CN218452168U - Device for preparing methanol from carbon dioxide - Google Patents
Device for preparing methanol from carbon dioxide Download PDFInfo
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- CN218452168U CN218452168U CN202220634556.6U CN202220634556U CN218452168U CN 218452168 U CN218452168 U CN 218452168U CN 202220634556 U CN202220634556 U CN 202220634556U CN 218452168 U CN218452168 U CN 218452168U
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Abstract
The utility model relates to a carbon dioxide system methyl alcohol device, including first reactor, the first gas heat exchanger of second reactor, first cooler, first separator, second gas heat exchanger, second cooler, second separator. The utility model adopts the series flow of two-stage reactors, and simultaneously produces steam as a byproduct, and the cooling and liquid separating device at the outlet of the first reactor can reduce the alcohol partial pressure and the water partial pressure at the inlet of the second reactor, thereby being beneficial to improving the methanol conversion rate of the second reactor; the utility model separates the unreacted gas in the reactor and enters the synthesis reactor for recycling, which is beneficial to improving the total carbon conversion rate of carbon dioxide; the utility model discloses introduce the second reactor with fresh synthetic gas through the bypass, when the first reactor catalyst activity of end reduces in the reaction, will react the back and move to the second reactor to guarantee the conversion and the output of whole device.
Description
Technical Field
The utility model relates to a chemical production technical field specifically indicates a carbon dioxide system methyl alcohol device.
Background
Carbon dioxide is a common greenhouse gas, and in the industrial field of China, particularly industries depending on coal resources, a large amount of CO is generated every year 2 And (4) generating.
In 9 months 2020, china proposes the aim and the vision of' the carbon dioxide emission strives to reach the peak value in 2030 years ago, strives for the goal and the vision of realizing carbon neutralization in 2060 years ago, and relates to the sustainable development of Chinese nationality and the construction of the human fate community, which means that China more firmly carries out the new development concept, constructs the new development pattern, promotes the transformation and the upgrade of the industry, walks up the development path of green, low carbon and circulation, realizes the high-quality development, and has very practical and important significance for protecting the earth ecology and promoting the action of responding to the climate change globally.
The concept of 'methanol economy' is proposed in 2005 by george, andrew and Euler of Nobel prize-winning chemists, and the methanol economy can be used as a solution for solving the problem of later energy in the oil and gas era. It is considered that hydrogen is produced from renewable energy sources, and carbon dioxide is recycled to synthesize methanol, which can be directly used as fuel, or synthesized into fuel or chemicals through processes of methanol-to-gasoline (MTG), methanol-to-aromatics (MTA), methanol-to-olefin (MTO), and methanol-to-propylene (MTP), and is a promising technology.
At present, a plurality of scientific research institutions and colleges in China collate CO 2 Catalyst for preparing methanol and CO 2 The methanol preparation technology is developed and matured, and plays a positive promoting role in national carbon peak reaching and carbon neutralization targets. Compared with the preparation of methanol from carbon monoxide, the preparation of methanol from carbon dioxide mainly depends on the use of a catalyst and the control of reaction temperature.
The existing catalyst preparation technology can meet the industrial requirement of preparing methanol from carbon dioxide. For example, patent application publication No. CN110975938A discloses a catalyst for preparing methanol by carbon dioxide hydrogenation and a preparation method thereof, wherein a metal organic framework material MIL-101 (Cr) -NH with modified framework is adopted 2 As a carrier, the shape selection selectivity of the pore channel structure of MIL-101 (Cr) is utilized to improve the selectivity of methanol; meanwhile, the MIL-101 (Cr) has high specific surface area and is used for CO 2 Has high adsorption capacity and effectively improves CO 2 Catalytic selectivity of (2). Chinese patent No. CN110833843B discloses a catalyst for synthesizing methanol by carbon dioxide hydrogenation, which uses molybdenum disulfide as a main component of a catalyst for synthesizing methanol by carbon dioxide hydrogenation, and the catalyst for preparing methanol by carbon dioxide hydrogenation has the characteristics of low price, simple operation, high carbon dioxide conversion rate, high methanol selectivity in products, good stability and the like.
