CN-116380824-B - Analysis method for chlorine form in pyrolysis product of medical waste

CN116380824BCN 116380824 BCN116380824 BCN 116380824BCN-116380824-B

Abstract

The invention relates to the technical field of analytical chemistry, in particular to a method for analyzing chlorine form in a pyrolysis product of medical waste. The method comprises the steps of sequentially analyzing the total amount of hydrogen chloride, the total amount of chlorine and the total amount of light organic chlorine in pyrolysis gas aiming at pyrolysis gas of medical waste, 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 pyrolysis oil aiming at pyrolysis oil of the medical waste, and analyzing the total amount of soluble chlorine and the total amount of insoluble chlorine in pyrolysis coke aiming at pyrolysis coke of the medical waste. According to the scheme, the quantitative identification is carried out on the chlorine form and the chlorine content in the pyrolysis tri-state product, so that the problems that the chlorine form in the pyrolysis product of the medical waste is complex and the chlorine content in each form cannot be accurately measured are solved, and scientific basis is provided for the subsequent pollutant treatment and treatment of the pyrolysis product of the medical waste and the recycling of the product.

Inventors

LI AIJUN
ZHANG TONG
HUANG YONGDA
YI LINLIN
HU HONGYUN
YAO HONG

Assignees

华中科技大学

Dates

Publication Date: 20260512
Application Date: 20230413

Claims (6)

1. A method for analyzing chlorine morphology in a pyrolysis product of medical waste, the pyrolysis product comprising pyrolysis gas, pyrolysis oil, and pyrolysis char, comprising: aiming at the pyrolysis gas of medical wastes, sequentially analyzing the total amount of hydrogen chloride, the total amount of chlorine and the total amount of light organic chlorine in the pyrolysis gas; 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 respectively aiming at the pyrolysis oil of the medical waste; Analyzing the total amount of soluble chlorine and the total amount of insoluble chlorine in the pyrolytic coke respectively aiming at the pyrolytic coke of medical wastes; The method sequentially analyzes the total amount of hydrogen chloride, the total amount of chlorine and the total amount of light organic chlorine in the pyrolysis gas, and comprises the following steps: extracting a first volume of first pyrolysis gas from the pyrolysis gas to be analyzed, heating the first pyrolysis gas, and then conveying the first pyrolysis gas to an infrared gas analyzer to analyze and obtain the total amount of hydrogen chloride in the pyrolysis gas to be analyzed; Extracting a second volume of second pyrolysis gas from the pyrolysis gas to be analyzed, sequentially introducing the second pyrolysis gas into saturated saline solution and a target mixed solution, and analyzing by utilizing an ion chromatograph to obtain the total chlorine in the pyrolysis gas to be analyzed; Extracting a third volume of third pyrolysis gas from the pyrolysis gas to be analyzed, fully burning the third pyrolysis gas, and introducing the burned product into sodium hydroxide solution to obtain the total chlorine in the pyrolysis gas to be analyzed by utilizing an ion chromatograph; Sequentially differencing the total chlorine in the pyrolysis gas to be analyzed with the total hydrogen chloride and the total chlorine to obtain the total light organic 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 value 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 1-50 mu m; the analysis of 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 respectively comprises the following steps: adding a target organic solvent into pyrolysis oil to be analyzed to obtain a liquid mixture; Weighing a first liquid mixture with a first mass from the liquid mixture, adding deionized water into the first liquid mixture, turning over and oscillating to obtain the total amount of hydrogen chloride in pyrolysis oil to be analyzed by utilizing pH analysis and the total amount of inorganic chlorine in pyrolysis oil to be analyzed by utilizing ion chromatograph; the total amount of inorganic chlorine in the pyrolysis oil to be analyzed is differed from the total amount of hydrogen chloride, so that the total amount of inorganic chlorine except hydrogen chloride in the pyrolysis oil to be analyzed is obtained; Weighing a second liquid mixture with a second mass from the liquid mixture, fully burning the second liquid mixture, and introducing the burnt product into a sodium hydroxide solution to obtain the total chlorine in pyrolysis oil to be analyzed by utilizing an ion chromatograph; the total amount of chlorine in the pyrolysis oil to be analyzed is differed from the total amount of inorganic chlorine, so that the total amount of heavy organic chlorine in the pyrolysis oil to be analyzed is obtained; the target organic solvent is an organic solvent comprising acetone and methanol, wherein the molar ratio of the acetone to the methanol is 1:1-4:1; the concentration of the sodium hydroxide solution is 0.1 to 0.5mol/L.
2. The method of analysis of claim 1, wherein said substantially combusting the third pyrolysis gas comprises: and fully burning the third pyrolysis gas under the conditions that the temperature is 850-950 ℃ and pure oxygen is adopted.
3. The method of analyzing of claim 1, wherein said substantially combusting said second liquid mixture comprises: and atomizing the second liquid mixture through an injection pump and an atomizer, and then performing 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 method according to claim 1, wherein the analyzing of the total amount of soluble chlorine and the total amount of insoluble chlorine in the pyrolytic coke, respectively, comprises: adding deionized water into pyrolytic coke to be analyzed, and sequentially performing overturn oscillation and centrifugation to obtain upper-layer leaching liquid and lower-layer solid residues; Analyzing the upper layer leaching solution by utilizing an ion chromatograph to obtain the total amount of soluble chlorine in pyrolysis oil to be analyzed; Drying the lower solid residue, adding calcium oxide and magnesium oxide into the dried lower solid residue, fully mixing, and covering a layer of calcium oxide and magnesium oxide on the mixture of the solid residue, calcium oxide and magnesium oxide to obtain a solid mixture; Heating and burning the solid mixture, adding deionized water into the heated and burned product, and turning over and oscillating to obtain target leaching solution; And analyzing the target leaching solution by utilizing an ion chromatograph to obtain the total amount of insoluble chlorine in pyrolysis oil to be analyzed.
5. The method of claim 4, wherein the calcium oxide and magnesium oxide each have a particle size of less than 0.05mm and/or, The mass ratio of the calcium oxide to the magnesium oxide is 1:1-3:1, and/or, The mass ratio of the lower layer solid residue to the sum of calcium oxide and magnesium oxide in the solid mixture is 1:10-1:20.
6. The method of analyzing of claim 4, wherein said heating and combusting said solid mixture comprises: And (3) performing two-stage combustion on the solid mixture 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 ℃.

