CN111401717B - Method for evaluating carbon footprint of product in paraxylene production process and application of method - Google Patents
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Abstract
The invention relates to a method for evaluating the carbon footprint of a product in a paraxylene production process and application thereof. The method comprises the following steps: setting the carbon footprint data value of the raw material with known carbon footprint data as an iteration initial value, and calculating the carbon footprint data of the product according to the circulation path of the material in the production process; when the error between the calculated product carbon footprint data and the set initial value meets the requirement, the related calculation result is the material carbon footprint data of the paraxylene production process; when the difference between the calculated product carbon footprint data and the set iteration initial value does not meet the requirement, carrying out the next iteration again until the error of two adjacent iteration calculation meets the requirement; finally, obtaining carbon footprint data of the paraxylene production process product through a cyclic iteration method. The method can obtain more accurate, more reliable and more close to the carbon footprint data of actual production, and provides more practical and scientific guidance for realizing the transformation of the actual production to the low carbon.
Description
Technical Field
The invention relates to the fields of chemistry and chemical industry, in particular to a method for evaluating the carbon footprint of a product in a paraxylene production process and application thereof.
Background
With increasing emphasis on greenhouse gas emission management, more and more organizations and government departments begin to adopt Carbon Footprint (Carbon Footprint) to measure greenhouse gas emission of products, services, organizations, cities and countries, and provide decision basis for the development of emission reduction schemes. The carbon footprint of a product is calculated according to the whole life cycle range of the product, and the greenhouse gas emission is generated in the whole life cycle of the product obtained, produced, used and abandoned from raw materials, and is usually calculated as the mass equivalent of carbon dioxide (CO 2e ) Is the unit of evaluation.
Paraxylene (p-X) is an important raw material in the petrochemical industry, the energy consumption in the production process is high, a large amount of greenhouse gases are discharged, the product carbon footprint of the aromatic hydrocarbon production device is evaluated according to a full life cycle method, the carbon emission distribution of each link of aromatic hydrocarbon production can be mastered, the full life cycle carbon emission of the product can be obtained, and important guidance is provided for realizing low-carbon transformation in the industry.
According to a carbon footprint evaluation principle, carrying out product carbon footprint evaluation of a paraxylene production process, wherein the product carbon footprint evaluation needs to calculate emission data such as raw material brought emission, energy use emission and the like of each production unit or treatment process related to the production process; CO discharged from each link simultaneously 2 The distribution method is mainly characterized by comprising the following steps of: (1) Physical distribution, for example, in terms of quality of symbiotic product, volume of transported goods, number of units of product, chemical composition, etc.; (2) Economic dispatch, which distributes the emissions generated by the symbiotic process to the product under study and to the symbiotic product based on the economic value of the product exiting the mixed output process.
Taking an aromatic hydrocarbon combined device production process as an example, the material circulation amount in the xylene production process is large and even exceeds the amount of fresh feed (i.e. reformate), so that the influence of the material circulation process is considered in evaluating the carbon footprint of the process, and the method mainly comprises the following steps: isomerization unit C8 aromatic hydrocarbon- & gt xylene rectification unit C8 aromatic hydrocarbon- & gt raffinate of adsorption separation unit- & gt isomerization unit C8 aromatic hydrocarbon; disproportionation alkyl transfer of C8 arene, xylene rectifying unit C9, disproportionation alkyl transfer unit, B/T rectifying unit C8 arene. In calculating the carbon emissions carried over by the recycled material as a raw material, it is necessary to know the carbon footprint data of the recycled material, which is typically obtained after the carbon emissions footprint calculation for the downstream equipment is completed. For example, in calculating the carbon footprint of the xylenes rectification unit product C8 aromatics, it is desirable to know the reformate, isomerized C8 aromatics and disproportionated transalkylation C8 aromatics feedstock carry-over emissions, the reformate carbon footprint emissions data may be calculated from the refinery production process, while the isomerized C8 aromatics and disproportionated transalkylation C8 aromatics feedstock carbon emissions data may be obtained from the downstream isomerization unit and disproportionated transalkylation unit carbon footprint data that would be difficult to obtain without performing the upstream xylenes rectification unit carbon footprint calculation.
Therefore, in order to overcome the contradiction, the development of a new method for evaluating the carbon footprint of the product of the paraxylene production process has practical significance.
