Evaluation method of residual oil hydrocracking conversion degree

Abstract

The invention provides a residual oil hydrocracking conversion degree evaluation method, which comprises: 1, determining the content of a characteristic compound in an aromatic hydrocarbon component in a residual oil raw material, and recording the content as D; 2, carrying out a hydrocracking reaction on the residual oil raw material to obtain a hydrocracking liquid product, determining the content of the characteristic compound in the aromatic hydrocarbon component in the hydrocracking liquid product by using the same method as the step 1, and recording the content as E; 3, the residual oil hydrocracking conversion degree is determined according to the E / D value, and the larger the E / D value is, the higher the residual oil hydrocracking conversion degree is; wherein the characteristic compounds are benzene, naphthalene, phenanthrene, dibenzothiophene and alkyl substitutes thereof. The selected characteristic compound has good representativeness, the chromatographic analysis result of the characteristic compound is easy to identify and process, the proposed parameters and the conversion degree of the residual oil have good relevance, and the method has good operability.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for evaluating the conversion degree of residue hydrocracking, belonging to the technical field of petroleum chemical analysis. BACKGROUND

[0002] With the depletion of light oil resources and the deterioration of heavy oil resources, the demand for heavy oil conversion technology in the oil refining industry has greatly increased. Slurry bed hydrocracking technology uses dispersed catalysts, which has better heat and mass transfer effect compared to traditional fixed bed hydrocracking technology, so it has greatly improved the applicability of processing poor quality residue oil, and can balance the yield and quality of liquid products, so it has received widespread attention from the oil refining industry in recent years. The conversion degree of slurry bed hydrocracking is usually evaluated by the conversion rate of residue oil (distillation range greater than 500℃), which can reflect the cracking degree of residue oil to some extent. However, due to the complexity of the composition of residue oil and the reaction process, although similar residue conversion rates can be achieved by different process conditions, there can be great differences in the molecular composition of the conversion products, which cannot be evaluated by the residue conversion rate to evaluate the reaction conversion degree and predict the potential of further processing and conversion of the products, which also limits the design and optimization of related process and catalyst technology.

[0003] In addition, there is also a method for evaluating the residue hydrocracking process by establishing an accurate model in the prior art.

[0004] Chinese patent CN109815616A relates to a molecular level hydrogenation device simulation and optimization method, which accurately and efficiently simulates and optimizes the hydrogenation device in the refining production process, including hydrogenation refining, hydrogenation modification and hydrocracking device. The invention uses a more accurate molecular level model than the traditional lumped model to describe the physical and chemical and reaction kinetics processes in the hydrogenation reactor; a multi-dimensional catalyst deactivation model is used to describe the activity decline caused by different reasons to different functions of the catalyst; a specific model parameter correction and simulation prediction mode is used to more reasonably allocate the alternating use of model correction and model prediction between the two states; a specific optimization method is used to more quickly and accurately obtain the optimal scheme of the device operating conditions.

[0005] Chinese patent CN115938499A discloses a method and apparatus for optimizing a molecular-level reaction kinetics model of a hydrocracking unit. The optimization method includes: obtaining a reaction kinetics model of the hydrocracking to be optimized; obtaining initial values ​​of reaction paths, where the reaction path reaction rate is a virtual parameter for each reaction rule, used to represent the rate of reaction under each reaction rule; inputting the values ​​of the reaction paths reaction rates into the reaction kinetics model for reaction simulation to obtain product molecular composition data; using the initial values ​​in the first reaction simulation; calculating simulated values ​​of target indicators for the target product based on the product molecular composition data; and optimizing and adjusting the values ​​of the reaction paths reaction rates based on the difference between the simulated and actual values ​​of the target indicators until the target reaction path reaction rate corresponding to a difference lower than a set threshold is obtained.

[0006] However, these methods are complex to develop and require a large amount of raw data to fit the reaction kinetics model. Furthermore, model development requires defining the reaction rules, pathways, and rates, making them suitable for scenarios with fewer reaction pathways and product types. Residue hydrocracking reactions are extremely complex, involving a vast number of reaction pathways, making these methods unsuitable for predicting the extent of slurry-bed hydrocracking reactions. Summary of the Invention

[0007] The main objective of this invention is to provide a method for evaluating the degree of hydrocracking conversion of residue oil, so as to more realistically and effectively evaluate the degree of hydrocracking conversion and further processing and conversion capacity of residue oil, thereby meeting the technical requirements for process design optimization.

