CN109675334A - Potassium tert-butoxide directly connects compression from backheat distillation system and method - Google Patents
Potassium tert-butoxide directly connects compression from backheat distillation system and method Download PDFInfo
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- CN109675334A CN109675334A CN201910056092.8A CN201910056092A CN109675334A CN 109675334 A CN109675334 A CN 109675334A CN 201910056092 A CN201910056092 A CN 201910056092A CN 109675334 A CN109675334 A CN 109675334A
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- compressor
- tower
- distillation system
- tower reactor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/007—Energy recuperation; Heat pumps
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
Abstract
The invention discloses a kind of potassium tert-butoxides directly to connect compression from backheat distillation system, it include: rectifying column, phase-splitter, overhead condenser and tower reactor reboiler, it is characterized in that, compressor is equipped between the refrigerant exit of the overhead condenser and the tower reactor reboiler heat source import, the compressor enters tower reactor reboiler heat source import after heating overhead vapours compression and is used for heating tower's kettle liquid, and the overhead vapours lime set after heat exchange is flowed out from tower reactor reboiler thermal source outlet enters the phase-splitter.Of the invention using from backheat distillation system uses clean electrical energy drive compressor that overhead vapours is carried out compression heating as the heat source of tower reactor, phase-splitter is entered back into after release heat, the use of a large amount of steam and recirculated water has been saved, about 75% operation operating cost can be saved under same operating condition every year.
Description
Technical field
The invention belongs to potassium tert-butoxide production technical fields, and in particular to a kind of potassium tert-butoxide directly connects compression from backheat essence
Evaporate system and method.
Background technique
Potassium tert-butoxide is a kind of important organic base, because of the inductive effect of wherein 3 methyl, than other alkali metal alcoholates tool
There are stronger alkalinity and activity, can be used as catalyst, is largely used in the reactions such as condensation, rearrangement and open loop.So at home and abroad
Favor increasingly by industries such as chemical industry, medicine, pesticides in the market.
Currently, potassium tert-butoxide is alkaline process preparation using more extensive production method, i.e., it is anti-with potassium hydroxide by the tert-butyl alcohol
It should obtain potassium tert-butoxide and water.Above-mentioned reaction is a strong reversible reaction, needs in time to remove the water of generation, so as to react to life
It is carried out at the direction of potassium tert-butoxide.Therefore the industrial method for using azeotropic reactive distillation, no using entrainer (such as hexamethylene)
Offset is except the water generated.Reaction process cyclohexane, the tert-butyl alcohol and water are steamed in the form of mixed vapour from tower top, are condensed laggard
Enter phase-splitter, reprocessed in the water phase of lower layer containing tert-butyl alcohol extraction, the alcohol phase on upper layer containing hexamethylene and is butanol reflux
To rectifying column, contain the tert-butyl alcohol, potassium tert-butoxide and a small amount of hexamethylene in tower reactor extraction.In actual production, the process reflux ratio
20~25, steam consumption is larger for more controls.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of potassium tert-butoxides of economical and energy saving directly to connect pressure
It contracts from backheat distillation system and method.
The present invention is achieved by the following technical solutions:
A kind of potassium tert-butoxide directly connects compression from backheat distillation system, comprising: rectifying column, phase-splitter, overhead condenser and
Tower reactor reboiler, which is characterized in that set between the refrigerant exit of the overhead condenser and the tower reactor reboiler heat source import
Enter tower reactor reboiler heat source import after thering is compressor, the compressor to heat overhead vapours compression and be used for heating tower's kettle liquid,
Overhead vapours lime set after heat exchange is flowed out from tower reactor reboiler thermal source outlet enters the phase-splitter.
In the above-mentioned technical solutions, one first is equipped between the thermal source outlet of the tower reactor reboiler and return tank import to change
Hot device, for further cooling down the overhead vapours.
It in the above-mentioned technical solutions, further include one second heat exchanger, for supplementing steam heating tower's kettle liquid.
In the above-mentioned technical solutions, the compressor is lobed rotor compressor, double-screw compressor or centrifugal compressor.
In the above-mentioned technical solutions, the pressure ratio of the compressor is 1.5~4.
In the above-mentioned technical solutions, the compressor carries out compression to heat process being single stage compress or multistage to overhead vapours
Compression.
In the above-mentioned technical solutions, tower top temperature is 60~80 DEG C, and bottom temperature is 80~90 DEG C.
Application of the above-mentioned distillation system in potassium tert-butoxide production.
