Isopropyl alcohol

About: Isopropyl alcohol is a research topic. Over the lifetime, 3064 publications have been published within this topic receiving 27354 citations. The topic is also known as: Rubbing Alcohol & Propan-2-ol.

Preparation of TiO2‐based catalysts with supercritical fluid technology: characterization and photocatalytic activity in CO2 reduction

Abstract: BACKGROUND Titanium dioxide is the photocatalyst par excellence in environmental applications. Nevertheless, over the years various methods aiming to improve its efficiency have been presented. Herein, we report that TiO2 synthesis in supercritical medium can result in a significant enhancement in the rate of CO2 photocatalytic conversion. RESULTS Specifically, catalysts obtained from two titanium precursors (titanium tetraisopropoxide and diisopropoxititanium bis(acetylacetonate)) and two alcohols (ethanol and isopropyl alcohol) by hydrothermal synthesis in supercritical CO2 are shown to exhibit improved properties in comparison with the standard reference catalyst (Degussa P-25, Evonik). CONCLUSION In particular, upgraded characteristics are related to reactants adsorption (higher specific surface areas, presence of surface hydroxyl groups), light absorption and excitation (better absorbance in visible range, lower band gap energy), and charge separation (appropriate morphology and crystallinity). Furthermore, when these catalysts are tested in the photocatalytic reduction of CO2, CO and CH4 production rates 3- and 15.7-fold higher than those corresponding to the commercial catalyst have been found. © 2016 Society of Chemical Industry

Method of extracting nucleic acids and method of detecting specified nucleic acid sequences

Abstract: An improved method of extracting nucleic acids from a sample comprising mixing the sample with a carrier which is at least one member selected from the group consisting of dextran, acrylamide and carboxymethyl cellulose to form a liquid mixture; mixing said liquid mixture with reagent C to render the nucleic acids and the carrier insoluble, said reagent C containing at least one reagent A selected from the group consisting of guanidinium thiocyanate, guanidinium hydrochloride, potassium thiocyanate and sodium thiocyanate and at least one reagent B selected from the group consisting of n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, and tert-amyl alcohol; and separating the insolubilized nucleic acids and carrier from the liquid phase. The method is easier to use than the heretofore practiced procedures, involves a smaller number of steps, can reduce the possibility of aerosol generation, can be implemented within a short time, does not use phenol or chloroform, and yet it achieves a consistent efficiency in the extraction of nucleic acids. Also disclosed is a method of detecting a specified nucleic acid sequence.

Solvent effect on carboxymethylation of cellulose

Abstract: The relationship between the composition of the solvent (water/isopropyl alcohol) and the degree of substitution, viscosity and molecular weight of carboxymethylcellulose (CMC) is investigated. It is found that the alcohol facilitates the destruction of cellulose crystalline structure and the diffusion of the small reagent molecules into the cellulose, which elevates the availability of the reagent for etherification. Because of the weak polarizability of isopropyl alcohol, it helps to keep the the cellulose molecules to be less decomposed by alkali. This results in the increase of the degree of substitution for the CMC and effects the CMC's high resistance to alkali

Opening Furan for Tailoring Properties of Bio-based Poly(Furfuryl Alcohol) Thermoset.

Abstract: This work shows how furan ring-opening reactions were controlled by polymerization conditions to tune the cross-link density in bio-based poly(furfuryl alcohol) (PFA). The influence of water and isopropyl alcohol (IPA) on the polymerization of furfuryl alcohol, and particularly on furan ring-opening, was investigated by means of 13 C NMR and FT-IR spectroscopy. Results indicated that formation of open structures were favored in the presence of solvents, thus leading to modification of the thermo-mechanical properties compared to PFA cross-linked without solvent. Dynamic mechanical analyses showed that when slightly more open structures were present in PFA it resulted in an important decrease of the cross-link density. Despite lower glass-transition temperature and lower elastic modulus for PFA polymerized with solvent, the thermal stability remains very high (>350 °C) even with more open structures in PFA.

Design of a Process for Production of Isopropyl Alcohol by Hydration of Propylene in a Catalytic Distillation Column

Abstract: A novel process flow sheet has been developed for the application of catalytic distillation technology to the production of isopropyl alcohol (IPA) by hydration of propylene. Operation of the catalytic distillation column has been simulated using an equilibrium-stage model for the distillation sections and an equilibrium-reaction model for the catalytic sections. High-purity IPA (99.9mol%) is produced as a liquid product stream from a catalytic distillation column having dual catalyst beds, operating at a pressure of 2 MPa.