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Questions tagged [green-chemistry]

Green chemistry, also known as sustainable chemistry, is a philosophy intended to reduce the environmental impact of chemical industry and research. A discussion of possible modifications of the process to reduce the production of the hazardous material should be tagged as green-chemistry. A question concerning the environmental interactions of hazardous chemicals should rather be tagged with `environmental-chemistry`.

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1answer
60 views

Why do we use coefficients for RFM (relative formula mass) in atom economy? [closed]

Usually when calculating using moles = mass / RFM, the coefficient is not multiplied by a compound's RFM to calculate RFM. But in calculations for atom economy, the (balanced) coefficient of a ...
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1answer
30 views

what is the basic idea for making bioplastic? [closed]

I have the following questions about making bioplastics: Why is only lactic acid used in making bioplastic? Are there any other methods used in making bioplastic without converting starch into lactic ...
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1answer
47 views

Function of 'organic' vs regular pipe cleaner

Recently, I needed to buy some pipe cleaner, as sometimes even with care hair and other detritus gets lodged so deep down the shower drain that it is not possible to get it out. I always try to avoid/...
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0answers
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Deperoxidation of ethers via alumina: what happens?

I was reading about the procedures for the removal of peroxides from ethereal solvents, and a procedure which seems to have survived to our days is filtration through a column of "activated alumina" (...
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1answer
31 views

What is spatially and chemically heterogeneous materials?

Follow this paper, Structural analysis of humins formed in the Brønsted acid catalyzed dehydration of fructose They explained "humins are spatially and chemically heterogeneous materials." I found ...
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2answers
179 views

Using acetone instead of acetonitrile on reverse-phase prep-HPLC

I've been using reverse phase prep-HPLC a LOT lately, and I'm growing increasingly concerned about the amount of acetonitrile needed. In an attempt to use a cheaper and more environmentally friendly ...
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1answer
1k views

Synthesis of Copper(I) Iodide

Copper(I) iodide is usually made by the reduction of copper(II) salts. An example of using potassium iodide and copper(I) sulphate is shown below. $$\ce{2CuSO4 + 4KI + 2Na2S2O3 -> 2CuI + 2K2SO4 + ...
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4answers
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Why is fermentation of cellulose to produce biofuel and nutrients so difficult?

The formula for glucose is $\ce{C6H12O6}$ and that of cellulose is very similar $\ce{C6H10O5}$. Glucose can be readily fermented by yeast and other micro-organisms to produce carbon dioxide and ...
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2answers
294 views

Can't we reduce climate change by converting CO2 & CH4?

Straight off I want to say, I never took chemistry classes, so my understanding is very limited. My question is considering the equations below, why is it so hard to reduce greenhouse gases? Is it ...
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1answer
74 views

Can somebody please explain this statement (about the greenhouse effect)?

"Methane is a potent gas and over a period of 20 years has a 72 times greater effect on warming the atmosphere than carbon dioxide. Due to my limited english, i am failing to understand how timeline ...
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1answer
81 views

Phosphate extraction from sewage

I read that phosphate reserves will exhaust in coming years wiki, why don't we extract it from sewage , is it really that difficult to extract phosphate ?
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3answers
600 views

What happens to a greenhouse gas after it absorbs infrared radiation?

We say that a greenhouse gas increases the temperature of the surface of the earth but how does it do that ? Only by re emitting the absorbed IR towards the earth ?
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1answer
220 views

Why does a gas' ability to absorb infrared radiation affect its potency as a greenhouse gas?

My book says that the ability of a gas to absorb infrared radiation affects its potency as a greenhouse gas, but I don't understand why. So what if a gas is able to absorb a lot of IR? How does that ...
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2answers
262 views

Toluenesulfonate vs. methylsulfonate

Are there any advantages/disadvantages of using toluenesulfonate instead of methylsulfonate as a leaving group in E2 and SN2 reactions? I know they are both excellent leaving groups but how do they ...
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1answer
69 views

Energy cycle centered around methane production / consumption

Many car manufacturers have developed projects for hydrogen cars but I've always been wondering why they put so much effort into hydrogen, as it is hard to store, and fuel-cells use to restitute ...
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1answer
83 views

How do Shaving Creams, Foams, Soaps ensure cut Hair Fragments that stick & clump between Safety Razor blades are easily washed away?

This is my first post on Chemistry SE and I figure it's pretty chemical oriented. On Sustainability SE we were trying to find "organic & natural" alternatives which are okay for lubrication &...
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0answers
135 views

How can I get rid of 700 million tons of chlorine gas?

I am conducting a thought experiment in which 40 million tons of hydrogen are supplied through saltwater electrolysis each year, creating 700 million tons of chlorine gas (Cl2) and 800 million tons of ...
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0answers
148 views

What happens to particulate matter after collection via electrostatic precipitator?

What I understand about electrostatic precipitators is that the particles become ionized due to corona discharge and thus are attracted to the oppositely charge plate. This would work as long as the ...
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2answers
916 views

Can we recycle garbage with the principles of mass spectrometry?

'Mass Spectrometry (MS) is an analytical technique that sorts ions based on their mass (or "weight"). Mass spectrometry is used for many chemical analyses, ranging from the analysis of a complex ...
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1answer
166 views

How to recycle 60 tons/hour of CaCO3?

I hope this is the right place to ask. I'm not a chemist so my question may seem obvious but it's not for me. I work in the egg industry and we produce every hour 60 tons of dried egg shells as waste....
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1answer
70 views

Why perborate is greener bleaching agent?

