Post-treatment process method for green electricity co-production of urea-green ammonia mixture
By using iron-based catalysts in the catalytic distillation tower for catalytic reaction and separation processes, the problems of low separation efficiency and high energy consumption in traditional separation methods are solved, and efficient separation between urea and chlorammonia and comprehensive utilization of resources are achieved, with significant economic and environmental benefits.
Patent Information
- Application Number
- CN202411883171.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-05-06
AI Technical Summary
The traditional separation method of urea and chloramide has problems such as low separation efficiency, large energy consumption and high cost. Especially in the recycling process of high-purity biurea or chloramide, how to efficiently and accurately separate and achieve comprehensive utilization of resources has become a problem that needs to be solved by current technology.
The catalytic reaction was carried out in a catalytic distillation column using an iron-based catalyst, and the green-electric urea-green ammonia mixture was reacted with a carbon-containing raw material to produce a product containing biuret and green ammonia, and the green ammonia and biuret were separated by the first and second distillations.
It realizes efficient separation of urea and chlorammonia, improves the comprehensive utilization rate of resources, reduces energy consumption and costs, and has significant economic and environmental benefits.
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of green chemical industry, and in particular to a post-processing process method for a green electricity co-produced urea-green ammonia mixture. Background Art
[0002] With the transformation of the global energy structure and increasingly stringent environmental protection requirements, the production of green electricity and green chemicals has become an important direction for current industrial development. In the field of nitrogen fertilizer production, the traditional urea production process relies on fossil energy and high-emission processes, which not only consumes a lot of energy, but also imposes a heavy burden on the environment. Therefore, the "green electricity co-production of urea" technology based on renewable energy came into being. By using green electricity (such as wind power, photovoltaics, etc.) as an energy source and combining it with the concept of sustainable development, it can not only reduce carbon emissions but also improve resource utilization efficiency.
[0003] In the production process of green power cogeneration of urea, the mixture of urea and green ammonia as an intermediate product often needs to be further separated to achieve the recovery and purification of urea and green ammonia. In this process, the separation of urea and green ammonia faces technical challenges. Traditional separation methods such as distillation and extraction have problems such as low separation efficiency, high energy consumption, and high cost. Especially in the recovery process of high-purity biuret or green ammonia, how to efficiently and accurately separate and realize the comprehensive utilization of resources has become a difficult problem that needs to be solved urgently in current technology.
[0004] In order to solve these problems, catalytic distillation technology, as a new separation technology, has received widespread attention in recent years. Catalytic distillation combines the advantages of catalytic reaction and distillation separation, and can promote the separation of target substances in complex mixtures under relatively mild conditions, while having high energy efficiency and good separation selectivity. By optimizing the selection of catalysts and reaction conditions, it is possible to improve the reaction efficiency and achieve the goals of low energy consumption and low emissions in the separation process of urea-green ammonia mixture.
[0005] However, the existing technology still faces many challenges in the separation process of urea and green ammonia in the green power co-production urea-green ammonia mixture, including catalyst stability, separation accuracy and complexity of process operation, etc. Therefore, developing an efficient, economical and environmentally friendly process to achieve the separation of urea and green ammonia can not only improve the resource utilization rate of green power co-production urea, but also provide a new solution for the recovery of biuret, which has important technical significance and application prospects. Summary of the invention
[0006] The present invention provides a post-treatment process method for a green electricity co-produced urea-green ammonia mixture, which is used to solve the above-mentioned technical problems existing in the prior art.
[0007] According to a first aspect of the present invention, the present invention provides a method for preparing biuret, which is obtained by catalytic reaction of urea, ammonia and carbon-containing raw materials under the action of a catalyst; the catalyst is an iron-based catalyst.
[0008] Furthermore, the molar ratio of the urea to the carbon-containing raw material is (1-5):1; the molar ratio of the ammonia to the urea is (1-5):1.
[0009] Furthermore, the iron-based catalyst is AMOMAX or TA201.
[0010] Furthermore, the amount of the iron-based catalyst used is 0.1-0.2% of the quality of the urea.
[0011] Furthermore, the carbon-containing raw material is one or a combination of two or more of natural gas, methanol, dimethyl carbonate and coal.
