Method for analyzing chlorine forms in pyrolysis products of medical waste

Abstract

The present application relates to the field of analytical chemistry, and particularly relates to a method for analyzing chlorine forms in pyrolysis products of medical waste. The method comprises: for the pyrolysis gas of medical waste, sequentially analyzing the total amount of hydrogen chloride, the total amount of chlorine gas and the total amount of light organic chlorine in the pyrolysis gas; for the pyrolysis oil of medical waste, respectively analyzing the total amount of hydrogen chloride, the total amount of inorganic chlorine except hydrogen chloride and the total amount of heavy organic chlorine in the pyrolysis oil; for the pyrolysis coke of medical waste, respectively analyzing the total amount of soluble chlorine and the total amount of insoluble chlorine in the pyrolysis coke. The above scheme quantitatively identifies the chlorine forms and contents in the three-state products, solves the problems of complex chlorine forms in the pyrolysis products of medical waste and the inability to accurately measure the content of each chlorine form, and provides a scientific basis for subsequent pollutant treatment and disposal and product resource utilization of the pyrolysis products of medical waste.

Description

Technical Field

[0001] This invention relates to the field of analytical chemistry, and in particular to a method for analyzing the chlorine speciation in the pyrolysis products of medical waste. Background Technology

[0002] Medical waste has a high chlorine content, mainly originating from disinfectants, saline solutions, and medical waste containing PVC components. After pyrolysis, the chlorine in medical waste decomposes, transforms, and migrates into the pyrolysis products. If this chlorine cannot be effectively removed, it will generate large amounts of dioxins and chlorine-containing pollutants during subsequent incineration power generation and resource utilization, significantly increasing treatment costs. High chlorine content also leads to numerous problems such as equipment corrosion and heavy metal leaching.

[0003] In related technologies, the commonly used methods for determining gaseous chlorine include solution absorption, while the main methods for determining chlorine in tar include the oxygen bomb method and the sodium biphenyl conversion method. For solid chlorine, the main method is the solid Ashka combustion method. Since pyrolysis is a complex physicochemical reaction, the distribution of chlorine in different forms is divided into organic and inorganic states. However, related technologies have not focused on the analysis of chlorine forms in the pyrolysis products of medical waste.

[0004] Therefore, there is an urgent need for an analytical method for the chlorine speciation in the pyrolysis products of medical waste to solve the above problems. Summary of the Invention

[0005] This invention describes a method for analyzing the chlorine speciation in the pyrolysis products of medical waste, which can be used to analyze the chlorine speciation in the pyrolysis products of medical waste.

[0006] One embodiment of the present invention provides a method for analyzing the chlorine speciation in the pyrolysis products of medical waste. The pyrolysis products include pyrolysis gas, pyrolysis oil, and pyrolysis coke, comprising:

[0007] For the pyrolysis gas of medical waste, the total amount of hydrogen chloride, total amount of chlorine and total amount of light organic chlorine in the pyrolysis gas were analyzed in sequence.

[0008] For the pyrolysis oil of medical waste, the total amount of hydrogen chloride, the total amount of inorganic chlorine other than hydrogen chloride, and the total amount of heavy organic chlorine in the pyrolysis oil were analyzed respectively.

[0009] For the pyrolysis coke of medical waste, the total soluble chlorine and the total insoluble chlorine in the pyrolysis coke were analyzed respectively.

[0010] According to the above embodiments, the sequential analysis of the total hydrogen chloride, total chlorine, and total light organic chlorine in the pyrolysis gas includes:

[0011] A first volume of first pyrolysis gas is extracted from the pyrolysis gas to be analyzed, and the first pyrolysis gas is heated and then sent to an infrared gas analyzer to analyze and obtain the total amount of hydrogen chloride in the pyrolysis gas to be analyzed.