The advantages and benefits of the present invention are:
Of the invention using from backheat distillation system is compressed overhead vapours using clean electrical energy drive compressor
The heat source to heat up as tower reactor enters back into phase-splitter after discharging heat, has saved the use of a large amount of steam and recirculated water, same work
About 75% operation operating cost can be saved under condition every year.
Detailed description of the invention
Fig. 1 is the general flow chart of the embodiment of the present invention 1.
Wherein, 1 is rectifying column, and 2 be phase-splitter, and 3 be compressor, and 4 be tower reactor reboiler, and 5 be First Heat Exchanger, and 6 be
Two heat exchangers.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, in the following with reference to the drawings and specific embodiments into
One step illustrates technical solution of the present invention.
Embodiment 1
30 DEG C, the raw material of 400kg/h enter rectifying column (including 48% potassium hydroxide 44.2kg/h, 80% tert-butyl alcohol and
The mixture 355.8kg/h of 20% hexamethylene), which is atmospheric tower, and tower top temperature is 75 DEG C, and the refrigerant of overhead condenser goes out
Mouthful compressor is equipped between the tower reactor reboiler heat source import, the pressure ratio of the compressor is 2, and compressor is by overhead vapours pressure
Contracting heats into 90 DEG C, enters tower reactor reboiler heat source import after the steam of 180kPa and is used for heating tower's kettle liquid, the tower top after heat exchange
The lime set that steam phase transforming is 90 DEG C is equipped with a First Heat Exchanger between the thermal source outlet and phase-splitter import of tower reactor reboiler, use
In further cooling down the overhead vapours lime set into 70 DEG C subsequently into the phase-splitter.The liquid of phase-splitter lower layer is (predominantly
The tert-butyl alcohol and water) it produces, the liquid (predominantly hexamethylene and the tert-butyl alcohol) on phase-splitter upper layer is back to tower top；Tower bottoms includes
10.5% potassium tert-butoxide, bottom temperature are 83 DEG C, and tower bottoms partially produces after evaporating in tower reactor reboiler, and another part returns
Into tower reactor.Heat needed for the heat obtained as compressor compresses overhead vapours is less than heating tower's kettle liquid, the distillation system
It further include one second heat exchanger, for supplementing 0.14t/h steam heating tower's kettle liquid.
Above-mentioned percentage is mass percent.
Embodiment 2
30 DEG C, the raw material of 1630kg/h enter rectifying column (including 48% potassium hydroxide 180kg/h, 80% tert-butyl alcohol and
The mixture 1450kg/h of 20% hexamethylene), which is atmospheric tower, and tower top temperature is 75 DEG C, and the refrigerant of overhead condenser goes out
Mouthful compressor is equipped between the tower reactor reboiler heat source import, the pressure ratio of the compressor is 1.8, and compressor is by overhead vapours
Compression heats into 92 DEG C, enters tower reactor reboiler heat source import after the steam of 180kPa and is used for heating tower's kettle liquid, the tower after heat exchange
The lime set that steam phase transforming is 92 DEG C is pushed up, a First Heat Exchanger is equipped between the thermal source outlet and phase-splitter import of tower reactor reboiler,
For further cooling down the overhead vapours lime set into 70 DEG C subsequently into the phase-splitter.The liquid of phase-splitter lower layer is (main
For the tert-butyl alcohol and water) it produces, the liquid (predominantly hexamethylene and the tert-butyl alcohol) on phase-splitter upper layer is back to tower top；Tower bottoms includes
12% potassium tert-butoxide, bottom temperature are 87 DEG C, and tower bottoms partially produces after evaporating in tower reactor reboiler, and another part returns to
In tower reactor.Heat needed for the heat obtained as compressor compresses overhead vapours is less than heating tower's kettle liquid, the distillation system is also
Including one second heat exchanger, for supplementing 0.14t/h steam heating tower's kettle liquid.
