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TitleManufacture of Sodium Dichromate
TagsCorrosion Dye Chemical Reactor Chromium
File Size19.2 MB
Total Pages84
Document Text Contents
Page 1

PROJECT REPORT
on

MANUFACTURE OF
SODIUM DICHROMATE

submitted in partial fulfillment of the requirements
for the award of the degree of

BACHELOR OF TECHNOLOGY

(CHEMICAL ENGINEERING)

of

UNIVERSITY OF MADRAS

by

R. JANAKIRAMAN (9002122)
L.M. SHIVA SHANKAR (9002129)
S. NARESH KUMAR (9090365)

under the guidance of

Dr. R. KARTHIKEYAN, Ph.D.,
(Professor, Department of Chemical Engineering)

APRIL 2004

DEPARTMENT OF CHEMICAL ENGINEERING

S.R.M. ENGINEERING COLLEGE
S.R.M. Nagar, Kattankulathur, Kancheepuram District - 603 203.

- - -

Page 2

BONAFIDE CERTIFICATE

MANUFACTUREOF SODIUM DICHROMATEt&a ~ ~

~ .~'A~~li__lSll~~~ ~~_L~_ _

Bachelor of Technology

.
In

Submitted for university examination held in April 2004 at

S.R.M. Engineering College, Kattankulathur.

Internal Examiner

-- - ---

Page 42

Providing 10% reserve area

Area of evaporator= 1.1 x total area

= 1.1 x 0.5275

= 0.5802 m2

Diameter of Body = 0.8595 m

Height of evaporator = 3 x L

=3xl

=3m

Design summary:

Diameter of evaporator = 0.8595 m

Height of evaporator =3 m

Crystallizer:

Q = U.A.LlTIn

Where,

Q = Amount of heat transfer in Kcallhr

U = Overall Heat transfer co-efficient in Kcal/m2 hr °C

A = Area of heating surface m2

LlTIn= Logarithmic Mean temperature in °C

Cooling water required for crystallization enters at 20°C and leaves at 40°C.

U = 1300 Kcal/hr m2 °C

LlTln= [(80- 40) - (30 - 20)]/ In «80 - 40)/ (30 - 20))

= 21.6 °C

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Page 43

Area = Q/ (U.~T1n)

= 272137.46/ (1300 x 21.6)

= 9.6915 m2

The radius of crystallizer employed is 0.5 m

A = x.r.L

L = 9.6915/ (0.5 x x)

=6.2m

Design Summary:

Radius of crystallizer =0.5 m

Length of crystallizer = 6.2 m

Dryer:

Weight of bone dry solid (ms)= 486.3516x 0.95

= 462.034 KgIhr

Initial Moisture content (Xa) = 5/ (100- 5)

= 0.0526

Final Moisture content (Xb) = 0.2/ (100 - 0.2)

= 0.002

Given that,

Tha= 135°c

Tsa=30 °c

T w = 40 °c

; Thb= 80 °c

; TSb= 65 °c

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Page 83

--. -- --. --- ---- .----

CONCLUSION

This project gives a clear view of the manufacturing process of sodium

dichromate from chromite ore. The chapters dealt with, provides a clear

idea about the designing of the equipments, manufacturing costs of the

plants, layout of the plant and safety measures to be taken while

operating the plant. The cost .estimation shows that this project is

considerably an economical one since the rate of return and pay back

period are found to be in allowable range. Hence, this project should be

feasible in a pilot scale and also be expanded to large scale

..

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Page 84

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BIBLIOGRAPHY

1. Chemical Engineers Handbook by Perry

2. Chemical Engineering, Volume: 6 by Coulson & Richardson

3. Unit Operation of Chemical Engineering by Warren L.Mc Cabe Julian

C.Smith

4. Process Equipment Design by M.V.Joshi

5. Process Economics and Design by Peter & Timmerhauss

6. Encyclopedia of Chemical Engineering by Kirk & Othmer

7. Encyclopedia of Chemical Engineering by Mcketta

8. Ullman's Encyclopedia

9. Conceptual Design of Chemical Process by Douglas

10.Preliminary Chemical Engineering Plant Design by Nostrard & Reinhold

11.Preliminary Chemical Engineering Design by Baasel

12.ChemicalEngineeringGournal)May2001,August2002

WEBSITES VISITED

1. www.lordschemical.com

2. www.dialindia.com

3. www.analytyka.com.mx

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