CN103432884A - Composite organic acid salt solution for absorbing sulfur dioxide - Google Patents

Composite organic acid salt solution for absorbing sulfur dioxide Download PDF

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CN103432884A
CN103432884A CN2013102846104A CN201310284610A CN103432884A CN 103432884 A CN103432884 A CN 103432884A CN 2013102846104 A CN2013102846104 A CN 2013102846104A CN 201310284610 A CN201310284610 A CN 201310284610A CN 103432884 A CN103432884 A CN 103432884A
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acid salt
tartrate
aqueous solution
organic acid
sulfur dioxide
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CN103432884B (en
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陆建刚
陆春婷
陈悦
陈雪
张慧
许正文
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Dajing Information Chemical Xuzhou Co ltd
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Nanjing University of Information Science and Technology
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Abstract

The invention relates to the field of liquid-gas separation, in particular to the field of flue gas desulfurization, and more particularly relates to a composite organic acid salt solution for absorbing sulfur dioxide. The invention aims to provide a sulfur dioxide absorbent which can be used for absorption of a membrane contactor. The invention discloses an organic acid salt aqueous solution, which consists of tartrate and amino acid salt aqueous solution, wherein the mixing molar ratio of the tartrate to the amino acid salt is 1: (0.5-2.8). The solution of organic acid salt provided by the invention has the advantages of good chemical stability, small foamability, small viscosity, rich raw material source, easy purchase and low price. The desulfurization process using the organic acid salt solution disclosed by the invention has the advantages of high mass transfer coefficient, no disturbance of gas-liquid flow, small mass transfer resistance, high desulfurization rate, convenience in operation, high operation flexibility, no secondary pollution and capability of stably running in a membrane contactor.

Description

Composite organic acid salting liquid for sulfur dioxide absorption
Technical field
The present invention relates to liquid gas separation field, particularly relate to the desulfuration field of flue gas, more specifically relate to the composite organic acid salting liquid for sulfur dioxide absorption.
 
