Chemical Engineering Answers

1. Under what situation shall engineers use jacking at one end only and from both ends in prestressing work?

If 8.5 moles of propylene(gas) reacts completely with hydrogen to form propane(liq). Determine the total heat of reaction(KJ) at 25 oC and 1 atm.

Methane reacts completely with oxygen to produce carbon dioxide(gas) and water(liq). What is the extent of reaction if 105 moles of water(liq) are produced?

Just write the final answer correct to 2 decimal places. Show all workings.

a) We are planning to operate a mixed flow reactor to convert A into R. This is a liquid phase reaction, with the stoichiometryA→R. The rate of reaction is given below. What size of mixed flow reactor is needed to achieve 75% conversion of a feed stream of 1000 moles of A per hour?

CA,mol/l. 0.1 0.2 0.3 04 0.5 0.6 0.7 0.8 1 1.3 2. -rA,mol/(l.min). 0.1 0.3 0.5 0.6 0.5 0.25 0.1 0.06 0.05 0.045 0.042

Solve this problem with step by step process?

At present the conversion is 66.7% for the elementary second order reaction 2A→2R when operating in an isothermal plug flow reactor with a recycle ratio of unity. Determine the conversion if recycle is shut off.

Solve this problem with step by step process?

An evaporator is used to concentrate 12 000 kg/h of a 15% solution of NaOH entering at 60oC to a product of 50% solid. The pressure of the saturated steam used is 300 kPa and the pressure in the vapour space of the evaporator is 11.7 kPa. The overall heat transfer coefficient is 1 560 W/m2K. Calculate the steam used and the steam economy in kg vaporised/kg steam.