Methanol synthesis system
By using hydrogen generated by renewable energy and captured carbon dioxide to synthesize methanol under high pressure and high temperature conditions, the problems of large energy consumption and environmental pressure in the prior art have been solved, and the sustainability and economic benefits of methanol production have been improved.
Patent Information
- Application Number
- CN202420935599.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-04-30
AI Technical Summary
The existing methanol synthesis technology has problems such as large energy consumption, low production efficiency, limited raw material sources and high environmental pressure.
Using hydrogen generated by renewable energy combined with captured carbon dioxide, methanol is synthesized by hydrogenation catalytic reaction under high pressure and high temperature conditions, and a high-purity methanol product is obtained through a distillation tower.
The effective recycling of resources has been achieved, the dependence on fossil resources and carbon emissions have been reduced, methanol production efficiency has been improved, and costs have been achieved, achieving the dual improvement of the sustainability and economic benefits of methanol production.
Smart Images
Figure CN222510919U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical equipment, and in particular relates to a system for synthesizing methanol. Background Art
[0002] Alcohol compounds, especially methanol, as a key basic organic chemical raw material, play an indispensable role in many industries. Methanol is not only directly used in many chemical synthesis reactions, but also can be used as a solvent, fuel additive (for example, for gasoline blending to increase octane number or as a raw material for methanol fuel cells), antifreeze, and is the starting material for the production of a series of important derivatives (such as formaldehyde, dimethyl ether, acetic acid, MTBE, etc.), which are then used to produce a variety of chemical products such as plastics, resins, dyes, pharmaceuticals, flavors and fragrances.
[0003] Although the synthesis technology of methanol is quite mature, the traditional synthesis route is usually based on synthesis gas (a mixture of CO and H2), which is carried out under high pressure and high temperature conditions through Fischer-Tropsch synthesis or similar catalytic processes. However, the existing production methods do face some challenges, such as high energy consumption, production efficiency needs to be improved, limited raw material sources, and increased environmental pressure. For example, the production of synthesis gas often relies on steam reforming or coal gasification of fossil fuels, which will produce a large amount of greenhouse gas emissions and have relatively low overall energy efficiency.
[0004] In view of this, the present utility model is proposed. Utility Model Content
[0005] The utility model provides a system for synthesizing methanol in order to solve the technical problems existing in the above-mentioned prior art.
[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a system for synthesizing methanol, comprising a front-end storage device, a buffer tank, a reactor and a rear-end storage device connected in sequence, the front-end storage device comprising a carbon dioxide storage unit and a hydrogen storage unit, the carbon dioxide storage unit and the hydrogen storage unit are respectively connected to the buffer tank; the rear-end storage device comprises a methanol storage unit and a hydrogen storage tank; the methanol storage unit comprises a distillation tower and a methanol storage tank; the hydrogen storage tank is connected to the buffer tank.
[0007] The carbon dioxide storage unit comprises a carbon dioxide capture unit and a carbon dioxide compression unit, and the carbon dioxide compression unit is connected to a buffer tank.
[0008] The hydrogen storage unit comprises a water electrolysis unit, a hydrogen storage unit and a hydrogen compression unit which are connected in sequence, and the water electrolysis unit and the hydrogen compression unit are respectively connected to the buffer tank.
[0009] The hydrogen production pressure in the water electrolysis unit is 1.2MPa-4MPa.
[0010] A combined compressor is provided between the buffer tank and the reactor, and the reactor is connected to the combined compressor.
[0011] A TSA temperature swing adsorption hydrogen purification unit and a PSA hydrogen purification unit are arranged between the reactor and the hydrogen storage tank.
[0012] The working pressure in the buffer tank is 5MPa-6MPa.
[0013] Beneficial effects of the utility model:
[0014] This application uses hydrogen produced by renewable energy combined with captured carbon dioxide to synthesize methanol, which not only achieves effective recycling of resources, but also reduces dependence on fossil resources and carbon emissions, and provides a key direction for improving methanol production efficiency and reducing costs, achieving a dual improvement in the sustainability and economic benefits of methanol production. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the process structure of a system for synthesizing methanol in the utility model;
[0016] The numbers are as follows: 1. Carbon dioxide capture unit; 2. Carbon dioxide compression unit; 3. Water electrolysis unit; 4. Hydrogen storage unit; 5. Hydrogen compression unit; 6. Buffer tank; 7. Combined compressor; 8. Reactor; 9. Distillation tower; 10. Methanol storage tank; 11. Hydrogen storage tank. DETAILED DESCRIPTION
[0017] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.
[0018] like Figure 1 As shown, a system for synthesizing methanol includes a front-end storage device, a buffer tank 6, a reactor 8 and a rear-end storage device connected in sequence, the front-end storage device includes a carbon dioxide storage unit and a hydrogen storage unit, and the carbon dioxide storage unit and the hydrogen storage unit are respectively connected to the buffer tank 6; the rear-end storage device includes a methanol storage unit and a hydrogen storage tank 11, which are used to produce a synthesis gas composed of carbon dioxide and hydrogen, and transport it to the buffer tank 6 for storage; the methanol storage unit includes a distillation tower 9 and a methanol storage tank 10; the hydrogen storage tank 11 is connected to the buffer tank 6, that is, it is used to recover hydrogen for recycling.