The patent application with publication number CN105622344A discloses a process for preparing methanol from carbon dioxide, which adopts a single-stage reactor and a hydrogen-carbon ratio (H) 2 /CO 2 ) In the range of 2.0 to 3.0, adopting CO 2 Reverse steam shift, methanol synthesis reaction and gas recycling process. Application publication No. CN113045383A, using a single stage reactor, hydrogen to carbon ratio (H) 2 +CO)/(CO+CO 2 ) Is 3.05 to 3.1, which introduces CO and therefore approaches the traditional methanol manufacturing process. The existing process for preparing methanol from carbon dioxide mostly adopts a first-stage reactor and a cooling and separating process, has low total carbon conversion rate, large energy consumption of a device, low methanol content of a product and subsequent rectificationThe load of the energy-saving device is large, and the comprehensive energy consumption is high.
Disclosure of Invention
The utility model aims to solve the technical problem that the current situation to prior art provides a carbon dioxide system methyl alcohol device that total carbon conversion is high, device total energy consumption is low.
The utility model provides a technical scheme that above-mentioned technical problem adopted does:
a device for preparing methanol from carbon dioxide comprises:
the first reactor is used for preparing methanol from carbon dioxide for reaction; the top of the first reactor is provided with an inlet for inputting a first reaction raw material, and the bottom of the first reactor is provided with an outlet for outputting a first reaction product;
the second reactor is used for preparing methanol from carbon dioxide for reaction; the top of the second reactor is provided with an inlet for inputting a second reaction raw material and an output port for outputting a gas phase, and the bottom of the second reactor is provided with an outlet for outputting a second reaction product and an input port for inputting cold synthesis gas; the output port is connected with the top inlet of the first reactor;
the first gas-gas heat exchanger is connected to the outlet of the first reactor;
the first cooler is connected with the first outlet of the first gas-gas heat exchanger;
the first separator is connected with the downstream of the first cooler and is used for carrying out gas-liquid separation on the reaction liquid output by the first reactor; the top outlet of the first separator is connected with the inlet of the first gas-gas heat exchanger;
the second gas-gas heat exchanger is connected to a pipeline between the output port of the second reactor and the inlet of the first reactor, and the second outlet of the first gas-gas heat exchanger is connected with the inlet of the second reactor through the second gas-gas heat exchanger;
the second cooler is connected with the outlet of the second reactor; and
the second separator is connected with the downstream of the second cooler and is used for carrying out gas-liquid separation on the reaction liquid output by the second reactor; and the top outlet of the second separator is connected with the input port of the second reactor.
Preferably, a feed line is connected to the input at the bottom of the second reactor, the gas phase produced at the top of the second separator is fed as recycle gas into the feed line via a first junction, and fresh synthesis gas is fed into the feed line via a second junction.
Preferably, a first return pipeline is connected between the output port at the top of the second reactor and the inlet at the top of the first reactor, and the second gas-gas heat exchanger is arranged on the first return pipeline; a second return pipeline passing through the second gas-gas heat exchanger is connected between the second outlet of the first gas-gas heat exchanger and the top inlet of the second reactor, a bypass line is connected between the feeding pipeline and the second return pipeline, and a valve used for controlling the opening of the bypass line according to the temperature is arranged on the bypass line.
Preferably, the connection between the bypass line and the feed line is between the first junction and the second junction, and the connection between the bypass line and the second return line is between the second gas-gas heat exchanger and the second reactor.
Preferably, the input of the fresh synthesis gas is provided with a first compressor, and the input of the recycle gas is provided with a second compressor.
Preferably, the top of the first reactor is connected with a steam drum, and the steam drum is provided with a pipeline for inputting boiler water, an output pipeline for inputting steam and a third return pipeline for returning liquid phase to the first reactor.
This can be seen from the following equation: the preparation of methanol from carbon dioxide is an exothermic reaction, the preparation of methanol from carbon dioxide consumes more hydrogen and generates more water than the traditional preparation of methanol from carbon monoxide, and one water is generated simultaneously when one part of methanol is generated.
CO 2 +3H 2 ≒CH 3 OH+H 2 O
CO+2H 2 ≒CH 3 OH
The utility model discloses directly introduce the second reactor entry with partial fresh gas, reduce the entry temperature of second reactor, improve carbon dioxide and hydrogen partial pressure, be favorable to improving second reactor entry driving force to further improve the interior methanol conversion rate of second reactor.
The utility model discloses in, set up gas heat exchanger in the middle of first reactor and the second reactor, utilize to export high-temperature gas to preheat second reactor entry gas to first reactor, utilize second reactor export high-temperature gas to preheat first reactor entry gas, the reaction heat has obtained rational utilization.