[0012] A second volume of second pyrolysis gas is extracted from the pyrolysis gas to be analyzed. The second pyrolysis gas is then passed sequentially into saturated saline solution and the target mixed solution. The total amount of chlorine in the pyrolysis gas to be analyzed is obtained by ion chromatography.

[0013] A third volume of third pyrolysis gas is extracted from the pyrolysis gas to be analyzed, the third pyrolysis gas is fully combusted, and the combustion products are passed into a sodium hydroxide solution to obtain the total chlorine content in the pyrolysis gas to be analyzed using an ion chromatograph.

[0014] The total amount of light organic chlorine in the pyrolysis gas to be analyzed is obtained by subtracting the total amount of hydrogen chloride and the total amount of chlorine from the total amount of chlorine in the pyrolysis gas.

[0015] According to the above embodiments, the heating temperature of the first pyrolysis gas is 150–220°C; and / or,

[0016] The target mixed solution is a mixed solution comprising sodium bicarbonate and sodium carbonate; and / or,

[0017] The target mixed solution has a pH of 9–10; and / or,

[0018] The concentration of the sodium hydroxide solution is 0.1–0.5 mol / L; and / or,

[0019] The infrared wavelength in an infrared gas analyzer is 1–50 μm.

[0020] According to the above embodiments, the step of fully combusting the third pyrolysis gas includes:

[0021] The third pyrolysis gas is fully combusted under conditions of 850–950°C and pure oxygen.

[0022] According to the above embodiments, the analysis of the total hydrogen chloride, the total inorganic chlorine (excluding hydrogen chloride), and the total heavy organic chlorine in the pyrolysis oil includes:

[0023] The target organic solvent is added to the pyrolysis oil to be analyzed to obtain a liquid mixture;

[0024] Weigh a first mass of the first liquid mixture from the liquid mixture, add deionized water to the first liquid mixture and vortex, so as to use a pH meter to analyze the total amount of hydrogen chloride in the pyrolysis oil to be analyzed and use an ion chromatograph to analyze the total amount of inorganic chlorine in the pyrolysis oil to be analyzed.

[0025] The total amount of inorganic chlorine (excluding hydrogen chloride) in the pyrolysis oil to be analyzed is obtained by subtracting the total amount of inorganic chlorine from the total amount of hydrogen chloride.

[0026] Weigh a second mass of the second liquid mixture from the liquid mixture, burn the second liquid mixture completely, and pass the combustion product into a sodium hydroxide solution to analyze the total chlorine in the pyrolysis oil to be analyzed using an ion chromatograph.

[0027] The total amount of heavy organic chlorine in the pyrolysis oil to be analyzed is obtained by subtracting the total amount of inorganic chlorine from the total amount of chlorine in the pyrolysis oil to be analyzed.

[0028] According to the above embodiments, the target organic solvent is an organic solvent comprising acetone and methanol; wherein the molar ratio of acetone to methanol is 1:1 to 4:1; and / or,

[0029] The concentration of the sodium hydroxide solution is 0.1–0.5 mol / L.

[0030] According to the above embodiments, the complete combustion of the second liquid mixture includes:

[0031] The second liquid mixture is atomized by an injection pump and an atomizer, and then subjected to two-stage combustion in pure oxygen; wherein the temperature of the first stage combustion is 500-700℃, and the temperature of the second stage combustion is 850-1000℃.

[0032] According to the above embodiments, the analysis of the total soluble chlorine and the total insoluble chlorine in the pyrolysis coke includes:

[0033] Deionized water was added to the pyrolysis coke to be analyzed, and the mixture was then subjected to tumbling, shaking and centrifugation to obtain the upper leachate and the lower solid residue.

[0034] The upper leachate was analyzed using ion chromatography to obtain the total soluble chlorine in the pyrolysis oil to be analyzed;

[0035] The lower solid residue is dried, calcium oxide and magnesium oxide are added to the dried lower solid residue and mixed thoroughly, and then a layer of calcium oxide and magnesium oxide is covered on the mixture of solid residue, calcium oxide and magnesium oxide to obtain a solid mixture.

