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• Chemical engineering


  Study of design and operation of chemical plants
• Chemical engineering


  • Design and troubleshoot chemical process
  • Maximize productivity and product quality
  • Minimize production cost
  • Environmental protection
• Chemical engineers


  Universal engineers
• Chemical process industries


  • Water treatment
  • Fertilizer
  • Pulp and paper
  • Sugar
  • Petroleum
  • Pharmaceuticals
  • Electronics
  • Glass
• Dimension


  A basic concept of measurement. It is a property that can be measured.
• Unit


  Means of expressing the dimension.
• Why is attaching a unit important?

  • Diminish possibility of errors in calculations
  • Reduce intermediate calculations and time in problem solving
  • Have a logical approach to the problem rather than remembering a formula and substituting numbers into it
  • Have easy interpretation of the physical meaning of the numbers you use

• System of units

  A collection of units in which certain units are chosen as fundamental and all others are derived from them.
• Types of systems of units

  • Le Systeme Internationale d'Unites (SI Units)
  • American Engineering System of Units
  • c.g.s. System of Units
  • m.k.s. System of Units
  • f.p.s. System of Units
• Dimensional homogeneity


  Equations must be dimensionally consistent

  
  

  each term in an equation must have the same net dimensions and units as every other term to which it is added, subtracted or equated.
• Scientific notation


  A number is expressed as the product of another (usually between 0.1 and 10) and a power of 10.
• Significant figure


  The digits from the first nonzero digit on the left to either (a) the last digit (zero or nonzero) on the right if there is a decimal point or (b) the last nonzero digit of the number if there is no decimal point.
• When two or more quantities are combined by multiplication and/or division, the number of significant figures in the result should be equal to the lowest number of significant figures of any of the multiplicands or divisors.
• When two or more quantities are added or subtracted, the positions of the last significant figures of each number relative to the decimal point should be compared. Of these positions, the one farthest to the left is the position of the last permissible significant figure of the sum or difference.
• Mole


  A certain amount of material corresponding to a specified number of molecules, atoms, electrons, or any other specified types of particles.
• Avogadro's number


  1 mole = 6.022 x 10^23 molecules
• Molecular weight


  Weight of a given molecule.
• Density


  Substance's mass over volume.
• Specific volume


  Inverse of density.
• Specific gravity


  Ratio of the density of a substance to that of a reference substance (Water at 4degC for liquids and usually air for gases)
• Process


  Any operation or series of operations by which a particular objective is accomplished.
• It is common for processes to consist of multiple steps, each of which is carried out in a process unit, and each process unit has associated with it a set of input and output process streams.
• Flow rate


  For continuous processes, the rate at which material is transported through a pipe.
• Mass flow rate


  Mass (m) transported through a line per unit time (t)
• Volumetric flow rate


  Volume (V) transported through a line per unit time (t)
• Molar flow rate


  Number of moles (n) of a substance transported through a line per unit time (t)
• Mass fraction


  Mass (weight) of a particular compound in a mixture or solution divided by the total mass (weight) of all the compounds in the mixture or solution.
• Mole fraction


  Number of moles of a particular compound in a mixture or solution divided by the total number of moles in the mixture or solution.
• Mole percent


  Mole fraction expressed as a percentage
• Mass percent


  Mass fraction expressed as a percentage