A gallery of home built hoods and fume scrubbers _hood_

[J.Najam]

Hello,

Long time coming I think Im almost done here.. if there is something that Im missing I would love to know.

The cut pvc in the bucket, I will use as the packing for the scurbbing cylinders.

Also I decided to use these cups in the last image for the bottom of my cylinders, in order to not let the packing clog the opening of the valve. It has holes in it to let the air travel, i did some test runs and the airflow seems fine but I did notice that some bubbles stay in there even after shutting off the pump. When I shake the cylinders I feel some movement inside of it like a tell that some bubbles just left the cup. So let me know of it still is OK to carry on?

Many thanks for your time again.

 

[J.Najam]

Cut a small opening.
Put in some glass and let the light be on the outside.

Yep. Done

 

[4metals]

Please, Stand back a bit and take a photo so we can see the perspective of the hood and the scrubber.

 

[J.Najam]

Please, Stand back a bit and take a photo so we can see the perspective of the hood and the scrubber.

Alright, ill try my best to make it easy. Unfortunately the lane is very narrow so this is as far as I can take. But I'll take different shots

 

[Yggdrasil]

Hello,

Long time coming I think Im almost done here.. if there is something that Im missing I would love to know.

The cut pvc in the bucket, I will use as the packing for the scurbbing cylinders.

Also I decided to use these cups in the last image for the bottom of my cylinders, in order to not let the packing clog the opening of the valve. It has holes in it to let the air travel, i did some test runs and the airflow seems fine but I did notice that some bubbles stay in there even after shutting off the pump. When I shake the cylinders I feel some movement inside of it like a tell that some bubbles just left the cup. So let me know of it still is OK to carry on?

Many thanks for your time again.

Hmm.
What system are you using here?
Vacuum or flow through?

 

[J.Najam]

Well I got some new clicks here, this is the best I could do in the space I have.

1 and 2nd picture is the perspective of my fumehood. The chair there is referential to the space between the hood and the wall.

3rd, the fumehood itself.

4th and 5th the scrubbing system

6th the issue : i noticed the wall has cracks and initially I planned on getting the exhaust pipe next to the other two. But since there seems to be danger so now im thinking of creating a loop around the whole cabinet. I may have to insert an extra blower midway to ensure the air throw is proper out the exit.

I would also like a suggestion on the position of the exhaust fan. I ran a couple of tests and it seems like the fumes are being drawn from under the funnel too. I used a cigarette, stuck it in ash tray and placed it inside the beaker and covered it with a watchglass. The emissions were barely going up the funnel and more in the fan. Although it will be tough to get carve another hole manually, but if need be I ll do it. So let me know if it will be needed or there can be another way.

Hmm.
What system are you using here?
Vacuum or flow through?

Im using the vacuum system here. What would be flow through again sorry?

Many thanks for your time again.

 

[Yggdrasil]

Well I got some new clicks here, this is the best I could do in the space I have.

1 and 2nd picture is the perspective of my fumehood. The chair there is referential to the space between the hood and the wall.

3rd, the fumehood itself.

4th and 5th the scrubbing system

6th the issue : i noticed the wall has cracks and initially I planned on getting the exhaust pipe next to the other two. But since there seems to be danger so now im thinking of creating a loop around the whole cabinet. I may have to insert an extra blower midway to ensure the air throw is proper out the exit.

I would also like a suggestion on the position of the exhaust fan. I ran a couple of tests and it seems like the fumes are being drawn from under the funnel too. I used a cigarette, stuck it in ash tray and placed it inside the beaker and covered it with a watchglass. The emissions were barely going up the funnel and more in the fan. Although it will be tough to get carve another hole manually, but if need be I ll do it. So let me know if it will be needed or there can be another way.


Im using the vacuum system here. What would be flow through again sorry?

Many thanks for your time again.

For a vacuum system there is not much need of packing's.
Only liquid and since you have 5 cylinders there is plenty of retention time.
Flow through, is where you put all your air from the hood through scrubbers with packing.
If there is not enough vacuum the air/fumes from the reaction vessel will not be dragged through the funnel.
How much vacuum do you have?
Maybe you need to bypass two of your cylinders?

 

[J.Najam]

For a vacuum system there is not much need of packing's.

With due respect, I guess I may have mentioned it earlier that Ill be using a vacuum pump for suction and the packing discussion followed...

Only liquid and since you have 5 cylinders there is plenty of retention time.

This sounds as a relief

Flow through, is where you put all your air from the hood through scrubbers with packing.

got it maybe in the future

If there is not enough vacuum the air/fumes from the reaction vessel will not be dragged through the funnel.

i have done many tests without the presence of the fan. The fumes were being dragged in through the funnel just fine. But now when everything is put together, the fan just seems to be an overkill. Im doubting it is probably its position in the hood is all.

Maybe switch it off when undergoing the regular vacuum suction operation. Would that be safe enough?

Maybe you need to bypass two of your cylinders?

3 tall ones are regular and will be filled with NaOH. The smaller glass bottle is for the backflow and the taller one is basically a tell for the vacuum strength. Since each has their own purpose, I wouldn't want to disturb it

Thanks for your time

 

[J.Najam]

Hello again,

So my dad wont lend me his cigarettes anymore for these tests as they were all being wasted. So I tried again today with boiling water as another test. I wish Id taken some clicks but Id like some clarification as per my observations :

1, the fumes tend to condense and form drops around the inside ring of the funnel and they then drop onto the hotplate. What is suggested to combat this concern?

2, the vacuum started to function alright. The glass bottles were a great tell as initially the bottles had some smoke coming in and then it started to condense into vapours. However, I noticed considerable emissions from the funnel, are they supposed to go upstream into the funnel too or should I just make peace with it and move on? Like both things are happening, the vacuum is pulling it but there are noticeable emissions too.

Many thanks for your time again

 

[Yggdrasil]

Hello again,

So my dad wont lend me his cigarettes anymore for these tests as they were all being wasted. So I tried again today with boiling water as another test. I wish Id taken some clicks but Id like some clarification as per my observations :

1, the fumes tend to condense and form drops around the inside ring of the funnel and they then drop onto the hotplate. What is suggested to combat this concern?

2, the vacuum started to function alright. The glass bottles were a great tell as initially the bottles had some smoke coming in and then it started to condense into vapours. However, I noticed considerable emissions from the funnel, are they supposed to go upstream into the funnel too or should I just make peace with it and move on? Like both things are happening, the vacuum is pulling it but there are noticeable emissions too.

Many thanks for your time again

If your vacuum is correct all the fumes should go through your flask train