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.

Effect of Different Alcohols and Palm and Palm Kernel (Palmist) Oils on Biofuel Properties for Special Uses

Abstract: The properties of biodiesel are determined by its oleaginous composition and the alcohol used in the transesterification. This study was performed using palm and palmist oils and methyl, ethyl, isopropyl, and benzyl alcohols to investigate their influence on the cold flow properties, density, and viscosity of the resulting biofuel. The products were also characterized by 1H nuclear magnetic resonance (NMR) and high-performance liquid chromatography (HPLC) analyses. Biofuel produced from palmist oil had different properties compared to biofuel synthesized from palm oil because of its lower average chain length and lower content of unsaturation. Biodiesel produced with palmist oil and isopropyl alcohol had the lowest values of cold filter plugging point (CFPP) (−16 °C) and density (860 kg/m3). The use of benzyl alcohol yielded a biofuel with high viscosity and density values that do not adhere to any international specifications for biodiesel.

Dehydration and purification of isopropyl alcohol to an ultradry and ultrapure level

Abstract: A method for the on-site reprocessing of isopropyl alcohol used in semiconductor manufacturing, to generate an ultradry and ultrapure isopropyl alcohol. This ultradry and ultrapure isopropyl alcohol is produced through a pervaporation step, followed by double distillation. In the first distillation step, an autonomous azeotropic self-stripping distillation column is used to produce an ultradry and partially purified isopropyl alcohol. In the next step, the isopropyl alcohol is distilled in an overhead product distillation column, to produce an ultrapure and ultradry isopropyl alcohol. Alternatively, if the feed isopropyl alcohol contains less than 2000 ppm water, the pervaporation step may be omitted. The resulting isopropyl alcohol has between a high of 100 parts per million (ppm) and a low of 0.1 ppm of water in the isopropyl alcohol. It also has zero particles per milliliter of a size larger than 2.0 microns, zero to 2 particles per milliliter of a size of 0.5 micron to 2.0 microns, zero to 30 particles per milliliter of a size between 0.1 microns and 0.5 microns, an unspecified number of particles per milliliter below 0.1 microns, 1 part per trillion (ppt) to 1 part per billion (ppb) of any specific trace impurity such as metals, anions, and cations, and 10 ppt to 10 ppm of any other specific trace organic substances.

Ultrasonic absorption properties of solutions. Part 5.—Mixtures of water + n-propyl alcohol and water + isopropyl alcohol

Abstract: The ultrasonic absorption properties of water + n-propyl alcohol mixtures at 0, 10 and 20, and water + isopropyl alcohol at 0 and 20°C are reported over the frequency range 1.5 to 230 MHz. For both systems, there is no excess absorption at low alcohol concentrations but the absorption increases rapidly at higher concentrations, passing through a maximum. The relaxation curves have been analyzed using two relaxation frequencies. Both low and high relaxation frequencies for both mixtures have minima in the same mole fraction region where the relaxation strengths have maxima.