CN103143250A - Method for absorbing iodine during tar pyrolysis - Google Patents
Method for absorbing iodine during tar pyrolysis Download PDFInfo
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- CN103143250A CN103143250A CN201310105907XA CN201310105907A CN103143250A CN 103143250 A CN103143250 A CN 103143250A CN 201310105907X A CN201310105907X A CN 201310105907XA CN 201310105907 A CN201310105907 A CN 201310105907A CN 103143250 A CN103143250 A CN 103143250A
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- iodine
- waste gas
- pyrolysis
- tar
- absorbing
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Abstract
The invention discloses a method for absorbing iodine during tar pyrolysis. The method comprises the following steps of: putting viscous tar liquid containing a rhodium catalyst in a pyrolysis vessel, burning pyrolyzed iodine-containing waste gas, spraying iodine absorbing liquid, mixing and reacting the iodine absorbing liquid with the iodine-containing waste gas, and absorbing elemental iodine in the iodine-containing waste gas, wherein the iodine absorbing liquid comprises sodium thiosulfate and sodium hydroxide. Through the way, the method for absorbing iodine during tar pyrolysis has the advantages that during high-temperature pyrolysis, the viscous tar liquid containing the rhodium catalyst can be subjected to pyrolysis so as to produce free iodine, and the iodine absorbing liquid can fully absorb the elemental iodine, so that the generation of purple smoke caused by the fact that iodine waste gas is discharged to the air is prevented, and the pollution to the environment is reduced; and meanwhile, the method is simple to operate, and the cost of industrial production can be effectively saved.
Description
Technical field
The present invention relates to technical field of waste gas treatment, particularly relate to a kind of method that absorbs iodine in pyrolytic tar process.
Background technology
Carbongl group synthesis reaction is the important homogeneous complex catalysis reaction of a class, and various transition-metal-carbonyl complex compounds all have catalytic action to hydroformylation reaction, but only have the carbonyl complex of cobalt and rhodium to can be used in suitability for industrialized production.The catalytic activity of rhodium carbonyl catalyst in olefin carbonylation is active higher by 10 than cobalt carbonyl catalyst
2~ 10
4Doubly, and reaction condition is gentle, and the positive isomery ratio of product meets the industrialization demand.As the rhodium of VIII family noble metal, because of its costliness and catalytic activity high, need to it be carried out high efficiente callback and recycling in suitability for industrialized production, could embody the economic worth of rhodium catalyst.Rhodium catalyst recovery method commonly used generally is divided into the several different methods such as solvent extraction, ion-exchange, the precipitation method, extraction-chromatography, ion-exchange-chromatography, carbon fiber electrodeposition method, pressurized hydrogen reducing process and firing method at present.
The synthetic preparation of carbonyl aceticanhydride is under the condition that the rhodium homogeneous catalyst exists, and methyl acetate mixes afterwards solution and carbon monoxide to carry out carbonylation and prepare aceticanhydride and acetic acid with iodomethane.In this process, because carbonylation is to carry out under high temperature and high pressure, equipment is after operation a period of time, the coking of reactor mother liquor generates multiple unsaturated compound and then generation macromolecular compound tar, these tar can wrap up homogeneous rhodium catalyst also and the iodate rhodium polymerization that in reaction system, iodide form, and produce the tar viscous fluid of rhodium-containing catalyst, thereby cause rhodium homogeneous catalyst inactivation, therefore need to reclaim rhodium catalyst, make it recycle to reduce production costs.The tar viscous fluid viscosity of this rhodium-containing catalyst is large, during pyrolysis in viscous fluid iodine easily volatilize, and be difficult for by common alkali liquor absorption or by charcoal absorption, free-iodine can directly be discharged in atmosphere, cause environmental pollution, also can reclaim iodine and iodide simultaneously, improve production cost.The tar viscous fluid of rhodium-containing catalyst can be mixed with lower fatty acid, then distill to reclaim iodide, but the method need to be used more organic solvent, can cause secondary pollution to environment.Also can heat the mixture that is formed by rhodium, tar and methyl iodide under 120 ~ 180 ℃, rhodium is filtered out from tar and methyl iodide, but need further to separate as the tar of organic phase and the mixture of methyl iodide.Be no matter that extraction, decompression distillation or firing method reclaim Noble Metal Rhodium, iodine may dissociate out in this process, causes environmental pollution, however in existing public technology there are no solution.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of method that absorbs iodine in pyrolytic tar process, and the method can reduce waste gas to the pollution of environment.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of method that absorbs iodine in pyrolytic tar process is provided, comprise that step is: the tar viscous fluid that will contain rhodium catalyst is placed in pyrolysis container, the combustion heat solves and contains iodine waste gas, iodine absorption liquid spray mixes and reacts with the described iodine waste gas that contains, the described iodine that contains in iodine waste gas is absorbed, and wherein said iodine absorption liquid comprises sodium thiosulfate and NaOH.
