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Method for detecting residual acrylamide monomer in cationic polyacrylamide

A technology of acrylamide monomer and polyacrylamide, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of shortening pretreatment time, long pretreatment time, cumbersome steps, etc., and achieve ideal extraction effect

Active Publication Date: 2015-10-14
浙江友联化学工业有限公司
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  • Application Information

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Problems solved by technology

[0008] The pretreatment of cationic polyacrylamide samples in Chinese patent CN 102590121A is obtained by immersing in a solvent for 24 hours, and the pretreatment time is relatively long; when measuring with a UV spectrophotometer, the volume ratio of the extract must be repeatedly adjusted, and the steps are relatively cumbersome; Chinese patent CN 103439447A uses ultrasonic extraction to extract residual acrylamide monomers. Although this method shortens the time for sample pretreatment, the method is aimed at the detection of anionic or nonionic polyacrylamide residual monomers. Anionic or nonionic polypropylene Amide is soluble in water and is formed by the copolymerization of highly hydrophilic acrylamide and acrylate, and is insoluble in organic solvents. Therefore, any organic solvent can be selected for the extraction of anionic or nonionic polyacrylamide residual monomers that are miscible with water. For extraction, cationic polyacrylamide introduces a cationic quaternary ammonium salt hydrophobic group, which makes it soluble in some organic solvents, which makes the extraction process of cationic polyacrylamide much more complicated than anionic or nonionic polyacrylamide

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  • Method for detecting residual acrylamide monomer in cationic polyacrylamide
  • Method for detecting residual acrylamide monomer in cationic polyacrylamide
  • Method for detecting residual acrylamide monomer in cationic polyacrylamide

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Experimental program
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Embodiment 1

[0046] Take about 5g of cationic polyacrylamide samples with cationic degrees of 5%, 10%, 15%, 20%, 30%, 40%, and 70%, respectively, and dissolve them in 50mL of mixed solvents of ethanol and water with different volume ratios. extraction, the results are shown in Table 1:

[0047] Table 1

[0048]

[0049]

[0050] It can be seen from Table 1 that in the extractant of CPAM with a cationic degree of 5-10%, when the volume ratio of ethanol to water is 0-65:100-35, the solubility of polyacrylamide in the extract is increased due to the large proportion of water. The increase makes the colloid viscous and difficult to extract; when the volume ratio of ethanol to water is 71-100:29-0, the solubility of polyacrylamide in the extraction solution decreases due to the large proportion of ethanol, resulting in the colloid being hard on the outside and soft on the inside. , the sample is not completely swollen, the residual acrylamide monomer is not completely extracted, and the ...

Embodiment 2

[0071] Take by weighing cationic degree is respectively 5%, 10%, 15%, 20%, 30%, 40%, 70% CPAM sample 2g left and right, with the optimal extractant 20mL (ethanol and water) of corresponding cationic degree among the embodiment 1 ) to prepare a polyacrylamide mixture, put the 7 mixtures in an ultrasonic cleaner, adjust the ultrasonic power to 0-50W, and ultrasonicate for 60min, 90min, and 120min respectively, then filter the supernatant, dilute it 10 times, and place it at room temperature for 30min. , measure its absorbance at 220nm place of ultraviolet spectrophotometer, and measured result is as shown in table 4:

[0072] Table 4

[0073]

[0074] Again, the CPAM sample 2g that takes by weighing cation degree is respectively 5%, 10%, 15%, 20%, 30%, 40%, 70% is about, and the optimum extractant 20mL (ethanol) of corresponding cation degree among the embodiment 1 and water) to prepare a polyacrylamide mixture, and ultrasonically extract the 7 mixtures in an ultrasonic clea...

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Abstract

The invention discloses a method for detecting a residual acrylamide monomer in cationic polyacrylamide. The method comprises the following steps: preparing a 0.01-0.15g / mL mixture from a polyacrylamide sample with the cationic degree being 5-70% and an extractant; extracting the residual acrylamide monomer by using ultrasonic waves to obtain an extracting solution; filtering supernate of the extracting solution, diluting, and measuring the absorbancy of the diluted supernate on an ultraviolet spectrophotometer; and calculating the content of the residual acrylamide monomer in the cationic polyacrylamide by combining an acrylamide standard curve. The method can be used for extracting and detecting the residual acrylamide monomer in water treatment agents, namely the polyacrylamide, with different cationic degrees, and formed colloid has the elasticity; the extracting solution is clear; the extracting of the residual acrylamide monomer is complete and fast; and the content detection is accurate, needed devices are simple, energy is saved, the extracting method is simple and convenient, short in time, and high in extracting efficiency, and requirements on the detection of the residual acrylamide monomer in the polyacrylamide with the different cationic degrees in different sludge-sewage industries can be met.

Description

technical field [0001] The invention belongs to the field of detection of residual acrylamide monomer content, and in particular relates to a detection method of residual acrylamide monomer in cationic polyacrylamide. Background technique [0002] With the development of science and technology and the improvement of human living standards, people have put forward higher and higher requirements for water quality, which naturally promotes the rapid development of water treatment technology and science. The use of polyacrylamide (PAM) to treat wastewater has a history of more than 60 years. The water treatment flocculant polyacrylamide includes cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide and zwitterionic polyacrylamide. In recent years, as the sources of wastewater have become more and more complex, the treatment has become more and more difficult, and cationic polyacrylamide has many advantages such as high stability and good water solubility, so i...

Claims

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Application Information

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IPC IPC(8): G01N21/33
Inventor 杨青波靳琳琳马国林金丰富
Owner 浙江友联化学工业有限公司
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