In view of this, the present invention has been made.
Disclosure of Invention
The first object of the invention is to provide a method for evaluating the carbon footprint of a product in a paraxylene production process, which sets the carbon footprint data value of a raw material with known carbon footprint data as an iteration initial value on the premise of comprehensively considering the life cycle, and continuously iterates and judges the calculation process and the calculation result through a loop iteration method, so as to finally obtain more accurate, more reliable and more practical carbon footprint data, and provide more practical and scientific guidance for realizing the transition from actual production to low carbon.
The second object of the invention is to provide the application of the evaluation method in evaluating the carbon footprint of the product of the aromatic hydrocarbon co-production process.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
a method of evaluating the carbon footprint of a para-xylene production process product, comprising:
setting the carbon footprint data value of the raw material with known carbon footprint data as an iteration initial value, and calculating the carbon footprint data of the product according to the circulation path of the material in the production process;
when the error between the calculated product carbon footprint data and the set initial value meets the requirement, the related calculation result is the material carbon footprint data of the paraxylene production process;
when the difference between the calculated product carbon footprint data and the set iteration initial value does not meet the requirement, carrying out the next iteration again until the error of two adjacent iteration calculation meets the requirement;
and obtaining carbon footprint data of the paraxylene production process product by a cyclic iteration method.
Optionally, the paraxylene production process comprises a xylene rectification unit, an adsorption separation unit, an isomerization unit, a disproportionation transalkylation unit and an aromatic hydrocarbon extraction unit.
Alternatively, the flow of material in the para-xylene production process is shown in FIG. 1.
The xylene rectifying unit is used for separating the raw material reformate, the C8+ aromatic hydrocarbon from the disproportionation unit and the C8+ aromatic hydrocarbon from the isomerization unit into reformate C6-C7 fractions, the C8+ adsorption separation raw material, the C9 aromatic hydrocarbon and the heavy aromatic hydrocarbon, and the ortho-xylene product can be separated by aromatic hydrocarbon combination units of some enterprises. The reformed oil C6-C7 fraction is sent to an aromatic hydrocarbon extraction unit, the C9 aromatic hydrocarbon is sent to a disproportionation alkyl transfer unit, and the heavy aromatic hydrocarbon is taken as a product sending device.
The adsorption separation unit is used for separating mixed C8 aromatic hydrocarbon of the xylene rectification unit into extract (p-X product) and raffinate (mixed C8 aromatic hydrocarbon) by an adsorption and desorption method, wherein the raffinate mainly comprises m-xylene and o-xylene, and the m-xylene and the o-xylene need to be sent to an isomerization unit to be converted into p-xylene.
The isomerization unit is used for converting the C8 aromatic hydrocarbon (raffinate) lean in para-xylene from the adsorption separation unit into the C8 aromatic hydrocarbon which tends to balance the para-xylene under the action of hydrogen and a catalyst.
The aromatic hydrocarbon extraction device takes the C6-C7 fraction of the reformate as a raw material to produce benzene/toluene mixed aromatic hydrocarbon and raffinate oil; wherein the raffinate oil is taken as a product sending device, and the benzene/toluene mixed aromatic hydrocarbon is sent to a benzene/toluene fractionation unit of a disproportionation and alkyl transfer unit for product rectification.
The disproportionation alkyl transfer unit takes benzene/toluene mixed aromatic hydrocarbon extracted from aromatic hydrocarbon and C9/C10 aromatic hydrocarbon rectified from dimethylbenzene as raw materials, produces high-quality C8 aromatic hydrocarbon with low ethylbenzene content through disproportionation and alkyl transfer reaction, and sends the high-quality C8 aromatic hydrocarbon to the dimethylbenzene rectification unit, and meanwhile byproducts of benzene, a small amount of light hydrocarbon and fuel gas are produced.
Optionally, the carbon footprint data value of the raw material of the xylene rectifying unit is set as an iterative initial value of isomerized C8 aromatic hydrocarbon and disproportionated alkyl transfer C8 aromatic hydrocarbon, and the product carbon footprint data of the xylene rectifying unit, the adsorption separation unit and the isomerization unit are calculated.
Optionally, the carbon footprint data value of the feedstock to the xylene rectification unit is a carbon footprint data value of a reformate.
Optionally, the carbon footprint data value of the reformate is calculated by an upstream refinery process.
