# US 2018/0321122 A1 · System for analyzing carbon dioxide concentration of amine-based absorbing solution, carbon dioxide recovery system, and method of operating the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0321122 A1 - Document ID: US20180321122A1 - Status: Published application - Kind: A1 - Application number: 15/773,837 - Filed: 2016-10-26 - Published: 2018-11-08 - Earliest claimed: 2015-11-05 - Assignees: Mitsubishi Heavy Industries Engineering, Ltd. - Applicants: Mitsubishi Heavy Industries Engineering, Ltd. - Inventors: Takuya Hirata; Masakazu Sakaguchi; Tatsuya Tsujiuchi; Hiroshi Tanaka - Web page: https://patentgrep.com/patent/US20180321122A1 ## CPC - G01N 11/00: Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties - B01D 53/1412: {Controlling the absorption process} - B01D 53/1418: {Recovery of products} - B01D 53/1425: {Regeneration of liquid absorbents} - B01D 53/1475: {Removing carbon dioxide} - G01N 29/024: by measuring propagation velocity or propagation time of acoustic waves - G01N 33/00: Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00 - B01D 2252/204: Amines - B01D 2257/504: Carbon dioxide - Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters - Y02C 20/40: of CO2 - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG] ## Abstract A system for analyzing a CO2 concentration of an amine-based absorbing solution includes a measurement apparatus that measures a viscosity of the amine-based absorbing solution and at least one selected from conductivity and ultrasonic propagation velocity of the amine-based absorbing solution, wherein the amine-based absorbing solution absorbs and removes CO2 from a target gas by gas-liquid contact with the target gas; and a controller that determines the CO2 concentration of the amine-based absorbing solution from results measured by the measurement apparatus. ## Claims ### Claim 1 A system for analyzing a CO2 concentration of an amine-based absorbing solution, the system comprising: a measurement apparatus that measures a viscosity of the amine-based absorbing solution and at least one selected from conductivity and ultrasonic propagation velocity of the amine-based absorbing solution, wherein the amine-based absorbing solution absorbs and removes CO2 from a target gas by gas-liquid contact with the target gas; and a controller that determines the CO2 concentration of the amine-based absorbing solution from results measured by the measurement apparatus. ### Claim 2 (depends on 1) The system according to claim 1, wherein the controller determines the CO2 concentration of the amine-based absorbing solution by correcting the measured conductivity of the amine-based absorbing solution using the measured viscosity thereof based on a correlation between a corrected value of the conductivity of the amine-based absorbing solution using the viscosity thereof and the CO2 concentration of the amine-based absorbing solution. ### Claim 3 (depends on 1) The system according to claim 1, wherein the controller determines the CO2 concentration and an amine concentration of the amine-based absorbing solution from the measured viscosity and the measured conductivity or ultrasonic propagation velocity of the amine-based absorbing solution based on a correlation among viscosity of the amine-based absorbing solution, conductivity or ultrasonic propagation velocity of the amine-based absorbing solution, the CO2 concentration and the amine concentration of the amine-based absorbing solution. ### Claim 4 (depends on 1) The system according to claim 1, wherein the controller determines the CO2 concentration and an amine concentration of the amine-based absorbing solution from three measured values of the ultrasonic propagation velocity, viscosity, and conductivity of the amine-based absorbing solution based on a correlation among a corrected value of the ultrasonic propagation velocity of the amine-based absorbing solution using the viscosity thereof, the conductivity or a corrected value of the conductivity of the amine-based absorbing solution using the viscosity thereof, the CO2 concentration and the amine concentration of the amine-based absorbing solution. ### Claim 5 (depends on 1) The system according to claim 1, wherein the measurement apparatus measures a temperature of the amine-based absorbing solution, and wherein the controller determines the CO2 concentration of the amine-based absorbing solution or the CO2 concentration and an amine concentration of the amine-based absorbing solution from a measured viscosity of the amine-based absorbing solution, at least one selected from the measured conductivity and the measured ultrasonic propagation velocity of the amine-based absorbing solution, and the measured temperature of the amine-based absorbing solution. ### Claim 6 (depends on 1) The system according to claim 1, wherein the measurement apparatus measures the viscosity and at least one selected from conductivity and ultrasonic propagation velocity of the amine-based absorbing solution at a certain temperature after the amine-based absorbing solution is adjusted to the certain temperature. ### Claim 7 (depends on 1) A CO2 recovery system comprising: the system for analyzing a CO2 concentration of an amine-based absorbing solution according to claim 1; a CO2 absorption tower that removes the CO2 from target gas by bringing the target gas containing the CO2 into gas-liquid contact with the amine-based absorbing solution and causing the amine-based absorbing solution to absorb CO2; and an absorbing solution regeneration tower that regenerates the amine-based absorbing solution by releasing the CO2 from the amine-based absorbing solution that has absorbed CO2 in the CO2 absorption tower. ### Claim 8 (depends on 7) A method of operating the CO2 recovery system according to claim 7, the method comprising: measuring the viscosity of the amine-based absorbing solution and at least one selected from conductivity and ultrasonic propagation velocity of the amine-based absorbing solution; and determining the CO2 concentration of the amine-based absorbing solution from results comprising a measured viscosity and at least one selected from a measured conductivity and a measured ultrasonic propagation velocity of the amine-based absorbing solution.