CN111484014A - Carbon dioxide production device and method - Google Patents
Carbon dioxide production device and method Download PDFInfo
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- CN111484014A CN111484014A CN202010566554.3A CN202010566554A CN111484014A CN 111484014 A CN111484014 A CN 111484014A CN 202010566554 A CN202010566554 A CN 202010566554A CN 111484014 A CN111484014 A CN 111484014A
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Abstract
The invention discloses a carbon dioxide production device and a method, wherein the production device comprises a compressor, a cooler and a liquefier; the device also comprises a reaction kettle, a leaching tower, a dehydrating tower, an adsorption tower and a rectifying tower; the side of the reaction kettle is provided with a material inlet and an acid liquor inlet, the bottom of the reaction kettle is provided with a liquid discharge pipe, and the top of the reaction kettle is provided with an exhaust pipe. The production method of the carbon dioxide comprises the steps of preparation, leaching, compression cooling, dehydration adsorption, liquefaction rectification and the like. The invention has simple process and convenient operation; the invention recycles the carbon dioxide generated in the calcium nitrate preparation process and obtains pure carbon dioxide; not only avoids the influence of carbon dioxide on the environment, but also recycles the carbon dioxide.
Description
Technical Field
The invention relates to the technical field of gas processing, in particular to a carbon dioxide production device and a carbon dioxide production method.
Background
Calcium nitrate is a commonly used compound, is used as a quick-acting fertilizer for acid soil in agriculture, is a main component of a plant soilless culture nutrient solution, and provides nitrogen and calcium elements required by plant growth. The industrial application is mainly to prepare metal surface phosphating solution which is the main raw material of zinc and calcium phosphating concentrated solution; it is used as mordant for fabric dyeing, flocculant in rubber industry, and for making fireworks and electronic tubes. And calcium nitrate is also a raw material for producing calcium ammonium nitrate.
Calcium nitrate is produced by reacting calcium carbonate with nitric acid, often using an acid-base neutralization process. Carbon dioxide is released during the reaction. Carbon dioxide (CO)2) Is a major source of greenhouse gases. Excessive emission of carbon dioxide has caused global warming and glaciers to melt. But carbon dioxide is oneThe material is used as refrigerant, food additive, fire extinguisher, chemical material, oil and gas producing material, agricultural production, etc. If the carbon dioxide is collected, recovered, stored and applied, the utilization of carbon resources is improved, and the emission of greenhouse gases can be effectively reduced.
In the production process of calcium nitrate preparation, the recovery and utilization of carbon dioxide are not involved, so a device suitable for calcium nitrate byproduct carbon dioxide is needed to recover and utilize carbon dioxide.
Disclosure of Invention
The invention aims to overcome the defects and provide a carbon dioxide production device and a carbon dioxide production method. In order to achieve the purpose, the invention is implemented according to the following technical scheme:
a carbon dioxide production device comprises a compressor, a cooler and a liquefier; the device also comprises a reaction kettle, a leaching tower, a dehydrating tower, an adsorption tower and a rectifying tower;
the side surface of the reaction kettle is provided with a material inlet and an acid liquor inlet, the bottom of the reaction kettle is provided with a liquid discharge pipe, and the top of the reaction kettle is provided with an exhaust pipe;
the exhaust pipe of the reaction kettle is communicated with the gas inlet of the leaching tower; a gas outlet at the top of the leaching tower is communicated with a gas inlet of the compressor; the gas outlet of the compressor is communicated with the inlet of the cooler; the outlet of the cooler is communicated with the inlet at the bottom of the dehydration tower; an outlet at the top of the dehydration tower is communicated with an inlet at the top of the adsorption tower; an outlet at the bottom of the adsorption tower is communicated with an inlet of the liquefier; the outlet of the liquefier is communicated with the inlet of the rectifying tower.
Preferably, two spraying layers are arranged in the leaching tower; the eluent at the bottom of the leaching tower is sent into a spraying layer through a circulating pump; the bottom side surface of the leaching tower is provided with a circulating liquid inlet pipe and a waste liquid discharge pipe.
Preferably, the dehydration tower adopts a molecular sieve for dehydration; the adsorption tower adopts active carbon for adsorption.
