Method and system for determining carbon emissions of a polycarbonate production process
By dividing the production boundaries and sections of the polycarbonate production process and calculating the carbon emissions of each section, the accuracy problem of carbon emission calculation in the existing technology is solved, and low-carbon optimization and efficient evaluation of the polycarbonate production process are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2024-11-29
- Publication Date
- 2026-05-29
AI Technical Summary
The carbon emission calculations in the polycarbonate production process in the current technology lack accuracy and scientific rigor. The selection of carbon emission factors and energy consumption data is unreasonable, which affects the accuracy of carbon emission accounting in the chemical production process.
By defining the entire life cycle production boundary of the polycarbonate production process, it is divided into multiple production segments. The material consumption and carbon emission factor of each segment are calculated. Combined with the target product output, the carbon emission of each segment is determined, and finally the total carbon emission of the polycarbonate production process is calculated.
It provides a more accurate and efficient method for evaluating the carbon emissions of polycarbonate, optimizes production processes, achieves low-carbon levels in chemical production processes, and improves the scientificity and accuracy of carbon emission calculations.
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Figure CN122114693A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of chemical technology, and specifically to a method and system for determining carbon emissions in a polycarbonate production process. Background Technology
[0002] In the context of increasingly severe global warming, the petrochemical industry, as a major carbon emitter, sees carbon emissions permeating its entire industrial chain. Facing the demands of green industrial development, the pressure to reduce carbon emissions cannot be underestimated. The accounting of carbon emissions in the petrochemical industry has become a crucial foundation for achieving carbon neutrality and improving energy efficiency. The environmental impact of chemical production mainly stems from two stages: the raw materials and energy consumed during production, and the waste emitted during production. This manifests primarily as global warming, ozone depletion, and atmospheric acidification. Accurately calculating and evaluating carbon emissions in chemical production is vital for reducing environmental pollution and conserving energy. Currently, carbon emission calculations in chemical production still suffer from a lack of case studies and inappropriate selection of carbon emission factors and energy consumption data, affecting the scientific rigor and authority of carbon emission accounting data in chemical production processes. Summary of the Invention
[0003] The purpose of this invention is to at least solve some of the problems mentioned above, and to provide a method and system for determining the carbon emissions of the polycarbonate production process. This provides an accurate and efficient polycarbonate carbon emission evaluation process, thereby enabling a comprehensive assessment of the carbon emissions during the polycarbonate production process.
[0004] To achieve the above objectives, a first aspect of the present invention provides a method for determining the carbon emissions of a polycarbonate production process. The method includes: determining multiple production segments within a production boundary based on the entire life cycle of the polycarbonate production process; determining the carbon emissions of each production segment based on the consumption and carbon emission factor of each material in each of the multiple production segments and the yield of the target product in each production segment; and determining the carbon emissions of the polycarbonate production process based on the carbon emissions of each production segment.
[0005] Preferably, the plurality of production stages include a first production stage in which CO2 and ethylene oxide undergo a cycloaddition reaction to prepare ethylene carbonate; a second production stage in which ethylene carbonate and methanol undergo a transesterification reaction to prepare dimethyl carbonate; a third production stage in which dimethyl carbonate and phenol react to prepare diphenyl carbonate; and a fourth production stage in which diphenyl carbonate and bisphenol A react to prepare polycarbonate.
[0006] Preferably, determining the carbon emissions in each production segment includes: determining the carbon emissions C in the k-th production segment according to the following formula. k :
[0007]
[0008] Among them, F i,k k i These represent the consumption and carbon emission factor of material i within the k-th production section, respectively; P k Let n be the output of the target product in the k-th production section; and n be the number of the plurality of production sections.
[0009] Preferably, k is determined by the following formula. i :
[0010]
[0011] Among them, F j It refers to the consumption of raw material j related to material i; k j The carbon emission factor of raw material j; p i Let be the output of material i; and s be the quantity of raw materials involved in material i.
[0012] Preferably, the material includes one or more of the following: raw materials, industrial electricity, thermal steam, industrial water, transportation fuel, and additives.
[0013] Preferably, the production boundary begins at the point where the raw materials for polycarbonate production, industrial electricity, steam, industrial water, transportation fuel, and additives enter the factory gate, and ends at the point where polycarbonate, by-products, waste gas, waste liquid, and solid waste are transported to the factory gate.