[0019] The carbon dioxide storage unit includes a carbon dioxide capture unit 1 and a carbon dioxide compression unit 2, and the carbon dioxide compression unit 2 is connected to a buffer tank 6. The carbon dioxide capture unit 1 can be directly air captured (DAC), specifically, carbon dioxide can be absorbed from the air by chemical solvents or solids that can be combined with carbon dioxide can be used as absorbents to capture carbon dioxide. Carbon dioxide capture and storage (CCS) can also capture and store carbon dioxide in industrial tail gas, and specific capture technologies include chemical absorption, physical separation, oxygen-enriched fuel separation, membrane separation, calcium cycle, chemical cycle, direct separation, supercritical carbon dioxide power cycle, etc.
[0020] The hydrogen storage unit includes a water electrolysis unit 3, a hydrogen storage unit 4 and a hydrogen compression unit 5 which are connected in sequence. The water electrolysis unit 3 and the hydrogen compression unit 5 are respectively connected to a buffer tank 6. The hydrogen production pressure in the water electrolysis unit 3 is 1.2MPa-4MPa. Among them, the main source of green hydrogen can be produced by electrolyzing water using renewable energy, such as solar energy or wind energy.
[0021] A combined compressor 7 is provided between the buffer tank 6 and the reactor 8, and the reactor 8 is connected to the combined compressor 7. A TSA temperature swing adsorption hydrogen purification unit and a PSA hydrogen purification unit are provided between the reactor 8 and the hydrogen storage tank 11. The working pressure in the buffer tank 6 is 5MPa-6MPa.
[0022] Here’s how it works:
[0023] The carbon dioxide from the air or industrial byproducts is captured by the carbon dioxide capture unit 1, compressed by the carbon dioxide compression unit 2 and then transported to the buffer tank 6. The water electrolysis unit 3 uses renewable electricity to electrolyze water to produce hydrogen, which is stored and compressed by the hydrogen storage unit 4 and the hydrogen compression unit 5 and then transported to the buffer tank 6.
[0024] Carbon dioxide and green hydrogen (hydrogen produced by electrolysis of water from renewable energy sources such as wind and solar power) are fully mixed in a buffer tank 6, and a certain temperature and pressure (reaction temperature is about 220°C-300°C, reaction pressure is about 5MPa-6MPa) are controlled for hydrogenation catalytic reaction, and methanol, water and side reaction products are generated through a combined compressor 7 and a reactor 8. Subsequently, gas-liquid separation is performed to obtain a crude methanol product, and finally a high-purity methanol product is obtained by distillation through a distillation tower 9, which is stored in a methanol reserve tank 10 for standby use. Among them, the wastewater generated in the distillation tower 9 can be discharged to the plant biochemical pool as a biological carbon source.
[0025] There is also some hydrogen and carbon dioxide in the side reaction products, which can be used to remove impurities in the purge gas through the TSA temperature swing adsorption hydrogen purification unit and the PSA hydrogen purification unit, and the hydrogen is recovered into the hydrogen storage tank 11, part of which is sent to the catalytic combustion chamber as tail gas for disposal and then discharged after meeting the standards, and part of which is reused in the buffer tank 6. The remaining carbon dioxide can be reused in the combined compressor 7 as circulating gas.
[0026] This application uses hydrogen produced by renewable energy combined with captured carbon dioxide to synthesize methanol, which not only achieves effective recycling of resources, but also reduces dependence on fossil resources and carbon emissions, and provides a key direction for improving methanol production efficiency and reducing costs, achieving a dual improvement in the sustainability and economic benefits of methanol production.
[0027] The above content is a further detailed description of the technical solution provided in combination with the preferred implementation methods of this patent. It cannot be determined that the specific implementation of the utility model is limited to the above descriptions. For ordinary technicians in the technical field to which this patent belongs, without departing from the concept of this patent, they can also make several simple deductions or substitutions, which should be deemed to fall within the scope of protection of this patent.
Claims
1. A system for synthesizing methanol, characterized in that: It includes a front-end storage device, a buffer tank, a reactor and a rear-end storage device connected in sequence. The front-end storage device includes a carbon dioxide storage unit and a hydrogen storage unit, and the carbon dioxide storage unit and the hydrogen storage unit are respectively connected to a buffer tank; The rear-end storage device includes a methanol storage unit and a hydrogen storage tank; The methanol reserve unit comprises a distillation tower and a methanol reserve tank; The hydrogen storage tank is connected to the buffer tank.
2. A system for synthesizing methanol as claimed in claim 1, characterized in that: The carbon dioxide storage unit comprises a carbon dioxide capture unit and a carbon dioxide compression unit, and the carbon dioxide compression unit is connected to a buffer tank.
3. A system for synthesizing methanol as claimed in claim 1, characterized in that: The hydrogen storage unit comprises a water electrolysis unit, a hydrogen storage unit and a hydrogen compression unit which are connected in sequence, and the water electrolysis unit and the hydrogen compression unit are respectively connected to the buffer tank.
4. A system for synthesizing methanol as claimed in claim 3, characterized in that: The hydrogen production pressure in the water electrolysis unit is 1.2MPa-4MPa.
5. A system for synthesizing methanol as claimed in claim 1, characterized in that: A combined compressor is provided between the buffer tank and the reactor, and the reactor is connected to the combined compressor.
6. A system for synthesizing methanol as claimed in claim 1, characterized in that: A TSA temperature swing adsorption hydrogen purification unit and a PSA hydrogen purification unit are arranged between the reactor and the hydrogen storage tank.
7. A system for synthesizing methanol as claimed in claim 1, characterized in that: The working pressure in the buffer tank is 5MPa-6MPa.