CN202936329U - Device for recycling methyl iodide in low pressure tail gas in acetic acid production under low load - Google Patents
Device for recycling methyl iodide in low pressure tail gas in acetic acid production under low load Download PDFInfo
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- CN202936329U CN202936329U CN201220630349XU CN201220630349U CN202936329U CN 202936329 U CN202936329 U CN 202936329U CN 201220630349X U CN201220630349X U CN 201220630349XU CN 201220630349 U CN201220630349 U CN 201220630349U CN 202936329 U CN202936329 U CN 202936329U
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- low pressure
- pipeline
- methyl alcohol
- regenerator column
- tower
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Abstract
The utility model discloses a device for recycling methyl iodide in a low pressure tail gas in acetic acid production under a low load. The device comprises a low pressure absorbing tower, wherein a liquid inlet of the low pressure absorbing tower is connected with a liquid outlet of a regenerating tower bottom and a liquid outlet end of a liquid inlet pipeline is communicated with a methanol liquid inlet of the low pressure absorbing tower; a tower bottom liquid outlet of the low pressure absorbing tower is connected with a liquid inlet of an absorbed methanol storage tank; one gas phase inlet of the low pressure absorbing tower is communicated with the absorbed methanol storage tank and the other gas phase inlet of the low pressure absorbing tower is connected with a gas outlet pipeline of a final cooler; a regenerating tower condenser is communicated with a gas balancing pipeline; a liquid outlet of the regenerating tower condenser is communicated with a liquid pipeline; a liquid outlet of the absorbed methanol storage tank is connected with a liquid outlet pipeline; a branch pipe of the liquid outlet pipeline is connected with a reactor; and the other branch pipe of the liquid outlet pipeline is connected with a material inlet of a regenerating tower. Through adoption of the device disclosed by the utility model, the ratio of a heavy phase is increased and iodine balance of the system is guaranteed.
Description
Technical field
The utility model relates under underload the device that a kind of recovery in acetic acid production contains the methyl iodide low-pressure tail gas.
Background technology
In acetic acid production, methyl iodide is as promotor, and the speed of speed of response is played a role.Be to reclaim the methyl iodide in low-pressure tail gas, adopt in the low pressure absorption tower to absorb with methyl alcohol.Lower than 35% the time, reactor can not digest in time that the low pressure absorption tower produces contains methyl iodide methyl alcohol rich solution at driving initial stage or load, causes easily that to contain the methyl iodide methanol solution too much, and the methyl iodide volatilization enters torch with tail gas, causes the loss of environmental pollution and iodine.As shown in Figure 1, to absorb the absorption methanol solution in methyl alcohol basin 5 this moment, with regenerator column methanol feed pump 6, join regenerator column 1 middle part, through regenerator column reboiler 2 heating, vaporization, tower reactor obtains the higher methyl alcohol of purity, enters methyl alcohol lean solution tank 15 after cooling by lean solution water cooler 14, deliver to low pressure absorption tower 4 and recycle by absorbing methyl alcohol take away pump 7 parts again, a part is returned to reactor; Overhead vapours obtains the mixture that forms near the azeotropic of methyl iodide and methyl alcohol after 3 condensations of regenerator column condenser, a part is back to the regenerator column top, and a part is delivered to the quantizer 11 of lightness-removing column 8.Lightness-removing column 8 is mainly that by condenser of light component removal column 10 condensations, liquid enters quantizer 11 with light constituents such as the methyl iodide in thick acetic acid, non-condensable gases through lightness-removing column reboiler 9 heating, and gas is cooling by low pressure absorption tower 4 through whole cooler 12.Quantizer 11 lower liquid (be mainly methyl iodide, be designated hereinafter simply as heavy phase) turn back to reactor by heavy phase pump 13, guarantee the equilibrium iodine of system; The non-condensable gas of regenerator column condenser turns back to freezing water-cooled whole cooler 12, and gas phase absorbs with methyl alcohol through entering the low pressure absorption tower, and liquid phase also turns back to quantizer 11.In process of production, contain methyl alcohol in vapour phase due to regenerator column 1 tower top, enter quantizer 11 and generate ritalin, cause the methyl iodide in quantizer 11 poor with thick acetic acid layered effect, heavy phase proportion reduces (below 1.80), heavy phase pump 13 can not in time send back to reactor with heavy phase, thereby destroys the balance of whole system iodine, and reaction process worsens.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming of prior art, provides a kind of and be beneficial to operation, do not affect quantizer layered effect and heavy phase proportion, guarantees to reclaim under a kind of underload of system's equilibrium iodine the device of methyl iodide in acetic acid production mesolow tail gas.
