chloride solution preparation units, the problem of high waste ammonia water recycling costs has been solved, thereby reducing the production cost of potassium carbonate and achieving efficient resource utilization.

CN224345865UActive Publication Date: 2026-06-12HENAN XINLIANXIN FERTILIZER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HENAN XINLIANXIN FERTILIZER
Filing Date
2025-04-16
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

In existing technologies, the high cost of recovering waste ammonia water, a byproduct of urea production, leads to high production costs for potassium carbonate. Furthermore, traditional methods consume large amounts of steam, resulting in poor efficiency.

Method used

The apparatus for preparing light potassium carbonate from waste ammonia water from urea synthesis is coupled with an ammonium bicarbonate preparation unit and a potassium chloride solution preparation unit. Waste ammonia water produced as a byproduct of urea synthesis is used to synthesize ammonium bicarbonate with carbon dioxide in a carbonation tower, and then an ion exchange reaction is carried out in an ion exchange unit to produce potassium carbonate.

Benefits of technology

It reduces the production cost of potassium carbonate, improves equipment utilization and production efficiency, and achieves effective treatment of waste ammonia water and resource reuse, thus having both environmental and economic benefits.

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Abstract

This utility model relates to an apparatus for preparing light potassium carbonate from urea waste ammonia water; it includes an ammonium bicarbonate preparation unit and a potassium chloride solution preparation unit. The ammonium bicarbonate preparation unit includes a waste ammonia water pipeline from the urea system, which is connected to the inlet of a waste ammonia water tank. The outlet of the waste ammonia water tank is connected to the upper inlet of a carbonation tower via a heat exchanger. A carbon dioxide pipeline is connected to the bottom gas phase inlet of the carbonation tower via a carbon dioxide compressor. The liquid phase outlet at the bottom of the carbonation tower is connected to an ion exchange unit, which is equipped with a potassium bicarbonate solution pipeline connected to the evaporation section. The potassium chloride preparation unit is connected to the ion exchange unit, which is equipped with an ammonium chloride solution pipeline connected to subsequent sections. This apparatus features a reasonable process design, is environmentally friendly, and effectively reduces the production cost of light potassium carbonate while addressing the high investment and operating costs associated with waste ammonia water treatment.
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