Make Acetic Acid from wood
Acetic acid is present in 'wood vinegar' that you get by thermal destruction with a lack of oxygen.
Steam can be used as a source of heat, but to be of any help in your desired production it would have to be overheated or under very high pressure, about 100 atmospheres. It is still useful as a way to increase the yield a bit.
Likely the best way is to heat the wood to 300*C without oxygen, collect and cool the gaseous products to condense them. You will get wood vinegar.
https://en.wikipedia.org/wiki/Pyroligneous_acid
After this you can separate the products using distillation.
https://en.wikipedia.org/wiki/Distillation
About 70 % of wood mass will be converted during the thermal destruction into wood vinegar.
About 15 % of wood mass will become non-water wood vinegar.
About 5 % of wood mass will become acetic acid.
Small yield, toxic waste, energy intensity of the process, are reasons why this process is not used anymore.