Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Organic Peroxide Mixture

The available oxygen content (%) of an organic peroxide mixture is given by the formula ... [Pg.101]

Organic Peroxide Mixture Synonyms Di-Cup R Organic Peroxide Chemical Family Organic Peroxide CAS 80-43-3 Ingredients And Composition Data 99 % Dicumyl Peroxide [peroxide, bis (alpha alpha-dimethylbenzyl)] Specific Gravity 0.9 Vapor Pressure (mm Hg) 0.004 mm Hg at 500 C Physical Description Yellow, acrid color. Material is granular solid at room temperature Flash Point 127 C. In addition to this example, there are a number of other commercially... [Pg.346]

ORGANIC PEROXIDE MIXTURE 2766 28 PHENOXY PESTICIDES, liquid. [Pg.776]

To determine the exact peroxide content of benzoyl peroxide (and of other organic peroxides) the following procedure may be employed. Place about 0 05 g. of the sample of peroxide in a glass-stoppered conical flask add 5-10 ml. of acetic anhydride (A.R. or other pure grade) and 1 g. of powdered sodium iodide. Swirl the mixture to dissolve the sodium iodide and allow the solution to stand for 5-20 minutes. Add 50-75 ml. of water, shake the mixture vigorously for about 30 seconds, and titrate the liberated iodine with standard sodium thiosulphate solution using starch as indicator. [Pg.808]

Initiators, usually from 0.02 to 2.0 wt % of the monomer of organic peroxides or azo compounds, are dissolved in the reaction solvents and fed separately to the kettie. Since oxygen is often an inhibitor of acryUc polymerizations, its presence is undesirable. When the polymerization is carried out below reflux temperatures, low oxygen levels are obtained by an initial purge with an inert gas such as carbon dioxide or nitrogen. A blanket of the inert gas is then maintained over the polymerization mixture. The duration of the polymerization is usually 24 h (95). [Pg.168]

Potassium borohydride is similar in properties and reactions to sodium borohydride, and can similarly be used as a reducing agent for removing aldehydes, ketones and organic peroxides. It is non-hygroscopic and can be used in water, ethanol, methanol or water-alcohol mixtures, provided some alkali is added to minimise decomposition, but it is somewhat less soluble than sodium borohydride in most solvents. For example, the solubility of potassium borohydride in water at 25° is 19g per lOOmL of water (as compared to sodium borohydride, 55g). [Pg.56]

The danger of this reaction depends on the order in which the reagents are introduced. If acid is introduced into the alcohol/peroxide mixture, there can be detonation especially when the medium is heterogeneous. It is assumed that the danger of the reaction is linked to the formation of peroxymonosulphuric acid, which has such an oxidising property that it can react with all organic compounds ... [Pg.253]

S02-cured epoxy resin. Modified epoxy/acrylic resins (1.2 to 1.4% of sand weight) are mixed with organic peroxide (26 to 60% of resin weight), the mixture is blown into the core box and a hardening mechanism similar to the S02 process takes place. [Pg.160]

Emulsions formed from immiscible organic liquids in aqueous peroxide mixtures may behave in the same way as miscible organic liquids, but if the emulsion breaks and separation of the organic phase occurs, passage into an explosive region of the peroxide-water-organic liquid ternary system may occur, and this is potentially very dangerous. [Pg.1634]

SAPIC A process used in metal foundries for curing resin/sand mixtures used in making molds. The resin is usually an unsaturated polyester resin. In the SAPIC process the resin is hardened by means of an organic peroxide, or hydrogen peroxide, which is activated by sulfur dioxide gas when required. [Pg.234]

Both hydrocarbon and fluorocarbon organic peroxides were used to initiate polymerization. The half-lives of several that were used are shown in Table 6.3. The perfluoro-organic peroxides were prepared at temperatures below 0°C by the reaction of the corresponding acyl chloride and sodium peroxide (Scheme 2). Sodium peroxide was formed from an aqueous mixture of sodium hydroxide and hydrogen peroxide. [Pg.85]

The peroxyacids were until relatively recently the most powerful oxidants of all organic peroxides, and it is often unnecessary to isolate them from the mixture of carboxylic acid and hydrogen peroxide used to generate them. The pine lower aliphatic members are explosive (performic, particularly) at high, but not low concentrations, being sensitive to heat but not usually to shock. Dipicolinic acid or phosphates have been used to stabilise these solutions. The detonable limits of peroxyacid solutions can be plotted by extrapolation from known data. Aromatic peroxyacids are generally more stable, particularly if ring substituents are present [1],... [Pg.333]

The addition of phosphine to olefins provides today a generally applicable method for the syntheses of organophosphines. Stiles, Rust and Vaughan were the first to study the reaction systematically. It is catalysed by organic peroxides such as, for example, di-t-butyl peroxide, by a, a -azobis-isobutyro-nitrile by other free radical sources or by exposing the reaction mixture to UV- or X-radiation. The PHj radicals, produced according to Eq. (77), react further with olefins thus producing PH2 radicals continually. [Pg.45]


See other pages where Organic Peroxide Mixture is mentioned: [Pg.236]    [Pg.236]    [Pg.374]    [Pg.375]    [Pg.172]    [Pg.731]    [Pg.236]    [Pg.236]    [Pg.374]    [Pg.375]    [Pg.172]    [Pg.731]    [Pg.99]    [Pg.480]    [Pg.368]    [Pg.497]    [Pg.132]    [Pg.507]    [Pg.54]    [Pg.15]    [Pg.50]    [Pg.80]    [Pg.187]    [Pg.47]    [Pg.233]    [Pg.92]    [Pg.96]    [Pg.306]    [Pg.366]    [Pg.212]    [Pg.73]    [Pg.77]    [Pg.287]    [Pg.51]    [Pg.604]    [Pg.674]    [Pg.689]    [Pg.604]   
See also in sourсe #XX -- [ Pg.346 ]




SEARCH



Organic mixtures

Organic peroxides

© 2024 chempedia.info