Method for measuring fatty acid methyl ester in biodiesel wastewater
A technology of fatty acid methyl ester and biodiesel, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of narrow sample volume range, time consumption, sample volume limitation, etc., and achieve fast and efficient extraction and high enrichment multiples , the effect of simple operation
Active Publication Date: 2019-06-14
ZHEJIANG UNIV OF TECH
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Problems solved by technology
In literature reports, dispersion liquid-liquid microextraction is mostly achieved by centrifugation. This process consumes more time. In addition, it also causes potential sample volume limitations, because the centrifuge uses a specific centrifuge tube with a fixed size. , which means that a narrow range of sample volumes can be used
This process is inconvenient especially when testing large sample volumes, which require large-scale centrifuges and the corresponding high costs
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Embodiment 1
[0045] Embodiment 1: the method of fatty acid methyl ester in biodiesel wastewater
[0046] (1) Preparation of biodiesel and its wastewater collection
[0047] 34.7g of soybean oil (Arowana refined first-grade soybean oil was purchased from the local Century Lianhua Supermarket in Hangzhou), 15.4g of methanol and 1g of potassium hydroxide were reacted at 65°C for 6 minutes, and the power of microwave and ultrasonic was set to 600 and 800W respectively . Ultrasound mode adopts 1:0, that is, continuous ultrasound. Then 20 mL of glacial acetic acid was added to stop the reaction. The product was then washed with repeated additions of deionized water. A total of 1000mL of wastewater was collected and stored for future use.
[0048] (2) Preparation of fatty acid methyl ester standard solution
[0049] The standard curve was prepared with simulated wastewater of methyl palmitate and methyl stearate. Since these two methyl esters lack water solubility, they were pre-dissolved i...
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The invention provides a method for measuring fatty acid methyl ester in biodiesel wastewater. According to the method, microwave-assisted demulsification and dispersive liquid-liquid microextractiontechnologies are adopted for the first time to be combined, the problem that in a traditional dispersive liquid-liquid microextraction method, demulsification is conducted by centrifugation is solved,and the characteristics of easy operation, high concentration factor, short consumed time and the like are achieved; a microwave radiation demulsification technology is adopted, and thus an emulsionquickly becomes clarified without additional centrifugal equipment; and the method is easy and convenient to operate and short in operation time, and can be suitable for pretreatment operation of samples with different volumes, by applying the method, reality can be combined, and the novel method can quickly and efficiently extract and analyze the fatty acid methyl ester in the biodiesel wastewater.
Description
(1) Technical field [0001] The invention relates to a method for measuring fatty acid methyl esters in biodiesel wastewater, in particular to a method for analyzing and measuring fatty acid methyl esters in biodiesel wastewater using microwave demulsification dispersion liquid-liquid microextraction technology combined with gas chromatography / mass spectrometry. (2) Background technology [0002] Vegetable oils often contain free fatty acids, phospholipids, sterols, water, off-flavor substances, and other impurities. For these reasons, grease cannot be used directly as fuel. To overcome these problems, a slight chemical modification of the oil is required, mainly transesterification, pyrolysis and emulsification. Among these methods, transesterification is the crucial most important step for producing cleaner and environmentally safe fuels from vegetable oils. Biodiesel is a mono-alkyl ester of long-chain fatty acids derived from renewable feedstocks such as vegetable oils ...
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IPC IPC(8): G01N30/02G01N30/06
Inventor 李祖光赵奕萍俞国伟王夏君
Owner ZHEJIANG UNIV OF TECH