Adsorption and flotation studies with quartz: Part II. The adsorption of laurate and myristate on quartz

Ahmed, Seddique M.; Cleave, A. B. Van

doi:10.1002/cjce.5450430105

Can J Chem Eng

1965

DOI: 10.1002/cjce.5450430105

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Adsorption and flotation studies with quartz: Part II. The adsorption of laurate and myristate on quartz

Seddique M. Ahmed¹,

A. B. Van Cleave

Abstract: The adsorption of laurate and myristate ions on quartz from solutions containing (1 to 25) × 10−5 gm. ions/liter of adsorbate at different pH values, both in the absence and in the presence of Ca++ ions, has been measured using C14‐labelled compounds as tracers. The results have been correlated with the flotation behavior of quartz as determined by Hallimond tube and bubble pick up techniques.

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High-Pressure Kinetics of Vinyl Polyperoxides

1996

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This is the first report on studies carried out in detail on high-pressure oxygen copolymerization (>50 psi) of the vinyl monomers styrene and R-methylstyrene (AMS). The saturation pressure of oxygen for AMS oxidation, hitherto obscure, is found to be 300 psi. Whereas the ease of oxidation is more favorable for styrene, the rate and yield of polyperoxide formation are higher for AMS. This is explained on the basis of the reactivity of the corresponding alkyl and peroxy radicals. Below 50 °C, degradation of the poly(styrene peroxide) formed is about 2.5 times less than that observed above 50 °C, so much so that it gives a break in the rate curve, and thereafter the rate is lowered. Normal free radical kinetics is followed before the break point, after which the monomer and initiator exponents become unusually high. This is interpreted on the basis of chain transfer to the degradation products. The low molecular weight of polyperoxides has been attributed to the (i) low reactivity of RO2 • toward the monomer, (ii) chain transfer to degradation products, (iii) facile cleavage of O-O bond, followed by unzipping to nonradical products, and (iv) higher stability of the reinitiating radicals. At lower temperatures, (i) predominates, whereas at higher temperatures, chiefly (ii)-(iv) are the case.

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High-Pressure Kinetics of Vinyl Polyperoxides

1996

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Mechanism of “Autoacceleration” in the Thermal Oxidative Polymerization of α-Methylstyrene

Johnsamuel

Kishore

1997

Macromolecules

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Thermal oxidative polymerization of R-methylstyrene (AMS) has been studied at various temperatures (45-70 °C) and pressures (50-400 psi). Due to its high electron dense double bond, it undergoes thermal oxidative polymerization even at low temperatures fairly easily. The major products are poly(R-methylstyrene peroxide) (PMSP), and its decomposition products are acetophenone and formaldehyde. Above 45 °C the rate of polymerization increases sharply at a particular instant showing an "autoacceleration" with the formation of a knee point. The "autoacceleration" is supported from the fact that the plot of Rp vs T shows a rapid rise, and the plot of ln Rp vs 1/T is non-Arrhenius. The occurrence of autoacceleration is explained on the basis of acetophenone-induced cleavage of PMSP during polymerization, generating more initiating alkoxy radicals, which subsequently leads to the rapid rise in the rate of polymerization. The mechanism of autoacceleration is supported by the change in order, activation energy, and activation volume before and after the knee point.

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Adsorption and flotation studies with quartz: Part II. The adsorption of laurate and myristate on quartz

Cited by 2 publications

References 2 publications

High-Pressure Kinetics of Vinyl Polyperoxides

High-Pressure Kinetics of Vinyl Polyperoxides

Mechanism of “Autoacceleration” in the Thermal Oxidative Polymerization of α-Methylstyrene

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