Questions tagged [filtering]

Filtering is a process in which chemicals are being separated using their different state of matter.

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34 views

To which extent is the function of an RO unit affected by inlet water type?

I want to purchase a Reverse osmosis water filter for my home but the issue is that the source of water supply is not always from a single source and hence parameters/properties of source water may ...
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Why isn't pressure filtration popular compared to vacuum filtration?

I want to build a DIY vacuum filtration apparatus with a bike pump but it's very difficult to find one the could be easily converted into a vacuum pump. This prompted an idea to simply build a reverse ...
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What zeolite types are typically used to absorb CO and CO2 gases at maximum zeolite absorption temperature?

Me and my friends are doing a project involving carbon monoxide and carbon dioxide as products to be filtered, we are using zeolites and would like to know the zeolite type typically used to filter $\...
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Can a solute be physically filtered out of a solvent?

Suppose that I have a substance dissolved in water. I then pour the solution into a filter. The filter's pores are large enough to allow the passage of water, but not the passage of the substance. In ...
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What are the practicle differences between gas and liqid microfilters?

In terms of very fine particle filters (pore sizes at about 0.2 micron), there seem to be some filters marketed/labeled to be for "air" (hence gases) and others for syringes (hence liquids) example ...
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169 views

How to effectively wash the precipitate or crystals on the filter and why?

My lab manual says that the precipitation on filter should be washed with a few small portions of the washing liquid. Why can't I just completely fill the filter funnel with the solvent instead of ...
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1answer
159 views

how to measure the efficiency of carbon filter [or of activated carbon/charcoal]?

Fake HEPA filters are easy to spot using DIY PM sensor and DIY Air Purifier (we just need to turn the fan ON, place the sensor's tube in front of it, and read the data). But what about carbon filters?...
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1answer
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Removing water/moisture from car exhaust [closed]

I know that car exhaust is almost entirely nitrogen, water and carbon dioxide. How would I go about removing the water? Would I have to condense it off? Any devices already exist for doing so?
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Benefits of a Buchner funnel w/ a fritted disc instead of Quantitative Filter Paper Circles

I was wondering if someone could enlighten me on some example us cases where one would be better of using a Buchner funnel with a fritted disc (example), as opposed to a Buchner "style" filter (...
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1answer
28 views

Can activated charcoal be used to filter bacteria out of air? [closed]

As the title says: Can activated charcoal be used to filter bacteria out of air and or gas?
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How to filter out sulfur dioxide [closed]

Lets say I have a container that contains a mixture of air and sulfur dioxide. I want to be able to filter out the sulfur dioxide from the air, how can I do this either through the form of a filter or ...
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Filtering fine particles before work-up (Tosylation)

I am trying on doing tosylation of PEG using Tosyl Chloride with pyridine. Some articles mentioned about filtering fine particles (pyridinium salts?) after diluting with DCM. But they did it with some ...
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How to separate two or more gases into different containers

I know this is probably an incredibly stupid question, but I'm making a hydrogen generator for a project. The basis of it is electrolysis of baking soda and water, which apparently gives off hydrogen, ...
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How are N95 masks different from dust masks?

There is a fire raging through my hometown right now. People in the area are advised to be wearing N95 masks to filter out smoke and particulates; and there is misinformation being spread that these ...
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Vacuum filtration: will Polymer elements interfere with the vacuum?

I am doing an experiment with vacuum filtration, where a Nylon filter is used to create a membrane (marked in pink in the picture attached). When I use the membrane, it frequently breaks in the ...
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2answers
874 views

How can I filter dissolved PVA from water

I'm working with a 3D printer that uses PVA filament as a support material. After a 3D printed part is made, it is put in water for some time to dissolve away the PVA supports. I'm trying to speed ...
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723 views

Can ethyl alcohol fumes be suppressed by a household air purifier/filter?

Can ethyl alcohol fumes be suppressed by a household air purifier/filter? In general, how are the fumes suppressed? How is it done? Can somebody direct me to some information regarding this? I've ...
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123 views

is there a filter to seperate glycerol and biodiesel?

i am currently working on a project of manufacturing biodiesel from cooking oils by the process "TRANSESTERIFICATION". at the end of this reaction, after the reaction mixture settles I have two layers ...
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3answers
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Filtration methods at removing ions present in water

I'm doing a lab where I have to first find out what ions are present in the water (easy part). The next part is to filter out those ions from the water. Here are some methods that are stated on the ...
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1answer
390 views

Find the molarity of the filtrate

I can't figure out this stoichiometry question! 10.0 mL of 1.15M copper(II) nitrate reacted with 20.0 mL of .85M ammonium hydroxide. The solution is filtered. Determine the molarity of the filtrate. ...
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Activated carbon filter vs. Reverse osmosis filter

I have a 5 month old baby and I'm currently using an activated carbon water filter with the city tapwater supply (I live in Mumbai, India and the water can be highly polluted sometimes with all sorts ...
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What is the difference between carbon and charcoal filters?