[0036] The solid mixture is heated and burned, and deionized water is added to the product after heating and burning, followed by agitation and vortexing to obtain the target leachate.

[0037] The target leachate was analyzed using ion chromatography to obtain the total amount of insoluble chlorine in the pyrolysis oil to be analyzed.

[0038] According to the above embodiments, the particle size of both calcium oxide and magnesium oxide is less than 0.05 mm; and / or,

[0039] The mass ratio of calcium oxide to magnesium oxide is 1:1 to 3:1; and / or,

[0040] The mass ratio of the lower solid residue to the sum of calcium oxide and magnesium oxide in the solid mixture is 1:10 to 1:20.

[0041] According to the above embodiments, heating and burning the solid mixture includes:

[0042] The solid mixture is subjected to two-stage combustion in pure oxygen; wherein the temperature of the first stage combustion is 550-700°C and the temperature of the second stage combustion is 850-950°C.

[0043] The method for analyzing the chlorine forms in the pyrolysis products of medical waste provided by the embodiments of the present invention solves the problems of complex chlorine forms and inaccurate measurement of the chlorine content in the pyrolysis products by quantitatively identifying the chlorine forms and contents in the three states of pyrolysis products. This provides a scientific basis for the subsequent treatment and disposal of pollutants from the pyrolysis products of medical waste and the resource utilization of the products. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A flowchart illustrating a method for analyzing chlorine speciation in pyrolysis products of medical waste according to one embodiment is shown. Detailed Implementation

[0046] The solution provided by the present invention will now be described with reference to the accompanying drawings.

[0047] Figure 1 A schematic flowchart illustrating a method for analyzing the chlorine speciation in the pyrolysis products of medical waste according to one embodiment is shown. Figure 1 As shown, the pyrolysis products include pyrolysis gas, pyrolysis oil, and pyrolysis coke. The analytical method includes:

[0048] Step S1: For the pyrolysis gas of medical waste, the total amount of hydrogen chloride, total amount of chlorine and total amount of light organic chlorine in the pyrolysis gas are analyzed in sequence.

[0049] Step S2: For the pyrolysis oil of medical waste, the total amount of hydrogen chloride, the total amount of inorganic chlorine other than hydrogen chloride, and the total amount of heavy organic chlorine in the pyrolysis oil are analyzed respectively.

[0050] Step S3: For the pyrolysis coke of medical waste, analyze the total soluble chlorine and the total insoluble chlorine in the pyrolysis coke.

[0051] In this embodiment, by quantitatively identifying the chlorine forms and contents in the three states of pyrolysis products, the problem of the complex chlorine forms in medical waste pyrolysis products and the inability to accurately measure the content of each chlorine form is solved, providing a scientific basis for the subsequent treatment and disposal of pollutants from medical waste pyrolysis products and the resource utilization of the products.

[0052] Each step will be described below.

[0053] Regarding step S1:

[0054] In one embodiment of the present invention, the step of "analyzing the total amount of hydrogen chloride, total amount of chlorine and total amount of light organic chlorine in the pyrolysis gas in sequence" may specifically include:

[0055] A first volume of first pyrolysis gas is extracted from the pyrolysis gas to be analyzed, and the first pyrolysis gas is heated and then sent to an infrared gas analyzer to analyze and obtain the total amount of hydrogen chloride in the pyrolysis gas to be analyzed.

[0056] A second volume of second pyrolysis gas is extracted from the pyrolysis gas to be analyzed. The second pyrolysis gas is then passed sequentially into saturated saline solution and the target mixed solution. The total amount of chlorine in the pyrolysis gas to be analyzed is obtained by ion chromatography.

[0057] A third volume of the third pyrolysis gas is extracted from the pyrolysis gas to be analyzed, the third pyrolysis gas is fully combusted, and the combustion products are passed into a sodium hydroxide solution so that the total chlorine in the pyrolysis gas to be analyzed can be obtained by ion chromatography.

