CN103157363A - Novel method of high-efficient deamination - Google Patents

Abstract

The invention relates to a novel method of high-efficient deamination. The method comprises steps of: removing ammonia gas, regenerating a Fe-based ionic liquid, adding concentrated phosphoric acid into the Fe-based ionic liquid absorbing the ammonia gas, and recycling the Fe-based ionic liquid and the concentrated phosphoric acid. The method provided by the invention is high in deamination efficiency, simple in process, and easy to couple with desulphurization, anhydrous ammonia and other technologies; and the method is a novel green deamination process, and suitable for coke oven gas, petrochemical and other deamination fields with various production scales.

Description

Efficient deamination new method

Technical field

The present invention relates to deamination method, be specifically related to a kind of deamination new method take iron-based ionic liquid as absorbent.

Background technology

Ammonia is a kind of gas of penetrating odor, in a lot of chemical process such as coking industry, the capital has a large amount of ammonias to produce, because ammonia has the heavy corrosion effect to production equipment and pipeline, the nitrogen oxide that produces after ammonia-containing water and burning can produce severe contamination to environment, ammonia in coke-stove gas also can have a strong impact on the washing oil quality that absorbs crude benzol in coal gas, and ammonia can be used for making chemical fertilizer or industrial chemicals, therefore must carry out absorbing early stage conversion processing and recycle, just can satisfy the requirement that green chemical industry is produced.

At present, the main deamination technique of coking industry has: concentrated ammonia liquor technique, production ammonium sulfate process, production anhydrous ammonia technique, ammonia decomposition and burning process, by-product agricultural ammonium bicarbonate new technology etc.But said method has deficiency separately, for example, concentrated ammonia liquor process equipment seriously corroded, poor product quality, technical process can cause environmental pollution, seldom is used at present; Producing thiamine process is the conventional method that in coke-stove gas, ammonia reclaims, assimilation effect is relatively good, generates the easy storage and transport of solid product, environmentally safe, but from the economic point of view analysis, its fatal shortcoming is the income that reclaims the sulphur ammonium its producing cost of payment that is nowhere near; The anhydrous ammonia production method is mainly to use not Pehanorm method production anhydrous ammonia, its ammonia recovery is high, automaticity is high, environmental protection, but because medium has certain corrosivity, and desorb, distillation operation require to carry out under higher pressure, therefore equipment material is had relatively high expectations, accumulating is inconvenient, and it is larger that the economy of this technique is affected by production scale, when scale is too small, both uneconomical not easy to operate yet; Ammonia decomposes with burning process economical and practical, but restricted application, steam consumption is large, has also increased steam condensate waste water simultaneously; By-product agricultural ammonium bicarbonate new technology is with low cost, and safety and environmental protection is at present still among research.

Ionic liquid is a kind of functional green solvent, has a lot of good physicochemical properties, as: liquid journey wide ranges, solubility property is good, almost there is no vapour pressure, and is non-volatile, is difficult for loss and contaminated environment in use and storage; Can be recycled, meet the requirement of environmental protection; Heat endurance and chemical stability are preferably arranged.Wherein iron-based ionic liquid preparation is simple, and viscosity is less, have simultaneously Lewis acid and

The characteristic of acid shows good heat endurance, paramagnetism and very strong hydrophobic property, is widely used in catalyzing and synthesizing, the aspect such as pollutant control, has broad application prospects in industrial production greenization process.

Yujiang County etc. have proposed to build take iron-based ionic liquid as desulfurizing agent the new desulfurization process of non-aqueous phase wet oxidation of hydrogen sulfide in Chinese patent application CN200910092486.5.

Summary of the invention

The inventor finds through research, iron-based ionic liquid can effectively absorb ammonia, after the gas that will contain ammonia passes into wherein, ammonia can be absorbed and remove, absorb iron-based ionic liquid after ammonia processes by SPA renewable, recycling afterwards, thereby complete the present invention.

