5 replies to this topic

[ManiMS]

What is the typical column efficiency having very small diameter (less than 1 ft)?
Any related articled to substantiate...please provide your support.

Hallo!

Check out : Design of Equilibrium Stage Processes - Buford D. Smith - McGRAW-HILL. There u can find more than u need actually.

or try Handbook of Separation Techniques for chemical engineers- Schweitzer.

best regards

[Padmakar Katre]

Dear,

The significance of diameter in any column internals mass transfer efficiencies is an outcome of the column loadings (Vap - Liq).

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[Zauberberg]

There is no such thing as "typical column efficiency", even for towers designed as identical - if we account for installation and operation factors.

By considering process design only, there should be no issues regarding column efficiency vs. column diameter - if appropriate design has been chosen in the first place.

For such a small tower, I would certainly consider packed column rather than a trayed one. There is no sufficient length in a trayed tower for the flow path to be fully developed, and the contacting efficiency will be adversely affected.

[chrisadam008]

No generally-accepted definition of “design” exists^[1], and the term has different connotations in different fields (see design disciplines below). Informally, “a design” (noun) refers to a plan for the construction of an object (as inarchitectural blueprints, circuit diagrams and sewing patterns) and “to design” (verb) refers to making this plan^[2]. However, one can also design by directly constructing an object (as in pottery, cowboy coding and graphic design).

More formally, design has been defined as follows.

(noun) a specification of an object, manifested by an agent, intended to accomplish goals, in a particular environment, using a set of primitive components, satisfying a set of requirements, subject to constraints;(verb, transitive) to create a design, in an environment (where the designer operates)^[3]Here, a "specification" can be manifested as either a plan or a finished product and "primitives" are the elements from which the design object is composed.

With such a broad denotation, there is no universal language or unifying institution for designers of all disciplines. This allows for many differing philosophies and approaches toward the subject (see Philosophies and studies of design, below).

The person designing is called a designer, which is also a term used for people who work professionally in one of the various design areas, usually also specifying which area is being dealt with (such as a fashion designer, concept designer or web designer). A designer’s sequence of activities is called a design process^[4]. The scientific study of design is called design science ^[5].

Designing often necessitates considering the aesthetic, functional, economic and sociopolitical dimensions of both the design object and design process. It may involve considerable research, thought, modeling, interactive adjustment, and re-design. Meanwhile, diverse kinds of objects may be designed, including clothing, graphical user interfaces,skyscrapers, corporate identities, business processes and even methods of designing^[6].







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[fra.telli]

What is the typical column efficiency having very small diameter (less than 1 ft)?

From an industrial point of view, "very small diameter" is less than 3ft.
Or at least, note that under that measure, all sort of internals are cartridge mounted (that means higher costs due to difficulties of assembly).
Just think at problems related to:
- circunferential gas bypass if you use structurated packing
- random packing voidance/disunifirmity
- number of valves in such a small plate (and what about dimensioning and construction of the downcomers?)
- dimensioning and constructing the liquid distributor
- managing the fluidodynamic of gas/liquid (sometimes it's difficult to controll the flow in a 12" pipe, consider to add internals and a two phase fluid!)

in the end, very small diameters are used in laboratories,