[0012] Furthermore, the temperature of the catalytic reaction is 190-200° C. and the pressure is 1.3-2.8 MPa.
[0013] According to the second aspect of the present invention, the present invention also provides the application of the above-mentioned preparation method in the post-treatment process of the green electricity co-production urea-green ammonia mixture.
[0014] According to a third aspect of the present invention, the present invention also provides a post-treatment process for a green electricity co-produced urea-green ammonia mixture, comprising the following steps: The green electricity co-produced urea-green ammonia mixture and the carbon-containing raw materials are fed into a catalytic distillation tower equipped with an iron-based catalyst to react and generate products containing biuret and green ammonia; The product containing biuret and green ammonia is subjected to a first distillation in the catalytic distillation tower and then enters a separation distillation tower for a second distillation, green ammonia is extracted from the top of the separation distillation tower, and biuret is extracted from the bottom of the separation distillation tower.
[0015] Furthermore, the molar fraction of green ammonia in the green power co-produced urea-green ammonia mixture is ≥50%; the molar fraction of urea in the green power co-produced urea-green ammonia mixture is ≤25%.
[0016] Furthermore, the feed flow rate of the green power co-production urea-green ammonia mixture is 10-30 L / h, and the feed flow rate of the carbon-containing raw material is 5-15 kmol / h.
[0017] Furthermore, the operating pressure of the catalytic distillation tower is 1.3-2.8 MPa, the tower top temperature is 130-140°C, and the tower bottom temperature is 190-200°C.
[0018] And / or, the operating pressure of the separation distillation tower is 2.5-3.5 MPa, the tower top temperature is 100-120°C, and the tower bottom temperature is 140-150°C.
[0019] Furthermore, the molar ratio of green ammonia to carbon-containing raw materials in the green power co-production urea-green ammonia mixture is (1-5):1.
[0020] Furthermore, the iron-based catalyst is AMOMAX or TA201.
[0021] Furthermore, the amount of the iron-based catalyst used is 0.1-0.2% of the urea quality in the green power co-production urea-green ammonia mixture.
[0022] Furthermore, the carbon-containing raw material is one or a combination of two or more of natural gas, methanol, dimethyl carbonate and coal.
[0023] Beneficial effects of the present invention: The post-treatment process method for a green electricity co-production urea-green ammonia mixture provided by the present invention has readily available raw materials, a simple preparation method, and can improve the comprehensive utilization rate of resources.
[0024] The present invention provides a post-treatment process method for a green power co-produced urea-green ammonia mixture. The urea in the green power co-produced urea-green ammonia mixture is converted into biuret by utilizing the above-mentioned preparation method of biuret. The catalytic distillation technology and the secondary distillation process are then combined to effectively separate biuret and green ammonia, and the recovery of biuret and purification of green ammonia can be realized, thereby achieving the purpose of comprehensive utilization of resources and having significant economic and environmental benefits. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0026] In a first typical embodiment of the present invention, the present invention provides a method for preparing biuret. According to some specific embodiments of the present invention, the preparation method is to obtain biuret by catalytic reaction of urea, ammonia and carbon-containing raw materials under the action of an iron-based catalyst.
[0027] Using urea as raw material to synthesize biuret can utilize urea more efficiently, increase the added value of urea, and reduce the waste of urea in agricultural and industrial use.
[0028] In some specific embodiments, the molar ratio of ammonia to carbon-containing raw material is (1-5): 1; the molar ratio of ammonia to urea is (1-5): 1. By limiting the molar ratio of ammonia to carbon-containing raw material and the molar ratio of ammonia to urea to a reasonable range, the efficiency of the catalytic reaction is improved.
[0029] Optionally, the molar ratio of ammonia to the carbon-containing raw material can be 1:1, 2:1, 3:1, 4:1 or 5:1, etc., and of course it can also be other values within the above range, which is not limited here. The molar ratio of ammonia to urea is 1:1, 2:1, 3:1, 4:1 or 5:1, etc., and of course it can also be other values within the above range, which is not limited here.
[0030] Preferably, the iron-based catalyst is AMOMAX or TA201.