Background technology
SO in the flue gas such as coal-burning power plant, metallurgy industry 2being one of Air Pollutant Discharge, is the formation source of acid rain.The raising day by day Air Pollutant Emission required along with environmental protection, in flue gas desulfurization purifies, reasonable selection sulfur removal technology how, reach SO after flue gas desulfurization with low investment and operating cost 2discharge capacity meets the regulation of discharging standards, is the key issue that the flue gas desulfurizations such as coal-burning power plant, metallurgy industry develop in a healthy way.Therefore, various high-performance SO 2the exploitation of absorbent is one of theme of this area research, and in recent years, composite absorber was because its unique performance has become the heat subject of acid gas absorbent research and development.
In flue gas desulfurization (Flue gas desulfurization is called for short FGD) technology, the method common by the kind of desulfurizing agent has: with CaCO 3(lime stone) is basic calcium method, take MgO as basic magnesium method, with Na 2sO 3for basic sodium method, with NH 3for basic ammonia process, take organic base as basic organic alkaline process.Commercialization flue gas desulfurization more than 90% adopts calcium method desulfur technology in the world, and the calcium method is divided into wet method, dry method and half-dried (half is wet) method.Wet technique is to adopt solution or the slurries contain absorbent to process sulfur-containing smoke gas, and this method has that desulphurization reaction speed is fast, equipment simple, the desulfuration efficiency advantages of higher, but the ubiquity seriously corroded, operation and maintenance cost is high and cause secondary pollution problems.Dry technique is that the processing of absorption process and product is all carried out under anhydrous state, this method have without spent acid sewage discharge, equipment corrosion is lighter, the problems such as flue-gas temperature is without the advantage such as obviously reducing, secondary pollution is few, but exists desulfuration efficiency low, and reaction speed is slow, equipment is huge.Semi-dry process refers to desulfurizing agent desulfurization under drying regime, regeneration under wet condition (as washing regenerating active carbon flow process), or desulfurization under wet condition, processes the flue gas desulfurization technique of desulfurization product (as spray drying process) under dry state.Particularly desulfurization under wet condition, process the semidry method of desulfurization product under dry state, with its advantage that existing wet desulphurization reaction speed is fast, desulfuration efficiency is high, have again dry method without the sewage spent acid discharge, the easy-to-handle advantage of desulfurization afterproduct and be subject to people and pay close attention to widely.In chemical absorbing flue gas desulfurization, the performance of absorbent has fundamentally determined SO 2the efficiency of absorption operation, thereby the performance of absorbent is had to very high requirement.Carry out chemical absorbing SO for flue gas 2process, in order to strengthen mass transport process, improve desulfuration efficiency, reduce investment and the operating cost of equipment, also must possess certain requirement to desulfurizer and operation.
The composite absorber compatibility premium properties of single absorbent, higher mass transfer force, higher absorptive capacity, higher absorption rate and regeneration rate can be provided in absorption process.Therefore composite absorber has higher premium properties, in the flue gas desulfurization field, has obtained paying close attention to widely and applying.
Membrane gas absorption technology (being called for short film absorbs) is separated the new gas separation process combined with the solvent absorption gas technology as film, adopt membrane contactor as desulfurizer, it has stable mass transfer interface, high-specific surface area, high mass transfer efficiency, energy consumption is low, the advantages such as device volume is little, and stable operation and elasticity are large; Microporous barrier in membrane contactor is only the barrier between gas-liquid two-phase, and to the separation non-selectivity of gas, absorbent provides high selectivity and high drive in separation process.Therefore exploitation and membrane material mutually the high-performance absorbent of compatibility there is the meaning of particular importance.At present, absorb SO for membrane contactor 2composite absorber is less, and absorbent properties also need to improve.We absorb SO at film 2lot of experiments work has been done in the composite absorber aspect, has proposed the composite absorber of novel and high-efficiency, at present at gas cleaning SO 2field has no uses and reports.
Summary of the invention
The object of the present invention is to provide a kind of sulfur dioxide absorbent that can absorb for membrane contactor.
Concrete scheme is as follows:
1, a kind of salting liquid of the composite organic acid for sulfur dioxide absorption, be comprised of the aqueous solution of tartrate and amino-acid salt, and described tartrate is 1:(0.5 ~ 2.8 with the mol ratio of mixing of amino-acid salt).
2, the mixture that described amino-acid salt is any one or two kinds in Beta-alanine salt or glycinate.
3, described amino-acid salt is sodium salt or sylvite.
4, described tartrate is sodium tartrate or potassium tartrate.
5, the aqueous solution that the described acylate aqueous solution is sodium tartrate and Beta-alanine sodium, be perhaps the aqueous solution of sodium tartrate and Beta-alanine potassium, be perhaps the aqueous solution of potassium tartrate and Beta-alanine sodium, be perhaps the aqueous solution of potassium tartrate and Beta-alanine sodium, be perhaps the aqueous solution of sodium tartrate and Sodium Glycinate, be perhaps the aqueous solution of sodium tartrate and glycine potassium, or be the aqueous solution of potassium tartrate and Sodium Glycinate, or be the aqueous solution of potassium tartrate and glycine potassium.
6, the total concentration of described acylate aqueous solution mesotartrate and amino-acid salt is 0.1 ~ 3.0mol/L.
7, the total concentration of described acylate aqueous solution mesotartrate and amino-acid salt is 0.5~2.0mol/L.
8, described tartrate and amino-acid salt mol ratio are 1:(1~1.8).
It is good that the acylate that the present invention proposes holds two grandfather's chemical stabilities, and foaminess is little, and viscosity is little, nontoxic, and raw material sources are abundant, easily buys low price.Apply acylate solution disclosed by the invention and there is high mass tranfer coefficient as trapping agent in sulfur removal technology, the Liquid Flow undisturbed, resistance to mass tranfer is little, and desulfurization degree is high, easy to operate, and operating flexibility is large, can stable operation in membrane contactor.The desulfuration solution non-scaling, do not stop up simultaneously, corrosion-free.The acylate solution that the present invention proposes can be used as laminated desulfurizer in membrane contactor, can certainly in tower class reactor (as bubble tower, packed tower, plate column etc.), use.
 
The accompanying drawing explanation
Fig. 1 is that film absorbs SO 2middle trapping agent absorbent properties evaluating apparatus.
Wherein:
1-1-N 2gas bomb, 1-2-SO 2gas bomb, 2-gas Quality Control instrument, 3-mixing steady-flow tank, 4-membrane contactor, 5-peristaltic meatering pump, 6-the first solution storage trough, 7-the second solution storage trough, 8-infrared gas analyser, P-pressure gauge, A-sample point.
 
