Category Archives: chemistry

Select a fire of significance (one that was in the news, known in history, or one that you are personally familiar with.) Write a synopsis of a couple paragraphs about the fire including the type of occupancy, the cause or suspected cause of ignition if unknown, materials involved, flame spread description, characteristic of spread through the compartments (if compartment fire). Following the synopsis, conduct a scientific analysis of at least three different aspects of the fire using some of the concepts we discussed in class with Heat transfer, Fire load energy density, Heat release rate, T-squared fire growth, Flashover calculation, Fire severity, Steel structures analysis, Concrete Structures analysis and etc. Include more than just narrative descriptions of the analysis, but include diagrams, equations and calculations (the fun stuff)…..

determine the infinite dilution partition coefficient for the drug between water and n-octanol:

A useful method for assessing the extent of the partitioning of a drug between the bloodstream and body fat is to determine the infinite dilution partition coefficient for the drug between water and n-octanol:

Kdrug = xdrug in n-octanol-rich phase / xdrug in water-rich phase

For a drug 3-(4-ethyl phenyl)propanoic acid (the structure is below),

a. Use UNIFAC to determine the mutual solubility of water + n-octanol at the body temperature 37°C.

b. Use UNIFAC to determine the infinite dilution partition coefficient at the body temperature 37°C.

c. Will the drug stay in the bloodstream or move into fatty body parts?

Calculate and report the average overall efficiency of the electrolyzer/fuel cell system

Experiment 1: Fuel Cell System

Project Situation:

Harrington Heights Laboratories (HHL) has been hired to provide independent testing of a new fuel cell energy storage and generation system. The manufacturer claims the system has an overall efficiency of 52%, which would be a revolutionary jump beyond current technology. You have been asked to find the true efficiency of the system.

I. Introduction

PEM fuel cells use a proton exchange membrane (PEM) to convert the chemical energy contained in H2 and O2 gases into water and electricity (or vice versa). H2 on the anode side of the membrane is split catalytically:

H2 2H+ + 2e-

The protons (H+) pass through the membrane to the cathode side, where it reacts with oxygen:

½ O2 + 2H+….

Describe a chemical-related safety or environmental hazard that is related to your design project.

Write no more than one -page single space of text. I will attach a document shows what is our design project about

The title of the design project is ( Preliminary Production Pathway of Silicon Precursor, TCS, for Solar PV Manufacturing ) check the file so you can understand the topic

Describe a chemical-related safety or environmental hazard that is related to your design project. Suggested content: o Background of the process and plant o Chemical involved o What caused the disaster? o What impact did the disaster had on the local population, society, environment, and chemical industry? o How a better design could have prevented such a catastrophe, etc.? o Example: If you reactor involves catalyst, you could summarize a CSB report on an incident involving reactors using solid catalysts. Alternatively,….

Parameters for equations 1, 2 and 3 obtained from the experiment.

Running Head: AZEOTROPIC EQUILIBRIUM

AZEOTROPIC EQUILIBRIUM 2

Predicting Azeotropic Batch Distillation Equilibrium conditions

Jassim Alajmi

November 12, 2019

Jassim Alajmi, Ashraf Al Shekaili, and David Luong

ChE 450

Group Number 5

Dr. Larry Jang

California State University-Long Beach

Department of Chemical Engineering

Table of contents:

1. Abstract

1. Introduction

1. Materials and methods

1. Results

1. Dissections

1. Conclusion

1. References

Abstract

Vapor liquid equilibrium is very important now a days where most separation plants uses it. It helps to separate gas from liquid or liquid from gas to use it for some other purpose. In this experiment the goal was to Predict VLE of non-ideal mixture of water and 2-propanol at atmospheric pressure. Additionally,….

