Answer / linto k. john

Sodium Meta Bi Sulfite (SMBS) is used as a dechlorination agent.
It is widely used in the water treatment industry. The free chlorine in water causes oxidation of RO/Nano Filtration membranes and affect the performance of treatment system.
The basic chemistry behind the dechlorination process is as follows

Chlorine may be either chlorine gas or hypochlorites of sodium or calcium.
When combined with water they hydrolyse to form hypochlorous acid.
1. Cl2 + H2O = HOCl + HCl
2. NaOCl + H2O = HOCl + NaOH
3. Ca(OCl)2 + 2 H2O = 2HOCl + Ca(OH)2

Sodium Meta Bi Sulfite dissolves (SMBS) in water to form Sodium Bi sulfite (SBS)
NaS2O5 + H2O = 2NaHSO3

Sodium bi sulfite react with Hypochlorous acid as follows
2NaHSO3 + 2HOCl = Na2SO4 + H2SO4 + 2HCl

Explain can large temperature differences in vaporizers cause operational problems?

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DIFFERENTIAL EQUATIONS - EXAMPLE 20.3 : A differential equation is given as y” + 5y’ + 6y = 0, y(0) = 2 and y’(0) = 3. By using Laplace transform, an engineer has correctly produced the equation L {y} = (2s + 13) / [(s + 2)(s + 3)] = A / (s + 2) + B (s + 3). (a) Find the values of A and B. (b) The inversed Laplace transform of 1 / (s + a) is given by exp (-at) where a is a constant. If the statement : L {y} = 9 L { exp (-2t) } - 7 L { exp (-3t) } is correct, find the equation of y as a function of t as a solution to the differential equation stated in the beginning of this question. When L {d} = 9 L {b} - 7 L {c}, then d = 9b - 7c with b, c and d are unknowns.

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Explain how does a tank-blanketing valve operate?

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sir i am senthil B.Tech Chemical Engineer which book is refer for objective type questions?

2 Answers   BARC, GATE,

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Calculate the cooling duty, H required to condense and cool acetone from 100 degree Celsius to 25 degree Celsius at atmospheric pressure. The heat of vaporization for acetone at its normal boiling point is 30.2 kJ / mol. The boiling point of acetone at atmospheric pressure is 56 degree Celsius. The flowrate of acetone through the condenser is 100 mol / s = N. Value of sensible heat needed to increase the temperature of acetone in liquid form from 25 to 56 degree Celsius is 4.06 kJ / mol. Value of sensible heat needed to increase the temperature of acetone in vapor form from 56 to 100 degree Celsius is 3.82 kJ / mol. Unit of H is kJ / s.

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What are the steps involved in wine making?

2 Answers   Aramco,

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what is defferance between tubular & automotive plate battery

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Explain what are some typical applications for glass-lined reactors?

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pleas tell me about chemical engineering apptitude test..

0 Answers   IOCL,

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To how much height the liquid willbe thrown out to atmosphere from a pump with a discharge pressure of 5bar

4 Answers   TCL,

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