Compared with the prior art, the utility model has the advantages of: the utility model adopts the two-stage reactor series flow, and simultaneously produces steam as a byproduct, and the cooling and liquid separating device at the outlet of the first reactor can reduce the alcohol partial pressure and the water partial pressure at the inlet of the second reactor, thereby being beneficial to improving the methanol conversion rate of the second reactor; the utility model separates the unreacted gas in the reactor and enters the synthesis reactor for recycling, which is beneficial to improving the total carbon conversion rate of carbon dioxide; the utility model discloses introduce the second reactor with fresh synthetic gas through the bypass, when the first reactor catalyst activity in reaction middle and final stage reduces, will react the back and move to the second reactor to guarantee the conversion and the output of whole device.
Drawings
Fig. 1 is a process flow diagram of the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1, the carbon dioxide-to-methanol apparatus of the present embodiment includes:
a first reactor 1 for preparing methanol from carbon dioxide; the top of the first reactor 1 is provided with an inlet for inputting a first reaction raw material, and the bottom is provided with an outlet for outputting a first reaction product; the first reaction raw material is a gas phase from the top of the second reactor 2 and subjected to heat exchange through a second gas-gas heat exchanger;
the second reactor 2 is used for preparing methanol from carbon dioxide for reaction; the top of the second reactor 2 is provided with an inlet for inputting a second reaction raw material and an output port for outputting a gas phase, and the bottom is provided with an outlet for outputting a second reaction product and an input port for inputting cold synthesis gas; the output port is connected with the top inlet of the first reactor 1; the second reaction raw material is a gas phase obtained after the first reaction product is subjected to liquid separation and heat exchange through the first gas-gas heat exchanger 10 and the second gas-gas heat exchanger 20;
a first gas-gas heat exchanger 10 connected to the outlet of the first reactor 1;
a first cooler 100 connected to a first outlet of the first gas-gas heat exchanger 10;
a first separator 01 connected to a downstream of the first cooler 100 for gas-liquid separation of the reaction liquid output from the first reactor 1; the top outlet of the first separator 01 is connected with the inlet of the first gas-gas heat exchanger 10;
the second gas-gas heat exchanger 20 is connected to a pipeline between the output port of the second reactor 2 and the inlet of the first reactor 1, and the second outlet of the first gas-gas heat exchanger 10 is connected with the inlet of the second reactor 2 through the second gas-gas heat exchanger 20;
a second cooler 200 connected to an outlet of the second reactor 2;
a second separator 02 connected to a downstream of the second cooler 200, for performing gas-liquid separation of the reaction liquid output from the second reactor 2; the top outlet of the second separator 02 is connected to the inlet of the second reactor 2.
In this embodiment, a feed line 201 is connected to the input at the bottom of the second reactor 2, the gaseous phase produced at the top of the second separator 02 is fed as recycle gas into the feed line 201 through a first junction, and fresh synthesis gas is fed into the feed line 201 through a second junction.
A first return pipeline 101 is connected between the output port at the top of the second reactor 1 and the inlet at the top of the first reactor 1, and the second gas-gas heat exchanger 20 is arranged on the first return pipeline 101; a second return pipeline 102 passing through the second gas-gas heat exchanger 20 is connected between the second outlet of the first gas-gas heat exchanger 10 and the top inlet of the second reactor 2, a bypass line 103 is connected between the feeding pipeline 201 and the second return pipeline 102, and a valve 104 for controlling the opening degree of the bypass line 103 according to the temperature is arranged on the bypass line 103. The junction between the bypass line 103 and the feed line 201 is located between the first junction and the second junction, and the junction between the bypass line 103 and the second return line 102 is located between the second gas-gas heat exchanger 20 and the second reactor 2.
The input of the fresh synthesis gas is provided with a first compressor 03 and the input of the recycle gas is provided with a second compressor 04.
The top of the first reactor 1 is connected with a steam drum 05, and the steam drum 05 is provided with a pipeline for inputting boiler water, an output pipeline for inputting steam and a third return pipeline for returning a liquid phase to the first reactor 1.
This can be seen from the following equation: the preparation of methanol from carbon dioxide is an exothermic reaction, the preparation of methanol from carbon dioxide consumes more hydrogen and generates more water than the traditional preparation of methanol from carbon monoxide, and one water is generated simultaneously when one part of methanol is generated.