For steady flow through a heat exchanger at approximately atmospheric pressure, what is the final temperature

Lecture # 18 Handout by J.W. Van Zee 19‐Sep‐17

Problem 4.2. Statement: FIND: For steady flow through a heat exchanger at approximately atmospheric pressure, what tis the final temperature

for the flowing: a. When 800 kJ of heat is added to 10 moles of ethylene initially at 200C Ethylene = C2H4 b. When 2,500 kJ is added to 15 moles of 1 butene initially at 260C. 1‐butene = c. When 10^6 Btu is added to 40 lb mole of ethylene initially at 500 F. Ethylene = C2H4

Known: Q, kJ= varies by part Properties: schematic: T_0, C varies by part Heat capacity coeffficents:

T_0, K varies by part Ethylene 1‐Butene T,K = varies by part T=? n, moles= varies by part A 1.424 1.967

B 1.44E‐02 3.16E‐02 Assumptoins: none C ‐4.39E‐06 ‐9.87E‐06

D 0 0 Q varies by part Analysis:

Use equation 4.7 or equaiton 4.8. Here we use equation 4.7 to intergrate the Cp/R from T0 = 200C to T . This results from an energy balance on the heat exchanger for a flow system Part c. 500 F= 533.13 K which yields 0=Q + ΔH and ΔH = H_in ‐ H _out and where becuae of the integral: dH = ‐Cp*dT. Part c. 1 btu = 1055 J

Part c. 1 lb mole = 453.6 g moles Part a. n, mole = 10 Part b. n, mole = 15 Part c. n, mole = 18,144

Q, kJ = 800 Q, kJ = 2,500 Q, kJ = 1,055,040 T_in,K 473.15 solving for T_out,K T_in,K 533.15 solving for T_out,K T_in,K 533.13 solving for T_out,K T_out,K 1374.4476 T_out,K 1413.8 T_out,K 1202.746053 R, J/mol‐K = 8.3143 R, J/mol‐K = 8.3143 R, J/mol‐K 8.3143 τ = T_out/T_in = 2.90488767 τ = T_out/T_in 2.6517 τ = T_out/T 2.256008953 τ ‐ 1= 1.90488767 τ ‐ 1= 1.6517 τ ‐ 1= 1.256008953 τ ^2‐ 1= 7.43837237 τ ^2‐ 1= 6.0316 τ ^2‐ 1= 4.089576397 τ^3 ‐ 1 = 23.5125238 τ^3 ‐ 1 = 17.6457 τ^3 ‐ 1 = 10.48212992 (τ‐1)/(T_in*τ) 0.00138593 (τ‐1)/(T_in*τ) 0.0012….

What are some of the issues that resulted in high temperature hydrogen attack on the heat exchangers?

Review the case study linked below about an incident that involved fatal fires from chemicals within the Tesoro facility. This link with take you to a web page that has a number of resources regarding this incident, including a very interesting video and final report. U.S. Chemical Safety and Investigative Board. (2014). Tesoro Refinery fatal explosion and fire. Retrieved from http://www.csb.gov/assets/1/7/Tesoro_Anacortes_2014-May-01.pdf

In your own words, describe the chemical processes and why operators thought the process was controlled.

Describe high temperature hydrogen attack (HTHA). What are some of the issues that resulted in high temperature hydrogen attack on the heat exchangers?

What could have been done to prevent the incident, and to decrease the number of fatalities?

How might this knowledge be useful for individuals involved in emergency response….

Describe high temperature hydrogen attack (HTHA).

Review the case study linked below about an incident that involved fatal fires from chemicals within the Tesoro facility. This link with take you to a web page that has a number of resources regarding this incident, including a very interesting video and final report. U.S. Chemical Safety and Investigative Board. (2014). Tesoro Refinery fatal explosion and fire. Retrieved from http://www.csb.gov/assets/1/7/Tesoro_Anacortes_2014-May-01.pdf

In your own words, describe the chemical processes and why operators thought the process was controlled.

Describe high temperature hydrogen attack (HTHA). What are some of the issues that resulted in high temperature hydrogen attack on the heat exchangers?

What could have been done to prevent the incident, and to decrease the number of fatalities?

How might this knowledge be useful for individuals involved in emergency response….

analyze the contribution of all three resistances.