[0058] The total amount of light organic chlorine in the pyrolysis gas to be analyzed is obtained by subtracting the total amount of hydrogen chloride and the total amount of chlorine from the total amount of chlorine in the pyrolysis gas.

[0059] In this embodiment, considering the absorption of infrared wavelengths by different forms of chlorine in the pyrolysis gas, the different forms and contents of chlorine in the pyrolysis gas are quantitatively identified by combining infrared spectroscopy, dissolution, and combustion extraction methods. The above methods can accurately obtain the total amount of hydrogen chloride, total amount of chlorine, and total amount of light organic chlorine in the pyrolysis gas to be analyzed. The total amount of light organic chlorine includes chloromethane.

[0060] It should be noted that saturated saline solution can dissolve hydrogen chloride gas but not chlorine gas. Therefore, when using it as a purification method for analyzing the total amount of chlorine, it can yield more accurate analytical results compared to other solutions (such as water).

[0061] It should be noted that the infrared gas analyzer directly analyzes the total amount of hydrogen chloride in the first volume of the first pyrolysis gas, while the ion chromatograph directly analyzes the total amount of chlorine in the second volume of the second pyrolysis gas and the total amount of chlorine in the third volume of the third pyrolysis gas. Assuming that the components in the pyrolysis gas to be analyzed are uniformly distributed, when the total volume of the pyrolysis gas to be analyzed is known, the total amount of hydrogen chloride in the pyrolysis gas to be analyzed can be calculated from the total amount of hydrogen chloride in the first volume of the first pyrolysis gas, the total amount of chlorine in the pyrolysis gas to be analyzed can be calculated from the total amount of chlorine in the second volume of the second pyrolysis gas, and the total amount of chlorine in the pyrolysis gas to be analyzed can be calculated from the total amount of chlorine in the third volume of the third pyrolysis gas.

[0062] In one embodiment of the present invention, the heating temperature of the first pyrolysis gas is 150–220°C; and / or,

[0063] The target mixed solution is a mixed solution comprising sodium bicarbonate and sodium carbonate; and / or,

[0064] The target mixed solution has a pH of 9–10; and / or,

[0065] The concentration of the sodium hydroxide solution is 0.1–0.5 mol / L; and / or,

[0066] The infrared wavelength in an infrared gas analyzer is 1–50 μm.

[0067] In one embodiment of the present invention, the step of "fully combusting the third pyrolysis gas" may specifically include:

[0068] The third pyrolysis gas is fully combusted under conditions of 850–950°C and pure oxygen.

[0069] In this embodiment of the invention, the specific values ​​of each parameter in step S1 are not specifically limited. Of course, the parameters in step S1 can also be other values, which will not be elaborated here.

[0070] Regarding step S2:

[0071] In one embodiment of the present invention, the step of "analyzing the total amount of hydrogen chloride, the total amount of inorganic chlorine other than hydrogen chloride, and the total amount of heavy organic chlorine in the pyrolysis oil" may specifically include:

[0072] The target organic solvent is added to the pyrolysis oil to be analyzed to obtain a liquid mixture;

[0073] Weigh a first mass of the first liquid mixture from the liquid mixture, add deionized water to the first liquid mixture and vortex, so as to use a pH meter to analyze the total amount of hydrogen chloride in the pyrolysis oil to be analyzed and use an ion chromatograph to analyze the total amount of inorganic chlorine in the pyrolysis oil to be analyzed.

[0074] The total amount of inorganic chlorine (excluding hydrogen chloride) in the pyrolysis oil to be analyzed is obtained by subtracting the total amount of inorganic chlorine from the total amount of hydrogen chloride.

[0075] Weigh a second mass of the second liquid mixture from the liquid mixture, burn the second liquid mixture completely, and pass the combustion products into a sodium hydroxide solution to analyze the total chlorine in the pyrolysis oil to be analyzed using an ion chromatograph.

