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Heat change

The dominant heating and cooling duties associated with a distillation column are the reboiler and condenser duties. In general, however, there will be other duties associated with heating and cooling of feed and product streams. These sensible heat duties usually will be small in comparison with the latent heat changes in reboilers and condensers. [Pg.341]

U is essential to specify the physical states of the reactants and products, since there may t>e additional heat changes associated with changes in state. [Pg.201]

Hess s law Sometimes called the law of constant heat summation, it states that the total heat change accompanying a chemical reaction is independent of the route taken in reactants becoming products. Hess s law is an application of the first law of thermodynamics to chemical reactions. [Pg.202]

Tetrose (Section 25 3) A carbohydrate with four carbon atoms Thermochemistry (Section 2 18) The study of heat changes that accompany chemical processes Thermodynamically controlled reaction (Section 10 10) Re action in which the reaction conditions permit two or more products to equilibrate giving a predominance of the most stable product... [Pg.1295]

The adiabatic expansion and compression serve only to change the temperature of tire gas widrout heat being absorbed or evolved, i.e. iso-entropic changes. The heat changes are therefore only related to the work which is done during the isothermal stages, which is given by... [Pg.60]

The small value of the entropy change reflects the fact that only liquids are involved in tlris reaction. The heat balance in canying out tlris reaction may be calculted, according to Hess s law, by calculating tire heat change at room temperarnre, and subtracting tire heat required to raise the products to the hnal teirrperamre. The data for tlris reaction are as follows ... [Pg.343]

Difl erential thermal analysis (DTA) and differential scanning calorimetry (DSC) are the other mainline thermal techniques. These are methods to identify temperatures at which specific heat changes suddenly or a latent heat is evolved or absorbed by the specimen. DTA is an early technique, invented by Le Chatelier in France in 1887 and improved at the turn of the century by Roberts-Austen (Section 4.2.2). A... [Pg.241]

Thermal changes resulting from solute interactions with the two phases are definitely second-order effects and, consequently, their theoretical treatment is more complex in nature. Thermal effects need to be considered, however, because heat changes can influence the peak shape, particularly in preparative chromatography, and the consequent temperature changes can also be explored for detection purposes. [Pg.209]

While phenol is the most common monomer for novolac manufacture, it is far more common to see incorporation of other phenolic materials with novolacs than with resoles. Cresols, xylenols, resorcinol, catechols, bisphenols, and a variety of phenols with longer alkyl side chains are often used. While most resoles are made with a single phenolic monomer, two or more phenolic materials are often seen in novolac formulae. These additional monomers may be needed to impart special flow characteristics under heat, change a glass transition temperature, modify cure speed, or to adjust solubility in the application process among others. [Pg.920]

Equivalent hydrostatic pressure Pressure dependence of Curie temperature Change in compressibility Change in specific heat Change in thermal expansion... [Pg.121]

Thermochemistry (Section 2.18) The study of heat changes that accompany chemical processes. [Pg.1295]

Warme-theorie, /. theory of heat, -tisch, m. warming table, -tonung, /. heat effect (of a reaction), heat of reaction, heat change, heat tone. -Ubergang, m. passage of heat, heat transmission, heat transfer, -ubertragimg, /. heat transfer. [Pg.503]

For cooling (or heating) and latent heat change (condense or boil) ... [Pg.74]

Thermoanalytical techniques such as differential scanning calorimetry (DSC) and thermogravi-metric analysis (TGA) have also been widely used to study rubber oxidation [24—27]. The oxidative stability of mbbers and the effectiveness of various antioxidants can be evaluated with DSC based on the heat change (oxidation exotherm) during oxidation, the activation energy of oxidation, the isothermal induction time, the onset temperamre of oxidation, and the oxidation peak temperature. [Pg.469]


See other pages where Heat change is mentioned: [Pg.345]    [Pg.375]    [Pg.393]    [Pg.641]    [Pg.72]    [Pg.86]    [Pg.22]    [Pg.143]    [Pg.134]    [Pg.574]    [Pg.1042]    [Pg.1061]    [Pg.294]    [Pg.98]    [Pg.163]    [Pg.321]    [Pg.344]    [Pg.346]    [Pg.253]    [Pg.191]    [Pg.86]    [Pg.56]    [Pg.74]    [Pg.74]    [Pg.74]    [Pg.909]    [Pg.12]    [Pg.155]    [Pg.396]    [Pg.254]    [Pg.8]    [Pg.68]    [Pg.316]    [Pg.789]    [Pg.111]    [Pg.323]   
See also in sourсe #XX -- [ Pg.292 ]




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7 Muscle foods, heat-induced changes

Cells, reversible heat change

Changes during heating air as the heat transfer medium

Changes during heating oil as the heat transfer medium

Changes during heating water as the heat transfer

Changing Heat Transfer by Bypassing

Chemical thermodynamics heat change

Colour changes on heating

Convective heat and mass transfer. Flows with phase change

Detection of changes during heat

Energy and Change of Temperature Specific Heat

Energy heat change

Enthalpies of Phase Changes, Cohesive Energies, and Heat Capacities

Enthalpy Heats of Reaction and Chemical Change

Enthalpy heat changes

Entropy change heating

Entropy changes accompanying heat flow

Factors Leading to Changing Heat Release Rates

Force changes from heating

HEAT CHANGES AND THERMOCHEMISTRY

Heat Capacities and Property Changes of Formation

Heat Capacity Changes During Transformations

Heat Changes Accompanying Hydration

Heat Involved in Phase Changes A Kinetic-Molecular Approach

Heat capacity change

Heat capacity change problem

Heat capacity change, evolution

Heat capacity enthalpy change calculation with

Heat capacity entropy change

Heat capacity free energy change

Heat capacity, changes during protein

Heat changes at constant pressure the enthalpy

Heat content, change of

Heat effect/change

Heat flow phase changes

Heat of reaction and entropy changes during polymerization

Heat of reaction change

Heat of reaction enthalpy changes

Heat transfer with phase change

Heat transfer without phase change

Heat-induced changes in flavour of milk

Heat-induced changes in milk

Heat-induced color changes

Heated bone structural changes

Heating rate changes

Infrared Spectroscopy and Heat-Induced Changes in Protein Structure

Latent heat of volume change

Liquid phase change with heat

Marker for detection of changes during heat processing and storage

Phase change heat involved

Phase change, heat transfer

Phase change, heat transfer coefficients

Phase change, heat transfer condensation

Phase change, heat transfer mechanisms

Poly heat capacity changes

Poly heat, entropy, and volume change

Pressure change, latent heat

Process Changes for Improved Heat Integration—Summary

Process changes for improved heat

Process changes for improved heat integration

Proteins, changes during heating

Skill 11.1b-Discuss how the transfer of energy as heat is related to changes in temperature

Small heat shock proteins changes

Solids phase change with heat

Specific heat capacity changes

Storage batteries heat changes

Temperature Changes Heat Capacity

Temperature change and heat of reaction

Temperature effects heat capacity change upon

Temperature heat transfer during change

The Influence of a Change in Heat Capacity

The entropy change accompanying heating

Viscosity from heat capacity change

Volume change during heating

Volume change, latent heat

Water phase changes, heat

Water phase changes, heat associated with

Water physical changes with heat

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