The purpose of this invention is to provide a kind of efficient deamination method, the method comprises the following steps:

(1) remove ammonia: the gas of wanting to remove ammonia is passed in iron-based ionic liquid, by iron-based Ions Absorption ammonia, the gas that removes after ammonia is discharged;

(2) iron-based ionic liquid regeneration: add SPA in the iron-based ionic liquid that absorbs ammonia;

(3) iron-based ionic liquid and SPA is recycling: the solution layering, and after separation, the upper strata iron-based ionic liquid removes agent as ammonia and is reused in step (1), and the phosphoric acid of lower floor is used for step (2) as regenerative agent.

Another object of the present invention is to provide a kind of efficient deamination method, the method is further comprising the steps of before in step (1):

The preparation of (1 ') iron-based ionic liquid: chlorination alkyl imidazole, kelene yl pyridines or alkyl amine hydrochloride and ferric trichloride fully are mixed with iron-based ionic liquid.

It is high that the method according to this invention, iron-based ionic liquid are inhaled ammonia efficient, passes into be easy to regenerate after phosphoric acid and be easy to that it separates with phosphoric acid.In addition, because iron-based ionic liquid is lyophobic dust, inhale the equal moisture-free of ionic liquid of ammonia front and back, reduced because steam is introduced the energy consumption that makes the phosphoric acid dilution increase subsequent production anhydrous ammonia technique, and than directly adopting phosphoric acid deamination phosphoric acid amount used to lack.The method technical process is simple, can determine flexibly later stage recovery ammonia scheme after effectively removing ammonia according to different production scales.But the method efficient absorption ammonia does not produce secondary pollution simultaneously, and is environmentally friendly.

Method deamination efficient provided by the invention is high, and technical process is simple, with the technique coupling such as anhydrous ammonia, is easily a kind of novel green deamination technique, is applicable to much different production-scale deaminations fields such as coke-stove gas, petrochemical industry.

Description of drawings

Fig. 1 shows the iron-based ionic liquid of preferably implementing according to the present invention and removes the ammonia artwork;

Wherein, 1-ammonia generation device; 2-inhales ammonia reactor; The 3-mixing arrangement; The 4-separator; The 5-flange; 6-glass sand filter tunnel; The 7-concentrated ammonia liquor; The 8-iron-based ionic liquid; 9-tail gas absorption bottle; The 10-peristaltic pump.

Fig. 2 illustrates the infrared spectrogram of suction ammonia front and back ionic liquid in embodiment 2.

Fig. 3 illustrates the ultraviolet-visible light spectrogram of ionic liquid before and after suction ammonia after the dilution of methyl alcohol in embodiment 2.

Fig. 4 illustrates in embodiment 2 infrared spectrogram of iron-based ionic liquid after holomorphosis.

Fig. 5 illustrates the ultraviolet-visible light spectrogram that ionic liquid after ammonia is inhaled in the regeneration of variable concentrations phosphoric acid in embodiment 3.

Fig. 6 illustrates the ultraviolet-visible light spectrogram of phosphoric acid regeneration suction ammonium ion liquid different time in embodiment 4.

The specific embodiment

Below in conjunction with accompanying drawing, by the present invention is described in detail according to figure embodiment.The features and advantages of the invention will become more explicit along with these explanations.

In literary composition, term used " iron-based ionic liquid " can be by formula [R-C ₃H ₃N ₂-R '] FeCl ₄, [C ₅H ₅N-R ₄] FeCl ₄Or [R ₁R ₂R ₃NH] FeCl ₄Expression, wherein R, R ', R ₁, R ₂, R ₃, and R ₄Be alkyl independently of one another, preferred carbon number is C ₁-C ₁₂Alkyl, such as methyl, ethyl, butyl, hexyl, octyl group and dodecyl etc.。

In other words, iron-based ionic liquid refers to the iron-based ionic liquid that formed by chlorination alkyl imidazole, kelene yl pyridines or alkyl amine hydrochloride and ferric trichloride, wherein chlorination alkyl imidazole, kelene yl pyridines refer to that imidazoles, pyridine are by the alkyl-modified imidazole derivative that obtains of chlorination, imidazoles is selected from N-methylimidazole, N-ethyl imidazol(e) and N-butyl imidazole, and chlorination is alkyl-modified refers to that the alkyl chloride such as chloro-butane, chloro-hexane, chloro octane or chlorinated dodecane and imidazoles or pyridine bonding form corresponding derivative.