Description

Analysis method for chlorine form in pyrolysis product of medical waste Technical Field The invention relates to the technical field of analytical chemistry, in particular to a method for analyzing chlorine form in a pyrolysis product of medical waste. Background The medical waste has high chlorine content and mainly comes from sterilizing water, normal saline and medical waste containing PVC components. After pyrolysis, chlorine in medical waste can be decomposed, converted and migrated into pyrolysis products, and if the chlorine cannot be effectively removed, a large amount of dioxin and chlorine-containing pollutants can be generated in the subsequent incineration power generation and resource utilization processes, so that the treatment cost is greatly increased. Meanwhile, the high chlorine content also causes various problems such as equipment corrosion, heavy metal precipitation and the like. In the related art, a solution absorption method is a common measurement method for gaseous chlorine, an oxygen bomb method and a sodium biphenyl conversion method are main measurement methods for chlorine in tar, and a solid Ai Shenka combustion method is main method for chlorine in solid. Since pyrolysis is a complex physicochemical reaction, the morphology distribution of chlorine is divided into an organic state and an inorganic state, and the related art does not pay attention to analysis of the morphology of chlorine in the pyrolysis product of medical waste. Therefore, there is a need for a method for analyzing chlorine morphology in pyrolysis products of medical waste to solve the above problems. Disclosure of Invention The embodiment of the invention describes a method for analyzing the chlorine form in the pyrolysis product of medical waste, which can analyze the chlorine form in the pyrolysis product of medical waste. An embodiment of the present invention provides a method for analyzing a chlorine form in a pyrolysis product of medical waste, the pyrolysis product including pyrolysis gas, pyrolysis oil, and pyrolysis char, comprising: aiming at the pyrolysis gas of medical wastes, sequentially analyzing the total amount of hydrogen chloride, the total amount of chlorine and the total amount of light organic chlorine in the pyrolysis gas; 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 respectively aiming at the pyrolysis oil of the medical waste; the total amount of soluble chlorine and the total amount of insoluble chlorine in the pyrolytic coke are analyzed respectively for pyrolytic coke of medical waste. According to the above embodiment, the analyzing the total amount of hydrogen chloride, the total amount of chlorine and the total amount of light organic chlorine in the pyrolysis gas sequentially includes: extracting a first volume of first pyrolysis gas from the pyrolysis gas to be analyzed, heating the first pyrolysis gas, and then conveying the first pyrolysis gas to an infrared gas analyzer to analyze and obtain the total amount of hydrogen chloride in the pyrolysis gas to be analyzed; Extracting a second volume of second pyrolysis gas from the pyrolysis gas to be analyzed, sequentially introducing the second pyrolysis gas into saturated saline solution and a target mixed solution, and analyzing by utilizing an ion chromatograph to obtain the total chlorine in the pyrolysis gas to be analyzed; Extracting a third volume of third pyrolysis gas from the pyrolysis gas to be analyzed, fully burning the third pyrolysis gas, and introducing the burned product into sodium hydroxide solution to obtain the total chlorine in the pyrolysis gas to be analyzed by utilizing an ion chromatograph; and sequentially making the total chlorine in the pyrolysis gas to be analyzed and the total hydrogen chloride and the total chlorine to obtain the total light organic chlorine in the pyrolysis gas to be analyzed. According to the above embodiment, the heating temperature of the first pyrolysis gas is 150-220 ℃, and/or, The target mixed solution is a mixed solution comprising sodium bicarbonate and sodium carbonate, and/or, The pH value of the target mixed solution is 9-10, and/or, The concentration of the sodium hydroxide solution is 0.1 to 0.5mol/L, and/or, The infrared wavelength in the infrared gas analyzer is 1-50 μm. According to the above embodiment, the fully combusting the third pyrolysis gas includes: and fully burning the third pyrolysis gas under the conditions that the temperature is 850-950 ℃ and pure oxygen is adopted. According to the above embodiment, the analysis of 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, respectively, includes: adding a target organic solvent into pyrolysis oil to be analyzed to obtain a liquid mixture; Weighing