In a preferred embodiment of the present invention, described pyrolysis container is pallet.
In a preferred embodiment of the present invention, described iodine absorption liquid is to be mixed to get by sodium hydroxide solution and sodium thiosulfate that mass percent is 5-45%.
In a preferred embodiment of the present invention, described in described iodine absorption liquid, the mass ratio of sodium thiosulfate and described NaOH is 1-50:1.
The invention has the beneficial effects as follows: the method that absorbs iodine in pyrolytic tar process of the present invention, the method is in the high temperature pyrolysis process, the tar viscous fluid of rhodium-containing catalyst can pyrolysis produce free-iodine, the iodine absorption liquid can fully absorb elemental iodine, prevent that the iodine toxic emission from forming purple cigarette in air, reduced the pollution to environment, the method is simple to operate simultaneously, can effectively save the industrial production cost.
The specific embodiment
The below is described in detail preferred embodiment of the present invention, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made more explicit defining.
Embodiment one:
The tar viscous fluid that will contain rhodium catalyst is placed in pallet, pallet is put into combustion furnace to burn, pyrolysis goes out contains iodine waste gas and enters in the iodine absorption tower through dual firing chamber, put into the iodine absorption liquid in the iodine absorption tower, described iodine absorption liquid is mixed to get by sodium hydroxide solution and sodium thiosulfate, the mass ratio of wherein said sodium thiosulfate and described NaOH is 1:1, by spray pump, described iodine absorption liquid is transported to the top on described iodine absorption tower, mix and react with the described iodine waste gas that contains through shower nozzle spray, reaction principle is:
Na
2S
2O
3+ 4I
2+ 10NaOH=2Na
2SO
4+ 8NaI+5H
2O or
Na
2S
2O
3+ Na
2SO
3+ I
2=Na
2S
2O
6+ 2NaI, the described iodine that contains in iodine waste gas are absorbed into and are inorganic salt compounded of iodine, do not discharge contaminated environment with waste gas.
Embodiment two:
the tar viscous fluid that will contain rhodium catalyst is placed in pallet, pallet is put into combustion furnace to burn, pyrolysis goes out contains iodine waste gas and enters in the iodine absorption tower through dual firing chamber, put into the iodine absorption liquid in the iodine absorption tower, described iodine absorption liquid is mixed to get by sodium hydroxide solution and sodium thiosulfate, the mass ratio of wherein said sodium thiosulfate and described NaOH is 30:1, by spray pump, described iodine absorption liquid is transported to the top on described iodine absorption tower, mix and react with the described iodine waste gas that contains through shower nozzle spray, the described iodine that contains in iodine waste gas is absorbed into and is inorganic salt compounded of iodine, do not discharge contaminated environment with waste gas.