A method for producing carbon dioxide comprising the steps of:
s1, feeding calcium carbonate and dilute nitric acid into the reaction kettle from a material inlet and an acid liquor inlet of the reaction kettle respectively for reaction; discharging carbon dioxide generated by the reaction from a reaction kettle exhaust pipe; discharging the reaction liquid after the reaction of the calcium carbonate and the dilute nitric acid from a liquid discharge pipe;
s2, allowing carbon dioxide gas to enter the elution tower from a gas inlet of the elution tower, and discharging the carbon dioxide gas from an outlet of the elution tower after washing;
s3, feeding the washed carbon dioxide gas into a compressor to obtain compressed carbon dioxide gas; the compressed carbon dioxide gas enters a cooling machine to obtain cooled carbon dioxide gas;
s4, the cooled carbon dioxide gas enters a dehydration tower for dehydration and then enters an adsorption tower for adsorption treatment; obtaining purified carbon dioxide gas;
s5, the purified carbon dioxide gas enters a liquefier, and a carbon dioxide liquid phase is separated to obtain a carbon dioxide liquid; and (4) rectifying the carbon dioxide gas in a rectifying tower to obtain pure carbon dioxide.
Preferably, in step S2, the leacheate in the leaching tower is a sodium bicarbonate solution, and the spraying density is 15-20L/m2·h。
Preferably, in the step S3, the pressure of the carbon dioxide gas is 1 to 1.5MPa during the compression process; and the temperature of the cooled carbon dioxide gas is 20-35 ℃.
Preferably, the pressure of the dehydration and adsorption process in the step S4 is 1-1.5 MPa, and the temperature is 20-35 ℃.
The invention has the following function principle:
the method recovers and treats the byproduct carbon dioxide gas generated in the production process of calcium nitrate to obtain pure carbon dioxide.
The reaction kettle is used for the reaction of dilute nitric acid and calcium carbonate, and the byproduct carbon dioxide after the reaction is discharged from a gas outlet to start the treatment. And discharging the reaction liquid after the reaction from a liquid discharge pipe at the bottom of the reaction kettle, and further treating the calcium nitrate. Since the reaction of dilute nitric acid and calcium carbonate is exothermic, water vapor and NO are mixed in the generated carbon dioxide2Wait for impurities, can not be directly treatedRecycling, further processing is required. The leaching tower is mainly used for leaching and recovering NO2During the rinsing process, NO2Is absorbed by the leacheate. The leacheate here is mainly sodium bicarbonate solution.
And then the carbon dioxide gas sequentially passes through a compressor, a cooler, a dehydration tower, an adsorption tower, a liquefier and a rectifying tower to obtain pure carbon dioxide. The compressor compresses the carbon dioxide, and the volume of the carbon dioxide gas is reduced after cooling, thereby being beneficial to the next dehydration and adsorption. The water vapor in the carbon dioxide is removed in the dehydration process, and the impurities in the carbon dioxide are removed in the adsorption process. The carbon dioxide is liquefied in the liquefaction process to be carbon dioxide liquid, and part of doped gas can be separated; and rectifying the carbon dioxide liquid to obtain further purified carbon dioxide.
Compared with the prior art, the invention has the beneficial effects that:
the invention has simple process and convenient operation; the invention recycles the carbon dioxide generated in the calcium nitrate preparation process and obtains pure carbon dioxide; not only avoids the influence of carbon dioxide on the environment, but also recycles the carbon dioxide.
Drawings
Fig. 1 is a schematic diagram of a carbon dioxide production apparatus of example 1.
In the figure: 1. a reaction kettle; 2. leaching the tower; 3. a compressor; 4. a cooling machine; 5. a dehydration tower; 6. an adsorption tower; 7. a rectifying tower; 8. a spray layer; 9. a circulation pump; 10. a circulating liquid inlet pipe; 11. a waste liquid calandria; 12. a material inlet; 13. an acid liquor inlet; 14. a liquid discharge pipe; 15. an exhaust pipe; 16. a liquefier.
Detailed Description
The present invention will be further described with reference to specific examples, which are illustrative of the invention and are not to be construed as limiting the invention.
Example 1
As shown in fig. 1, a carbon dioxide production apparatus includes a compressor 3, a cooler 4, a liquefier 16; the device also comprises a reaction kettle 1, a leaching tower 2, a dehydrating tower 5, an adsorption tower 6 and a rectifying tower 7.
The side of the reaction kettle 1 is provided with a material inlet 12 and an acid liquor inlet 13, the bottom of the reaction kettle 1 is provided with a liquid discharge pipe 14, and the top of the reaction kettle 1 is provided with an exhaust pipe 15.
