Launch HN: Heimdal (YC S21) – Carbon neutral cement
I did some lengthy analysis behind the chemistry / economics and wrote it up here.<p><a href="https://www.moderndescartes.com/essays/carbon_neutral_concrete/" rel="nofollow">https://www.moderndescartes.com/essays/carbon_neutral_concre...</a><p>TL;DR: ignoring all sources of overhead/inefficiency and purely on consideration of thermodynamic costs, $70 of electricity can generate $100 of lime, $300 of chlorine gas, and $75 of hydrogen gas.<p>Much more details on the chemistry and economics in the blog post...