Using cold coffee?

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chuck_n_grace
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Using cold coffee?

Post: #228227 chuck_n_grace
Sat Apr 09, 2011 11:26 pm

Hi,
We recycle our coffee grounds into the compost bins. Grace uses them for the roses and some other plants.

How about the leftover coffee in the pot? Can it be used too? Applied directly to the soil around plants?

Regards,
Chuck

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Re: Using cold coffee?

Post: #228229 frozenthunderbolt
Sun Apr 10, 2011 12:45 am

It may be good for blueberries as it is mildly acidic
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chuck_n_grace
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Re: Using cold coffee?

Post: #228235 chuck_n_grace
Sun Apr 10, 2011 3:46 am

frozenthunderbolt,
That's what were thinking. We regularly have a couple of extra cups leftover each day. I would like to collect it and use it somehow. Our left side of the front garden is our 'acidic' bed so this just might work. I'll start tomorrow.

Thanks,
Chuck

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Re: Using cold coffee?

Post: #228247 contadina
Sun Apr 10, 2011 7:08 am

Forget the garden and think granita :iconbiggrin: Add sugar to the coffee, part freeze in a plastic bottle then shake, continue in this fashion until you have little coffee ice granules and store in the fridge (refreezing when necessary). Perfect for hot summer days.

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Re: Using cold coffee?

Post: #228252 oldjerry
Sun Apr 10, 2011 7:31 am

Or open a bottle of Marsala,and make TIRAMASU......then invite me round....! Best Wishes.

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Re: Using cold coffee?

Post: #231676 Glen Gilchrist
Wed May 11, 2011 6:54 pm

You can extract up to 15% coffee oil from used coffee grounds (acetone extraction) -- evaporate off the acetone. The coffee oil can then be turned into really good bio diesel, or burned directly in a wicked lamp.

Smells lovely!!!

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Re: Using cold coffee?

Post: #231707 wulf
Thu May 12, 2011 6:58 am

For non-chemists, how does that work? I am guessing that you pour on acetone, which dissolves the oils, pour off the resulting liquid and then gently heat in a well-ventilated place so that you are left with the oil?

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Re: Using cold coffee?

Post: #231962 Glen Gilchrist
Sat May 14, 2011 6:37 pm

Yea....

The oil in any vegetive matter can be removed by either steam distillation ( better, but more complex), pressing ( works best for BIGGER items such as olives) or solvent extraction. Acetone is used as it has a low boiling point, so can be easily removed from the extracted oil.

1) Place coffee grounds ( wet is fine) in suitable container and cover with acetone until grounds ate just covered.
2) leave covered for as long as you can suffer. ( commercially, they will reflux the mix - boil and capture the acetone and reuse)
3) evaporate off the acetone ( into the air if you must). Ideally capture the acetone and reuse.
4) use the oil to make biodiesel (Or as an intense coffee flavor)

Might only work if you can get access to the right glassware.....

We did this with our sixth formers.

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Re: Using cold coffee?

Post: #231985 The Riff-Raff Element
Sun May 15, 2011 7:17 am

One can by something called a Soxhlet extarctor, which is a set of chemist's glassware used for the highly efficient recovery of organic chemicals via a continual recycling of solvent. It's good old bucket chemistry!

Amazon in the US sell them and they should be pretty easily available elsewhere. Couple this with a simple still to recover the solvent (and for Heaven's sake use a proper heater designed for flamable liquids) and you'd be in buisness. You could extract all kinds of stuff. The globe would be your mollusc.

http://www.amazon.com/gp/product/B003NUUGVM/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=1278548962&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B0041502J4&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0HRCAZGTEAHX63R0KX6T

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Re: Using cold coffee?

Post: #231992 dave45
Sun May 15, 2011 9:39 am

It looks great fun, but the kit seems a smidge expensive!

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Re: Using cold coffee?

Post: #231993 dave45
Sun May 15, 2011 9:46 am

btw what is the boiling point of acetone, and where can you get it cheaply in quantity?

or can you make it out of leftovers?
:-)

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Re: Using cold coffee?

Post: #231998 Glen Gilchrist
Sun May 15, 2011 11:23 am

Acetone boils at 56'c - generally available in chemical Catalogues. Not proscribed or on dodgy lists. If you just want coffee "flavour" use vodka instead...... Then you can just add it straight away...

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Re: Using cold coffee?

Post: #231999 The Riff-Raff Element
Sun May 15, 2011 11:43 am

dave45 wrote:It looks great fun, but the kit seems a smidge expensive!


An investment, certainly, but quite often this kind of kit comes up on ebay and so on and can go pretty cheap.

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Re: Using cold coffee?

Post: #232139 Mrs H
Tue May 17, 2011 8:53 am

Ok so am I being a bit blonde here?!? R u trying to say that I can recycle my coffee grounds and use it to run my landrover? X

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Re: Using cold coffee?

Post: #232179 Glen Gilchrist
Tue May 17, 2011 12:09 pm

Yes - in a nutshell.

Coffee grounds (used) are about 15% coffee oil, which can be processed really easily into biodiesel. Most diesel engines can use biodiesel without modification and people arguee that its clear / better for the engine than fossil diesel.

Google "bio diesel"

Essentially you mix the oil (use cooking oil, coffee oil etc) with a mixture of sodium hydroxide (lye from soap making) and methanal and it reacts to make biodiesel and some glycerol (can be used to make soap later).

We (as a school) are currently swapping emails with Cafe Nero to try this on a large-ish scale...

Cheers
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