ABSTRACT
This is an abstract on the
construction of a packed distillation column. A packed distillation column is
used in the separating process distillation that is the separation of two
miscible liquids.
It was constructed by marking out the
dimension of the column, condenser, pot, using steel rule scriber, oxyacetylene
flame was used for cutting after which the work piece were center punched and
drilled using the drilling machine. At last they were folded, shaped, welded
tested, finished and painted.
This construction was done with the
following specifications, 650, 220, 188 for height, external and internal
diameter of column respectively.
For condenser, 650, 120, 114 for
height, external and internal diameter respectively. For boiler pot, 450, 240,
236 for height, external and internal diameter respectively all in mm
dimension.
It was generally required that
stainless steel be used totally for the construction as the standardized
Material but due to tits cost, galvanized metal was used. Using the constructed
packed distillation column, a fermented palm wine can be distilled to collect
gin as the distillate. In comparing the standardized distillation column with
the Oni constructed it was rated 80% due to cost of materials (galvanized of
construction used. But the standard material of construction that was supposed
to be used is stainless steel.
At the end of the construction the
cost was (N9, 000). Nine thousand Naira from the direct labour condenser etc.
the cost is as a result of economy situation in Nigeria.
TABLE OF CONTENT
Title page
Letter of
Transmittal
Dedication
Acknowledgement
Abstract
Table of
content
CHAPTER ONE
1.0 Introduction
1.1
Historical development
1.2
Definition
CHAPTER TWO
2.0 Literature review
2.1
Theory of distillation
2.2
Types of distillation
2.2.1
Binary distillation
2.2.2
Multi-component distillation
2.2.3
Differential distillation
2.2.4
Rectification distillation
2.2.5
Flash distillation
2.3.0
Distillation column
2.3.1 Types of distillation column
2.4.0 Packing
2.4.1
Random packing
2.4.2
Regular packing
2.4.3
Tower shell
2.4.4
Packing support
2.4.5
Packing restrainer
2.4.6
Entrainment eliminators
2.5.0 Countercurrent flow of liquid and gas through
packing
2.5.1
Flooding and loading
2.5.2
Pressure drop for two phase flow
2.5.3
Mass transfer coefficient for packed tower
2.5.4
Liquid hold up
2.6.0
Material of construction
2.7.0
Properties of material construction
2.7.1
Physical property of material construction
2.7.2
Chemical property of material construction
2.7.3
Mechanical property of material construction
2.8 Factors to be considered when selecting a
material of construction
2.8.1
Definition of terms in the factors
CHAPTER THREE
3.0 Methodology/Fabrication Procedure
3.1
The column
3.2
The condenser
3.3
The packing
3.4
The boiler pot
3.5
Steam travel pipe
3.6
The stand
CHAPTER FOUR
4.0 Discussion
CHAPTER
FIVE
5.0 Conclusion
5.1
Recommendation
References
Appendix I
Appendix II
CHAPTER ONE
INTRODUCTION
The aim of this project is to
construct a packed distillation column. The separation of liquid mixtures into
their several components is one of the major operations in the chemical and
petroleum industries, and distillation, the most widely used method of
achieving this end, is the key operation of the oil refinery. Throughout the
chemical industry the demand for puner products, coupled with a relentless
pursuit of greater efficiency, has necessitated continued research into the
techniques of distillation. The operation is restricted to situations when
components distribute themselves between liquid and vapour phases. The vapour
phase is generated by the addition of heat and separation is enhanced by the
differences in the vapour pressure of the components, hence their boiling
points.
Packed
columns are generally used for distillation, gas-absorption and liquid-liquid
extraction. They ensure continuous contact of liquid and gas in both
counter-current and concurrent flows and are essentially, vertical columns
which have been filled with packings or devices of larger surface. The liquid
is distributed over and trickles down through the packed-bed, exposing a large
surface to contact the gas, while the gas or vapor moves upwards
counter-currently. In some gas-absorption columns, concurrent flow is used.
The packings for the tower should
offer the following characteristics: -
1.
Provide for larger interfacial surface between liquid
and gas.
2.
Posses desirable fluid characteristics.
3.
Be chemically inert to fluids being processed.
4.
Have structural strength to permit easy handling and
installation.
5.
Represent low cost
6.
Should be light in weight.
There are
two major types of packings arrangements:
a.
Random and
b.
Regular packings.
The performance of a packed column is
dependent on the maintenance of a good liquid and gas distribution throughout
the packed-bed and this is an important consideration in packed column design.
A packed distillation column is
similar to a plate column with the plates replaced. Be packed sections but in
process industries they are considered more economically than plate columns for
the following reasons: -
a.
For columns less than 0.6m (2.0 ft) diameter, packings
are usually cheaper than plates unless alloy-metal packings are required.
b.
Acids and many other corrosive materials can be
handled in packed columns because construction can be of ceramic, carbon, or
other resistant materials.
c.
Packings often exhibit desirable efficiency drop
characteristics for critical vacuum distillations.
d.
Liquids ending to form may be handled more readily in
packed columns because of the relatively low degree of liquid agitation by the
gas.
e.
Holdup of liquid can be quite low in packed columns,
an advantage when the liquid is thermally sensitive.
Conditions
unfavourable to packed columns are:
a.
If solids are present in the liquid or gas plate columns
can be designed to permit easier cleaning.
b.
Some packing materials are subject to easy breakage
during insertion into the column or resulting from thermal expansion and
contraction.
c.
High liquid rates can often be handled more
economically in plate columns than packed columns.
d.
Cooling coils can be incorporated more readily into
plate devices.
e.
Low liquid rates lead in complete welting of column
packings, thus decreasing contacting efficiency.
f.
Packed columns exhibit narrower operating ranges than
cross-flow plate columns.
However, the packed tower is a
cylindrically vertical column operating with top and bottom flow allowances.
Provisions are made for packing support, packing restrainers, packing
entrainment eliminators liquid distributor etc. the cost and choice of
materials of construction are also important considerations in this project as
they go along way to influence the safety and efficiency of the equipment and
also dictate its service-life for distillation in packed towers,
It is normally a practice to increase
the calculated height of packing by 40 per cent to allow for liquid
maldistribution and wetting problems.
Get the Complete Project Material Now!!!