[0031] In some specific embodiments, the amount of the iron-based catalyst is 0.1-0.2% of the quality of the urea. By limiting the amount of the iron-based catalyst to a reasonable range, it is beneficial to increase the rate of the catalytic reaction and allow the reaction to proceed at a lower temperature and pressure, while excessive catalyst may lead to increased costs and limited efficiency improvements. Limiting the amount of the iron-based catalyst to a reasonable range will also increase the activity of a specific reaction pathway, thereby improving the selectivity of the product.
[0032] Optionally, the amount of the iron-based catalyst as a mass percentage of the mass of the urea can be 0.1%, 0.11%, 0.12%, 0.13%, 0.14%, 0.15%, 0.16%, 0.17%, 0.18%, 0.19% or 0.2%, etc., and of course it can also be other values within the above range, which is not limited here.
[0033] In some specific embodiments, the carbon-containing raw material is one or a combination of two or more of natural gas, methanol, dimethyl carbonate and coal. Preferably, the carbon-containing raw material is methanol.
[0034] Coal can generally be peat, lignite, coking coal, bituminous coal, etc.
[0035] In some specific embodiments, when the carbon-containing raw material is methanol, the reaction equation for reacting methanol with urea to produce biuret is: CH4N2O+CH3OH+NH3→C2H5N3O2+3H2.
[0036] In some specific embodiments, when the carbon-containing raw material is dimethyl carbonate, the reaction equation for the reaction between dimethyl carbonate and urea to produce biuret is: CH4N2O+C3H6O3+4NH3→2C2H5N3O2+6H2.
[0037] In some specific embodiments, the temperature of the catalytic reaction is 190-200° C. and the pressure is 1.3-2.8 MPa.
[0038] By limiting the temperature and pressure of the catalytic reaction within a reasonable range, the efficiency of the catalytic reaction is improved and the generation of biuret is more favorable.
[0039] Optionally, the temperature of the catalytic reaction can be 190°C, 191°C, 192°C, 193°C, 194°C, 195°C, 196°C, 197°C, 198°C, 199°C or 200°C, etc., and of course it can also be other values within the above range, which is not limited here.
[0040] Optionally, the pressure of the catalytic reaction can be 1.3MPa, 1.4MPa, 1.5MPa, 1.6MPa, 1.7MPa, 1.8MPa, 1.9MPa, 2.0MPa, 2.1MPa, 2.2MPa, 2.3MPa, 2.4MPa, 2.5MPa, 2.6MPa, 2.7MPa or 2.8MPa, etc., and of course it can also be other values within the above range, which is not limited here.
[0041] In a second typical embodiment of the present invention, the present invention also provides application of the above-mentioned preparation method in a post-treatment process of a green electricity co-production urea-green ammonia mixture.
[0042] In a third typical embodiment of the present invention, the present invention further provides a post-treatment process for a green power co-produced urea-green ammonia mixture, comprising the following steps: feeding the green power co-produced urea-green ammonia mixture and a carbon-containing raw material into a catalytic distillation tower equipped with an iron-based catalyst to react and generate a product containing biuret and green ammonia; The product containing biuret and green ammonia is subjected to a first distillation in the catalytic distillation tower and then enters a separation distillation tower for a second distillation, green ammonia is extracted from the top of the separation distillation tower, and biuret is extracted from the bottom of the separation distillation tower.
[0043] It should be noted that the green power co-production urea-green ammonia mixture generally mainly includes urea and green ammonia, and also includes a small amount of carbon dioxide.
[0044] The present invention proposes a post-processing process method for a green power co-produced urea-green ammonia mixture. The urea in the green power co-produced urea-green ammonia mixture is converted into biuret by utilizing the above-mentioned preparation method of biuret. The combination of catalytic distillation technology and secondary distillation process is then used. It can not only effectively separate biuret from green ammonia, but also realize the recovery of biuret and purification of green ammonia, so as to achieve the purpose of comprehensive utilization of resources and have significant economic and environmental benefits. Catalytic distillation combines the advantages of catalytic reaction and distillation separation, and can promote the separation of target substances in complex mixtures under relatively mild conditions, while having high energy efficiency and good separation selectivity. The first distillation is to convert urea in the urea-green ammonia mixture into biuret, and the second distillation is to separate biuret from green ammonia.