Optionally, when the calculated value of the calculated isomerized C8 aromatic carbon footprint meets the requirement with the error of the iterative initial value, the calculated value is continuously used for calculating the product carbon footprints of the disproportionation transalkylation unit and the aromatic extraction unit.
Optionally, when the calculated value of the isomerized C8 aromatic hydrocarbon carbon footprint obtained by calculation and the error of the iteration initial value do not meet the requirement, setting the calculated value as a new iteration initial value, performing a new round of iterative calculation until the error of the isomerized C8 aromatic hydrocarbon carbon footprint data calculated in two adjacent iterations meets the requirement, stopping iteration, and setting the calculated value of the isomerized C8 aromatic hydrocarbon carbon footprint when stopping iteration as the iteration initial value of the product carbon footprints of the disproportionation alkyl transfer unit and the aromatic hydrocarbon extraction unit.
Alternatively, the calculated value of the product carbon footprint of the disproportionation transalkylation unit and the aromatic extraction unit is considered to be the paraxylene production process product carbon footprint when the error of the calculated value from the initial iteration value meets the requirements.
Optionally, when the errors between the calculated values of the obtained product carbon footprints of the disproportionation alkyl transfer unit and the aromatic hydrocarbon extraction unit and the iteration initial value do not meet the requirement, setting the calculated values as new iteration initial values, performing a new round of iteration calculation, stopping iteration until the errors of two adjacent iteration calculations meet the requirement, and considering the calculated values at the time of stopping iteration as the product carbon footprints of the paraxylene production process.
Alternatively, when the error is not greater than 0.5kgCO 2 At/t, the requirements are considered to be satisfied.
As one embodiment of the invention, as shown in FIG. 2, a method for evaluating the carbon footprint of a para-xylene production process product comprises:
setting the carbon footprint value of the raw material (reformate) of the xylene rectifying unit as the carbon footprint value of the isomerized C8 aromatic hydrocarbon and the disproportionated alkyl transfer C8 aromatic hydrocarbon, calculating the carbon footprint data of the products of the xylene rectifying unit, the adsorption separation unit and the isomerization unit to obtain the carbon footprint value of the isomerized C8 aromatic hydrocarbon, comparing the carbon footprint value with a set initial value (or the last iteration value), and continuously calculating the carbon footprints of the products of the extraction unit and the disproportionated alkyl transfer unit when the error meets certain requirements; otherwise, the calculated carbon footprint value of the isomerized C8 aromatic hydrocarbon is brought into a xylene rectifying unit to carry out the next iteration calculation again until the errors of the previous iteration and the subsequent iteration meet the requirements.
After the carbon footprint data of the isomerized C8 aromatic hydrocarbon is converged, the carbon footprints of the products of the extraction unit and the disproportionation alkyl transfer unit can be calculated, the disproportionation alkyl transfer C8 aromatic hydrocarbon is compared with a set initial value (or a last iteration value), and when the error meets a certain requirement, the carbon footprint data of the derived material flow is the carbon footprint of the product; and otherwise, substituting disproportionation alkyl transfer C8 aromatic carbon footprint data into a xylene rectifying unit to perform next round of iterative computation until the errors of the previous and the next two iterations meet the requirements.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the method for evaluating the carbon footprint of the product in the paraxylene production process, provided by the invention, on the premise of comprehensively considering the full life cycle, the carbon footprint data value of the raw material with known carbon footprint data is set as the iteration initial value, the calculation process and the calculation result are continuously iterated and judged through the loop iteration method, and finally, more accurate, more reliable and more close to the actually produced carbon footprint data is obtained, and more practical and more scientific guidance is provided for realizing the actual production to the low-carbon transformation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of materials in a para-xylene production process in one embodiment of the present invention;
FIG. 2 is a graph showing the evaluation of the carbon footprint of a product produced by an aromatics complex in accordance with one embodiment of the invention;
FIG. 3 is a graph of the carbon footprint of a process feed for producing para-xylene from an aromatics complex in accordance with one embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
A60 ten thousand ton/year para-xylene (p-X) unit is composed of units such as aromatic hydrocarbon extraction, xylene rectification, isomerization, adsorption separation, disproportionation transalkylation and the like, as shown in figure 1. Fig. 2 and 3 are a process diagram for evaluating the carbon footprint of a product produced by an aromatic hydrocarbon unit and a process diagram for producing paraxylene by an aromatic hydrocarbon unit, respectively. The raw materials comprise C6+ reforming generated oil and outsourcing mixed xylene; the main products include para-xylene, gasoline blending components, benzene, heavy aromatics, crude toluene and fuel gas, while ortho-xylene can be produced. Wherein the capability of the xylene rectifying device is 385 ten thousand tons/year, the capability of the adsorption separation device is 327 ten thousand tons/year, and the processing capability of the isomerization device is 266 ten thousand tons/year. The material balance data and plant carbon emission data are shown in table 1.
