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Topic: About mass efficiency of a reaction  (Read 338 times)

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Offline kamiyu2550

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About mass efficiency of a reaction
« on: February 23, 2020, 09:55:16 AM »
Not just talking about yield of a reaction, but mass of product relative to the mass of all reactants. This is a Green Chemistry idea.

What is a good mass efficiency? Any idea?

Offline OrganicDan96

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Re: About mass efficiency of a reaction
« Reply #1 on: February 23, 2020, 02:09:05 PM »
i assume you are thinking along the lines of atom economy?

Offline kamiyu2550

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Re: About mass efficiency of a reaction
« Reply #2 on: February 23, 2020, 11:42:57 PM »
i assume you are thinking along the lines of atom economy?

Yes, please advise.

Offline OrganicDan96

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Re: About mass efficiency of a reaction
« Reply #3 on: February 24, 2020, 11:41:16 AM »
look up atom economy, it's a well known thing

Offline Babcock_Hall

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Re: About mass efficiency of a reaction
« Reply #4 on: February 24, 2020, 07:17:55 PM »
http://www.rsc.org/suppdata/cs/c1/c1cs15219j/c1cs15219j.pdf
Mass efficiency is defined in a different way versus atom economy.  I don't feel well versed enough in this subject to compare one metric to another.

Offline Borek

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Re: About mass efficiency of a reaction
« Reply #5 on: February 25, 2020, 03:46:16 AM »
What is a good mass efficiency?

Somehow I am not convinced there exists something like a "good value of mass efficiency". It is a relative thing that can be used to compare different processes yielding the same final product, but I doubt in sense of comparing processes yielding different products.

Producing one ton of steel uses 280 m3 of water, producing one ton of beef requires 4000 m3 of water*. Do you thin you can draw any conclusions from comparing these numbers?

*different sources give different numbers, exact values don't matter here.
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Offline kamiyu2550

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Re: About mass efficiency of a reaction
« Reply #6 on: February 25, 2020, 11:34:16 AM »
What is a good mass efficiency?

Somehow I am not convinced there exists something like a "good value of mass efficiency". It is a relative thing that can be used to compare different processes yielding the same final product, but I doubt in sense of comparing processes yielding different products.

Producing one ton of steel uses 280 m3 of water, producing one ton of beef requires 4000 m3 of water*. Do you thin you can draw any conclusions from comparing these numbers?

*different sources give different numbers, exact values don't matter here.

I understand your point.
However, the original intent for my post is to ask if there is any general value of good mass efficiency, especially in industry. If there isn't such a thing, that's alright.

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