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Chemical Engineering
Chemical Engineering is the branch of engineering that deals with the technology of large-scale chemical production and the manufacture of products through chemical processes. Today, the field of chemical engineering is a diverse one, covering areas from biotechnology and nanotechnology to mineral processing.
1,464 Questions
Why does the diameter of distillation column vary at different location?
A distillation column has flows of materials going up and down the plates or packing. The flow across each plate or section of packing is an essential factor in the optimization calculations and design. Diameter is one of these considerations.
Since columns have "heavies" traveling down and "lights" moving up and the division between these components may not be even, the top and bottom flows may be quite different, and the optimal column diameter must be adjusted at different locations along the length. Add to this the introduction of a feed stream at some point in the mid-column and the flows are altered again.
But why be concerned about this? Columns are often constructed of expensive alloys, glass lined, or heat treated to avoid erosion, corrosion or stress problems. Minimizing the column size minimizes the cost. Along with quality of product, cost is an optimization factor.
What is the heat of reaction of ethylene when form polyethylene?
3350 - 4185 J/g for polymerisation of ethylene gas
taken from eng-tips.com
ref Plastics Materials 5th ed J A Brydson 1989 p198
Viscous flux usually refers to laminar flow. In most contexts, it refers to something like creeping flow or Poiseuille flow. Viscous flus usually arises from an external body force acting on a fluid. The external body force is usually pressure, or in some instances, centripetal force or magnetism.
What is Hardgrove grindability index?
The Hardgrove Grindability Index was developed in the 1930s from experimental work by R. Hardgrove to determine the relative difficulty of reducing various coals to a particle size required for efficient combustion in pulverized coal boiler furnaces. The HGI is now commonly applied to specifications for coal to be used in the iron making, cement and chemical processes.
There are several different "standard" methods for the determination of HGI (e.g. - AS1038 Part 20:2002, and ASTM D409-2006), which can lead to significantly different results. Further, HGI is an empirical measure and not a physical proprty of coal; as such the results of any standard test have relatively low repeatability for a given coal sample.
In general, the higher the HGI value, the more readily a coal can be reduced to smaller particle sizes.
Tin is a metal,it exist in solid form.
It have a low melting temperature of 232 C (449.47 F).
What is the effect of olefin concentration on naphtha hydrotreating process?
Hydrotreating reaction is an exothermic reaction. The total reaction provides excess reaction heat; more is produced by the exothermic hydrogenation reactions than are required to support the endothermic cracking reactions.High Olefin conc. leads to high temp. rise due to hydrogenation reaction.This excess heat increases the reactor temperature and accelerates the reaction rate. Temperature rise can be controlled by injecting cold hydrogen or cold recycled quench into the reactors to absorb excess reaction heat.
How hard is a diamond in Rockwell Scale c?
Diamond is more than 1000 times harder than quartz, which is in the 80 range in the Rockwell C. Diamond cannot be measured on the Rockwell C scale. A diamond pyramid is actually used in the Rockwell C test, which would be inconclusive.
Method of input data in computer?
Computers takes input through input devices like keyboard and mouse. Every actions on or by the input devices are converted into electromagnetic signals. These electrical signals are sent to Signal Processing Units, which converts the analog signal into digital one and transfers it directly to processor or to processor via memory for further processing. Like sensors inside the mouse record every movement of mouse into electrical signals and transfer it to ADC (analog to digital converter.)
- chandrabhan pradhan
What is petrochemical engineering is all about?
I came across petrochemical engineering in my study and would want to know what it is
1 ton equal 1 cubic meter lead?
no.
a cubic centimeter has a mass of 11.34 grams
there are 1,000,000 cubic centimeters in a cubic yard
therefor one cubic meter of gold = 11,340,000 grams or 11,340 kg.
a metric ton is 1000 kg
a US ton (short ton) is 2000 pounds or 907.2 kg
a UK ton (long ton) is 2240 pounds or 1,016 kg
In any of the above a cubic meter of lead would be over 11 tons.
Almost correct.
Assuming a purity of 999.9% 1 cubic metre of lead = 11.0229 short tons
9.8425 long tons
10 tonnes (metric)
therefor:-
1 short ton (US) of lead = 0.110 cubic metres or 3.884 cubic feet
1 long ton (UK) of lead = 0.0984 cubic metres or 3.474 cubic feet
1 tonne (metric) of lead = 0.100 cubic metres or 3.515 cubic feet
Kettle Type Reboilers:
Kettle reboilers are very simple and reliable. They may require pumping of the column bottoms liquid into the kettle, or there may be sufficient liquid head to deliver the liquid into the reboiler. In this reboiler type, steam flows through the tube bundle and exits as condensate. The liquid from the bottom of the tower, commonly called the bottoms, flows through the shell side. There is a retaining wall or overflow weir separating the tube bundle from the reboiler section where the residual reboiled liquid (called the bottoms product) is withdrawn, so that the tube bundle is kept covered with liquid.
Image 1: Typical steam-heated kettle reboiler for distillation towers
What is the syllabus for psu engineering exam?
i am b.tch 3rd year student of Electrical and Electronics branch from U.P.T.U.
can you tell me the syllabus of psu.
The steam required for steam tracing is calculated on the basis of the amount of heat transfer that is required or the temperature that you want to maintain with the help of steam. It also depends on the pipe material through which the steam is passing,the condition of the steam that whether it is saturated or superheated etc. Overall heat transfer cofficient is calculated considering all the factors like fouling or scaling,inside and outside dia. , surface area etc. After calculating the amount of heat to be transferred, the requirement of rate of steam is calculated. Generally, Low pressure steam is used as it has got more latent/Sensible heat as compared to MP or Superheated steam.
this can be your first fraction of distillation. In general crude means that the half fabricate isn't pure enough and more purification steps are required
What are scientists that study hydrodynamics called?
Hydrodynamics are the study of fluids in motion.
Type your answer here... Chemical engineering divided in to unit operations and unit processes. Unit operations involve those, where no chemical reaction ocurring.
eg: filteration, evaporation, distillation
In unit processes, chemical reactions involved.
eg: chemical reactions and synthesis.
What is usage of concentric and eccentric pipe reducer?
An eccentric reducer is mostly used to force air in a direction, normally towards a pump or airvalve so that it does not get trapped inside the pipework.
Ethyl Mercaptane is C2H5SH. It is a sulphur containing organic compound. It is added into LPG so as to detect any leakage of LPG. The Pungent smell that comes from LPG is tht of ethyl mercaptane,otherwise LPG is an odourless gas.
