CN108821289A - A kind of process units and method of food-grade carbon-dioxide - Google Patents
A kind of process units and method of food-grade carbon-dioxide Download PDFInfo
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Abstract
A kind of process units of food-grade carbon-dioxide, including：Purifying column；Hypothermia distillation device and heat exchange coil are successively arranged inside the purifying column from top to bottom, bottom is equipped with products export, and top is respectively equipped with liquid CO 2 import and foreign gas outlet；Hypothermia distillation device is equipped with gas recovery import；The caliber of the heat exchange coil is 100~200mm；The carbon dioxide heat source feedway being connected with the air inlet of heat exchange coil；The carbon dioxide heat source feedway includes the carbon dioxide gas source device being sequentially connected, compression set, desulfurizer and de- hydrocarbon device；The gas vent of the de- hydrocarbon device is communicated with the air inlet of heat exchange coil；The gas-liquid separation device being connected with the gas outlet of heat exchange coil；The liquid-phase outlet of the gas-liquid separation device is communicated with liquid CO 2 import；Decompression cooling device between foreign gas outlet and gas recovery import is set.The purity of the food-grade carbon-dioxide of process units production reaches 99.99%, and other indexs meet national standard.
Description
Technical field
The present invention relates to chemical equipment technical fields, are to be related to a kind of production of food-grade carbon-dioxide more specifically
Device and method.
Background technique
Currently, the method for purification of food-class liquid CO 2 have compression condensation method, solvent absorption, adsorption separation method,
Membrane separation process, cryogenic rectification method etc..Wherein, cryogenic rectification method combines the advantages of low temperature and rectifying, the carbon dioxide of production
Purity is higher and stablizes, more and more by the extensive concern of researcher.
What the prior art generallyd use, which is liquefied ammonia, as heat source carries out cryogenic rectification to liquid CO 2；But it is above-mentioned
The product purity of process units and the method production of carbon dioxide is unable to reach the purity of food-class liquid CO 2 99.99%
And guarantee the requirement that meet national standards of other indexs.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of process units of food-grade carbon-dioxide and method, production
The purity of food-grade carbon-dioxide reach 99.99%, and other indexs meet national standard.
The present invention provides a kind of process units of food-grade carbon-dioxide, including：
Purifying column；Hypothermia distillation device and heat exchange coil are successively arranged inside the purifying column from top to bottom, bottom is equipped with
Products export, top are respectively equipped with liquid CO 2 import and foreign gas outlet；The hypothermia distillation device is equipped with recycling
Gas feed；The caliber of the heat exchange coil is 100mm~200mm；
The carbon dioxide heat source feedway being connected with the air inlet of the heat exchange coil；The carbon dioxide heat source supply
Device includes the carbon dioxide gas source device being sequentially connected, compression set, desulfurizer and de- hydrocarbon device；The de- hydrocarbon device
Gas vent is communicated with the air inlet of the heat exchange coil；
The gas-liquid separation device being connected with the gas outlet of the heat exchange coil；The liquid-phase outlet of the gas-liquid separation device with
The liquid CO 2 import communicates；
Decompression cooling device between the foreign gas outlet and gas recovery import is set.
Preferably, the hypothermia distillation device is additionally provided with gas recovery outlet.
The present invention also provides a kind of production methods of food-grade carbon-dioxide, by adopting the above technical scheme the production
Device includes the following steps：
A) atmospheric carbon dioxide is successively compressed, desulfurization and de- hydrocarbon, obtains heat source gas；
B) after the heat source gas for obtaining step a) and liquid CO 2 to be purified exchange heat, cryogenic rectification is carried out, point
Heat source gas and food-grade carbon-dioxide after not obtaining foreign gas, cooling；Heat exchange coil used in the heat transfer process
Caliber is 100mm~200mm；
C) carbon dioxide in foreign gas that step b) is obtained is recycled, at the same by the heat source gas after cooling into
Row gas-liquid separation obtains the purification process that liquid CO 2 to be purified repeats step b).
Preferably, the pressure of compression described in step a) is 2MPa~3MPa.
Preferably, the sulfur content of desulfurization described in step a) is less than or equal to 0.2ppm；The total hydrocarbon content of the de- hydrocarbon is
Less than or equal to 25ppm.
Preferably, the temperature of heat source gas described in step b) is 30 DEG C~40 DEG C, flow 900Nm3/ h~1100Nm3/
h。
Preferably, the temperature of liquid CO 2 to be purified described in step b) is -15 DEG C~-20 DEG C.
