A method for determining the content of terephthalic acid in copolyester plastics
A technology of terephthalic acid and copolyester, which is applied in measurement devices, material separation, and analysis of materials, etc., can solve the problems of different properties and no characterization.
Active Publication Date: 2022-03-08
浙江省化工产品质量检验站有限公司
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[0006] The application publication number CN110780011A discloses a method for determining the content of phthalic acid in benzoic acid by using high performance liquid chromatography. This invention is different from the sample in the present invention, and no qualitative analysis is carried out during the detection process.
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[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0039] see Figure 1-5 Shown, the present invention is a kind of terephthalic acid content assay method in copolyester plastics, by liquid chromatography-mass spectrometry technology, liquid chromatography (HPLC) analytical technique, determine the content of terephthalic acid in the sample .
[0040] The specific measured substance is terephthalic acid, English name: Terephthalic acid, abbreviated as PTA.
[0041] The substances used in the determination of tere...
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Abstract
The invention discloses a method for determining the content of terephthalic acid in copolyester plastics, belonging to the technical field of terephthalic acid detection. The present invention comprises the following steps: Step 1, preparing a standard solution: taking a sample and dissolving it in dichloromethane, extracting it with N,N-dimethylformamide, and diluting it with methanol. Step 2, liquid chromatography determination; Step 3, obtain the linear function relational expression of terephthalic acid; Step 4, qualitative analysis analyte: liquid chromatography condition: detector: ultraviolet detector; Wavelength: 270nm; Injection volume : 5.00μL; mass spectrometry conditions: ion source: ESI (‑); mass analyzer: quadrupole; capillary temperature: 280°C; spray voltage: 3.50kV; The invention provides an efficient and accurate determination method for terephthalic acid in copolyester plastics.
Description
technical field [0001] The invention belongs to the technical field of terephthalic acid detection, in particular to a method for determining the content of terephthalic acid in copolyester plastics. Background technique [0002] PTA is the English abbreviation of terephthalic acid. It is a white powder crystal at room temperature. It is non-toxic and flammable. If it is mixed with air, it will burn within a certain limit when exposed to fire. [0003] PTA is the lower-end product of petroleum. Petroleum produces naphtha through a certain process, and then extracts mixed xylene from naphtha, and then extracts p-xylene. PTA uses p-xylene as raw material, acetic acid as solvent, and is oxidized by air under the action of a catalyst to generate crude terephthalic acid. Then, the crude terephthalic acid is hydrogenated and refined to remove impurities, and then crystallized, separated, and dried to obtain a refined terephthalic acid product, that is, a finished PTA product. In...
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IPC IPC(8): G01N30/02G01N30/06G01N30/86G01N30/74
CPCG01N30/02G01N30/06G01N30/8679G01N30/74
Inventor 俞霖洁郑育欢冯宇杰唐利斌林梦佳吴傅杰
Owner 浙江省化工产品质量检验站有限公司