As the example of iron-based ionic liquid, can mention C ₄H ₉-C ₃H ₃N ₂-CH ₃] FeCl ₄, [C ₆H ₁₃-C ₃H ₃N ₂-CH ₃] FeCl ₄, [C ₈H ₁₇-C ₃H ₃N ₂-CH ₃] FeCl ₄, [C ₁₂H ₂₅-C ₃H ₃N ₂-CH ₃] FeCl ₄, [C ₄H ₉-C ₃H ₃N ₂-C ₂H ₅] FeCl ₄, [C ₆H ₁₃-C ₃H ₃N ₂-C ₂H ₅] FeCl ₄, [C ₈H ₁₇-C ₃H ₃N ₂-C ₂H ₅] FeCl ₄, [C ₁₂H ₂₅-C ₃H ₃N ₂-C ₂H ₅] FeCl ₄, [C ₄H ₉-C ₃H ₃N ₂-C ₄H ₉] FeCl ₄, [C ₆H ₁₃-C ₃H ₃N ₂-C ₄H ₉] FeCl ₄, [C ₈H ₁₇-C ₃H ₃N ₂-C ₄H ₉] FeCl ₄, [C ₁₂H ₂₅-C ₃H ₃N ₂-C ₄H ₉] FeCl ₄, [C ₅H ₅N-C ₄H ₉] FeCl ₄, [C ₅H ₅N-C ₆H ₁₃] FeCl ₄, [C ₅H ₅N-C ₈H ₁₇] FeCl ₄, [C ₅H ₅N-C ₁₂H ₂₅] FeCl ₄, and [C ₂H ₅C ₂H ₅C ₂H ₅NH] FeCl ₄Deng.

Described iron-based ionic liquid can fully mix with ferric trichloride by chlorination alkyl imidazole, kelene yl pyridines or alkyl amine hydrochloride and makes.

The synthetic method of iron-based ionic liquid is referring to for example (Chem, Let., Vol.33, P1590-1591,2004), be 1 with mol ratio: 1-4: 1 iron chloride and chlorination alkyl imidazole, kelene yl pyridines or alkyl amine hydrochloride be abundant hybrid reaction in open natural environment, separates making iron-based ionic liquid by liquid-liquid or liquid-solid phase.

On the one hand, the invention provides a kind of efficient deamination method, the method comprises the following steps:

(1) remove ammonia: the gas of wanting to remove ammonia is passed in iron-based ionic liquid, by iron-based Ions Absorption ammonia, the gas that removes after ammonia is discharged;

(2) iron-based ionic liquid regeneration: add SPA in the iron-based ionic liquid that absorbs ammonia;

(3) iron-based ionic liquid and SPA is recycling: the solution layering, and after separation, the upper strata iron-based ionic liquid removes agent as ammonia and is reused in step (1), and the phosphoric acid of lower floor is used for step (2) as regenerative agent.

Wherein, in step (1), after the gas that will contain ammonia passed into iron-based ionic liquid, iron-based ionic liquid namely fully absorbed ammonia wherein.Test shows, iron-based ionic liquid absorbs the capacity of ammonia up to more than 1.5mol/L, and absorbent properties are good.

In step (1), when iron-based ionic liquid absorbs ammonia, because iron-based ionic liquid is hydrophobic, wherein do not contain water, it does not absorb moisture yet when absorbing ammonia, do not contain water after the absorption ammonia yet.

In step (1), the gas that is removed after ammonia can carry out post processing as required, as purifying some gas of removing wherein by gas cleaning plant, or absorbs by device for absorbing tail gas.

In step (2), it is SPA more than 70% that the phosphoric acid that is used for iron-based ionic liquid regeneration is preferably concentration.

In step (2), for iron-based ionic liquid regeneration, can use other inorganic acids such as concentrated hydrochloric acid etc., but low due to the regenerated capacity of other inorganic acids, have the problems such as volatile, that last handling process is complicated, preferably use SPA.

In step (2), be preferably more than 10 minutes by regenerate time of iron-based ionic liquid of SPA, at this moment between under, iron-based ionic liquid can holomorphosis.

In step (2), in regenerative process, the phosphoric acid consumption is more than 1/3 (mole) of institute's absorbing ammonia tolerance, to guarantee iron-based ionic liquid holomorphosis.