[0014] Preferably, the determination method further includes: optimizing the carbon reduction process in any production section when the carbon emissions in any production section exceed a corresponding threshold.
[0015] Through the above technical solution, this invention creatively first determines multiple production segments within the production boundary based on the entire life cycle of the polycarbonate production process; then, based on the consumption and carbon emission factor of each material in each of the multiple production segments and the output of the target product in each production segment, the carbon emission amount in each production segment is determined; finally, based on the carbon emission amount in each production segment, the carbon emission amount of the polycarbonate production process is determined. Thus, this invention effectively solves the problem of carbon emission data errors and the lack of reports on carbon emission calculations in chemical production processes, which affect the accuracy of carbon emission calculations in chemical production processes. This method for calculating carbon emissions in the polycarbonate production process can quickly and effectively provide a more accurate and efficient polycarbonate carbon emission calculation and evaluation process, optimize the polycarbonate production process, and achieve a low-carbon level in the chemical production process.
[0016] A second aspect of the present invention provides a system for determining the carbon emissions of a polycarbonate production process. The system includes: a process segment determination device for determining multiple production segments within a production boundary based on the entire life cycle of the polycarbonate production process; a process segment carbon emission determination device for determining the carbon emissions of each production segment based on the consumption and carbon emission factor of each material in each of the multiple production segments and the yield of the target product in each production segment; and a total carbon emission determination device for determining the carbon emissions of the polycarbonate production process based on the carbon emissions of each production segment.
[0017] For details and benefits of the system for determining carbon emissions in the polycarbonate production process provided in the embodiments of the present invention, please refer to the above description of the method for determining carbon emissions in the polycarbonate production process, which will not be repeated here.
[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description
[0019] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:
[0020] Figure 1 This is a flowchart of a method for determining carbon emissions in a polycarbonate production process according to an embodiment of the present invention;
[0021] Figure 2 This is a schematic diagram illustrating the delineation of production boundaries and production sections in a polycarbonate production process according to an embodiment of the present invention; and
[0022] Figure 3This is a schematic diagram showing the division of production sections in a polycarbonate production process according to an embodiment of the present invention. Detailed Implementation
[0023] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0024] Polycarbonate, as a high-performance engineering plastic, possesses outstanding tensile and impact strength, high flexural strength and rigidity, and excellent comprehensive properties such as heat resistance and insulation. With technological reforms and process optimization, current polycarbonate production technology mainly utilizes non-phosgene melt processes to prepare carbonates from CO2. This preparation method has advantages such as being fully enclosed, producing no by-products, and being environmentally friendly, achieving high-value utilization of CO2 and aligning with the concept of green industrial development. However, existing technologies only involve the production of chemicals such as polycarbonate and lack the process and evaluation methods for calculating carbon emissions from chemical processes using new materials, and cannot guide the development of low-carbon preparation schemes for polycarbonate production.
[0025] To address the shortcomings of existing methods for evaluating the low-carbon level of chemical processes, this invention provides a method for evaluating the low-carbon level of polycarbonate production processes. This method effectively solves the problems of errors in carbon emission data from chemical production processes and the lack of reports on carbon emission calculations in polycarbonate production processes, which affect the accuracy of carbon emission calculations in chemical production processes.
[0026] Figure 1 This is a flowchart illustrating a method for determining carbon emissions in a polycarbonate production process according to an embodiment of the present invention. Figure 1 As shown, the determination method includes: step S101, determining multiple production sections within the production boundary based on the entire life cycle of the polycarbonate production process; step S102, determining the carbon emissions in each production section based on the consumption and carbon emission factor of each material in each production section and the output of the target product in each production section; and step S103, determining the carbon emissions of the polycarbonate production process based on the carbon emissions in each production section.
[0027] The following sections will explain and illustrate each of the above steps.
[0028] Step S101: Based on the entire life cycle of the polycarbonate production process, determine multiple production sections within the production boundary.
[0029] The polycarbonate production process refers to the entire process of preparing polycarbonate polymer materials and by-products using CO2 as raw material. The molecular weight of the polycarbonate polymer material is not less than 200. The low-carbon level evaluation process is illustrated using a company's thousand-ton-level polycarbonate project as an example. The low-carbon level refers to the equivalent carbon dioxide emissions per unit of polycarbonate production process. The unit of polycarbonate can be either per ton of polycarbonate or per kilogram of polycarbonate.
