CN103224443A - Improved ethanol distillation and dehydration energy-saving technology and equipment - Google Patents
Improved ethanol distillation and dehydration energy-saving technology and equipment Download PDFInfo
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- CN103224443A CN103224443A CN2013101771948A CN201310177194A CN103224443A CN 103224443 A CN103224443 A CN 103224443A CN 2013101771948 A CN2013101771948 A CN 2013101771948A CN 201310177194 A CN201310177194 A CN 201310177194A CN 103224443 A CN103224443 A CN 103224443A
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Abstract
The invention relates to an improved ethanol distillation and dehydration energy-saving technology and equipment. The improved ethanol distillation and dehydration energy-saving technology is characterized in that an ethanol rectifying tower is pressurized, the absolute pressure of the top of the pressurized rectifying tower is 150-700kPa, and the tower top temperature is 84 DEG C to 135.0 DEG C; and a tower top gaseous phase of the pressurized rectifying tower enters a partial condenser, the uncondensed gaseous phase directly enters an adsorption dewatering unit, and a liquid phase serving as reflux liquid returns to the rectifying tower. The ethanol distillation and dehydration equipment is characterized in that a material pipe of the tower top gaseous phase (5) of the pressurized rectifying tower (2) is connected with an inlet of the partial condenser (6), a material pipe at an outlet of the partial condenser is connected with the inlet of a reflux storage tank (7), and a material pipe at a storage tank gaseous phase outlet (9) is connected with the inlet of an adsorption unit (8); and a liquid phase material in the reflux storage tank serving as reflux liquid (8) returns to the ethanol rectifying tower. The improved ethanol distillation and dehydration energy-saving technology and equipment can be used for effectively reducing the consumption of heat energy and the condensation load on the top of the rectifying tower in the high-concentration ethanol production process and reducing the production cost of ethanol and have good application prospect.
Description
Technical field
The present invention relates to a kind of improved ethanol distillation dehydration energy saving technique and equipment, the high concentration ethanol of production can be used as industrial chemicals, anhydrous solvent or be used for producing alcohol fuel etc.
Background technology
Dehydrated alcohol is widely used in Chemical Manufacture raw material, organic solvent and railroad fuel etc., and wherein the dehydrated alcohol as railroad fuel claims alcohol fuel again.The external interdependency of China's energy constantly increases at present, and the energy security problem becomes increasingly conspicuous; The problem of environmental pollution of China has seriously restricted fast development of national economy; China's agriculture, rural areas and farmers problem is outstanding.It is significant to addressing the above problem to greatly develop the fuel ethanol production technology.
In traditional high concentration ethanol technological process of production, the ethanol dehydration process is what to separate with the ethanol rectifying, and concrete technical process as shown in Figure 1.The cat head gas phase 5 that obtains behind the ethanol raw material 1 process ethanol rectifying tower 2 enters condenser 15, the liquid phase material that condensation obtains enters backflow storage tank 7, wherein the Partial Liquid Phase material returns ethanol rectifying tower 2 as phegma 8, remaining liquid phase 13 enters revaporizer 14, enter absorbing unit 11 behind the revaporization after the gas phase 16, obtain the high concentration ethanol product 12 that needs after the absorption.In this flow process after rectifying, condensation obtains volume ratio is formed (the ethanol volume ratio is 97.6%) near the ethanol-water azeotropic thing liquid aqueous ethanol, because the absorbing unit inlet feed is that gas phase and pressure are greater than 150kPa, this liquid aqueous ethanol is before entering absorbing unit, need flash to gaseous state and forced feed once more, this can cause the waste of a large amount of heat energy undoubtedly.
Patent CN101525272 discloses a kind of ethanol distillation dehydration energy saving technique and equipment, as shown in Figure 2, principal character is after ethanol cat head gas phase enters condenser, only carry out partial condensation, enter the molecular sieve adsorption unit after the compressed machine compression of gas phase after the partial condensation, liquid phase is returned rectifying tower as phegma; The absolute pressure of compressor outlet is 100～700kPa.Wherein energy consumption of compressor is higher, floor space big and strictness limits for the gas phase discharge stability.The present invention has proposed a kind of improved ethanol distillation, dewatering process and equipment on this basis.