CO 2 +3H 2 ≒CH 3 OH+H 2 O
CO+2H 2 ≒CH 3 OH
In this embodiment, a part of the fresh gas is directly introduced into the inlet of the second reactor 2, so as to reduce the inlet temperature of the second reactor 2, increase the partial pressure of carbon dioxide and hydrogen, and facilitate the improvement of the driving force of the inlet of the second reactor, thereby further improving the conversion rate of methanol in the second reactor 2. The gas-gas heat exchanger is arranged between the first reactor 1 and the second reactor 2, the inlet gas of the second reactor 2 is preheated by utilizing the high-temperature gas at the outlet of the first reactor, the inlet gas of the first reactor 1 is preheated by utilizing the high-temperature gas at the outlet of the second reactor 2, and the reaction heat is reasonably utilized.
Claims (6)
1. A device for preparing methanol from carbon dioxide is characterized by comprising:
the first reactor is used for preparing methanol from carbon dioxide; the top of the first reactor is provided with an inlet for inputting a first reaction raw material, and the bottom of the first reactor is provided with an outlet for outputting a first reaction product;
the second reactor is used for preparing methanol from carbon dioxide for reaction; the top of the second reactor is provided with an inlet for inputting a second reaction raw material and an output port for outputting a gas phase, and the bottom of the second reactor is provided with an outlet for outputting a second reaction product and an input port for inputting cold synthesis gas; the output port is connected with the top inlet of the first reactor;
the first gas-gas heat exchanger is connected to the outlet of the first reactor;
the first cooler is connected with the first outlet of the first gas-gas heat exchanger;
the first separator is connected with the downstream of the first cooler and is used for carrying out gas-liquid separation on the reaction liquid output by the first reactor; the top outlet of the first separator is connected with the inlet of the first gas-gas heat exchanger;
the second gas-gas heat exchanger is connected to a pipeline between the output port of the second reactor and the inlet of the first reactor, and a second outlet of the first gas-gas heat exchanger is connected with the inlet of the second reactor through the second gas-gas heat exchanger;
the second cooler is connected with the outlet of the second reactor; and
the second separator is connected with the downstream of the second cooler and is used for carrying out gas-liquid separation on the reaction liquid output by the second reactor; and the top outlet of the second separator is connected with the input port of the second reactor.
2. The apparatus for producing methanol from carbon dioxide according to claim 1, characterized in that: and a feeding pipeline is connected to the input port at the bottom of the second reactor, the gas phase produced at the top of the second separator is input into the feeding pipeline through a first joint as circulating gas, and fresh synthesis gas is input into the feeding pipeline through a second joint.
3. The apparatus for producing methanol from carbon dioxide according to claim 2, characterized in that: a first return pipeline is connected between an output port at the top of the second reactor and an inlet at the top of the first reactor, and the second gas-gas heat exchanger is arranged on the first return pipeline; and a second return pipeline passing through the second gas-gas heat exchanger is connected between the second outlet of the first gas-gas heat exchanger and the top inlet of the second reactor, a bypass line is connected between the feeding pipeline and the second return pipeline, and a valve used for controlling the opening of the bypass line according to the temperature is arranged on the bypass line.
4. The apparatus for producing methanol from carbon dioxide according to claim 3, characterized in that: the connection between the bypass line and the feed line is positioned between the first joint and the second joint, and the connection between the bypass line and the second return line is positioned between the second gas-gas heat exchanger and the second reactor.
5. The apparatus for producing methanol from carbon dioxide according to claim 2, characterized in that: and a first compressor is arranged at the input part of the fresh synthesis gas, and a second compressor is arranged at the input part of the circulating gas.
6. The apparatus for producing methanol from carbon dioxide according to any one of claims 1 to 4, characterized in that: the top of the first reactor is connected with a steam drum, and the steam drum is provided with a pipeline for inputting boiler water, an output pipeline for inputting steam and a third return pipeline for feeding a liquid phase to return to the first reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220634556.6U CN218452168U (en) | 2022-03-23 | 2022-03-23 | Device for preparing methanol from carbon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220634556.6U CN218452168U (en) | 2022-03-23 | 2022-03-23 | Device for preparing methanol from carbon dioxide |
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| Publication Number | Publication Date |
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| CN218452168U true CN218452168U (en) | 2023-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220634556.6U Active CN218452168U (en) | 2022-03-23 | 2022-03-23 | Device for preparing methanol from carbon dioxide |
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