Preferably, the gas-liquid volume flow ratio of heat exchange described in step b) is (200~500)：1.
Preferably, the pressure of cryogenic rectification described in step b) is 2.1MPa~2.4MPa.
Preferably, the temperature of the heat source gas after cooling down described in step c) is -5 DEG C~5 DEG C.
The present invention provides a kind of process units of food-grade carbon-dioxide, including：Purifying column；Inside the purifying column certainly
Hypothermia distillation device and heat exchange coil are successively arranged under above, bottom is equipped with products export, and top is respectively equipped with liquid titanium dioxide
Carbon import and foreign gas outlet；The hypothermia distillation device is equipped with gas recovery import；The caliber of the heat exchange coil is
100mm~200mm；The carbon dioxide heat source feedway being connected with the air inlet of the heat exchange coil；The carbon dioxide heat
Source feedway includes the carbon dioxide gas source device being sequentially connected, compression set, desulfurizer and de- hydrocarbon device；The de- hydrocarbon
The gas vent of device is communicated with the air inlet of the heat exchange coil；The gas-liquid separation being connected with the gas outlet of the heat exchange coil
Device；The liquid-phase outlet of the gas-liquid separation device is communicated with the liquid CO 2 import；It is arranged in the foreign gas
Decompression cooling device between outlet and gas recovery import.Compared with prior art, process units provided by the invention uses
Process gas carbon dioxide is as heat source, and the caliber for improving heat exchange coil adapts it to the heat transfer requirements of above-mentioned heat source, production
The purity of food-grade carbon-dioxide reach 99.99%, and other indexs meet national standard.
In addition, production method simple process provided by the invention, regulation are flexibly, and exchange heat sufficiently, and it is at low cost, actually answer
It is good with effect, meet industrialization production requirements.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the process units of food-grade carbon-dioxide provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution of the present invention is clearly and completely described, it is clear that institute
The embodiment of description is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
The present invention provides a kind of process units of food-grade carbon-dioxide, including：
Purifying column；Hypothermia distillation device and heat exchange coil are successively arranged inside the purifying column from top to bottom, bottom is equipped with
Products export, top are respectively equipped with liquid CO 2 import and foreign gas outlet；The hypothermia distillation device is equipped with recycling
Gas feed；The caliber of the heat exchange coil is 100mm~200mm；
The carbon dioxide heat source feedway being connected with the air inlet of the heat exchange coil；The carbon dioxide heat source supply
Device includes the carbon dioxide gas source device being sequentially connected, compression set, desulfurizer and de- hydrocarbon device；The de- hydrocarbon device
Gas vent is communicated with the air inlet of the heat exchange coil；
The gas-liquid separation device being connected with the gas outlet of the heat exchange coil；The liquid-phase outlet of the gas-liquid separation device with
The liquid CO 2 import communicates；
Decompression cooling device between the foreign gas outlet and gas recovery import is set.
In the present invention, the process units of the food-grade carbon-dioxide includes purifying column, carbon dioxide heat source supply dress
Set, gas-liquid separation device and decompression cooling device.Referring to Fig. 1, Fig. 1 is food-grade carbon-dioxide provided in an embodiment of the present invention
Process units structural schematic diagram；Wherein, 1 is purifying column, and 2 be hypothermia distillation device, and 3 be heat exchange coil, and 4 go out for product
Mouthful, 5 be liquid CO 2 import, 6 for foreign gas export, 7 be gas recovery import, 8 be heat exchange coil air inlet, 9
It is carbon dioxide gas source device for carbon dioxide heat source feedway, 10,11 be compression set, and 12 be desulfurizer, and 13 be de-
Hydrocarbon device, 14 be the gas outlet of heat exchange coil, and 15 be gas-liquid separation device, and 16 be the liquid-phase outlet of gas-liquid separation device, and 17 are
Cooling device is depressurized, 18 export for gas recovery.
In the present invention, it is successively arranged hypothermia distillation device and heat exchange coil, bottom from top to bottom inside the purifying column
Equipped with products export, top is respectively equipped with liquid CO 2 import and foreign gas outlet.In the present invention, the low temperature essence
Distillation unit is equipped with gas recovery import and gas recovery exports；The atmospheric carbon dioxide of recycling is entered by the gas recovery import
The hypothermia distillation device, then exported and be discharged by gas recovery, it is recycled.