Summary of the invention
The present invention has provided an improved ethanol distillation dehydration production technique and equipment, can effectively reduce the process energy consumption, saves the high concentration ethanol production cost, has huge economic benefit and social benefit.
A kind of improved ethanol distillation dehydration production technique of the present invention, technical scheme is:
The ethanol rectifying tower adopts pressurized operation, and the absolute pressure of control compression rectification column overhead is 150～700kPa, and tower top temperature is 84 ℃～135.0.Compression rectification cat head gas phase entering part condenser, uncooled gas phase directly enters the adsorption dewatering unit, and liquid phase is returned rectifying tower as phegma.
The equipment of ethanol distillation dehydration production technique comprises ethanol compression rectification tower, fractional distillating tube, backflow storage tank, reboiler and absorbing unit; Compression rectification tower 2 cat head gas phases 5 materail tubes are connected to fractional distillating tube 6 inlets, and fractional distillating tube outlet material pipe coupling is to 7 imports of backflow storage tank, and the materail tube of storage tank gaseous phase outlet 9 is connected to absorbing unit 11 imports; Backflow storage tank liquid phase material returns the ethanol rectifying tower as phegma 8.
As shown in Figure 3, the cat head gas phase 5 entering part condensers 6 that obtain behind ethanol raw material 1 process ethanol rectifying tower 2 compression rectifications, the mixture that obtains enters backflow storage tank 7, liquid phase material wherein returns ethanol rectifying tower 2 as phegma 8, gaseous phase materials 9 enters absorbing unit 11, obtains the high concentration ethanol product 12 that needs after the absorption.
Distinctive feature of the present invention is: after ethanol compression rectification column overhead gas phase enters condenser, only carry out partial condensation, the gas phase after the partial condensation directly enters the molecular sieve adsorption unit, and liquid phase is returned rectifying tower as phegma.So just avoided evaporating the thermal waste of being brought after the condensation of aqueous ethanol steam elder generation in the traditional technology, simultaneously because the rectifying tower overhead vapours only carries out partial condensation, therefore also reduced the condensation load of rectifying tower overhead condenser, nor traditional atmosphere gas is pressurizeed with setting up compressor, can realize that technology is simpler, the purpose that energy consumption is lower.
In the described technology, the purpose of compression rectification is to make to satisfy the gaseous phase materials conditional request that enters the absorbing unit needs by the cat head gaseous pressure that comes out, and is 150～700kPa so the pressurizing tower tower top pressure reaches absolute pressure, and tower top temperature is 84 ℃～135.0 at this moment.
The present invention can effectively reduce the condensation load of heat energy, kinetic energy consumption and rectifying tower cat head in the high concentration ethanol production process, reduces the alcoholic acid production cost, has a good application prospect.
Description of drawings
Fig. 1 is conventional ethanol distillation dehydration process flow diagram;
Fig. 2 is the ethanol distillation dehydration energy saving technique schematic flow sheet;
Fig. 3 is a kind of improved ethanol distillation dehydration energy saving technique and equipment;
Among the figure, 1. raw material, 2. ethanol compression rectification tower, 3. reboiler, 4. discharging at the bottom of the tower, 5. cat head gas phase, 6. fractional distillating tube, 7. backflow storage tank, 8. phegma, 9. gas phase, 10. compressor, 11. absorbing units, 12. high concentration ethanol, 13. liquid phases, 14. revaporizers, 15. condenser, gas phase behind 16. revaporization.
Embodiment
Below in conjunction with accompanying drawing technology and equipment provided by the present invention is further detailed.
The present invention is achieved through the following technical solutions:
As shown in Figure 3, equipment of the present invention connects as follows: compression rectification tower 2 cat head gas phases 5 materail tubes are connected to fractional distillating tube 6 inlets, fractional distillating tube outlet material pipe coupling is to 7 imports of backflow storage tank, and the materail tube of storage tank gaseous phase outlet 9 is connected to absorbing unit 11 imports; Backflow storage tank liquid phase material returns the ethanol rectifying tower as phegma 8.