In step (3), after iron-based ionic liquid is regenerated by SPA, layering between iron-based ionic liquid after regeneration and unreacted phosphoric acid, due to iron-based ionic liquid be hydrophobic and its density large, it is in the upper strata, and unreacted phosphoric acid is in lower floor, can natural layering and then separation.In addition, because ionic liquid has paramagnetism, and phosphoric acid is namagnetic substance, also can pass through the magneticaction multi_layer extraction.

In step (3), the iron-based ionic liquid after regeneration can be used as the agent of ammonia absorbing and removing and is reused in step (1), and unreacted phosphoric acid can be used as regenerative agent and is reused in step (2).

In preferred embodiment, efficient deamination method according to the present invention comprises the following steps:

Step (1): iron-based ionic liquid is injected in reactor, and the gas that then will contain ammonia passes in iron-based ionic liquid;

Step (2): after iron-based ionic liquid absorbed ammonia, the regenerating unit with solution injects with peristaltic pump injected SPA simultaneously wherein;

Step (3): after fully mixing, solution is injected in separator, the solution layering, with recycling in the peristaltic pump injecting reactor, underclad portion solution adds fresh SPA and is back in regenerating unit recycling with the upper strata ionic liquid.

In further preferred embodiment, efficient deamination method according to the present invention comprises the following steps:

(1) remove ammonia: the gas of wanting to remove ammonia is passed into the suction amine reactor bottom that iron-based ionic liquid is housed, by iron-based Ions Absorption ammonia, the gas that removes after ammonia is discharged from inhaling the amine reactor top;

(2) iron-based ionic liquid regeneration: will absorb in the iron-based ionic liquid of ammonia from suction amine reactor bottom by feeding to mixing arrangement, and add wherein SPA from the mixing arrangement top, and carry out regenerative response;

(3) iron-based ionic liquid and SPA is recycling: the reaction solution after regenerating is from mixing arrangement bottom feeding to the separator bottom, the solution layering, after separation, the upper strata iron-based ionic liquid removes agent from separator top feeding to inhaling amine reactor top as ammonia, be reused in step (1), the unreacted phosphoric acid of lower floor, is reused in step (2) from separator bottom feeding to mixing arrangement top as regenerative agent.

The inventor infers that the mechanism of iron-based ionic liquid absorption ammonia may be as follows: iron-based ionic liquid and ammonia gas react, two hydrogen in the iron-based ionic liquid imidazole ring and ammonia form the ammonium root, after adding SPA, hydrogen in phosphoric acid replaces the ammonium root and forms iron-based ionic liquid, the ammonium root is combined with phosphate radical and is formed ammonium phosphate, ammonium phosphate be dissolved in phosphoric acid mutually in, thereby easily layered circulation utilization.

Need to prove, above-mentioned mechanism is only that the possibility of mechanism of the present invention is inferred, the invention is not restricted to above-mentioned mechanism.

Below further describe the present invention by exemplary example.

Embodiment 1

Step (1): as shown in Figure 1, reactor 2 is linked together with glass sand filter tunnel 6 with the glass tube reactor of oil bath wall by flange 5 and forms.Add iron-based ionic liquid 8 in reactor, ammonia is passed in reactor, the reaction temperature by iron-based ionic liquid in oil bath or water-bath regulation and control reactor begins to absorb ammonia after temperature constant.

Step (2): the iron-based ionic liquid in step (1) is passed in the regenerative response device, reaction unit is comprised of mixing arrangement (also referred to as regenerating unit) 3 and separation equipment 4, ionic liquid after separation refills to be inhaled in ammonia reactor 2, additional phosphoric acid rear section is recycling, and part is drawn according to actual conditions and can be coupled with other techniques.

Embodiment 2

With 1-butyl-3-methyl chloride for imidazoles (BmimCl) and Iron(III) chloride hexahydrate (FeCl ₃6H ₂O) be 1: 2 synthesis iron base ionic liquid in molar ratio for raw material, the 300mL ionic liquid is packed in reactor 2.Blast air under room temperature in 100mL ammoniacal liquor, obtain the gaseous mixture of ammonia and air, it is passed in the 300mL ionic liquid, fully stir.Tail gas is absorbed by 100mL 2% boric acid aqueous solution.