[0030] The production boundary begins at the point where raw materials for polycarbonate production, industrial electricity, steam, industrial water, transportation fuel, and additives enter the factory gate, and ends at the point where polycarbonate, by-products, waste gas, waste liquid, and solid waste are transported to the factory gate.
[0031] First, define the production boundary (i.e., system boundary) for carbon emissions throughout the entire life cycle of polycarbonate production. Specifically, taking the non-phosgene melt production process of polycarbonate as an example, the boundary begins when the raw materials f1 for producing one unit of polycarbonate (including carbon dioxide (CO2), ethylene oxide, methanol, phenol, and bisphenol A) enter the polycarbonate production plant, and ends when the unit of polycarbonate product is transported to the plant gate. The specific production boundary definition can be referenced below. Figure 2 As shown, it is a closed region. That is to say, the production boundary is defined by the physical transfers, chemical transformations, and other processes involved in the production of polycarbonate.
[0032] The carbon emissions involved in the physical transfer include those from one or more of the following within the production boundary: material transport, pipeline transport, mechanical transfer, mixing, filtration, evaporation, distillation, flash evaporation, purging, leakage, use of industrial electricity, use of thermal steam, and use of fuel. The carbon emissions involved in the chemical conversion include those from one or more of the following within the production boundary: raw material chemical reaction, auxiliary agent chemical reaction, material incineration, conversion using auxiliary agents, waste gas treatment, waste liquid treatment, and solid waste treatment.
[0033] Then, Aspen modeling was used to model the polycarbonate production process, determining the process flow from carbon dioxide to polycarbonate. This process includes fluid transport, heat transfer, and distillation in the physical transfer process, and cycloaddition and transesterification reactions in the chemical conversion process. The non-phosgene melt production process for polycarbonate includes the cycloaddition reaction of CO2 and ethylene oxide to prepare ethylene carbonate, the transesterification reaction of ethylene carbonate and methanol to prepare dimethyl carbonate, the reaction of dimethyl carbonate and phenol to prepare diphenyl carbonate, and the reaction of diphenyl carbonate and bisphenol A to prepare polycarbonate. Specific production processes are detailed below. Figure 2 As shown.
[0034] The plurality of production stages may include a first production stage in which CO2 and ethylene oxide undergo a cycloaddition reaction to prepare ethylene carbonate; a second production stage in which ethylene carbonate and methanol undergo a transesterification reaction to prepare dimethyl carbonate; a third production stage in which dimethyl carbonate and phenol react to prepare diphenyl carbonate; and a fourth production stage in which diphenyl carbonate and bisphenol A react to prepare polycarbonate.
[0035] Accordingly, the target product of the first production stage is ethylene carbonate; the target product of the second production stage is dimethyl carbonate; the target product of the third production stage is diphenyl carbonate; and the target product of the fourth production stage is polycarbonate.
[0036] When performing a full life-cycle carbon emission accounting for the 1000t polycarbonate production process, in order to achieve efficient analysis of the carbon emission processes of different production stages in the later stages, the polycarbonate production process was divided into four production stages for separate data collection and calculation, such as... Figure 3 As shown.
[0037] Step S102: Determine the carbon emissions in each production section based on the consumption of each material and the carbon emission factor in each of the multiple production sections, as well as the output of the target product in each production section.
[0038] The materials may include one or more of the following: raw materials, industrial electricity, thermal steam, industrial water, transportation fuel, and additives. The material data originates from monitoring data during actual production in chemical plants, production simulation data from chemical engineering software, or data from published literature.
[0039] For step S102, determining the carbon emissions in each production segment includes: determining the carbon emissions C in the k-th production segment according to the following formula (1). k :
[0040]
[0041] Among them, F i,k k i These represent the consumption and carbon emission factor of material i within the k-th production section, respectively; P k Let n be the output of the target product in each production section; and n be the number of the plurality of production sections.
[0042] k is determined by the following formula (2). i :
[0043]
[0044] Among them, F j It refers to the consumption of raw material j related to material i; k j The carbon emission factor of raw material j (which can be obtained by searching for information); p i Let be the output of material i; and s be the quantity of raw materials involved in material i.
