METHOD FOR ANALYZING AQUEOUS AMMONIUM CARBAMATE SOLUTION, AND METHOD FOR OPERATING UNREACTED GAS-ABSORPTION TANK

Title:

METHOD FOR ANALYZING AQUEOUS AMMONIUM CARBAMATE SOLUTION, AND METHOD FOR OPERATING UNREACTED GAS-ABSORPTION TANK

Document Type and Number:

WIPO Patent Application WO/2010/137454

Kind Code:

A1

Abstract:

Disclosed are a method for analyzing an aqueous ammonium carbamate solution whereby the composition of a liquid discharged from the outlet of an unreacted gas-absorption tank can be specified in real time, and a method for operating the unreacted gas-absorption tank using the same. Specifically disclosed is a method for analyzing the composition of an aqueous ammonium carbamate solution, whereby the ammonia component concentration, carbon dioxide component concentration and water concentration of the aqueous ammonium carbamate solution, which is a liquid discharged from the outlet of an unreacted gas-absorption tank in the process for producing urea, are determined using the correlation among the viscosity, temperature and carbon dioxide component concentration of said aqueous solution and the correlation among the density, temperature and ammonia component concentration of said aqueous solution, provided that said ammonia component concentration means the sum of free ammonia and equivalent ammonia calculated as ammonium carbamate contained in said aqueous solution, and said carbon dioxide component concentration means the concentration of equivalent carbon dioxide calculated as ammonium carbamate contained in said aqueous solution.

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Inventors:

SAKATA EIJI (JP)
YOSHIMOTO KENJI (JP)
NAKAMURA SHUHEI (JP)

Application Number:

PCT/JP2010/057989

Publication Date:

December 02, 2010

Filing Date:

May 12, 2010

Export Citation:

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Assignee:

TOYO ENGINEERING CORP (JP)
SAKATA EIJI (JP)
YOSHIMOTO KENJI (JP)
NAKAMURA SHUHEI (JP)

International Classes:

G01N33/00; C07C273/04

Foreign References:

JP2003104949A	2003-04-09
JP2002145850A	2002-05-22

Other References: