Lecture_4_Mass_and_Mole_Fractions (1).pptx - Chapter 3 Process and Process Variables Processes and Process Variables • Process – operation(s by

# Lecture_4_Mass_and_Mole_Fractions (1).pptx - Chapter 3...

• Notes
• 27

This preview shows page 1 - 10 out of 27 pages.

Chapter 3: Process and Process Variables
Processes and Process Variables Process – operation(s) by which a particular objective is accomplished Input or feed – material that enters a process Output or product – material that leaves a process Processes occur in process units. Multiple process streams may enter or leave a process. Chemical engineers are involved in the design and operation of processes
Sample Process Butter Sugar Flour Cookies
A Refinery Process
Mass and Volume Density = mass per unit volume (g/cm 3 ) Specific volume = volume per unit mass (cm 3 /g) (inverse of density) Densities of pure solids and liquids are essentially independent of pressure and vary slightly with temperature Perry’s and Felder and Rousseau are great references for finding densities
Density – an excellent conversion factor The density of CCl 4 is 1.595 g/cm 3 . What is the volume occupied by 6.20 lb m of CCl 4 ? (Note: 1 lb m = 454 g) 6.20 lb m 454 g 1 cm 3 = 1760 cm 3 1 lb m 1.595 g
Specific Gravity Specific gravity is the ratio of the density of a substance to the density of a reference substance at a specific condition SG = ρ / ρ ref
Specific Gravity The most common reference for solids and liquids is water at 4 °C ρ H 2 O(l) (4 °C) = 1.000 g/cm 3 = 1000. kg/m 3 = 62.43 lb m /f 3
Specific Gravity To convert a substance’s SG to its density, simply multiply the SG by the reference density. Example: What is the density in g/cm 3 of a substance with a SG of 0.7?

#### You've reached the end of your free preview.

Want to read all 27 pages?

• Spring '08
• wetzel

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes
Ask Expert Tutors