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Non-aqueous chemical absorbent for separating and purifying carbon dioxide

A carbon dioxide, chemical absorption technology, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of difficulty in maintaining the stability of the absorbent, complex system components, and high viscosity of the absorbent, and reduce sensible heat and The effect of latent heat of vaporization, high cycle absorption capacity and stable absorption performance

Inactive Publication Date: 2018-03-13
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the non-aqueous absorbents involved in the published patents and literatures are multi-component composite absorbents, which can reduce regeneration energy consumption to a certain extent, but there are also some problems in these systems: for example, the system components are relatively complex , the absorption capacity is small, and the stability of the recycling of the absorbent is difficult to maintain; the viscosity of the absorbent also affects the absorption rate, etc.

Method used

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  • Non-aqueous chemical absorbent for separating and purifying carbon dioxide
  • Non-aqueous chemical absorbent for separating and purifying carbon dioxide
  • Non-aqueous chemical absorbent for separating and purifying carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 100 grams of ethylene glycol butyl ether solution with a mass fraction of 20% ethanolamine to a split-type cold hydrazine with a height of 20 cm and an outer diameter of 3 cm, and place the device in a constant temperature water bath at 30 ° C; The flow rate is about 0.2 liters per minute, the gas is absorbed by bubbling in cold hydrazine, the exhaust gas passes through the grid snake condenser, and then enters the carbon dioxide analyzer after passing through the gas dryer to continuously measure the content at the outlet, and stop when the carbon dioxide content exceeds 23%. Experiment: Shake the absorption solution and accurately weigh 2.0 grams of the sample, transfer it to the Erlenmeyer flask, add 30 ml of water, add excess dilute sulfuric acid with a concentration of 0.3M, measure the volume of the released gas, and calculate the absorption load of carbon dioxide as The ratio of the number of moles of carbon dioxide in the solution to the weight of the absorbi...

Embodiment 2

[0026] In the absorption-desorption experimental setup (see figure 1 ) into the mixed gas with a content of about 13% carbon dioxide (nitrogen is an inert gas), the flow rate is about 0.8 liters per minute, the device is placed in a constant temperature water bath at 40°C, and the gas enters the carbon dioxide analyzer continuously after passing through a disperser and a dryer. Measure the content of the discharge outlet, and after the outlet reading is stable, quickly add 150 grams of fresh absorbents prepared with different compositions, and the tail gas enters the carbon dioxide analyzer to continuously measure the content of the discharge outlet after passing through the grid snake condenser and gas dryer. Stop the experiment when the carbon dioxide content reaches 95% of the inlet concentration; shake the absorption solution and accurately weigh 2.0 grams of the sample, transfer it to a conical flask, add 30 ml of water, add excess dilute sulfuric acid with a concentration...

Embodiment 3

[0030] In the absorption-desorption experimental setup (see figure 1 ) into the mixed gas with a content of about 15% carbon dioxide (nitrogen is an inert gas), the flow rate is about 0.8 liters per minute, the device is placed in a constant temperature water bath at 40°C, and the gas enters the carbon dioxide analyzer continuously after passing through a disperser and a dryer. Measure the content of the discharge outlet, and after the outlet reading is stable, quickly add 150 grams of the prepared 30wt% MEA + 70wt% EGME non-water absorbent, and the exhaust gas passes through the grid snake condenser and gas dryer and then enters the carbon dioxide analyzer for continuous measurement. The content of the outlet, when the carbon dioxide content reaches 85% of the inlet concentration, the absorption experiment is stopped; after the absorption liquid is shaken, 2.0 grams of the sample is accurately weighed, and the absorption load of carbon dioxide is measured. Rapidly raise the t...

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Abstract

The invention provides a non-aqueous chemical absorbent for treating carbon dioxide in gas mixtures, and belongs to the field of technologies for capturing carbon dioxide. The non-aqueous chemical absorbent comprises, by weight, 20%-50% of organic alcohol amine and 50-80% of alcohol ether solvents. The non-aqueous chemical absorbent has the advantages that the non-aqueous chemical absorbent whichis a carbon dioxide absorbent is high in absorption rate, absorption capacity and rate and low in desorption temperature, and the solvents are low in volatility, specific heat capacity and latent heatof vaporization; energy consumption and the cost of capturing procedures can be effectively reduced as compared with the traditional aqueous solution systems, the non-aqueous chemical absorbent can be applied to processes for capturing and separating carbon dioxide in the gas mixtures such as natural gas, synthesis gas and flue gas from power plants, and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide capture and relates to a non-aqueous chemical absorbent for treating carbon dioxide in a gas mixture. Background technique [0002] Global warming and climate change are among the most serious and most concerned environmental issues today. The scientific community generally believes that a large amount of carbon dioxide (CO2) emitted by human industrial activities 2 ) gases are the main contributors to global warming. 2016 World CO 2 Emissions reached 36.3 billion tons, and the carbon dioxide capture, storage and utilization (CCSU) project is the most effective technical direction to achieve carbon emission reduction and tackle global warming. At present, organic amine aqueous solution captures CO 2 Process regeneration energy consumption is about 4.0 GJ / ton CO 2 , the energy consumption cost of the process accounts for about 60-80% of the total capture cost, and the technical status o...

Claims

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Application Information

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IPC IPC(8): B01D53/14C10L3/10
CPCB01D53/1425B01D53/1475B01D53/1493B01D2252/202B01D2252/2025B01D2252/20478B01D2252/20484B01D2252/40B01D2252/504B01D2258/0283C10L3/104Y02C20/40
Inventor 申淑锋郭晖李慧
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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