Embodiment three:
the tar viscous fluid that will contain rhodium catalyst is placed in pallet, pallet is put into combustion furnace to burn, pyrolysis goes out contains iodine waste gas and enters in the iodine absorption tower through dual firing chamber, put into the iodine absorption liquid in the iodine absorption tower, described iodine absorption liquid is mixed to get by sodium hydroxide solution and sodium thiosulfate, the mass ratio of wherein said sodium thiosulfate and described NaOH is 50:1, by spray pump, described iodine absorption liquid is transported to the top on described iodine absorption tower, mix and react with the described iodine waste gas that contains through shower nozzle spray, the described iodine that contains in iodine waste gas is absorbed into and is inorganic salt compounded of iodine, do not discharge contaminated environment with waste gas.
Absorb the method for iodine in the pyrolytic tar process that the present invention discloses, the method is in the high temperature pyrolysis process, the tar viscous fluid of rhodium-containing catalyst can pyrolysis produce free-iodine, the iodine absorption liquid can fully absorb elemental iodine, prevent that the iodine toxic emission from forming purple cigarette in air, reduced the pollution to environment, the method is simple to operate simultaneously, can effectively save the industrial production cost.
The above is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention to do, or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (4)
1. absorb the method for iodine in a pyrolytic tar process, it is characterized in that, comprise that step is: the tar viscous fluid that will contain rhodium catalyst is placed in pyrolysis container, the combustion heat solves contains iodine waste gas, iodine absorption liquid spray mixes and reacts with the described iodine waste gas that contains, the described iodine that contains in iodine waste gas is absorbed, and wherein said iodine absorption liquid comprises sodium thiosulfate and NaOH.
2. the method for absorption iodine according to claim 1, is characterized in that, described pyrolysis container is pallet.
3. the method for absorption iodine according to claim 1, is characterized in that, described iodine absorption liquid is to be mixed to get by sodium hydroxide solution and sodium thiosulfate that mass percent is 5-45%.
4. the method for absorption iodine according to claim 3, is characterized in that, described in described iodine absorption liquid, the mass ratio of sodium thiosulfate and described NaOH is 1-50:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310105907XA CN103143250A (en) | 2013-03-29 | 2013-03-29 | Method for absorbing iodine during tar pyrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310105907XA CN103143250A (en) | 2013-03-29 | 2013-03-29 | Method for absorbing iodine during tar pyrolysis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103143250A true CN103143250A (en) | 2013-06-12 |
Family
ID=48541726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310105907XA Pending CN103143250A (en) | 2013-03-29 | 2013-03-29 | Method for absorbing iodine during tar pyrolysis |
Country Status (1)
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|---|---|
| CN (1) | CN103143250A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87100396A (en) * | 1986-01-21 | 1987-09-02 | 伊斯曼柯达公司 | Catalyst recovery method |
| CN101757956A (en) * | 2010-01-22 | 2010-06-30 | 安徽皖维高新材料股份有限公司 | Method for recovering rhodium catalyst from catalyst-tar solution |
| US20100303708A1 (en) * | 2008-01-31 | 2010-12-02 | Nippoh Chemicals Co., Ltd. | Inorganic iodide, production method thereof, and production system thereof |
-
2013
- 2013-03-29 CN CN201310105907XA patent/CN103143250A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87100396A (en) * | 1986-01-21 | 1987-09-02 | 伊斯曼柯达公司 | Catalyst recovery method |
| US20100303708A1 (en) * | 2008-01-31 | 2010-12-02 | Nippoh Chemicals Co., Ltd. | Inorganic iodide, production method thereof, and production system thereof |
| CN101757956A (en) * | 2010-01-22 | 2010-06-30 | 安徽皖维高新材料股份有限公司 | Method for recovering rhodium catalyst from catalyst-tar solution |
Non-Patent Citations (1)
| Title |
|---|
| MAJID ALI ET AL.: "Study of iodine removal efficiency in self-priming venturi scruber", 《ANNALS OF NUCLEAR ENERGY》 * |
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Application publication date: 20130612 |