In the present invention, the heat exchange coil exchanges heat for heat source gas with liquid CO 2 to be purified；It is excellent
Choosing includes the pipeline of coil pipe for heating and external connection.In the present invention, the caliber of the heat exchange coil is preferably 100mm
~200mm.
In the present invention, the purification tower bottom is equipped with products export, obtains food-grade carbon-dioxide for producing；It is described
Food-grade carbon-dioxide is liquid, and after products export output, into food-grade carbon-dioxide storage tank, the present invention does not have this
Have specifically limited.
In the present invention, the liquid CO 2 import is used to liquid CO 2 to be purified being delivered to purification
Tower；The foreign gas outlet is for exporting the purifying column for foreign gas.
In the present invention, the heat exchange coil is equipped with air inlet and air outlet；Wherein, the air inlet of the heat exchange coil with
The carbon dioxide heat source feedway is connected.In the present invention, the carbon dioxide heat source feedway includes being sequentially connected
Carbon dioxide gas source device, compression set, desulfurizer and de- hydrocarbon device；Wherein, the gas vent of the de- hydrocarbon device with
The air inlet of the heat exchange coil directly communicates.
In the present invention, the carbon dioxide gas source device is for providing atmospheric carbon dioxide, and the present invention is to this without spy
Different limitation.In the present invention, the compression set is preferably compressor, the gas for exporting to the carbon dioxide gas source device
Body carbon dioxide pressurizes.In the present invention, the desulfurizer is preferably desulfurizing tower, for exporting to the compression set
Atmospheric carbon dioxide carry out desulfurization.In the present invention, the de- hydrocarbon device is preferably dealkylation tower, for the desulfurizer
The atmospheric carbon dioxide of output carries out de- hydrocarbon.In the present invention, the atmospheric carbon dioxide of the de- hydrocarbon device output is heat source
Gas is exported by the gas vent of the de- hydrocarbon device, and the air inlet through the heat exchange coil enters the heat exchange coil.
In the present invention, the gas outlet of the heat exchange coil is connected with the gas-liquid separation device.In the present invention, described
Gas-liquid separation device is preferably gas-liquid separator, for carrying out gas-liquid separation to the heat source gas after cooling；Obtained liquid two
Carbonoxide can be recycled to the purifying column into one through the liquid CO 2 import as liquid CO 2 to be purified
Step processing.In the present invention, the gas-liquid separation device is equipped with air inlet and liquid-phase outlet；Wherein, the gas-liquid separation device
Air inlet directly communicated with the gas outlet of the heat exchange coil；The liquid-phase outlet of the gas-liquid separation device and the liquid two
Carbonoxide import directly communicates.
In the present invention, the decompression cooling device setting is between foreign gas outlet and gas recovery import；
For carrying out decompression cooling to the foreign gas of foreign gas outlet output, atmospheric carbon dioxide is obtained, and then through institute
Gas recovery import is stated, obtained atmospheric carbon dioxide is delivered to the hypothermia distillation device.
Process units provided by the invention uses process gas carbon dioxide as heat source, instead of the liquid of traditional purifying column
Ammonia makes liquefied ammonia become process gas carbon dioxide as purifying column cooling capacity as the two-stage heat exchange of purifying column cold recovery medium and returns
The single-stage heat exchange of medium is received, cold recovery rate is improved by 50% to 70% or so；And the caliber of heat exchange coil is improved, specifically by passing
The 80mm of system purifying column is changed to 100mm~200mm, adapts it to the heat transfer requirements of above-mentioned heat source, the food-grade titanium dioxide of production
The purity of carbon reaches 99.99%, and other indexs meet national standard.
The present invention also provides a kind of production methods of food-grade carbon-dioxide, by adopting the above technical scheme the production
Device includes the following steps：
A) atmospheric carbon dioxide is successively compressed, desulfurization and de- hydrocarbon, obtains heat source gas；
B) after the heat source gas for obtaining step a) and liquid CO 2 to be purified exchange heat, cryogenic rectification is carried out, point
Heat source gas and food-grade carbon-dioxide after not obtaining foreign gas, cooling；Heat exchange coil used in the heat transfer process
Caliber is 100mm~200mm；
C) carbon dioxide in foreign gas that step b) is obtained is recycled, at the same by the heat source gas after cooling into
Row gas-liquid separation obtains the purification process that liquid CO 2 to be purified repeats step b).
