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- The main applications of polyacrylamide(PAM,FLOCCULANT)
The application of PAM technology in sugar
In China's sugar industry using flocculant technology matures, and developed a variety of new air purification process. The sugar industry of our country's technical level and performance of all kinds of flocculants constantly developing and improving.
Polyacrylamide, often abbreviated as PAM (past is abbreviated as PHP). Sugar is used in recent years a variety of PAM, the essence is with a certain proportion of acrylamide and sodium acrylate through copolymerization reaction of the polymer, a series of products.
The molecular weight of PAM is very high, and it has greatly improved in recent years. In 1970s, the application of PAM, the molecular weight is generally millions; after 80 years, the majority of the molecular weight of PAM is more than 15000000, some reached 20000000. Each of the PAM molecular is by more than 1 00000 acrylamide or acrylic acid sodium molecular aggregation and (acrylamide molecular weight was 71, containing hundreds of thousands of monomer of PAM molecular weight is 710 million). Generally, the flocculation performance of high molecular weight PAM is better. The molecular weight of the polymer organic matter, even in the same product is not completely uniform, the nominal molecular weight is the average value of it.
The anion of PAM has great influence on its use, but it is suitable for the numerical value of the material to be treated. Comparison test and analysis, according to our many years of research and logarithmic ten PAM sample, used in the sugar industry of anionic PAM, 22 degrees to 28% more appropriate and strong adaptability, and can be used for different materials (cane juice, syrup, brown sugar and sugar remelt syrup) and different technological processes of (sub sulfuric acid method, method of carbonate and phosphate float). Foreign production of sugar with the majority of the PAM anion in this range. Bennett pointed out that if the ionic strength of the treated material is higher (including inorganic substances), the anion of PAM should be higher, and vice versa. And according to a report by Clark, of Australia's sugar commonly used 20% degree of anion PAM, and Florida sugar commonly used high numerical. Cress research found that in sugarcane juice flocculant is added and removed after sediment and residual volume and PAM PAM original anion is related. And in ordinary water treatment, often with no carboxyl group.(sugar cane juice and syrup) and PAM are after adding phosphoric acid and lime milk neutralization. They reflect the calcium phosphate precipitation is floc, capable of trapping various suspension liquid particles to form larger particles. This is called the first flocculation. On the basis of this, the formation of a larger PAM, called the second flocculation. A good flocculation can significantly improve the effect of PAM two times, and reduce the number of PAM required; because a flocculation has been a small number of particles, greatly reducing the total number of particles, thereby reducing the burden on PAM. Do a good job of flocculation is the basis for the best effect of PAM.
Due to the material composition of various sugar and the process often have different, the most suitable flocculant variety may be different, should contrast experiments were carried out to choose to use. In addition, but also to consider the dissolution of the product, it is appropriate to use more soluble products. In recent years, the majority of PAM products are dry powder, effective ingredients can be calculated by 100%. It is a white powder (or very fine particles), a loose weight of about 0.8. Easier to absorb moisture, water is easy to form a mass, its water solution is very sticky. It should be stored in cool and dry place, packed in plastic bags after opening, should be promptly tied the bag.