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiment 1
The trapping absorbent properties evaluation method that is used for the composite organic acid salting liquid of sulfur dioxide absorption.
Operating condition: room temperature (19-22 ℃), mixture pressure 0.11MPa, membrane mass transfer area 1.5 m 2, gas flow rate 0.5-2 L/min, flow rate of liquid 200-500mL/min.
As shown in Figure 1, respectively from N 2gas bomb 1-1 and SO 2the gas of gas bomb 1-2, after gas Quality Control instrument 2 metering, enters and mixes steady-flow tank 3 and form containing the 0.1%-0.6%(percentage by volume) SO 2gaseous mixture, the gaseous mixture after the air-flow current stabilization enters in membrane contactor 4, SO in gaseous mixture 2diffuse to the film opposite side by fenestra, absorbed by compound trapping agent, enter liquid phase, the gas phase after absorption is emitted from membrane contactor other end gas vent, and the compound trapping agent in membrane contactor is from the first solution storage trough 6.Compound trapping agent is extracted out by peristaltic meatering pump 5, and the compound trapping agent in the first solution storage trough 6 is sent in membrane contactor 4, thus the SO that the trapping diffusion is come 2.Compound trapping agent after use is discharged from membrane contactor 4, and is stored by the second solution storage trough 7.
Gas phase is imported and exported to be comprised of infrared gas analyser 8 and is measured.Solution component through the sampling after, by hplc determination, liquid phase SO 2content adopts spectrophotometry.
Above-mentioned compound trapping agent refers to acylate solution disclosed in this invention.
Evaluation criterion:
The cumulative volume mass tranfer coefficient k g a:
Figure 910565DEST_PATH_IMAGE001
SO 2removal efficiency η:
Figure 640754DEST_PATH_IMAGE002
In formula g, awith lbe respectively gaseous phase volume flow velocity, film cross-sectional area and film length, c g, inwith c g, outbe respectively gas phase and import and export SO 2concentration.
 
Embodiment 2
The aqueous solution that is potassium tartrate/sodium tartrate and glycinate for the composite organic acid salting liquid of sulfur dioxide absorption at the present embodiment, potassium tartrate/sodium tartrate and the glycine total concentration in the aqueous solution is 0.1 ~ 3.0mol/L, and the mol ratio of potassium tartrate/sodium tartrate and glycinate is 1:(0.5 ~ 2.8).
Glycinate can be the mixture of Sodium Glycinate, glycine potassium or Sodium Glycinate and glycine potassium in the present embodiment.
Adopt the method for evaluating performance in embodiment 1 to be detected.
Process condition: room temperature, gaseous pressure 0.11MPa, gaseous mixture SO 2content 0.1%-0.6%(percentage by volume), membrane mass transfer area 1.5m 2, gas speed: 0.5-2L/min, liquid speed: 200-500mL/min.
Various desulfurizing agents Evaluation results under various conditions is shown in Table 1.
Table 1 laminated desulfurizer Evaluation results
Figure 482808DEST_PATH_IMAGE004
Result shows: compound trapping agent adaptability disclosed by the invention is high, not only adapts to low-concentration flue gas, also adapts to high-concentration fume, the concentration of absorbing wide ranges of use, and gas-liquid speed operating flexibility is large, SO 2removal efficiency is high, is greater than 99%, and the film device mass tranfer coefficient is large, between 0.20 ~ 0.31.
 
Embodiment 3
In the present embodiment, the aqueous solution that the composite organic acid salting liquid that is used for sulfur dioxide absorption is potassium tartrate/sodium tartrate and Beta-alanine salt, potassium tartrate/sodium tartrate and the total concentration of Beta-alanine salt in the aqueous solution are 0.1 ~ 3.0mol/L, and the mol ratio of potassium tartrate/sodium tartrate and Beta-alanine salt is 1:(0.5 ~ 2.8).
Beta-alanine salt can be the mixture of Beta-alanine sodium, Beta-alanine potassium or Beta-alanine sodium and Beta-alanine potassium in the present embodiment.
Adopt the method for evaluating performance in embodiment 1 to be detected.
Process condition: room temperature, gaseous pressure 0.11MPa, gaseous mixture SO 2content 0.1%-0.6%(percentage by volume), membrane mass transfer area 1.5m 2, gas speed: 0.5-2L/min, liquid speed: 200-500mL/min.
Various desulfurizing agents Evaluation results under various conditions is shown in Table 2.
Table 2 laminated desulfurizer Evaluation results
Figure 2013102846104100002DEST_PATH_IMAGE005
Result shows: compound trapping agent adaptability is high, not only adapts to low-concentration flue gas, also adapts to high-concentration fume, the concentration of absorbing wide ranges of use, and gas-liquid speed operating flexibility is large, SO 2removal efficiency is high, is greater than 99%, and the film device mass tranfer coefficient is large, at 0.20-0.30.