The present invention first successively compresses atmospheric carbon dioxide, desulfurization and de- hydrocarbon, obtains heat source gas.The present invention couple
The source of the atmospheric carbon dioxide is not particularly limited, and is using process gas carbon dioxide well known to those skilled in the art
It can.
In the present invention, the pressure of the compression is preferably 2MPa~3MPa, more preferably 2.3MPa~2.5MPa.
In the present invention, the sulfur content of the desulfurization, which is preferably less than, is equal to 0.2ppm, is more preferably less than equal to
0.1mmp；The total hydrocarbon content of the de- hydrocarbon, which is preferably less than, is equal to 25ppm, is more preferably less than equal to 20ppm.
After obtaining the heat source gas, the present invention exchanges heat obtained heat source gas and liquid CO 2 to be purified
Afterwards, cryogenic rectification, heat source gas and food-grade carbon-dioxide after respectively obtaining foreign gas, cooling are carried out.In the present invention,
The temperature of the heat source gas is preferably 30 DEG C~40 DEG C, more preferably 35 DEG C；The flow of the heat source gas is preferably
900Nm3/ h~1100Nm3/ h, more preferably 1000Nm3/h。
In the present invention, the temperature of the liquid CO 2 to be purified is preferably -15 DEG C~-20 DEG C.The present invention couple
The source of the liquid CO 2 to be purified is not particularly limited；It is described to be purified in the preferred embodiment of the invention
Liquid CO 2 can be obtained by the heat source gas after cooling down through gas-liquid separation.
In the present invention, the process of the heat exchange carries out in the heat exchange coil；The heat exchange coil preferably includes to use
In the coil pipe of heating and the pipeline of external connection.In the present invention, the caliber of the heat exchange coil is preferably 100mm~200mm.
In the present invention, the gas-liquid volume flow ratio of the heat exchange is preferably (200~500)：1, more preferably 350：1.
In the present invention, the pressure of the cryogenic rectification is preferably 2.1MPa~2.4MPa, and more preferably 2.2MPa~
2.3MPa。
In the present invention, the food-grade carbon-dioxide obtained is product, after products export output, is entered
Food-grade carbon-dioxide storage tank, it is not specifically limited to this by the present invention.
After heat source gas after respectively obtaining the foreign gas and cooling, the present invention is by two in obtained foreign gas
Carbonoxide is recycled, while the heat source gas after cooling is carried out gas-liquid separation, obtains liquid CO 2 weight to be purified
Multiple above-mentioned purification process.In the present invention, partial CO 2 is had in the foreign gas to escape in gaseous form, subtracted
Pressure drop Wen Houzai can carry out carbon dioxide recovery by purifying column.
In the present invention, the temperature of the heat source gas after the cooling is preferably -5 DEG C~5 DEG C.Present invention preferably employs two
Carbonoxide vaporizer is further cooled down, and the progress of the gas-liquid separation process is conducive to.The present invention is by the heat source after cooling
Gas carries out gas-liquid separation, and obtaining liquid CO 2 can be used as liquid titanium dioxide to be purified as described in the above technical scheme
Carbon repeats above-mentioned purification process.
Production method simple process provided by the invention, regulation flexibly, and heat source is sufficient, heat exchange sufficiently, made by liquefied ammonia
Become list of the process gas carbon dioxide as purifying column cold recovery medium for the two-stage heat exchange of purifying column cold recovery medium
Grade heat exchange, is reduced by the reduction of energy transmission number between heat transferring medium because of the bring energy loss that exchanges heat, cold recovery rate
It is improved by 50% to 70% or so, at low cost, practical application effect is good, meets industrialization production requirements.
The present invention provides a kind of process units of food-grade carbon-dioxide, including：Purifying column；Inside the purifying column certainly
Hypothermia distillation device and heat exchange coil are successively arranged under above, bottom is equipped with products export, and top is respectively equipped with liquid titanium dioxide
Carbon import and foreign gas outlet；The hypothermia distillation device is equipped with gas recovery import；The caliber of the heat exchange coil is
100mm~200mm；The carbon dioxide heat source feedway being connected with the air inlet of the heat exchange coil；The carbon dioxide heat
Source feedway includes the carbon dioxide gas source device being sequentially connected, compression set, desulfurizer and de- hydrocarbon device；The de- hydrocarbon
The gas vent of device is communicated with the air inlet of the heat exchange coil；The gas-liquid separation being connected with the gas outlet of the heat exchange coil
Device；The liquid-phase outlet of the gas-liquid separation device is communicated with the liquid CO 2 import；It is arranged in the foreign gas
Decompression cooling device between outlet and gas recovery import.Compared with prior art, process units provided by the invention uses
Process gas carbon dioxide is as heat source, and the caliber for improving heat exchange coil adapts it to the heat transfer requirements of above-mentioned heat source, production
The purity of food-grade carbon-dioxide reach 99.99%, and other indexs meet national standard.
