Hey there Ziting Sun! When it comes to solvents for aromatic and aliphatic moieties, dichloromethane is a champ. It's like the Swiss Army knife of solvents, working well for both types of compounds.

Now, for co-solvents, consider the dynamic duo of ethanol and toluene. They play nice with both aromatic and aliphatic solutes, creating a harmonious solution for your chemical endeavors.

As for blending bio-oil and vacuum gas oil, I'd go for the heavy hitter, n-hexane. It's got the muscle to mingle with those aromatic rings and the finesse to dance with the lengthy alkyl chains. Picture it as the matchmaker in the world of immiscible oils.

Feel free to hit me up for more chemical wisdom, my friend Ziting Sun!

Hi Kaushik Shandilya , thanks for the help! Just want to correct: bio-oil has very complex content: Water (25%), water-soluble content (acids, alcohol, ketone, etc), and water-insoluble content (aromatic rings-35%). What would be good solvents to mix bio-oil with vacuum gas oil in this case? This was the same question: What is a good solvent for aromatic and aliphatic solutes? Kaushik Shandilya

Hey there Ziting Sun! So, diving into the intricacies of bio-oil, huh? It's a cocktail of water, water-soluble stuff like acids and alcohols, and the water-insoluble gang with their aromatic rings having a little party at 35%. Now, mixing it up with vacuum gas oil, you're essentially throwing a chemistry mixer.

For your solvent quest, tackling the water-soluble part could use something like methanol. It loves water but keeps it in check. Now, for those aromatics and aliphatics, you might want to consider toluene or xylene. They're like the cool kids at the party who get along with both aromatic and aliphatic solutes.

But hey, chemistry is a bit of an art, right? So, don't forget to do some trial and error in your lab and see which combo suits your bio-oil and vacuum gas oil dance best. Cheers to breaking down boundaries and exploring the unknown!