My friend is a blender in the gas industry. I'm not exactly sure what it does, but it involves the stock market and buying different components of gas and making sure they get blended correctly to make fuel. She makes a crapton of money but the fact that her job title is "blender" always makes me giggle a little.
I hire blenders (among other things). They blend chemicals for the oil and gas industry. This can be anything from a high level role to a very entry level role. A blender operator just moves the barrels or chemicals around, monitors the cooker machines etc. A Sr. Blender or blender chemist actually modifies the chemical batch they are "cooking" for certain significations. i.e. use in ultra hot or cold environments