4 replies to this topic

[mosa]

I have a small empty tank of capacity 2000 lits of ID-1500MM and H - 1250MM.Now i want to prepare a caustic batch of strength of 25wt% in small tank from the available 50wt% caustic solution in a seperate big tank.What is the quantity of 50%wt caustic to prepare 25%wt in a small tank and how much water to be added?What is the Height to be in tank if water and 50%caustic are added seperately to form a 25%wt solution

Kindly provide me in steps for better understanding


Regards
husam

[breizh]

Dear Husam,

First of all be cautious when you want to dilute caustic soda with water , you will generate heat !
having said that you need to do a mass balance and thermal balance .

You need to define the quantity you want to prepare based on the size of your tank and then do the math.

have a look at Solvay technical bulletin ( dilution) , you will find all the data , including mass and thermal balances .

www.solvaycausticsoda.com

Breizh

[Art Montemayor]

Husam:

Weigh and study carefully the thoughtful and expert advice you have received from Breizh. There is a lot of important and vital information in what he recommends.

Although adding an inorganic compound to water might seem like a routine and boring job better left to an uneducated laborer or maintenance person, the process is full of hazards and danger. As Breizh clearly states, the mixing will generate spontaneous heat and violant splatter of both solid caustic and water particles. The mixture is CAUSTIC, and often fatal to mucous membranes in the human body - items such as eyes, lips, nose, and sensitive skin areas. The effects of caustic splatter can often result in total loss of eyesight, severe caustic burns and wounds that might not heal, and painful and potentially permanent wounds. Caustic is a mortal enemy of human flesh - it immediately starts to decompose it when it contacts it.

Please read all the literature you can find on safely handling caustic and its solutions - especially the Sovay manual. You will find responsible and recognized caustic suppliers - such as Solvay - ready to supply you with information and service on how to deal and prepare for Caustic handling and mixing. Resort to using supervised, trained personnel to do this operation.

[mosa]

Dear Art & Breigh

Thank you for your valuable safety inputs.It is appreciated if you could provide me solution to my query.

Regards
Husam

[Art Montemayor]

husam:

Let us all get something perfectly clear in this Student Forum: we professionals are here to help you – not to clean your diapers and spoon-feed you the complete, correct “answers” so that you can turn them in for credit and have more free time on your hands to party and have a good time. We want to help you out by teaching you what you will find in the engineering profession when you graduate – a lot of tough, complex problems that will require YOUR initiative and resourcefulness – like looking for places and persons that can help you resolve YOUR OWN problems.

We have already furnished you with vital information that should assist and help you design a safe, and adequate vessel – as well as write up safe and acceptable operating procedures for that operation. If you require more specific answers on how to properly design a simple, atmospheric vessel to mix caustic soda, something is either wrong in your engineering preparation or in your own willingness to learn and train yourself.

Your problem is so simple, that it is normally found in high school chemistry courses. Are you a high school student? I have assumed that you are a University engineering student and, as such, fully capable of understanding this simple of a problem. Please explain to us what your situation is and perhaps we can assist you further if you are not at university level.