Describe how T₁ and T₂ can be used in determining the structural features of polymers.  

Several organizations publish occupational exposure limits (OELs) including the Occupational Safety and Health Administration's (OSHA) permissible exposure limits (PELs), the American Conference of Governmental Industrial Hygienists' (ACGIH) threshold limit values (TLVs), and the National Institute for Occupational Safety and Health's (NIOSH) recommended exposure limits (RELs). Only OSHA's PELs are legally enforceable. Discuss why you would only use the OSHA PEL at a facility where you were the safety officer, or alternatively, why you would choose to use one of the other OELs or a combination of the OELs.

How to apply HAZOP in a dishwasher?

What does "Salt boundary and Void volume" represent in Size Exclusion Chromatography?

Give the raw materials,process description,advantages,disadvantages,flow sheet for production of PENICILLIN.

Give the raw materials,process description,advantages,disadvantages ,flow sheet for the production of CITRIC ACID

Give the raw materials, process description,advantages,disadvantages ,flow sheet for the production of OXALIC ACID

In the transmission of infectious diseases, aerosolised droplets (from coughing and sneezing) are an important potential mode of transmission.

The size of droplets is critical, as the size dictates the rate at which droplets settle to surfaces under the action of gravity. You have been tasked with determining the settling rate (terminal velocity) of aerosolized droplets. The droplets may be assumed to be spherical, and have the properties of water (ρ=1000 kg/m3, μ=0.001 Pas). The droplets can be assumed to be settling in a quiescent atmosphere at standard temperature and pressure.

Determine the length of time droplets of the following sizes (at their terminal velocity) take to fall a distance of 1.0 m:

• 1μm

• 200μm

1. Explain how we learn about past climates?

2. Explain how volcanic eruptions or asteroid impacts affect climate?

3. Describe how changes in the Earth-Sun system create changing amounts of insolation?

Water at 34 ^oC is reacted with 2.34 tonne h^-1 of gaseous thionyl chloride, SO₂Cl₂, at 43 ^oC and the product stream leaves as liquid. The reaction is given by:

SO₂Cl₂ (g) + 2H₂O (aq) → H₂SO₄ (aq)           + 2HCl (aq)

1. Complete the mass balance if three times the stoichiometric quantity of water is used.
2. Calculate the amount of heat released in kW.
3. If 65% of the heat released is removed by a cooling coil, calculate the temperature of the product stream. Use a temperature datum of 15^oC.

DATA

Heat of reaction, ΔH_R,            = - 2.5 × 10⁵ kJ kmol^-1 Liquid specific heat = 4.2 kJ kg^-1K^-1

Gas specific heat                     = 1.0 kJ kg^-1K^-1 Relative atomic masses

MW Data

C = 12,     H = 1,       O = 16,        S = 32,     N= 14, Cl=35.5

Calculate the density of the following fluid mixtures. Report your answers in units of lbm/ft3 and kg/m3. You will need to use equation 1.A from the textbook, and you will need to clearly state a basis for your calculations. Consider using either an appropriate mass basis or a volume basis, whichever fits each sub-problem statement the best.

A solution of ethanol and water, containing 30% ethanol and 70% water (by volume). The density of water is 62.3 lbm/ft3, while the density of ethanol is 49.2 lbm/ft3.

A drilling mud that contains 32 weight (wt) % barite (BaSO4) and 68 wt% water. The specific gravity of barite is 4.7 (density of barite is 4.7 times greater than the density of water).

A gas volume that is 80% air (density of 1.23 kg/m3) and 20% carbon dioxide (density of 1.98 kg/m3), combined in a closed container at final pressure of 1 atmosphere and ambient temperature.

A plant to make 30 000 t y^-1 of glycerine and comprising 11 process steps was built in the UK five years ago, with a total investment cost of GBP 48 million. A new plant for the production of 50 000 t y^-1 of glycerine is now to be built near Ankara, Turkey. Because of more stringent international legislation, new glycerine plants require additional pollution control equivalent to 3 further process steps. Estimate the total investment cost in TRY (Turkish Lira) of such a plant using the data below.

Scale factor = 0.6