[0008] To achieve the above objectives, the present invention provides a method for evaluating the degree of conversion in hydrocracking of residue oil, comprising the following steps:

[0009] Step 1: Determine the content of characteristic compounds in the aromatic components of the residual oil feedstock, denoted as D;

[0010] Step 2: Perform hydrocracking reaction on the residue feedstock to obtain hydrocracking liquid product. Determine the content of the characteristic compound in the aromatic component of the hydrocracking liquid product using the same method as in Step 1, denoted as E.

[0011] Step 3: Determine the degree of hydrocracking conversion of residue oil based on the E / D value. The larger the E / D value, the higher the degree of hydrocracking conversion of residue oil.

[0012] The characteristic compounds are benzene, naphthalene, phenanthrene, dibenzothiophene and their alkyl-substituted derivatives.

[0013] The method for evaluating the degree of conversion of residue hydrocracking as described in this invention is as follows: if the E / D value is less than 2, the degree of conversion of residue hydrocracking is Level 1, indicating that the residue is not converted or slightly converted; if the E / D value is 2 to 4, the degree of conversion of residue hydrocracking is Level 2, indicating that the residue is moderately converted; if the E / D value is greater than 4, the degree of conversion of residue hydrocracking is Level 3, indicating that the residue is highly converted.

[0014] The method for evaluating the degree of hydrocracking conversion of residue oil according to the present invention, wherein the alkyl group in the alkyl-substituted product is methyl or ethyl.

[0015] The method for evaluating the degree of hydrocracking conversion of residue oil according to the present invention, wherein the characteristic compound is the sum of benzene, methylbenzene, dimethylbenzene, trimethylbenzene, tetramethylbenzene, naphthalene, methylnaphthalene, dimethylnaphthalene, trimethylnaphthalene, tetramethylnaphthalene, pentamethylnaphthalene, phenanthrene, methylphenanthrene, dimethylphenanthrene, methyldibenzothiophene, and dimethyldibenzothiophene.

[0016] The method for evaluating the degree of hydrocracking conversion of residue oil according to the present invention includes a method for determining the content of characteristic compounds in the aromatic components of the residue oil feedstock as follows: separating the aromatic components in the residue oil feedstock, and then determining the content of the characteristic compounds in the aromatic components.

[0017] The method for evaluating the degree of hydrocracking conversion of residue oil according to the present invention includes a column chromatography method for separating aromatic components from the residue oil feedstock, and a gas chromatography-mass spectrometry method for determining the content of characteristic compounds in the aromatic components.

[0018] The method for evaluating the degree of hydrocracking conversion of residue oil according to the present invention includes a column filled with neutral alumina used in the column chromatography separation method, wherein the residue oil feedstock is passed through the column chromatography to obtain saturated hydrocarbon components and aromatic hydrocarbon components respectively.

[0019] The method for evaluating the degree of hydrocracking conversion of residual oil according to the present invention includes eluting the chromatography column sequentially with organic solvent A and organic solvent B, wherein organic solvent A is n-heptane or dearomatic petroleum ether, and organic solvent B is toluene.

[0020] The method for evaluating the degree of hydrocracking conversion of residue oil according to the present invention, wherein the eluent obtained by elution with organic solvent A is a saturated hydrocarbon component, and the eluent obtained by elution with organic solvent B is an aromatic hydrocarbon component.

[0021] The method for evaluating the degree of hydrocracking conversion of residual oil according to the present invention, wherein the residual oil is a residual oil feedstock with an API value greater than 10, such as Middle Eastern high-sulfur oil or Russian residual oil.

[0022] The beneficial effects of this invention are:

[0023] The method for evaluating the conversion degree of residue hydrocracking provided by this invention selects representative alkyl-substituted aromatics from the reaction products, obtains their relative content parameters, and classifies the conversion degree of residue oil based on these parameters. It then evaluates the further conversion performance of the residue oil, serving as a necessary prerequisite for optimizing the operating conditions and catalyst design of slurry-bed hydrocracking processes. The selected characteristic compounds are highly representative, and their chromatographic analysis results are relatively easy to identify and process. The proposed parameters show a strong correlation with the conversion degree of residue oil, and the method of this invention has good operability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the separation and determination process of characteristic compounds in residue oil feedstock or hydrocracking liquid products according to one embodiment of the present invention.

[0025] Figure 2 This is a GC-MS total ion chromatogram of the aromatic components in the residual oil feedstock of this invention.

