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Thermal Anaerobic Degradation

Specific studies of the anaerobic thermal degradation of poly(alkylene naphthalate)s have not been done, but it is most likely that these polymers will degrade via similar pathways to their equivalent... [Pg.47]

Early studies of the thermal degradation of so-called polyarylates were covered by Neiman [100] and Ehlers and co-workers [101]. Since then, several highly aromatic and specifically liquid crystalline (mesogenic) polyesters have been examined in terms of their anaerobic thermal degradation characteristics. These inclnde homopolymers of hydroxybenzoic acids [102-105] copolymers of hydroxybenzoic acid with hydroxynaphthoic acid [105-108] polymers which are essentially copolymers of hydroxybenzoic acid and alkyene terephthalates [107-118] copolymers of hydroxybenzoic acid with other aromatic polyesters [119-122] phenolic and bisphenolic terephthalates [123-127] poly(oxynaphthoate)s [128] and liquid crystal polyesters (LCP) containing unsaturated acids as part of a copolyester chain [129-131]. [Pg.49]

Table 4. Effect of Anaerobic Thermal Degradation of Resin E on Elemental Analysis... Table 4. Effect of Anaerobic Thermal Degradation of Resin E on Elemental Analysis...
Adams, J.B. and Woodman, J.S., Thermal degradation of anthocyanins with particular reference to the 3-glucosides of cyanidin. 2 - Anaerobic degradation of cyanidin-3-rutinoside at 100°C and pH 3.0 in presence of sodium sulfite, J. Sci. Food Agric., 24, 763, 1973. [Pg.275]

The SoilTech anaerobic thermal processor (ATP) technology is a physical separation process that thermally desorbs organics such as polychlorinated biphenyls (PCBs) from soil and sludge. The SoilTech system distills organic contaminants from a solid matrix in an anaerobic environment, thus preventing oxidative degradation of contaminants such as PCBs into more harmful reaction products. Contaminants are collected in an oily condensate, which is disposed. [Pg.974]

Thermal Degradation The term refers to the decomposition or degradation of a material due to exposure to heat or energy. Materials can be thermally degraded into three principal ways anaerobic pyrolysis, oxidative pyrolysis ( smoldering ), and flaming combustion. [Pg.260]

Hazardons aromatics are destroyed by thermal processes that inclnde incineration of the hqnid hydrocarbons or their solntions in combnstible solvents. Anaerobic microbial degradation in the presence of high concentrations of dissolved oxygen in waste-water and oxidation with hydrogen peroxide or ozone in the presence of UV light are some of the methods reported in the hter-atnre to destroy mononnclear aromatics snch as benzene and tolnene. [Pg.517]

Polychloroprene is a family of synthetic mbbers, exhibits good chemical stability, and maintains flexibility over a wide temperature range. It is used in a wide variety of applications, such as laptop sleeves, orthopedic braces, electrical insulation, liquid and sheet applied elastomeric membranes or flashings, and automotive fan belts, and others. Subramaniam et al. studied the thermal degradation of polychloroprene mbber composites based on unmodified and ionic liquid modified multi-walled carbon nanotubes (MWCNTs), in aerobic and anaerobic conditions. They found that the polychloroprene mbber and its composite exhibit three and four... [Pg.173]

Essential oils are produced from dry or fresh plant materials by distillation. Citrus oils are the only essential oils obtained by cold pressing. Several technologies have been developed for their production (1, 3,9,12,26). Dry distillation is a thermal degradation process to obtain tar such as birch, cade, pine, and cedar tars. This process involves applying intense heat to scrap wood material from the top in totally anaerobic condition. Because of thermal degradation, a viscous dark-colored, tarry liquid with a smoky odor separates and collects in a container underneath the vessel. This material separates into two layers in 15-20 days. Tar sinks to the bottom and the oily layer floats on top of water. It contains methanol, acetic acid, and degradation products of lignin (1, 3, 9-14). [Pg.378]

Reversion of sulphur-based crosslinks continues to a problem for NR compounders. Reversion is the thermal degradation of polysulphidic crosslinks leading to a reduction of crosslink density and an introduction of main chain modifications. In practice, reversion leads to a decline in compound physical properties. Reversion occurs when compounds are overcured or when vulcanisates are exposed to anaerobic ageing. Ideally, a... [Pg.131]

In both cases, the samples from contaminated sites were rinsed with a solvent to obtain an extract of contaminated transformer oil. The effects of biological degradation were investigated by using a commercial mixture of microorganisms and pure strain under aerobic and anaerobic condition. In the thermal method, a laboratory plasma system was used to decompose the contaminated transformer oil by a direct injection of the oil extract into the plasma system or by melting the extract samples with power plant fly ash in the plasma reactor. For the contaminated transformer oil both methods showed a destruction efficiency of 99.99% and the products of destruction were environmentally friendly. [Pg.89]


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