[blackcat]

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?

[OrganicDan96]

i assume you are thinking along the lines of atom economy?

[blackcat]

i assume you are thinking along the lines of atom economy?

Yes, please advise.

[OrganicDan96]

look up atom economy, it's a well known thing

[Babcock_Hall]

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.

[Borek]

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.

[blackcat]

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.