For solving the problems of the technologies described above, technical solution adopted in the utility model is:
reclaim the device of methyl iodide in acetic acid production mesolow tail gas under one underload, it comprises the low pressure absorption tower, the fluid inlet on described low pressure absorption tower is by being equipped with the lean solution methanol pump on it, the feed liquor pipeline of methyl alcohol lean solution tank and lean solution water cooler is connected with the liquid outlet at the bottom of regenerator column and the outlet end of described feed liquor pipeline is connected with the methyl alcohol fluid inlet on low pressure absorption tower, at the bottom of the tower on low pressure absorption tower, liquid outlet is connected with the fluid inlet that absorbs the methyl alcohol basin by the fluid pipeline, one tunnel gas phase import on described low pressure absorption tower by the gaseous equilibrium pipeline with absorb that the methyl alcohol basin is connected and another road gas phase import and the whole cooler pipeline of giving vent to anger is connected, tower top at described regenerator column is connected with the regenerator column condenser, described regenerator column condenser is connected with the gaseous equilibrium pipeline by the non-condensable gas pipeline, the liquid exit of described regenerator column condenser is connected with liquid line, a branch road of described liquid line is connected with absorption methyl alcohol basin, and another branch road is connected with the refluxing opening of regenerator column, the liquid outlet of described absorption methyl alcohol basin is connected with the fluid pipeline, be equipped with on an arm of described fluid pipeline and absorb the methyl alcohol take away pump and be connected with reactor, regenerator column methanol feed pump is housed on another arm of described fluid pipeline and is connected with the regenerator column opening for feed.
The beneficial effects of the utility model are:
Prevent that the regenerator column condenser from obtaining entering quantizer near the mixture that the azeotropic of methyl iodide and methyl alcohol forms, reduce that in quantizer, methyl alcohol and acetic acid reaction generate ritalin, thereby the layered effect of quantizer is greatly improved, heavy phase proportion is improved.The heavy phase of quantizer and absorb containing iodine methyl alcohol rich solution and in time delivering to reactor of methyl alcohol basin has guaranteed the equilibrium iodine of system.
Description of drawings
Fig. 1 is the schematic flow sheet that the recovery of acetic acid of prior art is produced the device of methyl iodide in mesolow tail gas;
Fig. 2 is the schematic flow sheet that reclaims the device of methyl iodide in acetic acid production mesolow tail gas under a kind of underload of the present utility model.
Wherein:
1-regenerator column 2-regenerator column reboiler 3-regenerator column condenser 4-low pressure absorption tower 5-absorbs methyl alcohol basin 6-regenerator column methanol feed pump 7-and absorbs the whole cooler 13-of methyl alcohol take away pump 8-lightness-removing column 9-lightness-removing column reboiler 10-lightness-removing column primary cooler 11-quantizer 12-heavy phase pump 14-lean solution water cooler 15-methyl alcohol lean solution tank 16-lean solution methanol pump
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
The utility model device is the improvement on existing apparatus shown in Figure 1 basis.
reclaim the device of methyl iodide in acetic acid production mesolow tail gas under a kind of underload as shown in Figure 2, it comprises low pressure absorption tower 4, the fluid inlet on described low pressure absorption tower is by being equipped with lean solution methanol pump 16 on it, the feed liquor pipeline of methyl alcohol lean solution tank 15 and lean solution water cooler 14 is connected with the liquid outlet at the bottom of regenerator column and the outlet end of described feed liquor pipeline is connected with the methyl alcohol fluid inlet on low pressure absorption tower, at the bottom of the tower on low pressure absorption tower, liquid outlet is connected with the fluid inlet that absorbs methyl alcohol basin 5 by the fluid pipeline, one tunnel gas phase import on described low pressure absorption tower by the gaseous equilibrium pipeline with absorb that the methyl alcohol basin is connected and another road gas phase import and the whole cooler pipeline of giving vent to anger is connected.tower top at described regenerator column 1 is connected with regenerator column condenser 3, described regenerator column condenser is connected with the gaseous equilibrium pipeline by the non-condensable gas pipeline, the liquid exit of described regenerator column condenser is connected with liquid line, a branch road of described liquid line is connected with absorption methyl alcohol basin and another branch road is connected with the refluxing opening of regenerator column, the liquid outlet of described absorption methyl alcohol basin is connected with the fluid pipeline, be equipped with on an arm of described fluid pipeline and absorb methyl alcohol take away pump 7 and be connected with reactor, regenerator column methanol feed pump 6 is housed on another arm of described fluid pipeline and is connected with the regenerator column opening for feed.