[0045] Of course, in one embodiment, the carbon emission factor of each material i can be obtained by any existing method. Specifically, firstly, the consumption data f within a unit period t (e.g., t is the annual production time of 8000 h for a production of 1,000 tons of polycarbonate per year) within the production boundary is statistically analyzed. i and output data p i This includes consumption data for any one or more combinations of raw materials f1, industrial electricity f2, thermal steam f3, industrial water f4, transportation fuel f5, and additives f6, as well as output data for any one or more combinations of polycarbonate p1, by-product p2, waste gas p3, waste liquid p4, and waste solid p5. The unit period t can be any one of 1 hour, 1 day, 3 days, 7 days, 1 month, or 1 year. By-product p2 is at least one valuable, commercially available substance, including but not limited to ethylene glycol, propylene glycol, ethylene carbonate, dimethyl carbonate, diphenyl carbonate, and methanol.
[0046] According to the modeling information, the polycarbonate production process is to produce 1,000 tons of polycarbonate per year, with an annual production time of 8,000 hours, which is equivalent to producing 125 kg of polycarbonate per hour. By collecting data on the 1,000 t polycarbonate production process, the input data (including the following input quantities and corresponding carbon emission factors) and output data (obtained through the above formula (2)) for 8,000 hours within the production area are obtained. The input quantities include: raw materials f1, carbon dioxide 212.5t, ethylene oxide 202.5t, methanol 293.6t, phenol 816.2t and bisphenol A 886.2t; industrial electricity f2, 11,373,525.5 kWh; thermal steam f3, 6,167.81t; industrial water f4, 2,766,232.80t; transportation fuel f5, pipeline transportation 100tkm and tank truck transportation 100tkm; additives f6. Output data within the production area over 8000 hours includes: polycarbonate p1, 1000t; by-products p2, ethylene glycol 274.4t and methanol 280.3t; waste gas p3, 30.717kg, waste liquid p4, 19.25kg, and solid waste p5, 100kg. Specific data are shown in Table 1.
[0047] Next, the material f within the statistical production boundary is obtained through query calculation. i carbon emission factor k iThe unit output P is calculated using the formula. i Unit consumption F i The specific calculation method is as follows:
[0048]
[0049] Taking the first stage of the 1000t polycarbonate production process (the cycloaddition reaction of CO2 and ethylene oxide to prepare ethylene carbonate) as an example, the material inputs of this stage include raw materials (212.5t carbon dioxide, 202.5t ethylene oxide), industrial electricity (0.77kWh), thermal steam (31.46t), industrial water (304.12t), transportation fuel (45tkm by tanker truck, 20tkm by pipeline), and additives (0.65t catalyst). The material outputs of this stage include product (404.3t ethylene carbonate), waste gas (10.79t), and waste liquid (1.92t).
[0050] Next, we will first calculate the unit consumption of each material in the first section (ethylene carbonate section) using the above formula (4):
[0051]
[0052] Unit power consumption
[0053] Unit heat steam consumption
[0054] Unit industrial water consumption
[0055] Unit tanker truck transportation consumption
[0056] Unit pipeline transportation consumption
[0057] Unit consumption of additives
[0058] Then, the unit material output in the first section is calculated using the above formula (3):
[0059] Yield per unit of ethylene carbonate
[0060] Next, the equivalent carbon emissions C1 in the first section are calculated using the above formula (1):
[0061]
[0062] Similarly, equivalent carbon emissions in other sections are calculated to obtain C2, C3, and C4.
[0063] The physical transfer processes in the first stage of the polycarbonate production process (i.e., the ethylene carbonate stage) include tank truck transportation, pipeline transportation, and industrial water use; the chemical conversion processes include the cycloaddition reactions occurring during the calculation process and the carbon dioxide emissions from the electricity and steam used. The equivalent carbon emissions for each stage involve calculations of both physical transfer and chemical conversion processes.
[0064] Table 1. Data Collection Table for a Method of Evaluating the Low-Carbon Level in Polycarbonate Production Process
[0065]
[0066]
[0067] Step S103: Determine the carbon emissions of the polycarbonate production process based on the carbon emissions in each production section.