[0026] Figure 3 This is a GC-MS extraction ion chromatogram of some characteristic compounds in the aromatic components of the residual oil feedstock of this invention. Detailed Implementation

[0027] The technical solution of the present invention will be described in detail below. The following embodiments are implemented under the premise of the technical solution of the present invention and a detailed implementation process is given. However, the protection scope of the present invention is not limited to the following embodiments. Structures or experimental methods that do not specify specific conditions in the following embodiments are generally performed under conventional conditions.

[0028] The slurry-bed hydrocracking process for residual oil is a conversion process primarily driven by free radical mechanisms and thermal reactions. The reactions involved mainly include the cracking of alkyl and cycloalkyl groups, the dehydrogenation condensation of aromatics, and isomerization. Although the reaction process is complex and different residual oil feedstocks exhibit significant compositional differences, thermodynamically stable compounds gradually form and accumulate in the conversion products as the degree of conversion increases. Aromatic compounds are an important component of petroleum and heavy oil products, with alkyl-substituted aromatics possessing high thermodynamic stability. Therefore, selecting representative compounds such as benzene, naphthalene, phenanthrene, dibenzothiophene, and their alkyl-substituted derivatives as characteristic molecular markers and utilizing their relative compositions to evaluate the reaction depth of slurry-bed hydrocracking in residual oil is feasible.

[0029] Therefore, the present invention provides a method for evaluating the degree of conversion in hydrocracking of residue oil, comprising the following steps:

[0030] Step 1: Determine the content of characteristic compounds in the aromatic components of the residual oil feedstock, denoted as D;

[0031] Step 2: Perform hydrocracking reaction on the residue feedstock to obtain hydrocracking liquid product. Determine the content of the characteristic compound in the aromatic component of the hydrocracking liquid product using the same method as in Step 1, denoted as E.

[0032] Step 3: Determine the degree of hydrocracking conversion of residue oil based on the E / D value. The larger the E / D value, the higher the degree of hydrocracking conversion of residue oil.

[0033] The characteristic compounds are benzene, naphthalene, phenanthrene, dibenzothiophene and their alkyl-substituted derivatives.

[0034] The method for evaluating the conversion degree of residue hydrocracking in this invention is particularly applicable to slurry-bed hydrocracking of residue. It involves selectively separating and analyzing representative compounds such as benzene, naphthalene, phenanthrene, dibenzothiophene, and their alkyl-substituted derivatives from the reaction products to obtain their relative content parameters. Based on these parameters, the conversion degree of the residue is classified, and its further conversion performance is evaluated. This is a necessary prerequisite for optimizing the operating conditions and catalyst design of the slurry-bed hydrocracking process. The selected characteristic compounds are highly representative, and their chromatographic analysis results are relatively easy to identify and process. The proposed parameters show a strong correlation with the conversion degree of the residue, and the method of this invention has good operability.

[0035] This invention does not specifically limit the type of residual oil; it can be any residual oil feedstock with an API gravity greater than 10, such as Middle Eastern high-sulfur oil or Russian residual oil.

[0036] The characteristic compounds of this invention are benzene and its alkyl-substituted derivatives, naphthalene and its alkyl-substituted derivatives, phenanthrene and its alkyl-substituted derivatives, and dibenzothiophene and its alkyl-substituted derivatives. In one embodiment, the alkyl group in the alkyl-substituted derivative of this invention is methyl or ethyl. This invention does not particularly limit the number of alkyl substituents; it can be 1, 2, 3, 4, etc. In another embodiment, the characteristic compound is the sum of benzene, methylbenzene, dimethylbenzene, trimethylbenzene, tetramethylbenzene, naphthalene, methylnaphthalene, dimethylnaphthalene, trimethylnaphthalene, tetramethylnaphthalene, phenanthrene, methylphenanthrene, dimethylphenanthrene, dibenzothiophene, and methyldibenzothiophene.