[0045] In some specific embodiments, the mole fraction of green ammonia in the green power co-produced urea-green ammonia mixture is ≥50%. Optionally, the mole fraction of green ammonia in the green power co-produced urea-green ammonia mixture may be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90% or 99%, etc., and of course, it may be other values within the above range, which are not limited here.
[0046] In some specific embodiments, the molar fraction of urea in the green power co-production urea-green ammonia mixture is ≤25%.
[0047] Optionally, the molar fraction of urea in the green power co-production urea-green ammonia mixture can be 25%, 20%, 15%, 10%, 5%, 3%, 1%, 0.5% or 0.1%, etc.
[0048] Controlling the feed flow rate of the reaction raw materials plays an important role in ensuring the stability, safety, efficiency and product quality of the chemical reaction. Furthermore, the feed flow rate of the green power co-production urea-green ammonia mixture is 10-30L / h, and the feed flow rate of the carbon-containing raw material is 5-15kmol / h.
[0049] By limiting the feed flow rate of the green power co-production urea-green ammonia mixture and the feed flow rate of the carbon-containing raw material within a reasonable range, the stability, safety, efficiency and product quality of the catalytic reaction can be ensured.
[0050] In some specific embodiments, the catalytic distillation tower and the separation distillation tower are plate towers or packed towers.
[0051] In some specific embodiments, the catalytic distillation tower comprises a catalytic reaction section and a distillation section. The catalytic reaction section is used for catalytic reaction, and a catalyst is arranged in the section. The distillation section is used for primary distillation of the synthetic products biuret and green ammonia.
[0052] In some specific embodiments, the operating pressure of the catalytic distillation tower is 1.3-2.8 MPa, the tower top temperature is 130-140°C, and the tower bottom temperature is 190-200°C.
[0053] Optionally, the operating pressure of the catalytic distillation tower can be 1.3 MPa, 1.4 MPa, 1.5 MPa, 1.6 MPa, 1.7 MPa, 1.8 MPa, 1.9 MPa, 2.0 MPa, 2.1 MPa, 2.2 MPa, 2.3 MPa, 2.4 MPa, 2.5 MPa, 2.6 MPa, 2.7 MPa or 2.8 MPa, etc., and of course it can also be other values within the above range, which is not limited here.
[0054] Optionally, the top temperature of the catalytic distillation tower can be 130°C, 131°C, 132°C, 133°C, 134°C, 135°C, 136°C, 137°C, 138°C, 139°C or 140°C, etc., and of course it can also be other values within the above range, which is not limited here.
[0055] Optionally, the bottom temperature of the catalytic distillation tower can be 190°C, 191°C, 192°C, 193°C, 194°C, 195°C, 196°C, 197°C, 198°C, 199°C or 200°C, etc., and of course it can also be other values within the above range, which is not limited here.
[0056] In some specific embodiments, the operating pressure of the separation distillation tower is 2.5-3.5 MPa, the tower top temperature is 100-120°C, and the tower bottom temperature is 140-150°C.
[0057] Optionally, the operating pressure of the separation distillation tower can be 2.5 MPa, 2.6 MPa, 2.7 MPa, 2.8 MPa, 2.9 MPa, 3.0 MPa, 3.1 MPa, 3.2 MPa, 3.3 MPa, 3.4 MPa or 3.5 MPa, etc., and of course it can also be other values within the above range, which is not limited here.
[0058] Optionally, the top temperature of the separation distillation tower may be 100° C., 105° C., 110° C., 115° C. or 120° C., etc., and may also be other values within the above range, which is not limited here.
[0059] Optionally, the bottom temperature of the separation distillation tower is 140°C, 141°C, 142°C, 143°C, 144°C, 145°C, 146°C, 147°C, 148°C, 149°C or 150°C, etc., and of course it can also be other values within the above range, which is not limited here.
[0060] In some specific embodiments, the molar ratio of green ammonia to carbon-containing raw materials in the green power co-production urea-green ammonia mixture is (1-5):1.
[0061] In some specific embodiments, the iron-based catalyst is AMOMAX or TA201.
