What is carbon capture? And how does it work?

While carbon capture is regularly discussed in the media, no one really ever explains what it is.

Below is a quick thread discussing the technology behind traditional carbon capture 👇

Carbon capture is broadly the "capture" of CO2 emissions from a power plant or other type of industrial facility.

Technology is connected to the "tailpipes" of these facilities and is used to remove CO2 from the plant exhaust.
Once the CO2 is removed from the plant exhaust, it is typically pressurized and sent under ground for permanent storage.

This step is called "sequestration" and is why experts often talks about "carbon capture and sequestration" or "CCS".
So how do you "capture" the CO2 molecules from exhaust?

Currently, one of the most economic forms of carbon capture is called "amine-based" capture.

An "amine" is a special liquid chemical which selectively grabs on to CO2 molecules.
To get the amine to grab on to the CO2, the amine is put into the top of a large column, while the exhaust is put into the bottom of the column.

The exhaust bubbles up through the column, and the amine drips down.

The liquid amine and gas exhaust mix in the column.
The amine selectively "dissolves" the CO2 in the first column, while letting the rest of the air pass through.

The amine with dissolved CO2 is sent into a second column where it is heated.

In the second column, the CO2 pops out of the amine.

Now, we have separated the CO2.
These columns are often called "scrubbers" ...and if you ever drive by a plant, you might see these columns.

Below is a picture of an amine plant used for CO2 scrubbing.
Finally, once the CO2 is separated, it is compressed to extremely high pressure and prepared for sequestration.

The CO2 is injected into a well for permanent storage underground, usually a few hundred yards away.
As @tlancaster50 from my team notes, there are other ways of capturing CO2

What I've described is called "point source capture" because it captures CO2 from a single plant exhaust

With new advances in technology, CO2 can also be captured directly from the air we breathe
Thats the summary! Hope this was helpful.

Please ask questions in the comments, and I will continue to post more about carbon capture (economics, scalability, etc) in the near future.

More from Science

Read this thread from @lilithsaintcrow. I really mean it. Just read it. Because if what she is saying is true (and I happen to think it is) it explains *so much*

An example using the Flat Earthers: A thread of many parts:


I'm firmly convinced that the flat Earth thing was started by some adolescent trolls with nothing more productive to do. They didn't believe it, but they thought it was entertaining to keep pretending that they did.

You can't engage with them, because they *are playing a game*. They think it's fun to see if they can get anybody to engage with something completely stupid as though it's true.

If you challenge them, the rules of the game state that they have to argue as hard and a spuriously as they like, but *never* to admit that the Earth is not in fact flat. I suppose you have to make up your own entertainment on 4chan or whatever hole this was conceived in.

It's annoying as hell, but I suppose it doesn't do much harm.. except to folks like this:

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शमशान में जब महर्षि दधीचि के मांसपिंड का दाह संस्कार हो रहा था तो उनकी पत्नी अपने पति का वियोग सहन नहीं कर पायी और पास में ही स्थित विशाल पीपल वृक्ष के कोटर में अपने तीन वर्ष के बालक को रख के स्वयं चिता पे बैठ कर सती हो गयी ।इस प्रकार ऋषी दधीचि और उनकी पत्नी की मुक्ति हो गयी।


परन्तु पीपल के कोटर में रखा बालक भूख प्यास से तड़पने लगा। जब कुछ नहीं मिला तो वो कोटर में पड़े पीपल के गोदों (फल) को खाकर बड़ा होने लगा। कालान्तर में पीपल के फलों और पत्तों को खाकर बालक का जीवन किसी प्रकार सुरक्षित रहा।

एक दिन देवर्षि नारद वहां से गुजर रहे थे ।नारद ने पीपल के कोटर में बालक को देख कर उसका परिचय मांगा -
नारद बोले - बालक तुम कौन हो?
बालक - यही तो मैं भी जानना चहता हूँ ।
नारद - तुम्हारे जनक कौन हैं?
बालक - यही तो मैं भी जानना चाहता हूँ ।

तब नारद ने आँखें बन्द कर ध्यान लगाया ।


तत्पश्चात आश्चर्यचकित हो कर बालक को बताया कि 'हे बालक! तुम महान दानी महर्षि दधीचि के पुत्र हो । तुम्हारे पिता की अस्थियों का वज्रास्त्र बनाकर ही देवताओं ने असुरों पर विजय पायी थी।तुम्हारे पिता की मृत्यु मात्र 31 वर्ष की वय में ही हो गयी थी'।

बालक - मेरे पिता की अकाल मृत्यु का क्या कारण था?
नारद - तुम्हारे पिता पर शनिदेव की महादशा थी।
बालक - मेरे उपर आयी विपत्ति का कारण क्या था?
नारद - शनिदेव की महादशा।
इतना बताकर देवर्षि नारद ने पीपल के पत्तों और गोदों को खाकर बड़े हुए उस बालक का नाम पिप्पलाद रखा और उसे दीक्षित किया।