[0037] In one embodiment, the method for determining the content of characteristic compounds in the aromatic components of residual oil feedstock is as follows: separating the aromatic components from the residual oil feedstock, and then determining the content of the characteristic compounds in the aromatic components. In another embodiment, the method for separating the aromatic components from the residual oil feedstock is column chromatography, and the method for determining the content of the characteristic compounds in the aromatic components is gas chromatography-mass spectrometry. The column chromatography method follows the separation steps in industry standard NB / SH / T 0509-2010 "Determination of Four Components of Petroleum Asphalt": the chromatography column is packed with neutral alumina, and the residual oil feedstock passes through the chromatography column to obtain saturated hydrocarbon components and aromatic components respectively. The chromatography column is eluted sequentially with organic solvent A and organic solvent B, where organic solvent A is n-heptane or dearomaticated petroleum ether; and organic solvent B is toluene. The eluent obtained by elution with organic solvent A is the saturated hydrocarbon component, and the eluent obtained by elution with organic solvent B is the aromatic component.

[0038] In one specific embodiment, the method for determining the content of characteristic compounds in the aromatic components of residual oil feedstock is as follows:

[0039] A chromatography column was prepared and packed with neutral alumina. The column was wetted with n-heptane, and a certain amount of residual oil feedstock was dissolved in n-heptane and added to the column. Saturated hydrocarbon components and aromatic components were eluted sequentially with organic solvent A and organic solvent B. The aromatic components were concentrated under slight nitrogen purging and analyzed by gas chromatography-mass spectrometry (GC-MS) under specific analytical conditions. Characteristic compound C was selected, and its content in the aromatic components was calculated by integrating the peak area of ​​its mass chromatogram.

[0040] In another embodiment, the amount of neutral alumina packed is 40 g. The amount of product sample separated in a single step is 0.5 g to 1 g. For residue feedstock with good flowability, it can be directly added to the chromatography column; for residue feedstock with poor flowability or no flowability, it is dissolved in n-heptane, preferably, the amount of n-heptane used is 10 mL.

[0041] In another embodiment, the amount of organic solvent A is 70-100 mL, for example, 75 mL, and the amount of organic solvent B is 80-100 mL, for example, 90 mL.

[0042] This invention does not impose any particular limitation on the method for determining the content of characteristic compounds in aromatic components in residual oil feedstock. Other determination methods in the field can also be used as long as the content can be determined.

[0043] Then, the residue feedstock is subjected to a hydrocracking reaction to obtain hydrocracking liquid products. The present invention does not particularly limit the conditions of the hydrocracking reaction.

[0044] The content of the characteristic compounds in the aromatic components of the hydrocracking liquid products can be determined using the same method as in step 1, and will not be repeated here.

[0045] The degree of conversion in residue hydrocracking is determined based on the E / D ratio. A higher E / D ratio indicates a higher degree of conversion. Specifically, if the E / D ratio is less than 2, the degree of conversion is Level 1, indicating unconverted or slightly converted residue, with poor thermodynamic stability of the converted products and high reactivity for further conversion. If the E / D ratio is between 2 and 4, the degree of conversion is Level 2, indicating moderate conversion of residue, with relatively high thermodynamic stability of the products and relatively low reactivity for further conversion. If the E / D ratio is greater than 4, the degree of conversion is Level 3, indicating highly converted residue, with very high thermodynamic stability of the products, and almost no further conversion under typical slurry-bed hydrocracking operating conditions.

[0046] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0047] Examples 1-13

[0048] After mixing the residue feedstock with a slurry-bed oil-soluble molybdenum-based catalyst, the mixture was subjected to slurry-bed hydrocracking under different process conditions. The specific process conditions are shown in Table 1, and the hydrocracking liquid products were obtained.

[0049] Table 1 Process conditions for slurry-bed hydrocracking reaction

[0050]

[0051] The residual oil feedstock and hydrocracking liquid products are processed and measured separately, as follows: Figure 1 As shown, it includes the following steps:

[0052] Prepare a chromatography column, pack it with 40g of neutral alumina, and wet it with n-heptane. Take 0.5g of residue feedstock or hydrocracking liquid product, dissolve it in 10mL of n-heptane, and add it to the chromatography column. Add 80mL of n-heptane to elute the saturated hydrocarbon components. After all the n-heptane has flowed out, replace the receiving cylinder, and then add 80mL of toluene to elute the aromatic components.

[0053] The aromatic hydrocarbon components were concentrated to 1 mL under slight nitrogen purging and analyzed by GC-MS. The injection port temperature was 400℃, and a fused silica capillary column (HP-5MS, 60 m × 0.25 mm × 0.25 μm) was used. The column oven temperature was initially set at 50℃ for 5 min, then increased to 350℃ at a rate of 4℃ / min and held for 20 min. Mass spectrometry was performed using a 70 eV electron impact ionization source at 230℃, with a scan mass range of m / z 35–400 and a scan period of 0.6 s.