Operating process is: with ethanol content is that 5～50% stock liquid 1 enters ethanol rectifying tower 2, tower top pressure 200kPa, rectifying tower cat head vapour phase 5 is for forming the aqueous ethanol steam of (the ethanol volume ratio is 97.6%) near the ethanol-water azeotropic thing, this steam is after condenser 6 carries out partial condensation, the mixture that obtains enters backflow storage tank 7, liquid phase is returned rectifying tower 2 as phegma 8, gaseous phase materials 9 directly enters molecular sieve adsorption unit 11, is dehydrated alcohol more than 99.5% through obtaining the ethanol volume ratio behind the adsorption dewatering.
Technology and equipment of the present invention can be applicable to the high concentration ethanol production process, for the advantage of the present invention aspect energy-saving and cost-reducing is described better, chooses an application example and is illustrated, but therefore do not limit the scope of application of present technique and equipment.
For the advantage of explanation the present invention aspect energy-conservation, flow process of the present invention and existing single tower separation process and ethanol distillation dehydration energy saving technique flow process (CN101525272) are compared, mainly energy expenditure sees Table 1.
Energy consumption relatively in table 1 technology
In the ethanol dehydration process, remove outside the reboiler energy consumption, main energy consumption concentrates on phlegma once more in the evaporative process, can see from calculation result, embodiment compares energy-conservation 15.88% with old process, and also decrease than CN101525272 energy consumption, can cut down the consumption of general facilities in the alcohol production operating process significantly, realized energy saving purposes.
A kind of improved ethanol distillation dehydration energy saving technique and equipment that the present invention proposes, be described by preferred embodiment, person skilled obviously can be in not breaking away from content of the present invention, spirit and scope to structure as herein described with technological method is changed or suitably change and combination, realize the technology of the present invention.Special needs to be pointed out is, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included in spirit of the present invention, scope and the content.
Claims (2)
1. ethanol distillation dehydration production technique is characterized in that: the ethanol rectifying tower adopts pressurized operation, and the absolute pressure of compression rectification column overhead is 150～700kPa, and tower top temperature is 84 ℃～135.0; Compression rectification cat head gas phase entering part condenser, uncooled gas phase directly enters the adsorption dewatering unit, and liquid phase is returned rectifying tower as phegma.
2. the equipment of the ethanol distillation dehydration of claim 1 production comprises ethanol compression rectification tower, fractional distillating tube, backflow storage tank, reboiler and absorbing unit; It is characterized in that: compression rectification tower (2) cat head gas phase (5) materail tube is connected to fractional distillating tube (6) inlet, fractional distillating tube outlet material pipe coupling is to backflow storage tank (7) import, and the materail tube of storage tank gaseous phase outlet (9) is connected to absorbing unit (11) import; Backflow storage tank liquid phase material returns the ethanol rectifying tower as phegma (8).
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| CN2013101771948A CN103224443A (en) | 2013-05-14 | 2013-05-14 | Improved ethanol distillation and dehydration energy-saving technology and equipment |
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| CN2013101771948A CN103224443A (en) | 2013-05-14 | 2013-05-14 | Improved ethanol distillation and dehydration energy-saving technology and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207262A (en) * | 2018-10-17 | 2019-01-15 | 武汉轻工大学 | The extraction element and extracting method of volatile plant essence oil |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101525272A (en) * | 2009-04-07 | 2009-09-09 | 天津大学 | Ethanol distillation dehydration energy saving technique and device |
| CN102037128A (en) * | 2008-03-31 | 2011-04-27 | 宇部兴产株式会社 | Purification treatment method for fermented alcohol |
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2013
- 2013-05-14 CN CN2013101771948A patent/CN103224443A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102037128A (en) * | 2008-03-31 | 2011-04-27 | 宇部兴产株式会社 | Purification treatment method for fermented alcohol |
| CN101525272A (en) * | 2009-04-07 | 2009-09-09 | 天津大学 | Ethanol distillation dehydration energy saving technique and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109207262A (en) * | 2018-10-17 | 2019-01-15 | 武汉轻工大学 | The extraction element and extracting method of volatile plant essence oil |
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Application publication date: 20130731 |