Embodiment 3
30 DEG C, the raw material of 3260kg/h enter rectifying column (including 48% potassium hydroxide 327kg/h, 80% tert-butyl alcohol and
The mixture 2933kg/h of 20% hexamethylene), which is atmospheric tower, and tower top temperature is 65 DEG C, and the refrigerant of overhead condenser goes out
Mouthful compressor is equipped between the tower reactor reboiler heat source import, the pressure ratio of the compressor is 3.7, and compressor is by overhead vapours
Compression heats into 92 DEG C, enters tower reactor reboiler heat source import after the steam of 370kPa and is used for heating tower's kettle liquid, the tower after heat exchange
Pushing up steam phase transforming is 92 DEG C, and the lime set of 370kPa is equipped with one first between the thermal source outlet and phase-splitter import of tower reactor reboiler
Heat exchanger, for further cooling down the overhead vapours lime set into 70 DEG C subsequently into the phase-splitter.The liquid of phase-splitter lower layer
Body (the predominantly tert-butyl alcohol and water) extraction, the liquid (predominantly hexamethylene and the tert-butyl alcohol) on phase-splitter upper layer are back to tower top；Tower
Kettle liquid includes 14% potassium tert-butoxide, and bottom temperature is 85 DEG C, and tower bottoms partially produces after evaporating in tower reactor reboiler, another
Part returns in tower reactor.Heat needed for the heat obtained as compressor compresses overhead vapours is less than heating tower's kettle liquid, the essence
The system of evaporating further includes one second heat exchanger, for supplementing 0.14t/h steam heating tower's kettle liquid.
It is compared with the operating cost of the prior art of same thermic load: (according to local concrete condition, according to steam price
180 yuan/ton, 0.7 yuan of electricity price/degree, 0.2 yuan/m of cooling water price3, annual to be calculated by operation in 8000 hours)
By comparison it is found that the amount that method of the invention consumes steam and recirculated water is significantly smaller than the prior art, using clear
Clean electrical energy drive compressor, environmental protection pressure is small, year operating cost can reduce about 75.2%.
Illustrative description has been done to the present invention above, it should explanation, the case where not departing from core of the invention
Under, any simple deformation, modification or other skilled in the art can not spend the equivalent replacement of creative work equal
Fall into protection scope of the present invention.
Claims (8)
1. a kind of potassium tert-butoxide directly connects compression from backheat distillation system, comprising: rectifying column, phase-splitter, overhead condenser and tower
Kettle reboiler, which is characterized in that be equipped between the refrigerant exit of the overhead condenser and the tower reactor reboiler heat source import
Compressor, the compressor enter tower reactor reboiler heat source import after heating overhead vapours compression and are used for heating tower's kettle liquid, change
Overhead vapours lime set after heat is flowed out from tower reactor reboiler thermal source outlet enters the phase-splitter.
2. distillation system according to claim 1, which is characterized in that the thermal source outlet and return tank of the tower reactor reboiler
A First Heat Exchanger is equipped between import, for further cooling down the overhead vapours.
3. distillation system according to claim 2, which is characterized in that further include one second heat exchanger, for supplementing steam
Heating tower's kettle liquid.
4. distillation system according to claim 3, which is characterized in that the compressor is lobed rotor compressor, twin-screw pressure
Contracting machine or centrifugal compressor.
5. distillation system according to claim 4, which is characterized in that the pressure ratio of the compressor is 1.5~4.
6. distillation system according to claim 5, which is characterized in that the compressor carries out compression to overhead vapours and heats
Process is single stage compress or multi-stage compression.
7. distillation system according to claim 6, which is characterized in that tower top temperature is 60~80 DEG C, bottom temperature 80
~90 DEG C.
8. application of the distillation system in potassium tert-butoxide production as described in claim 1~7 is any.
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| CN201910056092.8A CN109675334A (en) | 2019-01-22 | 2019-01-22 | Potassium tert-butoxide directly connects compression from backheat distillation system and method |
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| CN201910056092.8A CN109675334A (en) | 2019-01-22 | 2019-01-22 | Potassium tert-butoxide directly connects compression from backheat distillation system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110975315A (en) * | 2019-12-09 | 2020-04-10 | 天津科技大学 | Energy-saving rectification purification system for high-purity propylene oxide |
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| DE4235431C1 (en) * | 1992-10-21 | 1994-01-20 | Huels Chemische Werke Ag | Process for the separation of ethylbenzene / styrene by distillation of a liquid mixture consisting mainly of styrene and ethylbenzene |
| US20110313207A1 (en) * | 2009-02-26 | 2011-12-22 | Gerd Kaibel | Process for distillative workup of a methanol/water mixture and process for preparing alkali metal methoxides |
| CN101492349A (en) * | 2009-03-13 | 2009-07-29 | 清华大学 | Production process for energy-saving environment-friendly methanol dehydration joint production of combustion extractive dimethyl ether |
| CN101549211A (en) * | 2009-04-21 | 2009-10-07 | 西安交通大学 | Energy-saving and modification method for heat pump distillation and device thereof |
| CN203710726U (en) * | 2014-02-18 | 2014-07-16 | 肖学明 | Heat pump rectifying device for oil-free screw compressor |
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Application publication date: 20190426 |