[0076] The total amount of heavy organic chlorine in the pyrolysis oil to be analyzed is obtained by subtracting the total amount of inorganic chlorine from the total amount of chlorine in the pyrolysis oil to be analyzed.

[0077] In this embodiment, considering the leaching properties of different forms of chlorine in pyrolysis oil, and combining methods such as dissolution and combustion extraction, the different forms and contents of chlorine in the pyrolysis oil are quantitatively identified. The above method can accurately obtain the total amount of hydrogen chloride, the total amount of inorganic chlorine other than hydrogen chloride, and the total amount of heavy organic chlorine in the pyrolysis oil to be analyzed. The total amount of heavy organic chlorine includes chlorine-containing polymers, which will not be elaborated here.

[0078] In one embodiment of the present invention, the target organic solvent is an organic solvent comprising acetone and methanol; wherein the molar ratio of acetone to methanol is 1:1 to 4:1; and / or,

[0079] The concentration of the sodium hydroxide solution is 0.1–0.5 mol / L.

[0080] In this embodiment, acetone has better solubility for pyrolysis oil produced from weakly polar materials (such as plastics), while methanol has better solubility for pyrolysis oil produced from strongly polar materials (such as biomass such as medical gauze and cotton swabs). Therefore, adding organic solvents including acetone and methanol to the pyrolysis oil can extract more inorganic and organic chlorine.

[0081] In one embodiment of the present invention, the step of "fully combusting the second liquid mixture" may specifically include:

[0082] The second liquid mixture is atomized by an injection pump and an atomizer, and then subjected to two-stage combustion in pure oxygen; wherein the temperature of the first stage combustion is 500-700℃, and the temperature of the second stage combustion is 850-1000℃.

[0083] In this embodiment, considering the potential risk of explosion during combustion of the second liquid mixture, it can be atomized by an injection pump and atomizer before combustion. Furthermore, considering that direct high-temperature combustion of the second liquid mixture may result in incomplete combustion of the chloromethane in the product, which would affect the analytical results, the inventors creatively performed a two-stage combustion of the second liquid mixture in pure oxygen to obtain more accurate analytical results.

[0084] In this embodiment of the invention, the specific values ​​of each parameter in step S2 are not specifically limited. Of course, the parameters in step S2 can also be other values, which will not be elaborated here.

[0085] Regarding step S3:

[0086] In one embodiment of the present invention, the step of "analyzing the total soluble chlorine and the total insoluble chlorine in the pyrolysis coke" may specifically include:

[0087] Deionized water was added to the pyrolysis coke to be analyzed, and the mixture was then subjected to tumbling, shaking and centrifugation to obtain the upper leachate and the lower solid residue.

[0088] The total soluble chlorine in the pyrolysis oil to be analyzed was obtained by analyzing the upper leachate using ion chromatography.

[0089] The lower solid residue is dried, calcium oxide and magnesium oxide are added to the dried lower solid residue and mixed thoroughly, and then a layer of calcium oxide and magnesium oxide is covered on the mixture of solid residue, calcium oxide and magnesium oxide to obtain a solid mixture.

[0090] The solid mixture is heated and burned, and deionized water is added to the product after heating and burning, and the mixture is turned and shaken to obtain the target leachate;

[0091] The total amount of insoluble chlorine in the pyrolysis oil to be analyzed was obtained by analyzing the target leachate using ion chromatography.

[0092] In this embodiment, considering the leaching properties and thermal stability of different forms of chlorine in pyrolysis coke, and combining methods such as dissolution and combustion extraction, the different forms and contents of chlorine in pyrolysis coke are quantitatively identified. The above method can accurately obtain the total amount of hydrogen chloride, the total amount of inorganic chlorine other than hydrogen chloride, and the total amount of heavy organic chlorine in the pyrolysis oil to be analyzed. The total amount of heavy organic chlorine includes chlorine-containing polymers, which will not be elaborated here.