In addition, production method simple process provided by the invention, regulation are flexibly, and exchange heat sufficiently, and it is at low cost, actually answer
It is good with effect, meet industrialization production requirements.
In order to further illustrate the present invention, it is described in detail below by following embodiment.
Embodiment 1
The structural schematic diagram of the process units for the food-grade carbon-dioxide that the embodiment of the present invention 1 provides is shown in Figure 1；Its
In, 1 is purifying column, and 2 be hypothermia distillation device, and 3 be heat exchange coil, and 4 be products export, and 5 be liquid CO 2 import, and 6 are
Foreign gas outlet, 7 be gas recovery import, and 8 be the air inlet of heat exchange coil, and 9 be carbon dioxide heat source feedway, and 10 are
Carbon dioxide gas source device, 11 be compression set, and 12 be desulfurizer, and 13 be de- hydrocarbon device, and 14 be the gas outlet of heat exchange coil,
15 be gas-liquid separation device, and 16 be the liquid-phase outlet of gas-liquid separation device, and 17 be decompression cooling device, and 18 go out for gas recovery
Mouthful.The caliber of heat exchange coil described in the process units of the food-grade carbon-dioxide is 100mm.
The course of work of the process units of the food-grade carbon-dioxide is as follows：
(1) atmospheric carbon dioxide is successively compressed to 2.3MPa~2.5MPa through compression set by carbon dioxide gas source device,
Desulfurizer desulfurization takes off hydrocarbon device and takes off hydrocarbon to total hydrocarbon content < 20ppm, heat source gas is obtained, by changing to sulfur content < 0.1ppm
The air inlet of hot coil enters heat exchange coil.
(2) the heat source gas temperature in heat exchange coil is 35 DEG C ± 5 DEG C, and flow control is in 1000Nm3/ h, and by liquid two
Carbonoxide import enters the liquid CO 2 to be purified that the temperature of purifying column is -15 DEG C~-20 DEG C and exchanges heat, heat exchange
Gas-liquid volume flow ratio is preferably 350：1, cryogenic rectification is carried out under the pressure of 2.2MPa~2.3MPa, respectively obtains impurity gas
Heat source gas and food-grade carbon-dioxide after body, cooling；Wherein, the foreign gas is exported by foreign gas and is exported, described
Heat source gas after cooling is exported by the gas outlet of heat exchange coil, and the food-grade carbon-dioxide is exported by products export.
Through detecting, the purity of the food-grade carbon-dioxide reaches 99.99%；And according to《National food safety standard food
Additive carbon dioxide-GB 1886228-2016》Organoleptic requirements to the food-grade carbon-dioxide being prepared and physics and chemistry respectively
Performance is detected；Wherein, the color of the food-grade carbon-dioxide, aroma and flavor meet the requirements, the detection of physicochemical property
As a result ginseng is shown in Table 1.
The physicochemical property data for the food-grade carbon-dioxide that 1 embodiment of the present invention 1 of table provides
As shown in Table 1, the every physicochemical property for the food-grade carbon-dioxide that the embodiment of the present invention 1 provides meets national mark
It is quasi-.
(3) it has partial CO 2 in the foreign gas of foreign gas outlet output to escape in gaseous form, through depressurizing
After cooling device carries out decompression cooling, recovered gas feed enters purifying column, then is exported and exported by gas recovery, realizes dioxy
Change carbon recycling；Meanwhile by the temperature of the gas outlet of heat exchange coil output being the heat source gas after -5 DEG C~5 DEG C of cooling, through gas
Liquid separating apparatus carries out gas-liquid separation, and obtaining liquid CO 2 can be used as liquid to be purified as described in the above technical scheme
Carbon dioxide repeats above-mentioned purification process.
The above description of the disclosed embodiments, enables those skilled in the art to implement or use the present invention.It is right
A variety of modifications of these embodiments will be readily apparent to those skilled in the art, and as defined herein one
As principle can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention will
It will not be intended to be limited to the embodiments shown herein, and be to fit to consistent with the principles and novel features disclosed herein
Widest scope.
