Polypropylene fibers synthesis

In the synthesis of the heterocyclic dye 28 [83156-84-7] [49], 2-amino-4-chloro-phenol is diazotized. A solution of 1 -mcthylimidazo 1,5 pyridinc in 10% HC1 is then added dropwise to the diazotation mixture while maintaining the pH at 4—5 with sodium acetate solution. The resulting azo dye is isolated by vacuum filtration and consists of a brown powder that dyes nickel-modified polypropylene fibers in greenish blue shades. 

Finally, it could be mentioned here that the basic idea of hypercrosslinked network synthesis was also appfied to the preparation of porous fibrous sorbents. Liu et al. [278] have suggested grafting of styrene— DVB copolymer to the surface of polypropylene fibers, followed by the post-crosslinking of the grafted copolymer with 4,4 -bis-(chloromethyl)-diphenyl to 100% degree of crosshnking in a mixture of ethylene dichloride, nitrobenzene, and cyclohexane. After being coated with several successive layers of such hypercrosslinked polystyrene, the final fiber material... 

PROPENE The major use of propene is in the produc tion of polypropylene Two other propene derived organic chemicals acrylonitrile and propylene oxide are also starting materials for polymer synthesis Acrylonitrile is used to make acrylic fibers (see Table 6 5) and propylene oxide is one component in the preparation of polyurethane polymers Cumene itself has no direct uses but rather serves as the starting material in a process that yields two valuable indus trial chemicals acetone and phenol... 

Polypropionate synthesis, 20 138 Polypropylene (PP), 20 523-548 24 272. See also Olefin fibers Propylene polymer entries Spheripol technology Spherizone technology advanced material, 2 693 asbestos substitute, 3 314t, 315 can coatings, 26 39 catalyst systems for, 20 525-528 catalyst yield for, 20 531-532 coatings, 7 40 conducting, 7 525... 

Polypropylene terephthalate, sold as Sorona by the DuPont Corporation, is made into fibers used in clothing and other materials. Although 1,3-propanediol, one of the monomers needed for its synthesis, has been prepared from petroleum feedstocks in the past, it is now available from a renewable plant source such as corn. 

The effect of the wetting characteristics of the membrane in the hydrolytic activity of immobilized lipase was evaluated by Bouwer and co-workers [113]. These authors suggested that the larger thickness of the reaction layer in hydrophilic membranes, as compared to hydrophobic membranes, allowed the retention of the full enzyme activity. A lipase adsorbed onto polypropylene membranes in a hollow-fiber system was used for the selective hydrolysis of menhaden oil [112]. The experimental set-up led to the release of about 88% of the fatty acid residues and retention of more than 90% of the aimed eicosapen-taenoic and docosahexaenoic acids in a space-time of 3.5 h, while the half-life of the enzyme, under ideal operational conditions was 170 h. The enzymatic synthesis of an aspartame precursor in an organic-aqueous membrane-assisted two-liquid phase system has been continuously studied by Isono and co-workers [121, 149,156,201]. Productivity was increased from 6.6 to 8.4kgm d [121]. 

The blood-contacting surface of oxygenators has also been modified with the MPC polymer, PMD, with the aim of reducing platelet activation during blood circulation (Sorin Prim02X , Synthesis ). The porous hollow fiber polypropylene membranes that contact the blood were coated with the PMD. ° As the affinity of the dodecyl group on the substrate was strong, and... 

Cyclopentadiene itself has been used as a feedstock for carbon fiber manufacture (75). It is also a component of supported metallocene-alumoxane polymerization catalysts in the synthesis of polyethylene and polypropylene polymers (76), as a nickel or iron complex in the production of methanol and ethanol from synthesis gas (77), and as Group VIII metal complexes for the production of acetaldehyde from methanol and synthesis gas (78). 

Hollow fiber membrane reactors are well known to provide the highest surface-to-volume ratio (Heath and Belfort, 1990). A typical system, as shown in Figure 3.6, consists of a bundle of hollow fibers that are made of hydrophobic microporous polypropylene. A tangential flow membrane has been reported by many investigators and was found to yield good results for lipase catalyzed hydrolysis and ester synthesis (Hoqetal., 1985). 

Acrylonitrile is currently the second largest outlet for propylene (after polypropylene). It is used as a monomer for synthetic fibers and acrylic plastics (thermoplastics and food packaging mainly), AS (acrylonitrile-styrene) resins, and ABS (aerylonitrile-butadiene-styrene) thermoplastics, as well as in the synthesis of acrylamide, adiponitrile, and nitrile elastomers. The manufacture of acrylonitrile is exclusively based on the one-step propylene ammoxidation process. Originally developed by Sohio, Standard Oil Company (now part of BP America), the conventional method used since 1957 employs a fluidized-bed reactor and multicomponent catalysts based on Mo-containing mixed-metal oxides. Over the years, the industrial... 

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