Respectively before ammonia passes into ionic liquid and pass into and get 2mL after ionic liquid and produce ammonia ammoniacal liquor used, with salt standard acid solution (C ₁=0.729mol/L) its concentration of titration, and get 20mL tail gas absorption liquid with salt standard acid solution (C ₂=0.058mol/L) the titration content of ammonia wherein, thus determine the ammonia amount that absorbed by ionic liquid, see the following form 1.

Table 1 ionic liquid is inhaled ammonia capacity titration table

The molal quantity of ionic liquid absorbing ammonia:

$n_{{\mathrm{NH}}_3}=(V_1-V_2)\×C_1\÷V_{{\mathrm{NH}}_3}^{/}\×V_{{\mathrm{NH}}_3}-V_3\×C_2\÷V_{H_3{\mathrm{BO}}_3}^{/}\×V_{H_3{\mathrm{BO}}_3}=0.466\mathrm{mol}$

The capacity of ionic liquid absorbing ammonia:

$C_{{\mathrm{NH}}_3}=n_{{\mathrm{NH}}_3}\÷V_{{\mathrm{IL}}_1}=1.553\mathrm{mol}/L$

Fig. 2 illustrates the infrared spectrogram of inhaling ionic liquid before and after ammonia.Compared to pure ionic liquid ICIL, after suction ammonia, ionic liquid is at 1400cm ^-1The place presents stronger spike, is the flexural vibrations of N-H; At 2800-3400cm ^-1Present wide and strong peak, be the stretching vibration of N-H.As seen the form of ammonia in ionic liquid is NH ₄ ⁺All there is no 3300cm in the infrared spectrum of ionic liquid before and after deamination ^-1And 1630cm ^-1Hydrone in-stretching vibration peak of OH, this has illustrated in the iron-based ionic liquid of inhaling after ammonia and has not contained moisture.Its result is consistent with moisture titrator measurement result, and ionic liquid does not absorb moisture in suction ammonia process.

Fig. 3 illustrates the ultraviolet-visible light spectrogram of ionic liquid before and after suction ammonia after methyl alcohol dilution.There is an acromion in parent ion liquid between 580～640nm, absworption peak for metallic iron and chlorine formation complex compound, and after deamination, ionic liquid has a stronger absworption peak near 600nm, can infer that the ammonia that passes into and two hydrogen of imidazole ring have an effect, make original conjugacy variation, blue shift has occured in absorption band.

The ionic liquid that absorbs ammonia is passed in regenerating unit 3, add wherein capacity phosphoric acid fully to mix, the liquid after holomorphosis is carried out IR Characterization, as shown in Figure 4.The infrared spectrum of regeneration of ionic liquid and pure ionic liquid is indifference almost, and deducibility goes out ionic liquid can pass through phosphoric acid holomorphosis.

Embodiment 3

Get respectively and inhale ionic liquid 20mL after ammonia, add that equal-volume (8mL) concentration is 0,0.48,0.71, the phosphoric acid of 1.30mol/L fully mixes rear separation and obtains upper solution, record the rear ionic liquid ultraviolet-visible spectrum of regeneration, and contrast with pure ionic liquid, as shown in Figure 5, determine the proportionate relationship of ammonia content in ionic liquid and the required phosphoric acid of regeneration.

Fig. 5 shows that it is 1.30mol/L that the optimum quantum of utilization of phosphoric acid should select 8mL concentration, is calculated as follows:

20mL inhales after ammonia that in ionic liquid, ammonia content is:

$n_{{\mathrm{NH}}_3}^{/}=V_{{\mathrm{IL}}_2}\×C_{{\mathrm{NH}}_3}=3.106\×{10}^{-2}\mathrm{mol}$

Minimum regeneration phosphoric acid amount is:

$n_{H_3{\mathrm{PO}}_4}=V_{H_3{\mathrm{PO}}_4}\×C_{H_3{\mathrm{PO}}_4}=1.04\×{10}^{-2}\mathrm{mol}$

At this moment, ammonia content and phosphoric acid ratio (mol ratio) are: 3: 1.Can infer that regenerative process meets following quantitative relationship:

${3\mathrm{NH}}_4^{+}+H_3{\mathrm{PO}}_4={\left({\mathrm{NH}}_4\right)}_3{\mathrm{PO}}_4+{3H}^{+}$

Embodiment 4

Get respectively ionic liquid 20mL after deamination, add 8mL 1.30mol/L phosphoric acid, separate the upper strata regeneration of ionic liquid fully mix 8min, 9min, 10min in mixing arrangement after, measure its ultraviolet-visible spectrum, and contrast with pure ionic liquid, as shown in Figure 6, determine the shortest recovery time that regeneration is required.

Fig. 6 shows that adding 8mL 1.30mol/L phosphoric acid required shortest time of 20mL deamination ionic liquid of just regenerating is 10min.

The method according to this invention, iron-based ionic liquid have acidity and hydrophobicity; Iron-based ionic liquid middle-jiao yang, function of the spleen and stomach ion pair ammonia has stronger absorption, can realize rapidly and efficiently removing of ammonia.

The inventive method and traditional not Pehanorm method have all adopted phosphoric acid, and by contrast, advantage and disadvantage of the present invention is: it is high that iron-based ionic liquid absorbs ammonia efficient, its saturated vapor forces down, and when this technique can prevent from adopting phosphoric acid, high-temperature gas makes absorption liquid reach vapor liquid equilibrium and affects absorption; Because iron-based ionic liquid has good hydrophobic performance, inhale the equal moisture-free of ionic liquid of ammonia front and back, reduced steam impact and the steam of subsequent technique have been introduced the energy consumption that makes the phosphoric acid dilution and increase subsequent production anhydrous ammonia technique; Probe into according to reaction mechanism, in regenerative process, phosphoric acid and absorbing ammonia tolerance ratio are 1: 3, and the phosphoric acid utilization rate is the highest, and use amount is few; This technical process is simple, can determine flexibly later stage recovery ammonia scheme according to the production scale of different enterprises after effectively removing ammonia.

Abovely by the specific embodiment and exemplary example, the present invention is had been described in detail, but these explanations are only illustrative, protection scope of the present invention are not consisted of any restriction.In the situation that do not depart from the present invention's spirit and protection domain, those skilled in the art can carry out multiple improvement, the of equal value replacement or modification to the present invention and embodiment thereof, and these all should fall within the scope of protection of the present invention.

All documents of mentioning in literary composition, incorporated herein by reference in full with it.

Claims (10)

1. efficient deamination method, the method comprises the following steps:

(1) remove ammonia: the gas of wanting to remove ammonia is passed in iron-based ionic liquid, absorb ammonia by iron-based ionic liquid, the gas that removes after ammonia is discharged;

(2) iron-based ionic liquid regeneration: add SPA in the iron-based ionic liquid that absorbs ammonia;

(3) iron-based ionic liquid and SPA is recycling: the solution layering, and after separation, the upper strata iron-based ionic liquid removes agent as ammonia and is reused in step (1), and the phosphoric acid of lower floor is used for step (2) as regenerative agent.

2. method according to claim 1, the method comprises the following steps:

Step (1): iron-based ionic liquid is injected in reactor, and the gas that then will contain ammonia passes in iron-based ionic liquid;

Step (2): after iron-based ionic liquid absorbs ammonia, solution is injected regenerating unit with peristaltic pump, inject wherein SPA simultaneously;

Step (3): after fully mixing, solution is injected in separator, the solution layering, with recycling in the peristaltic pump injecting reactor, underclad portion solution adds fresh SPA and is back in regenerating unit recycling with the upper strata ionic liquid.

3. method according to claim 1, the method comprises the following steps:

(1) remove ammonia: the gas of wanting to remove ammonia is passed into the suction amine reactor bottom that iron-based ionic liquid is housed, by iron-based Ions Absorption ammonia, the gas that removes after ammonia is discharged from inhaling the amine reactor top;

(2) iron-based ionic liquid regeneration: the iron-based ionic liquid that will absorb ammonia to mixing arrangement, and adds SPA from the mixing arrangement top from the bottom feeding of suction amine reactor wherein, carries out regenerative response;

(3) iron-based ionic liquid and SPA is recycling: the reaction solution after regenerating is from mixing arrangement bottom feeding to the separator bottom, the solution layering, after separation, the upper strata iron-based ionic liquid removes agent from separator top feeding to inhaling amine reactor top as ammonia, be reused in step (1), the unreacted phosphoric acid of lower floor, is reused in step (2) from separator bottom feeding to mixing arrangement top as regenerative agent.

