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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

What is the formula of density of air at particular Temp?

from the equation of state

pressure = density * gas constant * temperature

Pressure and enthalpy graph of freon22?

See links below. See also Perry And Green's Chemical Engineering Handbook Page Chapter 2, page 2-273.

How many btu's in a pound of wood chips?

This will depend on the type of wood. but generally it ranges from 6,000 to 8,000 btu's. The harder the wood or more dense it is, is also a general rule to how much heat it wold have.

Is potassium a conductor?

Yes, all metals are electrical conductors in all states of matter.

The lower transmittance of film indicates higher absorption or reflectance?

The lower transmittance of film would indicate a higher Optical Density (OD), or absorption, because as concentration increases, % transmittance will decrease. This is because of Beer's Law (A = 2.00 -[log (%T)]). As you can see from the equation, transmittance is directly proportional to the outcome of absorption. High %T = Lower Absorption.
Low %T = Higher Absorption.

What is reduced pressure steam?

Steam that was reduced in pressure from that at which it was generated in the boiler. Reducing the steam pressure can be accomplished by running it through a turbine or engine, a reducing valve or a regulator. Reduced pressure steam is often used for auxiliary equipment or heating systems after the primary process has been supplied steam at the generated pressure.

What is the usage of N-CBZ-L-proline?

Chiral pyrrolidine derivatives, containing 5-membered azaheterocycle enantiomeric intermediates are valuable in asymmetric synthesis for pharmacology.

N-Carbobenzoxy-L-proline can be used for the synthesis of biochemical reagents, the synthesis of valacyclovir side chains, the synthesis of vasopressin and other polypeptide.

N-Cbz-4,5-dehydro-l-prolineamide or N-Boc-4,5-dehydro-l-prolineamide are alternative key intermediates for the synthesis of saxagliptin, a dipeptidyl peptidase IV (DPP4) inhibitor recently approved for treatment of type 2 diabetes mellitus.

How do you calulate the feed plate of a distillation column?

For a binary set of components you calculate the feed tray using the McCabe Thiele method. For more complex systems you would need to use a process simulator and perform a sensitivity analysis to determine the optimum feed tray.

What is difference between fan and exhaust?

Fan is the thing that makes air to the cooling metal things, the ones that carrys the water.

Exhaust is the thing it puts out all the noise.

What is the top part of a gas cylinder called?

Depending on who is asking and the type of cylinder, w/ or w/out PRV and location of the PRV, acceptable answers:

Neck, Primary Manifold Access, Inlet/Outlet, Breach Point, Secondary Valve Access.

Charging Access Point

Why is it important to know the moisture content in air entering the boiler?

Since water does not burn, any moisture in the combustion air will simply be heated by the fire. Since water has a large heat capacity, this results in wasted energy. The drier the combustion air the more efficiently the burner will burn.

Where you can find the viscosity temperature chart for fuel oil no6?

Please see the link in the related links section.

Please note that actual viscosity of No. 6 fuel oil depends on the actual blend of products and the product specifications of the fuel oil. Fuel oils are usually classified by viscosity and sulfur. In particular more stringent sulfur specifications require more light products (light cycle oil (LCO) or unconverted oil (UCO)) to be blended into No. 6 fuel oil. This results in a less viscous fuel oil. There is no universal standard specification for No. 6 fuel oil.

Has the percentage of energy imported to the United States increased or decreased over the last fifty years?

Increased. In 1950, 8.4% of the total volume of crude oil consumption in the United States was imported. Imports as a percentage of the total consumption peaked at 66.6% in 2006, and have declined since to 56.9% in 2012. Note that in my calculations using the U.S. Energy Information Administration raw data, Consumption = Production - Exports + Net Imports. See also the related link for the EIA generated graph. Imports of coal, natural gas, and other forms of energy into the U.S. are considered negligable during this time period.

What is molecular weight of SAE 40 oil?

Manufacturers mix various oils to make an 'SAE 40' oil product. Such a mixture will not have a molecular weight.

What is degumming?

it is the method used in textile industry ,it is done by removing sericin,a glue like substance fro silk by using soap to improve the quality of silk

What is the definition of piping class?

Pipe class is a collection of most compatible components considering dimensional and material properties for the intended service over a range on pressure and temperature specified.

When was the semiconductor built?

Semiconductors aren't built, they are chemicals. Maybe you are thinking of semiconductor electronic components.

The first semiconductor discovered was galena (lead sulfide) which was first used in a practical electronic component in 1874. The next semiconductor discovered was copper oxide which was first used in a practical electronic component in 1924. After that many others were discovered including selenium, germanium, and silicon.

It was not practical to build electronic components using silicon until 1958 when Fairchild perfected their silicon mesa process, then in 1959 their silicon planar process.

Which acid is used for heat exchanger tube cleaning?

Depend upon material of construction...

If SS u can use HCl but immedeatly wash it by NaOH and clean cold water.