[0062] In some specific embodiments, the amount of the iron-based catalyst used is 0.1-0.2% of the urea quality in the green power co-production urea-green ammonia mixture.
[0063] In some specific embodiments, the carbon-containing raw material is one or a combination of two or more of natural gas, methanol, dimethyl carbonate and coal.
[0064] In some specific embodiments, the carbon-containing raw material is methanol. In other specific embodiments, the carbon-containing raw material is dimethyl carbonate.
[0065] The beneficial effects of the present invention will be described below in conjunction with specific embodiments and comparative examples.
[0066] Example 1 This embodiment provides a post-treatment process for a green electricity co-production urea-green ammonia mixture, comprising the following steps: Step (1): The green electricity co-produced urea-green ammonia mixture and the carbon-containing raw material are fed into a catalytic distillation tower equipped with an iron-based catalyst to react and generate products containing biuret and green ammonia.
[0067] The operating conditions of the catalytic distillation tower are as follows: the feed flow rate of the green power co-production urea-green ammonia mixture is 20 L / h, of which the molar fraction of green ammonia is 50% and the molar fraction of urea is 25%.
[0068] The carbon-containing raw material used was industrial methanol, the feed flow rate was 10 kmol / h, and the feed molar ratio of green ammonia to methanol was 1.5:1.
[0069] The iron-based catalyst used is AMOMAX-02, the catalyst addition amount is 100kg, which is 0.1% of the urea quality, and the operating pressure is 2MPa.
[0070] The top temperature of the catalytic distillation tower is 130°C and the bottom temperature is 200°C.
[0071] Step (2): The product containing biuret and green ammonia is subjected to a first distillation in a catalytic distillation tower and then enters a separation distillation tower for a second distillation, and the green ammonia is extracted from the top of the separation distillation tower, and the biuret is extracted from the bottom of the separation distillation tower.
[0072] The operating pressure of the separation distillation tower is 3MPa.
[0073] The top temperature of the separation distillation tower is 100°C, and the molar percentage of the product composition of green ammonia is 69.9%; the bottom temperature of the tower is 140°C, and the molar percentage of the product composition of biuret is 99.9%.
[0074] Example 2 This embodiment provides a post-treatment process for a green electricity co-production urea-green ammonia mixture, comprising the following steps: Step (1): The green power co-produced urea-green ammonia mixture and the carbon-containing raw material are fed into a catalytic distillation tower containing a catalyst to react and generate products containing biuret and green ammonia.
[0075] The operating conditions of the catalytic distillation tower are as follows: the feed flow rate of the green power co-production urea-green ammonia mixture is 20 L / h, of which the molar fraction of green ammonia is 50% and the molar fraction of urea is 25%.
[0076] The carbon-containing raw material used was industrial methanol, the feed flow rate was 10 kmol / h, and the feed molar ratio of green ammonia to methanol was 2:1.
[0077] The iron-based catalyst used is AMOMAX-02, the catalyst addition amount is 150kg, which is 0.15% of the urea quality, and the operating pressure is 2.5MPa.
[0078] The top temperature of the catalytic distillation tower is 140°C and the bottom temperature is 190°C.
[0079] Step (2): The product containing biuret and green ammonia is subjected to a first distillation in a catalytic distillation tower and then enters a separation distillation tower for a second distillation, and the green ammonia is extracted from the top of the separation distillation tower, and the biuret is extracted from the bottom of the separation distillation tower.
[0080] The operating pressure of the separation distillation tower is 2.5MPa.
[0081] The top temperature of the separation distillation tower is 120°C, and the molar percentage of the product composition of green ammonia is 65.1%; the bottom temperature of the tower is 150°C, and the molar percentage of the product composition of biuret is 93.2%.
[0082] Example 3 This embodiment provides a post-treatment process for a green electricity co-production urea-green ammonia mixture, comprising the following steps: Step (1): The green power co-produced urea-green ammonia mixture and the carbon-containing raw material are fed into a catalytic distillation tower containing a catalyst to react and generate products containing biuret and green ammonia.
[0083] Among them, the operating conditions of the catalytic distillation tower are: the feed flow rate of the green power co-production urea-green ammonia mixture is 18L / h, of which the molar fraction of green ammonia accounts for 60% and the molar fraction of urea accounts for 10%.
