Water treatment field
Water treatment includes raw water treatment, sewage treatment and industrial water treatment. Used in conjunction with activated carbon in raw water treatment, it can be used to agglomerate and clarify suspended particles in living water. Using organic flocculant acrylamide instead of inorganic flocculant, even if the sedimentation tank is not modified, the water purification capacity can be increased by more than 20%; in sewage treatment, the use of polyacrylamide can increase the utilization rate of water recycling and can also be used as Sludge dewatering; used as an important formulation agent in industrial water treatment. The largest application of polyacrylamide in foreign countries is water treatment, and domestic applications in this area are being promoted. The main role of polyacrylamide in water treatment:
(1) Reduce the amount of flocculant. Under the premise of achieving the same water quality, the use of polyacrylamide as a coagulant aid in combination with other flocculants can greatly reduce the amount of flocculant used; under the premise of achieving the same water quality, polyacrylamide is used as a coagulant aid and other flocculants Used in conjunction, can greatly reduce the amount of flocculant used;
(2) Improve water quality. In drinking water treatment and industrial wastewater treatment, the use of polyacrylamide in combination with inorganic flocculants can significantly improve water quality;
(3) Improve the strength and settling speed of flocs. The flocs formed by polyacrylamide have high strength and good settling performance, thereby increasing the solid-liquid separation speed, which is conducive to sludge dewatering;
(4) Anti-corrosion and anti-scaling of the circulating cooling system. The use of polyacrylamide can greatly reduce the amount of inorganic flocculants, thereby avoiding the deposition of inorganic substances on the surface of the equipment, and slowing down the corrosion and scaling of the equipment.
Application in oil recovery
Polyacrylamide is a kind of multifunctional oilfield chemical treatment agent. It is widely used in the process of drilling, cementing, completion, workover, fracturing, acidification, water injection, water plugging and profile control, and tertiary oil recovery. It is in the fields of drilling, water plugging and profile control and tertiary oil recovery. Polyacrylamide aqueous solution has high viscosity, good thickening, flocculation and rheological adjustment, and is used as oil displacement agent and drilling mud regulator in petroleum exploitation. In the middle and late stages of oil exploitation, in order to improve oil recovery, our country currently mainly promotes polymer flooding and ternary combined flooding technologies. By injecting an aqueous polyacrylamide solution, the oil-water flow rate ratio is improved, and the crude oil content in the produced material is increased. Adding polyacrylamide to tertiary oil recovery can increase the oil displacement capacity, avoid the breakdown of the oil layer, and increase the oil bed recovery rate. China's petroleum industry is the largest user of polyacrylamide. The technological advancement of polyacrylamide has promoted the development of China's petroleum industry, and the demand of the petroleum industry has accelerated the pace of technological innovation and industry development of polyacrylamide.
Polyacrylamide is widely used as a retention aid, filter aid, leveling agent, etc. in the papermaking field to improve the quality of paper, the dewatering performance of the slurry, the retention rate of fine fibers and fillers, and reduce the consumption of raw materials and environmental pollution. Used as a dispersant to improve the uniformity of paper. Polyacrylamide is mainly used in two aspects in the paper industry. One is to increase the retention rate of fillers and pigments to reduce the loss of raw materials and environmental pollution; the other is to increase the strength of paper. Adding polyacrylamide to the paper material can increase the retention rate of fine fibers and filler particles on the net and accelerate the dehydration of the paper material. The mechanism of polyacrylamide is that the particles in the slurry can be retained on the filter cloth by electric neutralization or bridging and flocculation. The formation of flocs can also make the water in the slurry easier to filter out, reduce the loss of fibers in the white water, reduce environmental pollution, and help improve the efficiency of filtration and sedimentation equipment.
Polyacrylamide gel can be used as a non-thrombin progranulation agent, raw materials for surgery, contact lenses, outer coating of microcapsules, and used to manufacture high-quality hemostatic plugs, sanitary napkins and diapers for children, etc. Polyacrylamide with a particle size of several hundred microns to several tens of microns can be used for chromatographic packing (such as gel chromatography column packing), which can effectively separate spherical proteins such as cytochromes. And can further desalinate and concentrate protein. The polyacrylamide resin undergoes Mannich reaction to introduce L-proline or L-hydroxyproline on the side chain of the amide group via a methylene bridge, and coordinate with the copper ion to obtain a chiral ligand resin. The series of DL-amino acids are effectively resolved. The chiral amino acids on the polyvinylamine resin obtained by Hofmann degradation are then complexed with copper ions and used as the stationary phase of ligand exchange chromatography to resolve a series of amino acids. The resolution of aromatic amino acids is particularly effective. Strong hydrophilicity greatly shortens the resolution time.
In the food industry, it is used for cane juice clarification and syrup phosphorus floatation extraction in the production of cane sugar and beet sugar. Enzyme fermentation broth flocculation and clarification industry, also used for the recovery of feed protein, stable quality and good performance. The recovered protein powder has no adverse effects on the survival rate and weight gain of chickens, and has no adverse effects on egg production. Synthetic resin coatings and civil construction grouting materials are blocked. Water, building materials industry, cement quality improvement, construction industry adhesives, joint repair and water blocking agents, soil improvement, electroplating industry, printing and dyeing industry, etc.