Determination method of fatty acid methyl ester in biodiesel wastewater
A technology for fatty acid methyl ester and biodiesel, which is applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of narrow sample volume range, more time consumption, sample volume limitation, etc., and achieves short operation time and high enrichment multiple. , the effect of simple operation
Active Publication Date: 2022-01-14
ZHEJIANG UNIV OF TECH
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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 terminate 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-dissol...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for the determination of fatty acid methyl esters in biodiesel wastewater. The method combines microwave-assisted demulsification with dispersion liquid-liquid microextraction technology for the first time, and overcomes the disadvantage of using centrifugation for demulsification in the traditional dispersion liquid-liquid microextraction method. The problem is that it has the characteristics of simple operation, high enrichment multiple, and short time consumption. Using microwave radiation demulsification technology, the emulsion can be quickly clarified without additional centrifugal equipment. The invention is easy to operate and short in operation time, and can be applied For the pretreatment operation of samples with different volumes, the application of the present invention can be combined with practice, and it is a new method capable of rapidly and efficiently extracting and analyzing fatty acid methyl esters in 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 ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 李祖光赵奕萍俞国伟王夏君
Owner ZHEJIANG UNIV OF TECH