Preparation of two-phase absorbent with ethylenediamine and dma for CO removal from biohydroalkanes 2 Methods

An ethylenediamine and absorbent technology, which is applied in the fields of energy saving, environmental protection and CO2 emission reduction, can solve the problems of high cost, limited engineering application of two-phase absorbent, strong volatility, etc., and achieves increased absorption capacity, shortened absorption balance time, The effect of increasing the removal rate

Active Publication Date: 2020-04-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The solvents used in the above-mentioned solid-liquid two-phase decarburization system, such as ionic liquids, methyl silicone oil, or polyethylene glycol, are relatively expensive, or ethanol is too volatile, which severely limits the engineering application of such two-phase absorbents.

Method used

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  • Preparation of two-phase absorbent with ethylenediamine and dma for CO removal from biohydroalkanes <sub>2</sub> Methods

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh the theoretically absorbed CO 2 Capacity is 1.0mol CO 2 / mol chain amine-based absorbent ethylenediamine (EDA), mixed with low-volatility liquid organic solvent N,N-dimethylacetamide (DMA) according to the mass ratio of 1:50, mechanically stirred at room temperature for 5 Minutes to obtain a homogeneously mixed EDA / DMA liquid two-phase absorbent. Use a high-pressure pump to send the liquid two-phase absorbent EDA / DMA into the spray decarburization reactor, form atomized droplets through the nozzle and flow from top to bottom, and biohydrocarbon gas (volume concentration of each component) flowing from bottom to top 21% H 2 , 40% CH 4 , 38% CO 2 , 0.8% H 2 S, 0.2% H 2 O) Perform countercurrent mixing. CO in hydrogen gas 2 First, it is physically dissolved in DMA solvent, and then chemically reacts with the absorbent EDA to form a solid precipitate of EDA-carbamate. The test results are: two-phase absorbent EDA / DMA removes CO 2 Rate ratio of alcohol amine ...

Embodiment 2

[0026] Weigh the theoretically absorbed CO 2 Capacity is 1.0mol CO 2 / mol chain amine-based absorbent ethylenediamine (EDA), mixed with low volatility liquid organic solvent N,N-dimethylacetamide (DMA) according to the mass ratio of 1:40, mechanically stirred at room temperature for 10 Minutes to obtain a homogeneously mixed EDA / DMA liquid two-phase absorbent. Use a high-pressure pump to send the liquid two-phase absorbent EDA / DMA into the spray decarburization reactor, form atomized droplets through the nozzle and flow from top to bottom, and biohydrocarbon gas (volume concentration of each component) flowing from bottom to top 5% H 2 , 63% CH 4 , 30% CO 2 , 1% H 2 S, 1% H 2 O) Perform countercurrent mixing. CO in hydrogen gas 2 First, it is physically dissolved in DMA solvent, and then chemically reacts with the absorbent EDA to form a solid precipitate of EDA-carbamate. The test results are: two-phase absorbent EDA / DMA removes CO 2 Rate ratio of alcohol amine aqueo...

Embodiment 3

[0028] Weigh the theoretically absorbed CO 2 Capacity is 1.0mol CO 2 / mol chain amine-based absorbent ethylenediamine (EDA), mixed with low volatility liquid organic solvent N,N-dimethylacetamide (DMA) according to the mass ratio of 1:30, mechanically stirred at room temperature for 15 Minutes to obtain a homogeneously mixed EDA / DMA liquid two-phase absorbent. Use a high-pressure pump to send the liquid two-phase absorbent EDA / DMA into the spray decarburization reactor, form atomized droplets through the nozzle and flow from top to bottom, and biohydrocarbon gas (volume concentration of each component) flowing from bottom to top 14% H 2 , 35% CH 4 , 50% CO 2 , 0.2% H 2 S, 0.8% H 2 O) Perform countercurrent mixing. CO in hydrogen gas 2 First, it is physically dissolved in DMA solvent, and then chemically reacts with the absorbent EDA to form a solid precipitate of EDA-carbamate. The test results are: two-phase absorbent EDA / DMA removes CO 2 Rate ratio of alcohol amine...

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Abstract

The invention relates to technologies of energy conservation and environmental protection as well as CO2 emission reduction, and aims to provide a method for removing CO2 from biological hydrogen alkane gas by a phase-changing solvent prepared from ethylenediamine and DMA (N,N-dimethylacetamide). The method comprises steps as follows: after being obtained from ethylenediamine and DMA through mixing, a liquid phase-changing solvent is sent into a spray decarbonization reactor, atomized, sprayed and subjected to countercurrent mixing with biological hydrogen alkane gas; solid precipitates produced through the reaction are subjected to solid-liquid two-phase separation with a liquid DMA solvent, and after gaseous phase products produced from the solid precipitates through heating decomposition are condensed and ethylenediamine is recovered, CO2 gas is collected and sent to a gas storage tank; the liquid DMA solvent obtained through separation, heating and condensation is recycled. With adoption of the novel solid-liquid phase-changing solvent prepared from ethylenediamine and DMA, the removal rate of CO2 in the biological hydrogen alkane gas is increased; compared with a traditionalalkylol amine aqueous solution EDA / H2O, the phase-changing solvent EDA / DMA has the advantages that the CO2 removal rate is increased by 15%-29%, the absorption balance time is shortened by 8%-20%, andCO2 absorption capacity is increased by 10%-21%.

Description

technical field [0001] The present invention is about energy saving and environmental protection and CO 2 Emission reduction technology, in particular to a two-phase absorbent prepared by using ethylenediamine and N,N-dimethylacetamide (abbreviated as DMA) to remove CO from biohydrogen alkane gas 2 Methods. Background technique [0002] Due to environmental pollution and energy shortages, biogas treatment and subsequent utilization have received more and more attention. Biological hydrogen alkane gas can be obtained by two-phase fermentation of biomass waste, and its main component is CH 4 / H 2 / CO 2 of mixed gas. CO in the gas mixture 2 Removal can be used to obtain vehicle gas, which can achieve significant environmental and economic benefits. [0003] Aqueous solutions of alcohol amines such as monoethanolamine, diethanolamine, and N-methyldiethanolamine have been widely used to absorb CO 2 , but there are problems of high heating energy consumption, reagent volat...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01B3/52B01D53/14C10L3/10
CPCB01D53/1475B01D53/1493C01B3/52C10L3/104Y02C20/40Y02P20/151
Inventor程军周俊虎刘建忠岑可法王智化杨卫娟张彦威周志军何勇
OwnerZHEJIANG UNIV