The exhaust pipe 15 of the reaction kettle 1 is communicated with the gas inlet of the leaching tower 2; a gas outlet at the top of the leaching tower 2 is communicated with a gas inlet of the compressor 3; the gas outlet of the compressor 3 is communicated with the inlet of the cooler 4; the outlet of the cooler 4 is communicated with the inlet at the bottom of the dehydrating tower 5; an outlet at the top of the dehydrating tower 5 is communicated with an inlet at the top of the adsorption tower 6; an outlet at the bottom of the adsorption tower 6 is communicated with an inlet of a liquefier 16; the outlet of the liquefier 16 communicates with the inlet of the rectification column 7.
Two spraying layers 8 are arranged in the leaching tower 2; the leacheate at the bottom of the leaching tower 2 is sent into a spraying layer 8 through a circulating pump 9; the side surface of the bottom of the leaching tower 2 is provided with a circulating liquid inlet pipe 10 and a waste liquid discharge pipe 11.
The dehydration tower 5 adopts a molecular sieve for dehydration; the adsorption tower 6 adopts active carbon for adsorption.
Example 2
A method for producing carbon dioxide comprising the steps of:
s1, feeding calcium carbonate and dilute nitric acid into the reaction kettle from a material inlet and an acid liquor inlet of the reaction kettle respectively for reaction; discharging carbon dioxide generated by the reaction from a reaction kettle exhaust pipe; discharging the reaction liquid after the reaction of the calcium carbonate and the dilute nitric acid from a liquid discharge pipe; the concentration of the dilute nitric acid is 35 wt%;
s2, introducing carbon dioxide gas into the leaching tower from a gas inlet of the leaching tower, washing the carbon dioxide gas, and discharging the carbon dioxide gas from an outlet of the leaching tower, wherein the leaching solution in the leaching tower is a saturated sodium bicarbonate solution, and the spraying density is 20L/m2·h；
S3, feeding the washed carbon dioxide gas into a compressor to obtain compressed carbon dioxide gas; the compressed carbon dioxide gas enters a cooling machine to obtain cooled carbon dioxide gas; in the compression process, the pressure of the carbon dioxide gas is 1.5 MPa; after cooling, the temperature of carbon dioxide gas is 33-35 ℃;
s4, the cooled carbon dioxide gas enters a dehydration tower for dehydration and then enters an adsorption tower for adsorption treatment; obtaining purified carbon dioxide gas; the pressure in the dehydration and adsorption process is 1.5MPa, and the temperature is 33-35 ℃;
s5, the purified carbon dioxide gas enters a liquefier, and a carbon dioxide liquid phase is separated to obtain a carbon dioxide liquid; and (4) rectifying the carbon dioxide gas in a rectifying tower to obtain pure carbon dioxide.
Example 3
A method for producing carbon dioxide comprising the steps of:
s1, feeding calcium carbonate and dilute nitric acid into the reaction kettle from a material inlet and an acid liquor inlet of the reaction kettle respectively for reaction; discharging carbon dioxide generated by the reaction from a reaction kettle exhaust pipe; discharging the reaction liquid after the reaction of the calcium carbonate and the dilute nitric acid from a liquid discharge pipe; the concentration of the dilute nitric acid is 30 wt%;
s2, introducing carbon dioxide gas into the leaching tower from a gas inlet of the leaching tower, washing the carbon dioxide gas, and discharging the carbon dioxide gas from an outlet of the leaching tower, wherein the leaching solution in the leaching tower is a saturated sodium bicarbonate solution, and the spraying density is 15L/m2·h；
S3, feeding the washed carbon dioxide gas into a compressor to obtain compressed carbon dioxide gas; the compressed carbon dioxide gas enters a cooling machine to obtain cooled carbon dioxide gas; in the compression process, the pressure of carbon dioxide gas is 1 MPa; the temperature of the cooled carbon dioxide gas is 20-22 ℃;
s4, the cooled carbon dioxide gas enters a dehydration tower for dehydration and then enters an adsorption tower for adsorption treatment; obtaining purified carbon dioxide gas; the pressure in the dehydration and adsorption process is 1MPa, and the temperature is 20-22 ℃;
s5, the purified carbon dioxide gas enters a liquefier, and a carbon dioxide liquid phase is separated to obtain a carbon dioxide liquid; and (4) rectifying the carbon dioxide gas in a rectifying tower to obtain pure carbon dioxide.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (7)
1. A carbon dioxide production device comprises a compressor, a cooler and a liquefier; the method is characterized in that: the device also comprises a reaction kettle, a leaching tower, a dehydrating tower, an adsorption tower and a rectifying tower;
the side surface of the reaction kettle is provided with a material inlet and an acid liquor inlet, the bottom of the reaction kettle is provided with a liquid discharge pipe, and the top of the reaction kettle is provided with an exhaust pipe;
the exhaust pipe of the reaction kettle is communicated with the gas inlet of the leaching tower; a gas outlet at the top of the leaching tower is communicated with a gas inlet of the compressor; the gas outlet of the compressor is communicated with the inlet of the cooler; the outlet of the cooler is communicated with the inlet at the bottom of the dehydration tower; an outlet at the top of the dehydration tower is communicated with an inlet at the top of the adsorption tower; an outlet at the bottom of the adsorption tower is communicated with an inlet of the liquefier; the outlet of the liquefier is communicated with the inlet of the rectifying tower.