[0054] Taking residual oil feedstock as an example, Figure 2 This is the GC-MS total ion chromatogram of aromatic components in residual oil feedstock. The total peak area of ​​the aromatic components can be obtained by integrating and summing the peak areas of all components.

[0055] Figure 3 This is a GC-MS extraction ion chromatogram of some characteristic compounds in the aromatic components of residual oil feedstock, i.e., from... Figure 2 The chromatograms of characteristic compounds were extracted, and the selected characteristic compounds were benzene, methylbenzene, dimethylbenzene, trimethylbenzene, tetramethylbenzene, naphthalene, methylnaphthalene, dimethylnaphthalene, trimethylnaphthalene, tetramethylnaphthalene, phenanthrene, methylphenanthrene, dimethylphenanthrene, dibenzothiophene, and methyldibenzothiophene. The peak areas of each characteristic compound were calculated and summed. The ratio of the sum of the peak areas of characteristic compounds in the residue feedstock to the total peak area of ​​its aromatic components is the content D of the characteristic compounds in the aromatic components of the residue feedstock. The ratio of the sum of the peak areas of characteristic compounds in the residue hydrocracking products to the total peak area of ​​its aromatic components is the content E of the characteristic compounds in the residue hydrocracking products. E / D = F. The D, E, and E / D values ​​were obtained after calculation for Examples 1-13, and the results are shown in Table 2.

[0056] Meanwhile, existing technologies typically use the conversion rate and coking rate of the fraction above 500℃ as the standard for judging the degree of hydrocracking. The specific calculation method for the conversion rate is to obtain the product distillation range distribution through high-temperature simulated distillation, and then calculate the conversion rate of the fraction above 500℃. The coking rate is calculated by determining the toluene insoluble content using the method in national standard GB / T 2292-2018. The conversion rate data above 500℃ and coking rate obtained from the analysis and calculation of hydrocracking liquid products in this embodiment are also listed in Table 2.

[0057] Table 2. Hydrocracking Conversion Data from Examples

[0058]

[0059]

[0060] Comparing Examples 1, 2, 3, and 4 reveals that as temperature increases, the conversion rate of the fraction above 500℃ in the residue hydrocracking products also increases, but this is accompanied by an increase in coking rate. This indicates that more thermal cracking reactions occur before condensation coking occurs. Therefore, the conversion rate above 500℃ is a better indicator of the degree of thermal cracking. Thus, using the conversion rate above 500℃ as an indicator of the degree of hydrocracking conversion in existing technologies is somewhat one-sided. However, comparing the results obtained by calculating the content of characteristic compounds using the method of this invention shows that before the reaction temperature reaches 410℃, the increasing trend of the E / D value is consistent with the conversion rate trend. After reaching 425℃, the E / D value is basically the same as at 410℃, and both are greater than 4. This indicates that the degree of hydrocracking conversion of residue oil is relatively high at 410℃, and almost no further conversion occurs under typical slurry-bed hydrocracking operation conditions. Therefore, the method of this invention can more accurately reflect the degree of conversion of residue oil in hydrocracking.

[0061] Comparative studies of Examples 3, 5, 6, and 7 show that pressure has a relatively small impact on the degree of hydrocracking conversion of residue oil, and the E / D value changes in the same direction as the conversion rate. When the reaction pressure is below 16 MPa, the coking rate is high, and the corresponding E / D value decreases to between 2 and 4. This indicates that when the hydrogen pressure is low, it affects the hydrocracking conversion capacity of some carbon free radicals, leading to condensation reactions between carbon free radicals and resulting in coking. Therefore, the degree of hydrocracking conversion of the residue oil produced is low.

[0062] Similarly, comparing Examples 3, 8, 9, and 10, it can be seen that the reaction time has a significant impact on the degree of conversion of residue hydrocracking, and the trend of E / D value changes is the same as that of conversion rate and coking rate. When the reaction time is less than 1.5 h, the corresponding E / D value decreases to between 2 and 4, indicating that when the reaction time is short, the degree of conversion of residue hydrocracking is level two, the residue is moderately converted, and the product can be further converted. When the reaction time is less than 0.5 h, the corresponding E / D value decreases to 1.7, indicating that when the reaction time is too short, the degree of conversion of residue hydrocracking is level one, the residue is not converted or slightly converted, the thermodynamic stability of the converted product is poor, and it has high activity for further conversion.

