Sounds like you are in the right temperature range, though a little high on pressure.
Shortpath distillation isn't my area of expertise, and much of what I do know, I learned from folks I have non-disclosure agreements with, so let's be safe and see what Pharmer Joe, our SPR short path guru, is willing to share.
He not only took organic chemistry in this century, but builds his own short path equipment, so I shot him an email running your question and 1000 microns at 180/200C parameters by him. I'll pass on what he says.
I do know that Horatio was using a rotovape for azeotrope removal, which 1000 microns would be adequate for.
The guru that I go to for rotovape processes, is Michael Bishop of Heidolph, whom is bright, knowledgeable, personable, and helpful.
He can be contacted at
[email protected]. He is also intimately familiar with our industry, so I recommend you also pick his fine minds for subtle refinements.
You could of course do it with a chromatography column, but using Hexane sort of negates the advantages of using d Limonene to extract with in the first place.
No other suggestions............