2. A carbon dioxide production apparatus according to claim 1, characterized in that: two spraying layers are arranged in the leaching tower; the eluent at the bottom of the leaching tower is sent into a spraying layer through a circulating pump; the bottom side surface of the leaching tower is provided with a circulating liquid inlet pipe and a waste liquid discharge pipe.
3. A carbon dioxide production apparatus according to claim 2, characterized in that: the dehydration tower adopts a molecular sieve for dehydration; the adsorption tower adopts active carbon for adsorption.
4. A method for producing carbon dioxide using the production apparatus according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
s1, feeding calcium carbonate and dilute nitric acid into the reaction kettle from a material inlet and an acid liquor inlet of the reaction kettle respectively for reaction; discharging carbon dioxide generated by the reaction from a reaction kettle exhaust pipe; discharging the reaction liquid after the reaction of the calcium carbonate and the dilute nitric acid from a liquid discharge pipe;
s2, allowing carbon dioxide gas to enter the elution tower from a gas inlet of the elution tower, and discharging the carbon dioxide gas from an outlet of the elution tower after washing;
s3, feeding the washed carbon dioxide gas into a compressor to obtain compressed carbon dioxide gas; the compressed carbon dioxide gas enters a cooling machine to obtain cooled carbon dioxide gas;
s4, the cooled carbon dioxide gas enters a dehydration tower for dehydration and then enters an adsorption tower for adsorption treatment; obtaining purified carbon dioxide gas;
s5, the purified carbon dioxide gas enters a liquefier, and a carbon dioxide liquid phase is separated to obtain a carbon dioxide liquid; and (4) rectifying the carbon dioxide gas in a rectifying tower to obtain pure carbon dioxide.
5. The method for producing carbon dioxide according to claim 4, wherein in step S2, the leacheate in the leaching tower is a sodium bicarbonate solution, and the spraying density is 15-20L/m2·h。
6. The carbon dioxide production method according to claim 4, characterized in that: in the step S3, the pressure of the carbon dioxide gas is 1-1.5 MPa in the compression process; and the temperature of the cooled carbon dioxide gas is 20-35 ℃.
7. The carbon dioxide production method according to claim 4, characterized in that: the pressure of the dehydration and adsorption process of the step S4 is 1-1.5 MPa, and the temperature is 20-35 ℃.
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| CN202010566554.3A CN111484014A (en) | 2020-06-19 | 2020-06-19 | Carbon dioxide production device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112892424A (en) * | 2021-01-18 | 2021-06-04 | 陕西科技大学 | Plant calcium supplement and preparation device and preparation method thereof |
Citations (2)
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| CN206203902U (en) * | 2016-11-21 | 2017-05-31 | 交城县三喜化工有限公司 | A kind of reaction unit for producing calcium nitrate liquid |
| CN108423681A (en) * | 2018-02-05 | 2018-08-21 | 杭州快凯高效节能新技术有限公司 | It is a kind of to absorb the carbon trapping qi exhaustion nitre purification technique combined with rectifying |
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- 2020-06-19 CN CN202010566554.3A patent/CN111484014A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206203902U (en) * | 2016-11-21 | 2017-05-31 | 交城县三喜化工有限公司 | A kind of reaction unit for producing calcium nitrate liquid |
| CN108423681A (en) * | 2018-02-05 | 2018-08-21 | 杭州快凯高效节能新技术有限公司 | It is a kind of to absorb the carbon trapping qi exhaustion nitre purification technique combined with rectifying |
Non-Patent Citations (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112892424A (en) * | 2021-01-18 | 2021-06-04 | 陕西科技大学 | Plant calcium supplement and preparation device and preparation method thereof |
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Application publication date: 20200804 |