Process and plant for the synthesis of urea

AU2021226686B2Pending Publication Date: 2026-09-03CASALE SA
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Patent Information

Application Number
AU2021226686
Authority / Receiving Office
AU · AU
Patent Type
Applications
Current Assignee / Owner
Priority Date
2020-02-25
Filing Date
2021-02-09
Publication Date
2026-09-03
Estimated Expiration
2041-02-09

AI Technical Summary

Technical Problem

The existing CO2-stripping process for urea synthesis is costly due to the need for expensive high-pressure equipment and complex installation layouts, and existing modifications either require the condenser to withstand synthesis pressure or penalize stripper ammonia efficiency by diverting CO2 directly to the reactor.

Method used

The process and plant design involve feeding full CO2 to the stripper, splitting stripper vapors to optimize efficiency, using a shell-and-tube kettle condenser where high-pressure fluids are confined to the tube side, and potentially using an ejector to reduce equipment elevation, eliminating the need for a high-pressure scrubber and minimizing inert gas accumulation.

Benefits of technology

This design reduces capital costs by simplifying the installation and reducing the elevation of the synthesis loop, maintaining stripper efficiency, and minimizing equipment costs while allowing for efficient heat recovery and reduced steam consumption.

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Abstract

A process for synthesis of urea from ammonia and carbon dioxide wherein: the urea synthesis is performed with a stripping process in a synthesis loop including at least a reactor (1), a stripper (2) and a condenser (3); the reactor effluent is treated in the stripper to remove unreacted ammonia and carbon dioxide; the urea solution (14) from the stripper is sent to a low-pressure recovery section (4); the stripper vapours are split into a first portion (151) directed to the reactor and a second portion (152) sent to the condenser; the condenser (3) is a shell-and-tube kettle condenser where condensation of stripper vapours is performed in the tube side (30); a carbamate-containing effluent (20) from the condenser is returned to the reactor.
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Citation Information

Patent Citations

  • Method for modernizing a urea production plant

    EP1036787A1