[0063] Finally, comparing Examples 3, 11, 12, and 13, it can be seen that the amount of catalyst added has a significant impact on the degree of conversion of residue hydrocracking. The E / D value shows the same trend as the conversion rate but the opposite trend to the coking rate. When the catalyst addition is 500 ppm and 100 ppm, the catalyst's ability to inhibit coking gradually decreases, the coking rate increases, and the corresponding E / D value decreases to between 2 and 4. This indicates that when the catalyst addition is low, the degree of conversion of residue hydrocracking is secondary, indicating moderate conversion of the residue, and the product can be further converted. When no catalyst is added, although the decreasing trend of the conversion rate is not obvious, the coking rate increases dramatically, and the corresponding E / D value decreases to 1.6, indicating that the degree of conversion of the residue hydrocracking product is very low.

[0064] The results show that the degree of product conversion is in good agreement with the operating conditions, and the degree of conversion under different operating conditions can be further compared based on the product conversion parameter value. However, this accurate result cannot be obtained by simply comparing the residue oil conversion rate.

[0065] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the claims of the present invention.

Claims

1. A method for evaluating the degree of conversion of a residue hydrocracking, characterized in that, The method comprises the following steps: Step 1, determining the content of characteristic compounds in the residue feedstock, denoted as D; Step 2, subjecting the residue feedstock to hydrocracking reaction to obtain a hydrocracking liquid product, and determining the content of the characteristic compounds in the hydrocracking liquid product, denoted as E; Step 3, determining the conversion degree of the residue hydrocracking according to the E / D value, wherein the greater the E / D value, the higher the conversion degree of the residue hydrocracking. The characteristic compounds are benzene, naphthalene, phenanthrene, dibenzothiophene and alkyl-substituted products thereof.

2. The method for evaluating the degree of conversion of residual oil hydrocracking according to claim 1, characterized by, If the E / D value is less than 2, the conversion degree of the residue hydrocracking is primary, and the residue is unconverted or slightly converted; if the E / D value is 2-4, the conversion degree of the residue hydrocracking is secondary, and the residue is moderately converted; and if the E / D value is greater than 4, the conversion degree of the residue hydrocracking is tertiary, and the residue is highly converted.

3. The method for evaluating the degree of conversion of residual oil hydrocracking according to claim 1, characterized by, The alkyl group in the alkyl-substituted products is methyl or ethyl.

4. The method for evaluating the degree of conversion of residual oil hydrocracking according to claim 3, characterized by, The characteristic compounds are the sum of benzene, methylbenzene, dimethylbenzene, trimethylbenzene, tetramethylbenzene, naphthalene, methylnaphthalene, dimethylnaphthalene, trimethylnaphthalene, tetramethylnaphthalene, pentamethylnaphthalene, phenanthrene, methylphenanthrene, dimethylphenanthrene, methyl dibenzothiophene and dimethyl dibenzothiophene.

5. The method for evaluating the degree of conversion of residual oil hydrocracking according to claim 1, characterized by, The method for determining the content of the characteristic compounds in the residue feedstock is separating the aromatic hydrocarbon components in the residue feedstock and then determining the content of the characteristic compounds in the aromatic hydrocarbon components.

6. The method for evaluating the degree of conversion of residual oil hydrocracking according to claim 5, characterized by, The method for separating the aromatic hydrocarbon components in the residue feedstock is column chromatography, and the method for determining the content of the characteristic compounds in the aromatic hydrocarbon components is gas chromatography-mass spectrometry.

7. The method for evaluating the degree of conversion of residual oil hydrocracking according to claim 6, characterized by, The column chromatography uses a neutral alumina column, and the residue feedstock is subjected to the column to obtain saturated hydrocarbon components and aromatic hydrocarbon components.

8. The method for evaluating the degree of conversion of residual oil hydrocracking according to claim 7, characterized by, The column is eluted with organic solvent A and organic solvent B in sequence, the organic solvent A is n-heptane or de-aromatized petroleum ether, and the organic solvent B is toluene.

9. The method for evaluating the degree of conversion of residual oil hydrocracking according to claim 8, characterized by, The eluent obtained by eluting with the organic solvent A is the saturated hydrocarbon components, and the eluent obtained by eluting with the organic solvent B is the aromatic hydrocarbon components.

10. The method for evaluating the degree of conversion of residual oil hydrocracking according to claim 1, characterized by, The residue is a residue feedstock with an API degree greater than 10.

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