4. the described method of any one according to claim 1-3, the method is further comprising the steps of before in step (1):

The preparation of (1 ') iron-based ionic liquid: chlorination alkyl imidazole, kelene yl pyridines or alkyl amine hydrochloride and ferric trichloride fully are mixed with iron-based ionic liquid, wherein chlorination alkyl imidazole, kelene yl pyridines refer to that imidazoles, pyridine are by the alkyl-modified imidazoles that obtains of chlorination or pyridine derivatives, imidazoles is selected from N-methylimidazole, N-ethyl imidazol(e) and N-butyl imidazole, and chlorination is alkyl-modified refers to that the alkyl chloride such as chloro-butane, chloro-hexane, chloro octane or chlorinated dodecane and imidazoles or pyridine bonding form corresponding derivative.

5. method according to claim 1, wherein, iron-based ionic liquid is by formula [R-C ₃H ₃N ₂-R '] FeCl ₄, [C ₅H ₅N-R ₄] FeCl ₄Or [R ₁R ₂R ₃NH] FeCl ₄Expression, wherein R, R ', R ₁, R ₂, R ₃, R ₄Be alkyl, preferred C ₁-C ₁₂Alkyl, [C for example ₄H ₉-C ₃H ₃N ₂-CH ₃] FeCl ₄, other also can be [C ₆H ₁₃-C ₃H ₃N ₂-CH ₃] FeCl ₄, [C ₈H ₁₇-C ₃H ₃N ₂-CH ₃] FeCl ₄, [C ₁₂H ₂₅-C ₃H ₃N ₂-CH ₃] FeCl ₄, [C ₄H ₉-C ₃H ₃N ₂-C ₂H ₅] FeCl ₄, [C ₆H ₁₃-C ₃H ₃N ₂-C ₂H ₅] FeCl ₄, [C ₈H ₁₇-C ₃H ₃N ₂-C ₂H ₅] FeCl ₄, [C ₁₂H ₂₅-C ₃H ₃N ₂-C ₂H ₅] FeCl ₄, [C ₄H ₉-C ₃H ₃N ₂-C ₄H ₉] FeCl ₄, [C ₆H ₁₃-C ₃H ₃N ₂-C ₄H ₉] FeCl ₄, [C ₈H ₁₇-C ₃H ₃N ₂-C ₄H ₉] FeCl ₄, [C ₁₂H ₂₅-C ₃H ₃N ₂-C ₄H ₉] FeCl ₄, [C ₅H ₅N-C ₄H ₉] FeCl ₄, [C ₅H ₅N-C ₆H ₁₃] FeCl ₄, [C ₅H ₅N-C ₈H ₁₇] FeCl ₄, [C ₅H ₅N-C ₁₂H ₂₅] FeCl ₄, [C ₂H ₅C ₂H ₅C ₂H ₅NH] FeCl ₄Deng.

6. the described method of any one according to claim 1-5, wherein, in step (2), the phosphoric acid that is used for iron-based ionic liquid regeneration is that concentration is the SPA more than 70%.

7. the described method of any one according to claim 1-6, wherein, in step (2), by regenerate time of iron-based ionic liquid of SPA be more than 10 minutes.

8. the described method of any one according to claim 1-7, wherein, in step (2), in regenerative process, the phosphoric acid consumption is more than 1/3 (mole) of institute's absorbing ammonia tolerance.

9. the described method of any one according to claim 1-8, wherein, in step (3), the iron-based sheath is with phosphoric acid layer natural layering and then separate, and perhaps iron-based sheath and phosphoric acid layer are by the magneticaction multi_layer extraction.

10. in claim 1-9, the described method of any one is used for removing of coke-stove gas ammonia, perhaps is used for removing of petroleum chemical industry ammonia in gas.

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