[0068] The carbon emissions C of the polycarbonate production process are determined according to the following formula (5):
[0069]
[0070] Where m is the number of production sections, and C k Let be the carbon emissions in the kth production section.
[0071] According to the above formula (5), the equivalent carbon emissions of a unit of polycarbonate can be determined as C = C1 + C2 + C3 + C4.
[0072] In one embodiment, the determination method may further include: optimizing the carbon reduction process in any production section when the carbon emissions in any production section exceed a corresponding threshold.
[0073] For example, in the first production stage, the corresponding threshold for carbon emissions from ethylene carbonate is 825±10 kgCO2eq / t;
[0074] For the second production section, the corresponding threshold for carbon emissions from dimethyl carbonate is 1625±15 kgCO2eq / t.
[0075] For the third production section, the corresponding threshold for carbon emissions from diphenyl carbonate is 2180±20 kgCO2eq / t.
[0076] For the fourth production stage, the corresponding threshold for carbon emissions from polycarbonate is 3615±35 kgCO2eq / t.
[0077] Each threshold segment has a 10% margin of error above and below it to prevent misjudgments due to calculation bias. Of course, the thresholds can be adjusted according to actual circumstances.
[0078] Analyze the carbon emission results of the polycarbonate production process, optimize the process of the section with high carbon emissions in the polycarbonate production process, reduce the carbon emissions of the section, and reduce the carbon emission impact of the polycarbonate production process throughout its entire life cycle.
[0079] In one embodiment, the determination method may further include: presenting the carbon emission results in the form of a report in the form of charts or text to determine the amount of carbon dioxide emitted directly and indirectly during the physical transfer, chemical conversion and other processes involved in the production of polycarbonate.
[0080] To address the shortcomings of existing methods for evaluating the low-carbon level of chemical processes, this invention provides a method for evaluating the low-carbon level of polycarbonate production processes. This method effectively solves the problems of errors in carbon emission data from chemical production processes and the lack of reports on carbon emission calculations in polycarbonate production processes, which affect the accuracy of carbon emission calculations in chemical production processes.
[0081] The above embodiments are all illustrated using the non-phosgene melt production process of polycarbonate as an example. However, the method for determining the carbon emissions of the polycarbonate production process defined in this invention is not limited to the non-phosgene melt production process of polycarbonate. Other polycarbonate production processes are also feasible, such as the production process of directly preparing CO2-based polycarbonate by high-temperature polymerization using CO2 and epoxy alkane as raw materials.
[0082] This invention first delineates the production boundary of the polycarbonate production process, using the physical transfers and chemical conversions involved in polycarbonate production as the production boundary. The key to this step is to accurately and precisely define the amount of carbon dioxide emitted directly or indirectly during all physical transfers and chemical conversions within the polycarbonate production boundary, providing a basis for subsequent carbon emission data collection. Secondly, it models the polycarbonate production process and obtains the consumption data f within a unit period t within the production boundary based on the modeling data. i and output data p iThis step enables comprehensive monitoring and data collection of the polycarbonate production process, providing a data foundation for subsequent carbon emission calculation and analysis. It facilitates the identification of irrationalities in the polycarbonate production process and the reduction of carbon emissions. By collecting and statistically analyzing carbon emission factors during polycarbonate production and calculating carbon emission data from raw material consumption, energy consumption, and material transportation, the equivalent carbon emission per unit of polycarbonate in the non-phosgene melting process can be derived, allowing for a comprehensive assessment of carbon emissions during polycarbonate production. Furthermore, visualizing the polycarbonate carbon emission process using textual reports makes the data more intuitive and easier to understand. Finally, by analyzing and evaluating carbon emissions from the polycarbonate production process, potential problems in the production process can be accurately identified, leading to further optimization of the production process and targeted reductions in carbon emissions, ultimately resulting in low-carbon solutions for polycarbonate production.
[0083] In summary, this invention provides a method for evaluating the low-carbon level of polycarbonate production processes. This polycarbonate carbon emission calculation system comprises delineating production boundaries, production process modeling, data acquisition, carbon emission calculation, low-carbon reporting, and process optimization. It effectively solves the problems of data errors in carbon emission data and the lack of reports on carbon emission calculations in chemical production processes, which affect the accuracy of carbon emission calculations. This method for evaluating carbon emission calculations in polycarbonate production processes can quickly and effectively provide a more accurate and efficient evaluation process for polycarbonate carbon emissions, optimize polycarbonate production processes, and achieve low-carbon levels in chemical production.
