CAS number：9003-05-8
molecular formula：C3H5NO
molecular weight：71.0779
EINECS number：231-545-4

English synonyms

acrylamide,polymers;acrylamidehomopolymer;americancyanamidkpam;americancyanamidp-250;aminogenpa;ap273;cyanamerp250;cyanamerp35

Related categories

Petroleum drilling chemicals; chemical additives; water treatment chemicals; flocculants; clarifying agents; separating agents; organic chemicals; hydrophilic polymers; food additives; chemicals for oil and gas development; oilfield chemicals; olefins; chemicals; high Molecular science; sewage treatment; synthetic intermediates; chemical sewage treatment; other biochemical reagents; organic chemical raw materials; organic intermediates; organic chemical raw materials; organic chemical raw materials; fine chemical raw materials; amines;
Polymers;WaterTtreatmentChemicals;Acrylamides;Acrylics;ChemicalbookHydrophilicPolymers;HydrophilicPolymers;MaterialsScience;PolymerScience;Watertreatment;PAM,Watertreatment;inorganic salts;chemical products-inorganic chemicals;chemical intermediates;raw materials;inorganic salts;chemical raw materials;inorganic acids;chemical intermediates Industrial raw materials; chemical materials; water treatment field; water treatment agents; thickeners; bulk goods; additives-coagulants; chemicals; amines; organic raw materials

Introduction

Polyacrylamide is referred to as PAM. It is usually a macromolecule polymer with a head-to-tail bond structure of acrylamide monomers, which is a hard glassy solid at room temperature. Due to different preparation methods, the products include white powder, translucent beads and flakes. The density is 1.302g/cm3 (23℃), the glass transition temperature is 153℃, and the softening temperature is 210℃. Has good thermal stability. Soluble in water, the aqueous solution is clear and transparent, and its viscosity becomes viscous obviously with the increase of the molecular weight of the polymer, and has a logarithmic increase or decrease relationship with the concentration of the polymer. Except for a few solvents such as acetic acid, acrylic acid, chloroacetic acid, ethylene glycol, glycerol and formamide, it is generally insoluble in organic solvents Chemicalbook. It is formed by free radical polymerization of acrylamide monomers, and several methods such as solution polymerization, inverse emulsion polymerization, suspension polymerization and solid state polymerization can be used. The molecular weight of the product is required to be controllable, water-soluble and less residual monomer. Polyacrylamide is one of the most widely used water-soluble polymers, with a large number of pendant amide groups on its molecular backbone. The chemical activity of the amide group is very large, and it can form a series of derivatives with a variety of compounds. Polyacrylamide has various functions such as flocculation, thickening, drag reduction, adhesion, colloid stabilization, film formation and scale inhibition, and is widely used in papermaking, mining, coal washing, metallurgy, oil exploration and other industrial sectors. important chemicals.

Polyacrylamide is relatively stable to heat, its solid is softened at 220-230 °C, and its aqueous solution is significantly degraded after 110 °C. Polyacrylamide is insoluble in benzene, toluene, xylene, gasoline, kerosene, diesel, but soluble in water. Polyacrylamide reacts with alkali to produce partially hydrolyzed polyacrylamide, which produces imidization reaction under strong acidity (pHChemicalbook≤2.5), reducing its solubility in water. It can be cross-linked by polynuclear hydroxyl bridge ions of aldehydes (such as formaldehyde) and high-valent metals (such as aluminum, chromium, zirconium, etc.), and is easily degraded by mechanical and (or) oxygen. In oil production, it is mainly used as oil displacement agent, water blocking agent, profile control agent, viscosity increasing agent, drag reducing agent, water treatment agent, etc.

●  It is used as a flocculant in the water treatment industry. It is also used for the removal of non-dispersed low-solid phase mud in petroleum geological drilling configuration.

●  Settling agent (sugar aid) in sugar industry; film-forming agent.

●  Used as a flocculant for water-based drilling fluids, it can improve the rheological properties of drilling fluids, reduce friction and other functions

●  Used as soil conditioner, flocculant, and used in textile sizing and papermaking reinforcement

●  It is used as a high-efficiency flocculant for neutral and alkaline media, and can be used as a drilling mud additive

●  Used as oil field mud treatment agent, sewage treatment agent, and used for textile sizing and paper reinforcement

●  Polyacrylamide is an important water-soluble polymer, and has valuable properties such as flocculation, thickening, shear resistance, resistance reduction, and dispersibility. These properties vary with the derivative ions. Therefore, it is widely used in oil extraction, mineral processing, coal washing, metallurgy, chemical industry, papermaking, textile, sugar refining, medicine, environmental protection, building materials, agricultural production and other departments.

●  suspending agent. thickener. Gelling agent. flocculant. soil conditioner. Water-soluble resist resin.

●  Widely used in petrochemical, metallurgy, coal, mineral processing, textile and other industrial sectors, used as precipitation flocculant, oilfield water injection thickener, drilling mud treatment agent, textile pulp, paper strengthening agent, fiber modifier, soil conditioner , Soil stabilization agent, fiber paste, resin processing agent, synthetic resin coating, adhesive, dispersant, etc.

●  Acrylonitrile is hydrated under the action of copper catalyst to obtain acrylamide, which is then polymerized into polyacrylamide under the action of K2S2O8. The copper-aluminum alloy is alkali treated and washed to make Cuihua agent, which is put into the hydration reactor, the acrylonitrile raw material is pumped to the storage tank and then put into the measuring tank, the pure water after ion exchange treatment is sent into the measuring tank, and then press The proportional pump is continuously injected into the hydration reactor through the raw material preheater, and the hydration reaction is carried out at 85-125 °C to generate acrylamide aqueous solution. The flash tank flows into the storage tank, and is pumped to the high-level tank to remove the resin exchange column. It enters the storage tank to form a monomer with a concentration of 7-8%, and sends it to the polymerization kettle to make a colloidal polyacrylamide package, which is the finished product.

●  Colloidal polyacrylamide Add 1200kg of deionized water into the hydrolysis kettle, add acrylonitrile, 0.3kg of aluminum hydroxide and copper hydroxide under stirring for composite catalysis, and carry out the hydrolysis reaction at 85-125°C. After the reaction, the unreacted monomer acrylonitrile was distilled off. The acryloyl was prepared into a 7% to 8% chemicalbook solution in water, and added to the polymerization kettle. The polymerization was carried out under the initiation of ammonium persulfate. High molecular weight polyacrylamide hydrolyzes acrylonitrile at 110～140℃ and 0.3MPa to synthesize acrylamide. Add acrylamide into the polymerization kettle that has been filled with deionized water, and react for 8-24 hours under the initiation of 50 mg/kg of ammonium persulfate. Then, under alkaline conditions, the product is obtained by hydrolysis at 70-80°C.

●  A measured amount of acrylonitrile was put into the reaction kettle, and a catalytic amount of copper-based catalyst was added. The temperature was raised to 85-120°C with stirring. The reaction pressure is controlled at 0.29-0.39MPa. In continuous operation, the feed content is controlled at 6.5%. The airspeed is about 5h-1. The acrylamide obtained by the reaction is added to the polymerization kettle, and then a certain amount of deionized water is added. The polymerization reaction was carried out under the initiation of potassium persulfate, and an appropriate amount of 10% sodium bisulfite was added 10 minutes after the start of the reaction. After slowly warming up to 64°C, the reaction mixture was cooled and reacted at 55°C for about 6 h. The unreacted monomer is removed under vacuum at about 80°C under reduced pressure to obtain the finished product.

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