Transcript Process Design Hydro-dealkylation process Level 3

ChEn 4501 Process Design
HDA process
Alternative Design Economics Report
Section 5 – Group 7 – Yellow
Customer Name(Economist)
Customer Name(Engineer)
Customer Name(Coordinator)
Teacher Name
Our Alternative Design PFD
What’s New?
We installed a heat exchanger
using the reactor inlet and outlet as
the cold and hot streams.
This added millions to our yearly
cash flows.
For our alternative design, the
purge stream was treated in a high
pressure flash tank with the goal of
benzene recovery.
A few auxiliary process units were
required to bring the purge stream
to the temperature and pressure
required for an acceptable
separation.
New Material Flows
Stream
Flow (lb/hr)
Cost ($/100 lb)
Materials Cost ($/yr)
Fuel Values ($/yr)
All costs and revenues
($/yr)
Feed Toluene
26,260
-27.27
-58,370,000
#
-58,370,000
Feed Gas
1,291
-50.33
-5,030,000
#
-5,030,000
Benzene
Product
20,870
40.86
69,500,000
#
69,500,000
Purge Gas
5,229
#
#
9,586,000
9,586,000
Purge
Diphenyl
1,105
#
#
941,100
941,100
Total yearly profit from materials bought, sold and purged: $16.62 M/yr
New Energy Flows
Energy Streams for:
Duty (BTU/hr)
Utility
Energy Cost ($/yr)
Reactor Cooling
527,800
Cooling Water
7,349
Compressor 1
1,185,000
Electricity
169,800
Compressor 2
527,800
Electricity
75,640
Pump 1
28,830
Electricity
4,132
Pump 2
64,090
Electricity
9,185
Stabilizer Column Condenser
3,096
Cooling Water
3.906
Stabilizer Column Reboiler
4,140,000
Steam at 450 psig
184,800
Benzene Column Condenser
10,920,000
Cooling Water
13,780
Benzene Column Reboiler
8,034,000
Steam at 450 psig
358,600
Toluene Column Condenser
1,719,000
Cooling Water
2,169
Toluene Column Reboiler
1,645,000
Electricity
235,800
Turbine Generator
979,800
Electricity
-140,400
Total yearly operating costs from utilities
$920,900/yr