[0084] An embodiment of the present invention provides a system for determining the carbon emissions of a polycarbonate production process. The system includes: a process segment determination device for determining multiple production segments within a production boundary based on the entire life cycle of the polycarbonate production process; a process segment carbon emission determination device for determining the carbon emissions of each production segment based on the consumption and carbon emission factor of each material in each of the multiple production segments and the yield of the target product in each production segment; and a total carbon emission determination device for determining the carbon emissions of the polycarbonate production process based on the carbon emissions of each production segment.
[0085] For details and benefits of the system for determining carbon emissions in the polycarbonate production process provided in the embodiments of the present invention, please refer to the above description of the method for determining carbon emissions in the polycarbonate production process, which will not be repeated here.
[0086] An embodiment of the present invention provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, which, when executed by a processor, implements a method for determining the carbon emissions of the polycarbonate production process.
[0087] One embodiment of the present invention provides a computer program product, including a computer program that, when executed by a processor, implements a method for determining the carbon emissions of the polycarbonate production process.
[0088] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.
[0089] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.
[0090] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.
[0091] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0092] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0093] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.
Claims
1. A method for determining the carbon emissions of a polycarbonate production process, characterized in that, The determination method includes: Based on the entire life cycle of the polycarbonate production process, multiple production sections within the production boundary are determined; Based on the consumption and carbon emission factor of each material in each of the multiple production sections, and the output of the target product in each production section, the carbon emissions in each production section are determined; and The carbon emissions of the polycarbonate production process are determined based on the carbon emissions in each production segment.
2. The determination method according to claim 1, characterized in that, The plurality of production sections include a first production section in which CO2 and ethylene oxide undergo a cycloaddition reaction to prepare ethylene carbonate; a second production section in which ethylene carbonate and methanol undergo a transesterification reaction to prepare dimethyl carbonate; a third production section in which dimethyl carbonate and phenol react to prepare diphenyl carbonate; and a fourth production section in which diphenyl carbonate and bisphenol A react to prepare polycarbonate.
3. The determining method according to claim 1 or 2, characterized in that, Determining the carbon emissions within each production segment includes: The carbon emissions C in the k-th production section are determined according to the following formula. k : Among them, F i,k k i These represent the consumption and carbon emission factor of material i within the k-th production section, respectively; P k Let n be the output of the target product in the k-th production section; and n be the number of the plurality of production sections.
4. The determination method according to claim 3, characterized in that, k is determined by the following formula. i : Among them, F j It refers to the consumption of raw material j related to material i; k j The carbon emission factor of raw material j; p i Let be the output of material i; and s be the quantity of raw materials involved in material i.
5. The determining method according to claim 1 or 2, characterized in that, The materials include one or more of the following: raw materials, industrial electricity, thermal steam, industrial water, transportation fuel, and additives.
6. The determining method according to claim 1 or 2, characterized in that, The production boundary begins at the point where raw materials for polycarbonate production, industrial electricity, steam, industrial water, transportation fuel, and additives enter the factory gate, and ends at the point where polycarbonate, by-products, waste gas, waste liquid, and solid waste are transported to the factory gate.
7. The determining method according to claim 1 or 2, characterized in that, The determination method further includes: If the carbon emissions in any production segment exceed the corresponding threshold, the process in that production segment will be optimized for carbon reduction.
8. A system for determining carbon emissions in a polycarbonate production process, characterized in that, The determining system includes: The production segment determination device is used to determine multiple production segments within the production boundary based on the entire life cycle of the polycarbonate production process. A process section carbon emission determination device is used to determine the carbon emissions of each production section based on the consumption and carbon emission factor of each material in each of the plurality of production sections and the output of the target product in each production section; and Total carbon emissions determination device, used to determine the carbon emissions of the polycarbonate production process based on the carbon emissions in each production segment.
9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method for determining the carbon emissions of the polycarbonate production process according to any one of claims 1-7.
10. A computer program product, characterized in that, The invention includes a computer program that, when executed by a processor, implements the method for determining the carbon emissions of the polycarbonate production process according to any one of claims 1-7.