Download GTU BE/B.Tech 2019 Summer 7th Sem New 2170507 Computer Aided Process Synthesis Question Paper

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Subject Code: 2170507

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-VII(NEW) EXAMINATION — SUMMER 2019

Subject Name: Computer Aided Process Synthesis

Time: 02:30 PM TO 05:00 PM

Total Marks: 70

Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q1

1. What is pinch point? Explain its importance to design heat exchanger network using pinch design approach. (MARKS 03)

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2. Explain role of GCC in design of HEN. (MARKS 04)
3. Explain the concept of threshold approach temperature and optimum approach temperature. (MARKS 07)

Q2

1. Discuss heuristics for selection of separation methods. (MARKS 03)
2. With suitable example explain the concept of breaking heat loops to reduce number of heat exchangers in HEN. (MARKS 04)

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3. Explain positioning of heat engines and heat pumps relative to pinch. (MARKS 07)

OR

Q3

1. Design HEN, with minimum numbers of heat exchangers that satisfy AT_min =10 °C and hot utility MER targets of 300 kW, for three streams on hot side of the pinch. (MARKS 07)



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Stream	Tin (°C)	Tout (°C)	FCp (kW/ °C)
C1	90	190	10
H1	200	100	5
H2	150	100	4




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2. Discuss vapour recompression with respect to heat integrated distillation column. (MARKS 03)

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3. Briefly describe design approaches toward safe chemical plants. (MARKS 04)

Q3

1. A mixture of four alcohols labeled as A, B, C, and D with flows in the feed of 1.05, 0.5, 1.2 and 7 mol/s respectively, for a total 9.75 mol/s and relative volatiles are 3.4, 2.5, 2 and 1 respectively. The information about marginal vapor flows estimated for non-key species are as under, Find the best distillation based separation sequence. Calculate number of possible sequence to separate four components and Draw direct and indirect sequences for same. (MARKS 07)




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	A	B	C	D
A/B	--	--	2.53	3.59
B/C	3.11	--	-	5.6
C/D	1.88	1.25	-	-

OR

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1. Explain separation sequencing for Solid-Fluid systems. (MARKS 03)
2. Discuss the ethics of chemical engineer. (MARKS 04)

Q.4

1. Discuss the residue curve map. (MARKS 03)
2. Differentiate Flow shop plant and Job shop plant. (MARKS 04)

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3. Explain the step wise procedure for construction of attainable region. (MARKS 07)

OR

1. List the environmental factors to be considered in process design. (MARKS 03)
2. Explain the concept of reboiler flashing and vapor recompression in distillation configuration. (MARKS 04)
3. List out various methods to calculate MER targets. Explain any one in detail with suitable example. (MARKS 07)

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Q.5

1. Define with example : Cycle time, Make span, Flow shop plant. (MARKS 03)
2. Explain transshipment model for stream matching. (MARKS 04)
3. Explain algorithm for establishing distillation column pressure and condenser type. (MARKS 07)

OR

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1. Discuss role of computers in Process Design. (MARKS 03)
2. Discuss on types of plants in multiple product batch plants. (MARKS 04)
3. Discuss reactor designs used for handling large adiabatic changes in temperature. (MARKS 07)

(¢) Use the marginal vapor rate (MV) method to determine a sequence for the separation of alcohol mixture. Give rank to various sequences. Calculate no, of possible sequence for five components. (MARKS 07)

Date: 18/05/2019

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