All I know is, perborate degrades into supposedly less harmful compounds. But what exactly happens that it is considered greener? Consider say perborate vs. hypochlorite. Why perborate is "greener"?
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1answer
6k views

Why does ozone, being heavier than air, not settle down? [duplicate]

Is this because of some equilibrium between diffusion and gravity ? What exactly is responsible?
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0answers
233 views

What are the dangers of melting HDPE and silicone? Is it even possible?

I've searched the internet and couldn't find a specific answer. There doesn't seem to be a single recycling company that takes empty silicone tubes (also know as mastic tubes) and recycles them. As a ...
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1answer
75 views

CO2 dry cleaning what is the process

From what I understand CO2 drycleaning is essentially heating and pressurizing Co2 until it is at a supercritical state and then using it as a solvent to wash clothing. I just don't understand why ...
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2answers
557 views

How can we produce gasoline from electricity without fossil fuels?

The other day, I was wondering, if cheap and easy nuclear fusion were developed tomorrow and fossil fuels disappeared, would there be a way to fuel all the gas-powered cars out there? After all, we ...
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1answer
79 views

Is it possible to recycle an alkaline battery?

Is it possible to recycle an alkaline battery? The application I am thinking about is that in 3rd world countries often access to western markets is limited. You can't just pop into a store and buy ...
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1answer
183 views

Creating small amounts of cellulosic ethanol from bamboo

I own a medium-sized farm and commercial aquaponics business in Pennsylvania. I try to make my business as green, sustainable, carbon-neutral and self-sufficient as possible. As a way to cut out the ...
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1answer
2k views

Can Fuel Exhaust Be Recycled

When the spark plug of a car ignites the pressurized air/fuel mixture, could you instead send the exhaust to another system within the car to be Recycled? I think it's a great idea that could ...
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1answer
927 views

TPE fabric vs PVC fabrics?

I am currently in charge of purchacing fabrics from asia. My personal policy is to try and stay as enviromentally freindly as possible. Your answer to the following question would be of great help and ...
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1answer
200 views

How is the process of creating PVC fabrics harmful for the environment?

I often hear that the production process for PVC fabrics (such as those used in Gucci and Versace handbags) is very harmful to the environment. What part of the process is harmful and can this be ...
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0answers
1k views

What are the specific disadvantages of using a bio-catalyst (called Lipolase) in the synthesis of the drug pregabalin?

I am studying the synthesis of a drug pregabalin, for which both chemical and bio-catalysts are used. Using a biocatalyst is way better than chemical route, as explained here. In fact, The invention ...
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1answer
1k views

Using sodium peroxide to scrub carbon dioxide emissions

I am a student from a school and recently I came across the reaction $\ce{2Na2O2 + 2CO2 -> 2Na2CO3 + O2}$ Can't we use this reaction to reduce $\ce{CO2}$ in the atmosphere by placing some $\ce{...
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1answer
144 views

Why fossil fuel is too dangerous?

This seems stupid question, but from many years I am studying that burning/combustion fossil fuel cause pollution because it releases $\ce{CO2}$. I have recently read about $\ce{CFC}$ here, which is ...
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1answer
793 views

Efforts made to reduce the amount of CFC

Till now I have heard $\ce{CO2}$ is the main reason of global warming. I have studied the remedies to control $\ce{CO2}$ many times through books, awarness programs, etc. But today I learned about ...
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3answers
1k views

Quantifying CO2 generated/released by the soft drink industry and breweries

I need some help in developing a method by which to calculate how many tons of "evil" $\ce{CO2}$ are routinely being released into the atmosphere SOLELY due to our beverage addictions, notably beer ...
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2answers
544 views

Biopolymers as alternative for PVC and PU?

I'm working on a project making a product line more sustainable, environmentally friendly and ready for recycling. Now I'm searching for good and suitable biopolymers for a part of the product that ...
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1answer
322 views

Air recycling system(CO₂-->O₂) or (CO₂-->fuel)?

I'm not a chemist but I'm working on an eco-friendly project that is supposed to recycle $\ce{CO2}$ from the air and convert it to $\ce{O2}$ or at least a usable fuel source ,the system can use the ...
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2answers
529 views

Create my own solar cells?

How would I grow my own and build functional solar cells? I've read and researched that they're mostly a crystal structure of something like silicon. I would assume I'd be able to grow my own crystals ...
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4answers
1k views

Is it possible to produce graphene out of air?

In theory you should be able to turn $\ce{CO2}$ to $\ce{CO}$ and then to $\ce{C}$ and connect all the C-atoms together to form graphene. That should be possible, because plants do something similar, ...
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2answers
428 views

What are the major environmental drawbacks with using methane as a combustable fuel?

What are the biggest environmental issues with using methane, $\ce{CH4}$, (which is found as the major energy source in natural gas, shale gas, biogas, and synthetic natural gas), as a combustible ...
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1answer
602 views

What is the chemistry behind this “petrol from air” technology?

A recent news report in the UK claimed a breakthrough in making a petrol equivalent from carbon dioxide and water: A small British company has produced the first "petrol from air" using a ...
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1answer
129 views

How does the work that won the 2012 Sustainable Chemistry Award contribute to sustainable chemistry?

I'm seeking a lay explanation for how the work of Dr Marc Taillefer that won the 2012 European Sustainable Chemistry Award, contributes to sustainable chemistry. From the press release, Dr. Taillefer ...
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1answer
940 views

Isolating salt from sea water using filters

Could a filter be used to isolate salt from sea water? Could we say that the water molecules are smaller than the molecules of salt dissolved in the water. I have no relation to chemistry or physics, ...