Table 1 aromatics complex material balance table
TABLE 2 emission data for energy use of aromatics complex
The carbon footprint of the reformate feedstock calculated from the upstream refinery process is 604.18kgCO 2 T, therefore, the carbon footprint of the isomerized C8 aromatics and the disproportionated transalkylation of C8 aromatics is set to 604.18kgCO 2 And/t, the calculated material carbon footprint data are shown in Table 2.
748.73kg CO due to isomerized C8 aromatic carbon footprint data in Table 2 2 T and set point 604.18kgCO 2 The difference in/t is relatively large, and therefore 748.73kg CO 2 The/t was taken into the xylene rectification unit feedstock, isomerized C8 aromatics, and the stream carbon footprint was recalculated, with the results shown in Table 3.
As can be seen from Table 3, after the first iteration, the isomerized C8 aromatic carbon footprint data was 828.66kgCO 2 T, and the last iteration result 748.73kgCO 2 The difference of/t is large, so the iterative process is repeated until the two adjacent results are similar, the values of which are shown in Table 4.
As can be seen from Table 4, the convergence of the carbon footprint data for isomerized C8 aromatics is 927.26kg CO 2 At the moment, the carbon footprint data of the isomerized C8 aromatic hydrocarbon serving as the raw material of the xylene rectifying unit is 927.05kg CO 2 And/t, the difference error between the two is less than 0.5kg CO 2 And/t, the convergence result is good.
When the carbon footprint data of the isomerized C8 aromatic hydrocarbon is converged, 985.94kgCO of the carbon footprint data of the disproportionated C8+ aromatic hydrocarbon is calculated 2 T, and a set initial value of 604.18kg CO 2 The difference in/t is relatively large, and therefore, 987.94kg CO 2 The/t was taken into the xylene rectification unit feedstock, disproportionated C8 aromatics, and the stream carbon footprint was recalculated, with the results shown in Table 5.
As can be seen from Table 5, the disproportionated C8 aromatic carbon footprint data is 1032.37kgCO 2 T, and first iteration value 985.94kg CO 2 The difference of/t is larger, and the carbon footprint data of the isomerized C8 aromatic hydrocarbon is as follows: 973.83kg CO 2 T, and isomerization first convergence value (927.26 kg CO 2 T) differ considerably. Therefore, the carbon footprint data of isomerized C8 aromatic hydrocarbon is 973.83kg CO 2 Substitution of/t into xylene monomerThe raw materials were recalculated until they met the convergence condition, and the results are shown in table 6.
As can be seen from Table 6, the convergence of the carbon footprint data of the isomerized C8 aromatic hydrocarbon at this time was 1031.42kg CO 2 At the moment, the carbon footprint data of the isomerized C8 aromatic hydrocarbon serving as the raw material of the xylene rectifying unit is 1031.2kg CO 2 And/t, the difference error between the two is less than 0.5kg CO 2 And/t, the convergence result is good.
When the isomerized C8 aromatic hydrocarbon converges, the disproportionated C8 aromatic hydrocarbon carbon footprint calculation can be performed, i.e., 1089.79 is substituted into the xylene fractionation unit raw material, i.e., disproportionated C8 aromatic hydrocarbon, until both the isomerized C8 aromatic hydrocarbon and the disproportionated C8 aromatic hydrocarbon meet the convergence condition, and the results are shown in table 7.
