Answered: A phosphoric acid solution and an…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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PLEASE HELP!! A phosphoric acid solution and an ammonia solution are provided through flow control valves to an agitated reactor. Ammonia and phosphoric acid react to form diammonium phosphate (DAP), a non-hazardous product. The DAP flows from the reactor to an open-top storage tank. Relief valves are provided on the storage tanks and the reactor with discharges to outside of the enclosed work area.

If too much phosphoric acid is fed to the reactor (compared to the ammonia feed rate), an off-specification product is created, but the reaction is safe. If the ammonia and phosphoric acid flow rates both increase, the rate of energy release may accelerate, and the reactor, as designed, may be unable to handle the resulting increase in temperature and pressure. If too much ammonia is fed to the reactor (as compared to the normal phosphoric acid feed rate), unreacted ammonia may carry over to the DAP storage tank. Any residual ammonia in the DAP tank will be released into the enclosed work area, causing personnel exposure. Ammonia detectors and alarms are provided in the work area.

Give the Hazardous and Operability (HAZOP) worksheet.

Q3: A phosphoric acid solution and an ammonia solution are provided through flow control valves to
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an agitated reactor. Ammonia and phosphoric acid react to form diammonium phosphate (DAP), a
non-hazardous product. The DAP flows from the reactor to an open-top storage tank. Relief valves are
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provided on the storage tanks and the reactor with discharges to outside of the enclosed work area.
If too much phosphoric acid is fed to the reactor (compared to the ammonia feed rate), an off-
specification product is created, but the reaction is safe. If the ammonia and phosphoric acid flow rates
both increase, the rate of energy release may accelerate, and the reactor, as designed, may be unable
to handle the resulting increase in temperature and pressure. If too much ammonia is fed to the
reactor (as compared to the normal phosphoric acid feed rate), unreacted ammonia may carry over to
the DAP storage tank. Any residual ammonia in the DAP tank will be released into the enclosed work
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area, causing personnel exposure. Ammonia detectors and alarms are provided in the work area.
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Give the Hazardous and Operability (HAZOP) worksheet.
PHOSPHORIC
AMMONIA
SOLUTION
STORAGE
TANK
ACID
STORAGE
TANK
OUTDOORS
DAP
REACTOR
ENCLOSED
WORK
AREA
DAP
STORAGE
TANK
LOADING
STATIONS
LI = Level Instrument
EL = Flow Instrument
of

Table3. HAZOP Analysis table for Question 3.
Item
Parameter
Guide
word
Consequences
Deviation
Causes
Recommedations/
Actions

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