Claims (8)

1. the salting liquid of the composite organic acid for sulfur dioxide absorption, is characterized in that described solution is comprised of the aqueous solution of tartrate and amino-acid salt, and described tartrate is 1:(0.5 ~ 2.8 with the mol ratio of mixing of amino-acid salt).
2. the salting liquid of the composite organic acid for sulfur dioxide absorption according to claim 1 is characterized in that: the mixture that described amino-acid salt is any one or two kinds in Beta-alanine salt or glycinate.
3. the salting liquid of the composite organic acid for sulfur dioxide absorption according to claim 2, it is characterized in that: described amino-acid salt is sodium salt or sylvite.
4. the salting liquid of the composite organic acid for sulfur dioxide absorption according to claim 1, it is characterized in that: described tartrate is sodium tartrate or potassium tartrate.
5. the salting liquid of the composite organic acid for sulfur dioxide absorption according to claim 2, it is characterized in that: the aqueous solution that the described acylate aqueous solution is sodium tartrate and Beta-alanine sodium, be perhaps the aqueous solution of sodium tartrate and Beta-alanine potassium, be perhaps the aqueous solution of potassium tartrate and Beta-alanine sodium, be perhaps the aqueous solution of potassium tartrate and Beta-alanine sodium, be perhaps the aqueous solution of sodium tartrate and Sodium Glycinate, be perhaps the aqueous solution of sodium tartrate and glycine potassium, be perhaps the aqueous solution of potassium tartrate and Sodium Glycinate, be perhaps the aqueous solution of potassium tartrate and glycine potassium.
6. according to the described salting liquid of the composite organic acid for sulfur dioxide absorption of any one in claim 1 to 5, it is characterized in that: the total concentration of described acylate aqueous solution mesotartrate and amino-acid salt is 0.1 ~ 3.0mol/L.
7. the salting liquid of the composite organic acid for sulfur dioxide absorption according to claim 6, it is characterized in that: the total concentration of described acylate aqueous solution mesotartrate and amino-acid salt is 0.5~2.0mol/L.
8. the salting liquid of the composite organic acid for sulfur dioxide absorption according to claim 1, it is characterized in that: described tartrate and amino-acid salt mol ratio are 1:(1~1.8).
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111189970A (en) * 2018-11-14 2020-05-22 中国石油化工股份有限公司 Method for detecting absorption and elimination performance of hydrogen sulfide

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0851871A (en) * 1994-08-10 1996-02-27 Toyo Polymer Kk Embossed fluororesin film for green house
CN1298754A (en) * 2000-10-16 2001-06-13 中国石油化工集团公司 Wet process for removing SO2 from fume
US20060117954A1 (en) * 2002-05-08 2006-06-08 Nederlandse Organisatie Voortoegepastnatenschappel Ijk Onderzoek Tno Method for absorption of acid gases
CN1895738A (en) * 2005-07-12 2007-01-17 南京理工大学 Composite solution for membrane contactor to absorb acid gas
US20100186590A1 (en) * 2009-01-29 2010-07-29 Basf Se Absorption medium for removing acid gases which comprises amino acid and acid promoter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0851871A (en) * 1994-08-10 1996-02-27 Toyo Polymer Kk Embossed fluororesin film for green house
CN1298754A (en) * 2000-10-16 2001-06-13 中国石油化工集团公司 Wet process for removing SO2 from fume
US20060117954A1 (en) * 2002-05-08 2006-06-08 Nederlandse Organisatie Voortoegepastnatenschappel Ijk Onderzoek Tno Method for absorption of acid gases
CN1895738A (en) * 2005-07-12 2007-01-17 南京理工大学 Composite solution for membrane contactor to absorb acid gas
US20100186590A1 (en) * 2009-01-29 2010-07-29 Basf Se Absorption medium for removing acid gases which comprises amino acid and acid promoter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111189970A (en) * 2018-11-14 2020-05-22 中国石油化工股份有限公司 Method for detecting absorption and elimination performance of hydrogen sulfide

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