[0084] The carbon-containing raw material is dimethyl carbonate, the feed flow rate is 10 kmol / h, and the feed molar ratio of green ammonia to dimethyl carbonate is 4:1.
[0085] The iron-based catalyst used is TA201, the catalyst addition amount is 200kg, which is 0.2% of the urea quality, and the operating pressure is 2.8MPa.
[0086] The top temperature of the catalytic distillation tower is 135°C and the bottom temperature is 195°C.
[0087] Step (2): The product containing biuret and green ammonia is subjected to a first distillation in a catalytic distillation tower and then enters a separation distillation tower for a second distillation, and the green ammonia is extracted from the top of the separation distillation tower, and the biuret is extracted from the bottom of the separation distillation tower.
[0088] The operating pressure of the separation distillation tower is 3MPa.
[0089] The top temperature of the separation distillation tower is 110°C, and the molar percentage of the product composition of green ammonia is 64.1%; the bottom temperature of the tower is 145°C, and the molar percentage of the product composition of biuret is 96.8%.
[0090] It should be noted that the endpoints and any values of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, the endpoint values of each range and the individual point values, and the individual point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in this article.
[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "specific implementation methods", or "some specific implementation methods" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for preparing biuret, characterized in that: The catalyst is obtained by catalytic reaction of urea, ammonia and carbon-containing raw materials under the action of a catalyst; the catalyst is an iron-based catalyst.
2. The preparation method according to claim 1, characterized in that: The molar ratio of the ammonia to the carbon-containing raw material is (1-5):1; the molar ratio of the ammonia to the urea is (1-5):
1.
3. The preparation method according to claim 1, characterized in that: The iron-based catalyst is AMOMAX or TA201.
4. The preparation method according to claim 1, characterized in that: The amount of the iron-based catalyst used is 0.1-0.2% of the quality of the urea.
5. The preparation method according to claim 1, characterized in that: The carbon-containing raw material is one or more of natural gas, methanol, dimethyl carbonate and coal.
6. The preparation method according to claim 1, characterized in that: The temperature of the catalytic reaction is 190-200° C. and the pressure is 1.3-2.8 MPa.
7. Application of the preparation method according to any one of claims 1 to 6 in the post-treatment process of green electricity co-production of urea-green ammonia mixture.
8. A post-treatment process for a green electricity co-production urea-green ammonia mixture, characterized in that: The steps include: The green electricity co-produced urea-green ammonia mixture and the carbon-containing raw materials are fed into a catalytic distillation tower equipped with an iron-based catalyst to react and generate products containing biuret and green ammonia; The product containing biuret and green ammonia is subjected to a first distillation in the catalytic distillation tower and then enters a separation distillation tower for a second distillation, green ammonia is extracted from the top of the separation distillation tower, and biuret is extracted from the bottom of the separation distillation tower.
9. The post-processing method according to claim 8, characterized in that: The molar fraction of green ammonia in the green power co-production urea-green ammonia mixture is ≥50%; the molar fraction of urea in the green power co-production urea-green ammonia mixture is ≤25%; And / or, the feed flow rate of the green electricity co-production urea-green ammonia mixture is 10-30 L / h, and the feed flow rate of the carbon-containing raw material is 5-15 kmol / h; And / or, the operating pressure of the catalytic distillation tower is 1.3-2.8 MPa, the tower top temperature is 130-140°C, and the tower bottom temperature is 190-200°C; And / or, the operating pressure of the separation distillation tower is 2.5-3.5 MPa, the tower top temperature is 100-120°C, and the tower bottom temperature is 140-150°C.
10. The post-processing method according to claim 8 or 9, characterized in that: The molar ratio of green ammonia to carbon-containing raw materials in the green power co-production urea-green ammonia mixture is (1-5):1; And / or, the iron-based catalyst is AMOMAX or TA201; And / or, the amount of the iron-based catalyst used is 0.1-0.2% of the urea quality in the green power co-production urea-green ammonia mixture; And / or, the carbon-containing raw material is one or more of natural gas, methanol, dimethyl carbonate and coal.