I'm confused about the difference between carbon and charcoal filters. Ultimately, charcoal contains carbon but I have come across an exam question that asks for their individual roles in a water ...
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What would you recommend to isolate these compounds from cooking oil?

Recycled cooking oil, aka "gutter oil", is a major problem in countries such as China. I am doing some research to see if there's a reliable and quick way to determine if something is gutter oil. I ...
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To what degree an N99 active coal filter can protect against products of burning paraffin oil?

I sometimes do firedance and a part of it is waving a stick with burning endings made of Kevlar soaked in paraffin oil. I started to be a bit concerned about how healthy is it to inhale lot of ...
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1answer
118 views

Particle size of oxides of nitrogen and sulfur pollutants and HEPA filters

I am thinking about buying air purifier as pollution is high in my city. Going through the specifications of HEPA filters, I found that they block particulate matter of 2.5. PM 2.5 contains dust and ...
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Do filter-specific dyes exist? Equivalently, do dye-specific filters exist?

Apologies if this isn't chemistry enough for chemistry.se. I'm happy to go elsewhere if there are suggestions. Blue + Red = Purple is arbitrary here. If any different colors might make this more ...
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419 views

Does Reverse Osmosis remove elemental ions from water?

From what I understand, RO is able to remove (or at least considerably reduce) the salts dissolved in water. But thinking about it just doesn't make sense. RO works by filtering the solution using a ...
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1answer
3k views

Separation of 2 compounds ( Powder )

Suppose I have a mixture of 2 pure binary compounds, a white powder. What is the best method to separate the 2 compounds? What I have thought of so far is to dissolve powder in DI water and carry ...
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1answer
6k views

Cleaning an overhead water tank using Alum or other chemicals?

Alum is generally used in water tanks to settle down solid impurities. Since it contains aluminium I suspect it to be toxic to humans. So are there any safe chemicals to clean large overhead tanks ...
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93 views

Water softener and RO filter

I have a water softener for showers and dishwasher and a reverse osmosis filter for drinking water. For convenience of the install, the RO filter is using softened water (some calcium carbonate has ...
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2answers
136 views

How to reduce the turbidity of a water sample? [closed]

A task requires us to experiment water quality. How would you reduce turbidity of a clay water sample with an effective and cost-effective method?
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1answer
2k views

How to remove nitrate from water sample?

Are there any simple methods to completely remove nitrate ions from few ml of impure water sample? One method I am curious about is the following process: Add one or more reagents to water in test ...
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2answers
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Separating citric acid from sugar

I'm trying to get as pure citric acid as possible from a mandarin. It's not because I desperately need citric acid, but because I want to achieve this. I started by grating the mandarine and ...
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Homemade filter paper

I used normal paper from my notebook to perform filtration. The filtration is 100% perfect, but takes incredibly long to happen, because the paper is too dense. I'm not planning to buy filtration ...
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5k views

Yellow-amber debris above water filter: What is it?

I have some weird, yellow-amberish pebbles that have been filtered by my Zero waterfilter. Any idea what they are? Copper maybe? The black stuff is charcoal from the filter. The quality of the water ...
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8k views

Diamond filtering - is it real or bogus?

I always hear that some big corporations use "diamond dust" to filter water seven times to make "diamond clear" vodka. I tried googling something about using diamonds for filtering, but I could not ...
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1answer
16k views

Remove formalin from food using chemical found in kitchen

In some parts of the world food is stored with formalin so it looks fresh forever! This is astonishing, but true (See refs here). As formalin is very bad for health and damages kidneys and liver very ...
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Negative retention for chloride in hydrolysate filtration

I tried to fractionate proteins as a function of their size with an ultrafiltration membrane. I observed a higher concentration of chloride in my permeate than in my feed or retentate. The proteins do ...
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Why does activated carbon preferentially adsorb anions?

Brands like Brita and Pur (in the U.S.) have made a name for themselves for the ability of their product (essentially a large-pore filter with activated carbon/charcoal) to extract the added chlorine ...