9 replies to this topic

[AAZIZ]

Hello Everyone here, I hope all of you will be doing well.

 

We have one chemical reactor (7MT) with limpet coils, mineral thermic oil (250C at source) is used to heat this reactor. Following are the stages of reaction

 

1- Material will be added in reactor at 70C.

2- These materials will be mixed and heated to 130C (Time from 70C to 130C should be within 30 minutes).

3- This will be held at 130C for two hours and vacuum will be applied.

4- After vacuum, we will need to cool this material till 60C within 30-40minutes.

   

Please guide the control circuit for heating and cooling. For cooling, should we go with Air cooler or TEMA type heat exchanger?. For cooling through cooling water, what type of heat exchanger we should use to compensate thermal expansion as any type of leakage can not be afforded.

 

Looking for favorable response.

 

Regards,

 

[breizh]

Hi,

What kind of process is it? Polymerization ?

What are the raw materials used ? Solid ? Liquid ?

How is the final product? liquid ? 

 

Several options for cooling using cooling water 

      Internal coil if not deposit?

      External heat exchanger?  Shell and tubes or Plate heat exchanger! More Efficient 

 

Breizh

[AAZIZ]

Thank you Breizh for sparing your time....

 

Yes, its polymerization process, raw materials and final product is in liquid form.

 

I am asking about the option of cooling through cooling thermal oil being used for heating. Real thing for concern is if we will use cooling water in heat exchangers to cool oil then it should be leak proof as you know if moisture will go in main source of thermal oil then what it can do. I have attached file of proposed circuit, please review and guide if its okay to use this particularly which type of heat exchanger will be used here in this circuit.

Thank you again and looking for your favorable response.

 

 

 

Hi,

What kind of process is it? Polymerization ?

What are the raw materials used ? Solid ? Liquid ?

How is the final product? liquid ? 

 

Several options for cooling using cooling water 

      Internal coil if not deposit?

      External heat exchanger?  Shell and tubes or Plate heat exchanger! More Efficient 

 

Breizh

 

Attached Files

•  Thermal Oil Cooling System.pdf   107.61KB   104 downloads

Edited by AAZIZ, 20 January 2024 - 06:52 AM.

[breizh]

Hi,

I would say no!

You need two separate networks one for heating and one for cooling, The reason is the inertia of the system using a single intermediate fluid (hot oil) and the risk of run away if you don't manage properly the reaction. My comments are based on my experience producing latex and Resins in Asia and Australia.

Another issue is the design with a lot of manual valves meaning high risk of errors !

 

Let see what Latexman and others have to say.

 

Note 1: Forget about air cooler for the same reason, lack of control.

Note 2: Why don't you consider Steam or Hot water pressurized to heat up?  Attached a document to support.

 

Remember KIS (keep it simple) and stay safe.

 

Breizh 

Attached Files

•  PickHeaters-jacketed-heating-final.pdf   2.53MB   68 downloads

[latexman]

Is the RX exothermic or endothermic? I’d guess exothermic, but we have a few endothermic ones, and they use hot oil, but we go up to ~250 C on the process side.

[AAZIZ]

It is endothermic reaction

 

Is the RX exothermic or endothermic? I’d guess exothermic, but we have a few endothermic ones, and they use hot oil, but we go up to ~250 C on the process side.

[latexman]

With endothermic, no worries on runaway RX, and cooling response time is less important. A tempered hot oil system using cooling water and shell and tube heat exchangers is quite common. You need a reputable, experienced HE fabricator to come up with a good design.

[breizh]

Hi,

Wow!  Make sure you cannot transfer Hot oil to your cooling water system.

Can you or Latexman share with us example(s) of endothermic Polymerization reactions and catalyst used?

Thanks

Breizh

[latexman]

I prefer to “seal weld” the end of tube to the tube sheet to prevent water getting into the hot oil.

Our polyesters and alkyd resins are endothermic.

[breizh]

Hi Latexman,

Thanks

Breizh