Supercritical drying propane

A further exotic method of extraction for drying solvents is the use of supercritical fluids such as carbon monoxide, propane and butanes. This... 

Acrylamide monomer is a white crystal, available commercially as a 50 wt % aqueous solution. Acrylamide monomer can be polymerized to a very-high-molecular-weight (lO -lO g/mole) homopolymer, copolymer, or terpolymer. Polyacrylamide (PAM) is a nonionic polymer. The anionic polyacrylamide species can be obtained from the hydrolysis of the amide (—CONH ) functional group of the homopolymer, or from the copolymerization of acrylamide with an anionic monomer, such as acrylic acid (AA) or 2-acrylamino 2-methyl propane sulfonic acid (AMPS). Acrylamide can be copolymerized with a cationic monomer, such as dimethyl diallylammonium chloride (DMDAAC) or acryloyloxyethyl trimethyl ammonium chloride (AETAC), to form the cationic acrylamide polymer. Acrylamide can simultaneously react with anionic and cationic monomers to form a polyampholyte. The acrylamide homopolymer, copolymers, and terpolymers are synthesized (1-20) by free radicals via solution or emulsion or other polymerization methods. F. A. Adamsky and E. J. Beckman (21) reported the inverse emulsion polymerization of acrylamide in supercritical carbon dioxide. The product classes of acrylamide polymers include liquid, dry, and emulsion. 

One of the first reactions carried out in a SCF micelle system was the formation of A1(0H)3 from A1(N03)3 and ammonia (76). This mlcroemulsion system consisting of A1(N03)3 dissolved in water, supercritical propane, and surfactant was contacted with dry ammonia to form Al(OH)3. The ammonia, which is soluble in supercritical propane, diffused into the micelles and reacted with the A1(N03)3 in the aqueous phase. Particle size was shown to be a function of concentration. 

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