[0093] In addition, adding calcium oxide and magnesium oxide to the dried lower solid residue and mixing them thoroughly, and then covering the mixture of solid residue, calcium oxide and magnesium oxide with another layer of calcium oxide and magnesium oxide, can effectively fix the hydrogen chloride produced by heating and combustion, generating calcium chloride and magnesium chloride.

[0094] In one embodiment of the present invention, the particle size of both calcium oxide and magnesium oxide is less than 0.05 mm; and / or,

[0095] The mass ratio of calcium oxide to magnesium oxide is 1:1 to 3:1; and / or,

[0096] The mass ratio of the lower solid residue in the solid mixture to the sum of calcium oxide and magnesium oxide is 1:10 to 1:20.

[0097] In one embodiment of the present invention, the step of "heating and burning the solid mixture" may specifically include:

[0098] The solid mixture is subjected to two-stage combustion in pure oxygen; the temperature of the first stage combustion is 550-700℃, and the temperature of the second stage combustion is 850-950℃.

[0099] In this embodiment, considering that the chloromethane in the product may not be completely burned if the solid mixture is directly burned at high temperature, which will affect the analysis results, the inventors creatively carried out a two-stage combustion of the solid mixture in pure oxygen to obtain more accurate analysis results.

[0100] In summary, the analytical method for chlorine speciation in the pyrolysis products of medical waste provided by this invention can utilize the absorption, leaching, and thermal stability of different chlorine speciations to infrared wavelengths in the pyrolysis products, combined with infrared spectroscopy, dissolution, and combustion extraction methods, to quantitatively identify the chlorine speciation and content in the three states of pyrolysis products. This solves the problems of complex chlorine speciation in the pyrolysis products of medical waste and the inability to accurately measure the content of each chlorine speciation, providing a scientific basis for the subsequent treatment and disposal of pollutants from the pyrolysis products of medical waste and the resource utilization of the products.

[0101] The foregoing has described specific embodiments of the invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0102] The various embodiments in this invention are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0103] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for analyzing the chlorine speciation in the pyrolysis products of medical waste, wherein the pyrolysis products include pyrolysis gas, pyrolysis oil, and pyrolysis coke, characterized in that, include: For the pyrolysis gas of medical waste, the total amount of hydrogen chloride, total amount of chlorine and total amount of light organic chlorine in the pyrolysis gas were analyzed in sequence. For the pyrolysis oil of medical waste, the total amount of hydrogen chloride, the total amount of inorganic chlorine other than hydrogen chloride, and the total amount of heavy organic chlorine in the pyrolysis oil were analyzed respectively. For the pyrolysis coke of medical waste, the total soluble chlorine and the total insoluble chlorine in the pyrolysis coke were analyzed respectively; The analysis of the total hydrogen chloride, total chlorine, and total light organic chlorine in the pyrolysis gas includes: A first volume of first pyrolysis gas is extracted from the pyrolysis gas to be analyzed, and the first pyrolysis gas is heated and then sent to an infrared gas analyzer to analyze and obtain the total amount of hydrogen chloride in the pyrolysis gas to be analyzed. A second volume of second pyrolysis gas is extracted from the pyrolysis gas to be analyzed. The second pyrolysis gas is then passed sequentially into saturated saline solution and the target mixed solution. The total amount of chlorine in the pyrolysis gas to be analyzed is obtained by ion chromatography. A third volume of third pyrolysis gas is extracted from the pyrolysis gas to be analyzed, the third pyrolysis gas is fully combusted, and the combustion products are passed into a sodium hydroxide solution to obtain the total chlorine content in the pyrolysis gas to be analyzed using an ion chromatograph. The total amount of light organic chlorine in the pyrolysis gas to be analyzed is obtained by subtracting the total amount of hydrogen chloride and the total amount of chlorine in the pyrolysis gas to be analyzed. The heating temperature of the first pyrolysis gas is 150~220℃; The target mixed solution is a mixed solution comprising sodium bicarbonate and sodium carbonate; The pH of the target mixed solution is 9-10; The concentration of the sodium hydroxide solution is 0.1~0.5 mol / L; The infrared wavelength in the infrared gas analyzer is 1~50μm; The analysis of the total hydrogen chloride, total inorganic chlorine (excluding hydrogen chloride), and total heavy organic chlorine in the pyrolysis oil includes: The target organic solvent is added to the pyrolysis oil to be analyzed to obtain a liquid mixture; Weigh a first mass of the first liquid mixture from the liquid mixture, add deionized water to the first liquid mixture and vortex, so as to use a pH meter to analyze the total amount of hydrogen chloride in the pyrolysis oil to be analyzed and use an ion chromatograph to analyze the total amount of inorganic chlorine in the pyrolysis oil to be analyzed. The total amount of inorganic chlorine (excluding hydrogen chloride) in the pyrolysis oil to be analyzed is obtained by subtracting the total amount of inorganic chlorine from the total amount of hydrogen chloride. Weigh a second mass of the second liquid mixture from the liquid mixture, burn the second liquid mixture completely, and pass the combustion product into a sodium hydroxide solution to analyze the total chlorine in the pyrolysis oil to be analyzed using an ion chromatograph. The total amount of heavy organic chlorine in the pyrolysis oil to be analyzed is obtained by subtracting the total amount of inorganic chlorine from the total amount of chlorine in the pyrolysis oil to be analyzed. The target organic solvent is an organic solvent including acetone and methanol; wherein the molar ratio of acetone and methanol is 1:1 to 4:1; The concentration of the sodium hydroxide solution is 0.1~0.5 mol / L.