TABLE 3 carbon footprint data for aromatics complex stream (one iteration result for isomerizing C8 aromatics)
TABLE 4 carbon footprint data for aromatic hydrocarbon complex stream (first convergence of isomerized C8 aromatic hydrocarbon results)
TABLE 5 carbon footprint data for aromatics complex stream (disproportionation of C8 aromatics first iteration result)
TABLE 6 aromatic hydrocarbon complex stream carbon footprint data (convergence of isomerized C8 aromatics under first iteration of disproportionated C8 aromatics)
TABLE 7 carbon footprint data for aromatic hydrocarbon complex streams (results of disproportionation of C8 aromatic hydrocarbons and isomerization of C8 aromatic hydrocarbons all converged)
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A method for evaluating the carbon footprint of a product of a paraxylene production process, characterized in that,
the paraxylene production process comprises a xylene rectification unit, an adsorption separation unit, an isomerization unit, a disproportionation alkyl transfer unit and an aromatic hydrocarbon extraction unit;
the carbon footprint data value of the raw material of the xylene rectifying unit is the carbon footprint data value of the reformed oil; the carbon footprint data value of the reformate is calculated and obtained by an upstream oil refining production process;
the method comprises the following steps:
setting the carbon footprint data value of the raw material with known carbon footprint data as an iteration initial value, and calculating the carbon footprint data of the product according to the circulation path of the material in the production process;
when the error between the calculated product carbon footprint data and the set initial value meets the requirement, the related calculation result is the material carbon footprint data of the paraxylene production process;
when the difference between the calculated product carbon footprint data and the set iteration initial value does not meet the requirement, carrying out the next iteration again until the error of two adjacent iteration calculation meets the requirement;
obtaining carbon footprint data of a product in the paraxylene production process by a cyclic iteration method;
when the error is not more than 0.5kg CO 2 At/t, the requirements are considered to be satisfied;
the method for the next round of iteration comprises the following steps: and setting the calculated value as a new iteration initial value, and carrying out a new round of iteration calculation.
2. The method according to claim 1, wherein the carbon footprint data value of the raw material of the xylene rectifying unit is set to an iterative initial value of isomerizing C8 aromatic hydrocarbons and disproportionating transalkylation C8 aromatic hydrocarbons, and the product carbon footprint data of the xylene rectifying unit, the adsorption separation unit, and the isomerization unit is calculated.
3. The method of claim 2, wherein when the calculated value of the calculated isomerized C8 aromatic carbon footprint meets the requirement for an error from the initial iteration value, the calculated value is continued to be used to calculate product carbon footprints of the disproportionation transalkylation unit and the aromatic extraction unit.
4. The method according to claim 2, wherein when the calculated value of the calculated isomerized C8 aromatic hydrocarbon carbon footprint and the error of the iteration initial value do not meet the requirement, the calculated value is set as a new iteration initial value, a new round of iterative calculation is performed until the error of the isomerized C8 aromatic hydrocarbon carbon footprint data calculated in two adjacent iterations meets the requirement, the iteration is stopped, and the calculated value of the isomerized C8 aromatic hydrocarbon carbon footprint at the time of stopping the iteration is set as an iteration initial value for calculating the product carbon footprints of the disproportionation transalkylation unit and the aromatic hydrocarbon extraction unit.
5. The method according to claim 3 or 4, characterized in that the calculated value of the product carbon footprint of the obtained disproportionation transalkylation unit and the aromatic extraction unit is regarded as p-xylene production process product carbon footprint when the error of the calculated value from the initial iteration value meets the requirements.
6. The method according to claim 3 or 4, wherein when the calculated values of the product carbon footprints of the obtained disproportionation alkyl transfer unit and the aromatic hydrocarbon extraction unit and the error of the iteration initial value do not meet the requirement, the calculated values are set as new iteration initial values, a new round of iteration calculation is performed until the error of two adjacent iteration calculation meets the requirement, the iteration is stopped, and the calculated values at the time of stopping the iteration are regarded as the product carbon footprints of the paraxylene production process.
7. Use of the method for evaluating the product carbon footprint of a para-xylene production process according to any of the claims 1 to 6 for evaluating the product carbon footprint of an aromatic hydrocarbon co-production process.
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| CN105375472A (en) * | 2015-11-23 | 2016-03-02 | 国家电网公司 | Intelligent power distribution network low-carbon benefit evaluation method |
| CN107451387A (en) * | 2016-05-30 | 2017-12-08 | 中国石油化工股份有限公司 | A kind of metering method of petroleum chemicals carbon footprint |
| CN107844875A (en) * | 2016-09-19 | 2018-03-27 | 京东方科技集团股份有限公司 | Green product management system and method |
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