7/23/2019 CHEN3000 Process Plant Engineering Test 1 Sem 2 2014 Sample

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CURTIN UNIVERSITY

DEPARTMENT OF CHEMICAL

ENGINEERING

Process Plant Engineering 322

Test 1

Date: 28th

August, 2014

Duration: 1 hr 30 min

Total marks: 100

Answer all questions

Student ID:_______________________________________

Full name:________________________________________

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Question 1 (20 marks)

a) Fill in the blanks for the following letters or symbols? (10 marks)

i.

ii. ___________________________

iii.

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iv. _______________________________

v.

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vi.

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b) Explain the code descriptions given in the following Table? (3 marks)

A______________________________________________________________________

C______________________________________________________________________

X______________________________________________________________________

c) Explain dezincification of brass (3 marks)

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d) Explain briefly the plan for studying the materials of construction for any process.

(4 marks)

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Question 2 (26 marks)

Based on the description given below for the semi-regenerative reforming (SRR) process, prepare a

block diagram covering all the units and conditions (wherever possible).

SRR units consist of three adiabatic fixed-bed reactors in series with intermediate heating. Early SRR

units (~1950) were operated at relatively high pressure (25-35 bar) in order to maximize the run time.

The development of improved catalysts that had a lower tendency for coke formation enabled

operation at lower pressure (15-20 bar), while maintaining the same catalyst life (typically 1 year).

The naphtha feed is preheated and sent to the first reactor. In this reactor the kinetically fastest

reactions occur. These are dehydrogenation reactions of napthenes to aromatics. To maintain high

reaction rates, the product gases are reheated before sending being sent to a second heater, etc. The

indicative temperatures in the reactors (from 1 to 3) are 720, 760 and 780 K respectively. The effluent

from the last reactor is cooled by heat exchange with the feed. Then hydrogen is separated from the

liquid product and partly recycled to the process. The net hydrogen production is used in other parts of

the refinery, for instance in the naphtha hydrotreater. The liquid product is fed to a stabilizer in which

the light hydrocarbons are separated from high-octane liquid reformate.

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Question 3 (24 marks)

As a design engineer what is your brief rationale for selecting the materials for several of the following

cases? What is your final pick based on the design and material information provided in tabulated

forms? You may also use the following information provided in the materials selection chart.

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Case 1: Large pottery kiln

Materials available for your pick:

1. Brick

2.

Concrete

3. Woods

4.

Solid elastomers and solid polymers5. Polymer foam like ceramics

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Case 2: A heat exchanger

Materials available for your pick:

1. Brasses

2. Phosphor bronzes

3. Aluminium-bronzes

4.

Nickel-iron-aluminium-bronzes

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Case 3: Passive solar heating

Materials available for your pick including costs shown in bracket:

1. Brick ($1400/m3)

2. Stone ($1400/m3)

3. Concrete ($200/m3)

4. Glass ($10,000/m3)

5. Titanium ($200000/m3)

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Case 4: Short-term Isothermal containers

The design specification for the egg-shaped package containing the electronics (see above Figure)

requires that, when the temperature of the outer surface is changed by 30C, the temperature of theinner surface should not change significantly for an hour. To keep the device small, the wall thickness is

limited to a thickness w of 20 mm. What is the best material for the package?

Materials available for your pick:

1. Elastomers (Butyl rubber, neoprene and isoprene are examples)

2. Commodity polymers: polyethylenes and polypropylenes

3. Polymer foams

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