2. The analytical method according to claim 1, characterized in that, The complete combustion of the third pyrolysis gas includes: The third pyrolysis gas is fully combusted under conditions of 850~950℃ and pure oxygen.

3. The analytical method according to claim 1, characterized in that, The complete combustion of the second liquid mixture includes: The second liquid mixture is atomized by an injection pump and an atomizer, and then subjected to two-stage combustion in pure oxygen; wherein the temperature of the first stage combustion is 500~700℃, and the temperature of the second stage combustion is 850~1000℃.

4. The analytical method according to claim 1, characterized in that, The analysis of the total soluble chlorine and total insoluble chlorine in the pyrolysis coke includes: Deionized water was added to the pyrolysis coke to be analyzed, and the mixture was then subjected to tumbling, shaking and centrifugation to obtain the upper leachate and the lower solid residue. The upper leachate was analyzed using ion chromatography to obtain the total soluble chlorine in the pyrolysis oil to be analyzed; The lower solid residue is dried, calcium oxide and magnesium oxide are added to the dried lower solid residue and mixed thoroughly, and then a layer of calcium oxide and magnesium oxide is covered on the mixture of solid residue, calcium oxide and magnesium oxide to obtain a solid mixture. The solid mixture is heated and burned, and deionized water is added to the product after heating and burning, followed by agitation and vortexing to obtain the target leachate. The target leachate was analyzed using ion chromatography to obtain the total amount of insoluble chlorine in the pyrolysis oil to be analyzed.

5. The analytical method according to claim 4, characterized in that, The particle size of both calcium oxide and magnesium oxide is less than 0.05 mm; and / or, The mass ratio of calcium oxide to magnesium oxide is 1:1 to 3:1; and / or, The mass ratio of the lower solid residue to the sum of calcium oxide and magnesium oxide in the solid mixture is 1:10 to 1:

20.

6. The analytical method according to claim 4, characterized in that, The heating and combustion of the solid mixture includes: The solid mixture is subjected to two-stage combustion in pure oxygen; wherein the temperature of the first stage combustion is 550~700℃ and the temperature of the second stage combustion is 850~950℃.

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