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The use of polyacrylamide in the sugar industry

The residual monomer content of polyacrylamide is an important parameter to measure whether it is suitable for the food industry. Polyacrylamide polymers are non-toxic and have been widely used in the international water purification, food industry and sugar industry. However, in the industrial polyacrylamide, it is inevitable that there are trace amounts of unpolymerized acrylamide monomer, which has some toxicity. Therefore, it is necessary to strictly control the residual monomer content in polyacrylamide products. International requirements for drinking water and food industry in the polyacrylamide in the residual monomer content of not more than 0.05%. Foreign famous products this value is less than 0.03%.
The anionic degree of polyacrylamide has a great effect on its use, but its suitable value depends on the kind and nature of the material being treated, and there will be different optimum values in different cases. According to our many years of research and dozens of polyacrylamide samples for comparative testing and analysis, the sugar industry used polyacrylamide anion degree of 22 to 28% is more suitable, and adaptability, can be used for different materials (sugarcane Juice, syrup, red sugar and raw sugar back to the syrup) and different processes (sulfurous acid, carbonic acid and phosphorus float). Foreign production of sugar with polyacrylamide anionic degree in this range. Bennett pointed out that if the treated material has a higher ionic strength (including more inorganic matter), the anionic degree of polyacrylamide used should be higher and vice versa. According to Clark's report, Australia's sugar mills often use 20% anionic polyacrylamide, while the US Florida sugar factory commonly used higher values. Cress et al. Found that the amount of residual polyacrylamide was associated with the original anionic degree of polyacrylamide after adding the flocculant in the cane juice and removing the precipitate. In the ordinary water treatment, often with carboxyl-free polyacrylamide.

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