A coupling process of electrodialysis with oxime hydrolysis reaction for preparation of hydroxylamine sulfate

A coupling process of electrodialysis with oxime hydrolysis reaction for preparing hydroxylamine sulfate was developed in this work.

Correction: A coupling process of electrodialysis with oxime hydrolysis reaction for preparation of hydroxylamine sulfate

Correction for ‘A coupling process of electrodialysis with oxime hydrolysis reaction for preparation of hydroxylamine sulfate’ by Fenggang Guan et al., RSC Adv., 2021, 11, 19238–19247, DOI: 10.1039/D1RA02766B.

Effect of Stabilizer States (Solid Vs Liquid) on Properties of Stabilized Natural Rubbers

The main objective of this work is to study the effect of hydroxylamine sulfate or stabilizer states (solid vs liquid) on the storage hardening of natural rubber (NR). Several types of natural rubber samples were prepared: unstabilized NR samples and stabilized NR samples: (i) dry NR with 0.2 and 2.0 parts per hundred rubber (phr) of dry hydroxylamine sulfate, and (ii) natural latex with 0.2 and 2.0 phr of liquid hydroxylamine sulfate. The samples were characterized immediately (time 0) and after 12 weeks of storage at room temperature, respectively. We found that the Mooney viscosity, gel content, and Wallace plasticity of NR without a stabilizer increases with storage hardening for 12 weeks. However, two types of stabilized NR samples represent constant values of those three parameters, because hydroxylamine sulfate inhibits network and gel formation in NR. Interestingly, the mixing states (solid vs liquid) between natural rubber and the stabilizer affect the properties of stabilized NR. This could be explained by the better dispersion and homogeneous nature of liquid stabilizers in natural latex (liquid state), and thus the higher loading of the stabilizer in the liquid state. This is important, as the stabilization of NR properties as a function of time is required by rubber industry. This study is a utilization model from theory to application.

Synthesis of hydroxylamine sulfate via NO hydrogenation on Pt/graphite catalysts: II. Influence of the reaction conditions and physicochemical state of the catalyst on the product yields

The dependence of the selectivity to products of the commercial process for NO hydrogenation in the H2SO4 solution on process parameters such as the flow rate of the NO + H2 mixture through the reactor, stirring intensity, concentration of the Pt/graphite catalyst in the suspension and temperature was studied. In the process in the mode of external diffusion of the reactant gases, the first or zero order was observed with respect to the catalyst depending on the catalyst concentration in the suspension, the selectivity to the solid products – hydroxylamine sulfates (HAS) and ammonium – being maximal in the transition range. It was shown that the selectivity to HAS increased upon functionalization of the graphite surface with nitrogen-containing groups that led to modifying the adsorbing and catalytic properties of the supported platinum nanoparticles. Specific behavior of platinum catalysts in concentrated suspensions at the limited feeding reactant gases was discussed.

Researches the Process of Formation Salicylaldoxime the Condensation of Salicylaldehyde and Hydroxylamine Sulfate with a Polarographic Control

The use of the polarographic method allows us to trace the condensation of salicylicaldehyde with hydroxylamine sulfate, which results in salicylaldoxime formation. This makes it possible to reduce salicylaldoxime losses occurring as a result of its hydrolysis in the course of salicylamine electrosynthesis, by reduction of salicyloxime forming in the course of salicylicaldehyde and hydroxylamine sulfate condensation. It was found that the rate of salicylic aldehyde and hydroxylamine interaction is high. Salicylicaldehyde completely reacts with hydroxylamine when their molar ratio is equal to 1:5, and salicyloxime is formed with quantitatively yield under these conditions.