I'm trying to understand pre-combusiton carbon capture processes as described in this presentation.
I'm told that solvents such as chilled methanol ($\ce{CH3OH}$) and dimethyl ethers of polyethylene glycol ($\ce{C_{2n}H_{4n + 2}O_{n + 1}}$) can dissolve $\ce{CO2}$ from a gasified coal fuel (before combustion) under the action of increased pressure. I'm struggling in understanding how the increased pressure induces the dissolution of $\ce{CO2}$ from the gasified coal. I'm also a bit rusty with my chemistry, by saying $\ce{CO2}$ is dissolved by the solvents, what is really going on, chemically?