The operating process of this device is as follows: (1) is first cooling through lean solution water cooler 14 with the methyl alcohol from 1 end of regenerator column in lean solution tank 15, then sends into low pressure absorption tower 4 together with fresh methanol by lean solution methanol pump 16; (2) methyl iodide that at the bottom of 4 towers of low pressure absorption tower, fluid and 3 condensations of regenerator column condenser are got off and the part of carbinol mixture are delivered to and are absorbed the methyl alcohol basin, and another part of the methyl iodide that 3 condensations of regenerator column condenser are got off and the mixture of methyl alcohol is back to regenerator column 1 top; Non-condensable gas in regenerator column condenser 3 is delivered to and is absorbed on methyl alcohol basin 5 and gaseous equilibrium pipeline that the low pressure absorption tower is connected; (3) part that absorbs methyl alcohol basin 5 contains iodine methyl alcohol rich solution and delivers to reactor by absorbing methyl alcohol take away pump 7, and another part contains iodine methyl alcohol rich solution and delivers to regenerator column 1 by regenerator column methanol feed pump 6.The control of the temperature in present method, pressure etc. adopts existing control parameter to get final product.
Claims (1)
1. reclaim the device of methyl iodide in acetic acid production mesolow tail gas under a underload, it is characterized in that: it comprises the low pressure absorption tower, the fluid inlet on described low pressure absorption tower is by being equipped with the lean solution methanol pump on it, the feed liquor pipeline of methyl alcohol lean solution tank and lean solution water cooler is connected with the liquid outlet at the bottom of regenerator column and the outlet end of described feed liquor pipeline is connected with the methyl alcohol fluid inlet on low pressure absorption tower, at the bottom of the tower on low pressure absorption tower, liquid outlet is connected with the fluid inlet that absorbs the methyl alcohol basin by the fluid pipeline, one tunnel gas phase import on described low pressure absorption tower by the gaseous equilibrium pipeline with absorb that the methyl alcohol basin is connected and another road gas phase import and the whole cooler pipeline of giving vent to anger is connected, tower top at described regenerator column is connected with the regenerator column condenser, described regenerator column condenser is connected with the gaseous equilibrium pipeline by the non-condensable gas pipeline, the liquid exit of described regenerator column condenser is connected with liquid line, a branch road of described liquid line is connected with absorption methyl alcohol basin, and another branch road is connected with the refluxing opening of regenerator column, the liquid outlet of described absorption methyl alcohol basin is connected with the fluid pipeline, be equipped with on an arm of described fluid pipeline and absorb the methyl alcohol take away pump and be connected with reactor, regenerator column methanol feed pump is housed on another arm of described fluid pipeline and is connected with the regenerator column opening for feed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220630349XU CN202936329U (en) | 2012-11-23 | 2012-11-23 | Device for recycling methyl iodide in low pressure tail gas in acetic acid production under low load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220630349XU CN202936329U (en) | 2012-11-23 | 2012-11-23 | Device for recycling methyl iodide in low pressure tail gas in acetic acid production under low load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202936329U true CN202936329U (en) | 2013-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220630349XU Expired - Lifetime CN202936329U (en) | 2012-11-23 | 2012-11-23 | Device for recycling methyl iodide in low pressure tail gas in acetic acid production under low load |
Country Status (1)
| Country | Link |
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| CN (1) | CN202936329U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784892A (en) * | 2014-12-17 | 2016-07-20 | 中国辐射防护研究院 | Anhydrous ethanol absorption-gas chromatography method for determining extremely tiny amount of iodomethane in gas |
-
2012
- 2012-11-23 CN CN201220630349XU patent/CN202936329U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784892A (en) * | 2014-12-17 | 2016-07-20 | 中国辐射防护研究院 | Anhydrous ethanol absorption-gas chromatography method for determining extremely tiny amount of iodomethane in gas |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 300452 No. ten, No. 3369, Lingang Industrial Zone, Tanggu District, Bohai, Tianjin Patentee after: TIANJIN BOHUA YONGLI CHEMICAL INDUSTRY Co.,Ltd. Address before: 300452 No. ten, No. 3369, Lingang Industrial Zone, Tanggu District, Bohai, Tianjin Patentee before: Tianjin Soda Plant, Tianjin Bohai Chemical Industry Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130515 |