Claims (10)
1. a kind of process units of food-grade carbon-dioxide, including：
Purifying column；Hypothermia distillation device and heat exchange coil are successively arranged inside the purifying column from top to bottom, bottom is equipped with product
Outlet, top are respectively equipped with liquid CO 2 import and foreign gas outlet；The hypothermia distillation device is equipped with gas recovery
Import；The caliber of the heat exchange coil is 100mm~200mm；
The carbon dioxide heat source feedway being connected with the air inlet of the heat exchange coil；The carbon dioxide heat source feedway
Including carbon dioxide gas source device, compression set, desulfurizer and the de- hydrocarbon device being sequentially connected；The gas of the de- hydrocarbon device
Outlet is communicated with the air inlet of the heat exchange coil；
The gas-liquid separation device being connected with the gas outlet of the heat exchange coil；The liquid-phase outlet of the gas-liquid separation device with it is described
Liquid CO 2 import communicates；
Decompression cooling device between the foreign gas outlet and gas recovery import is set.
2. process units according to claim 1, which is characterized in that the hypothermia distillation device is additionally provided with gas recovery and goes out
Mouthful.
3. a kind of production method of food-grade carbon-dioxide, using the described in any item process units of claim 1~2, including
Following steps：
A) atmospheric carbon dioxide is successively compressed, desulfurization and de- hydrocarbon, obtains heat source gas；
B) after the heat source gas for obtaining step a) and liquid CO 2 to be purified exchange heat, cryogenic rectification is carried out, respectively
Heat source gas and food-grade carbon-dioxide after to foreign gas, cooling；The caliber of heat exchange coil used in the heat transfer process
For 100mm~200mm；
C) carbon dioxide in foreign gas that step b) is obtained is recycled, while the heat source gas after cooling is subjected to gas
Liquid separation obtains the purification process that liquid CO 2 to be purified repeats step b).
4. production method according to claim 3, which is characterized in that the pressure of compression described in step a) be 2MPa~
3MPa。
5. production method according to claim 3, which is characterized in that the sulfur content of desulfurization described in step a) be less than etc.
In 0.2ppm；The total hydrocarbon content of the de- hydrocarbon is less than or equal to 25ppm.
6. production method according to claim 3, which is characterized in that the temperature of heat source gas described in step b) is 30 DEG C
~40 DEG C, flow 900Nm3/ h~1100Nm3/h。
7. production method according to claim 3, which is characterized in that liquid CO 2 to be purified described in step b)
Temperature be -15 DEG C~-20 DEG C.
8. production method according to claim 3, which is characterized in that the gas-liquid volume flow ratio of heat exchange described in step b)
For (200~500)：1.
9. production method according to claim 3, which is characterized in that the pressure of cryogenic rectification described in step b) is
2.1MPa~2.4MPa.
10. production method according to claim 3, which is characterized in that the heat source gas after cooling down described in step c)
Temperature is -5 DEG C~5 DEG C.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103058188A (en) * | 2012-12-31 | 2013-04-24 | 安庆凯美特气体有限公司 | Method for reducing carbon dioxide discharge amount in food-grade liquid carbon dioxide product production |
| WO2015060878A1 (en) * | 2013-10-25 | 2015-04-30 | Air Products And Chemicals, Inc. | Purification of carbon dioxide |
| CN106315545A (en) * | 2015-07-03 | 2017-01-11 | 安徽华尔泰化工股份有限公司 | Processing technique of liquid carbon dioxide by decarbonizing and resolving synthetic ammonia |
| CN107174832A (en) * | 2017-06-15 | 2017-09-19 | 重庆川茂化工科技有限公司 | Gas purification high-purity distillation technology and equipment |
-
2018
- 2018-08-17 CN CN201810942742.4A patent/CN108821289B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103058188A (en) * | 2012-12-31 | 2013-04-24 | 安庆凯美特气体有限公司 | Method for reducing carbon dioxide discharge amount in food-grade liquid carbon dioxide product production |
| WO2015060878A1 (en) * | 2013-10-25 | 2015-04-30 | Air Products And Chemicals, Inc. | Purification of carbon dioxide |
| CN106315545A (en) * | 2015-07-03 | 2017-01-11 | 安徽华尔泰化工股份有限公司 | Processing technique of liquid carbon dioxide by decarbonizing and resolving synthetic ammonia |
| CN107174832A (en) * | 2017-06-15 | 2017-09-19 | 重庆川茂化工科技有限公司 | Gas purification high-purity distillation technology and equipment |
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