The Front Cover picture shows crude bis(tetrahydrofurfuryl) ether (BTHFE) before the final fractional distillation. This work demonstrates a synthetic method that allows for tetrahydrofurfuryl ethers with bulky substituents to be produced. The chemical and physical properties of BTHFE make it an interesting compound for use in electrochemical energy storage devices. More information can be foun...

Dioxane and water form a positive homoazeotrope which has an azeotropic decrease in temperature sufficiently large to effect the complete r emoval, by fractional distillation through an efficient column, of water present as an impurity. The boiling-point-composition diagram, including the composition of the vapor in equilibrium with the boiling liquid, was determined. The normal boiling point o...

Distillation is the most widely used separation technique in the chemical process industries. Not all liquid mixtures can be separated by ordinary fractional distillation, however. When the components to be separated of system have relative volatilities of close to 1.00 (i.e. close boiling mixture), separation becomes difficult and expensive because a large number of trays and a high reflux rat...

This article presents a simple method of designing a fractional filter PID controller for second order plus time delay (SOPTD) processes using internal model control (IMC) scheme. There has been limited number of tuning rules for SOPTD processes developed using direct synthesis method and IMC method. The proposed IMC-PID controller using fractional IMC filter results in a controller structure c...

High-puri ty samples of n-heptane and 2,2,4-trimethylpentane have been prepared by synthet ic methods and purified by fractional distillation for use as s tandards in the certification of pr imary reference fuels. One lot of n-heptane was used to prepare s tandard samples for the eomparison of precision heat-capacity calorimeters. T h e details of the syntheses are presented, and the physical p...