Solved
Or not.
I have this issue with recent pymods (without alienlife) + angels + bobs.
I think the problem is in "sulfur-processing" tech which requied to unlock nitrobenzene in pyhightech mod.
When I changed this tech to another in pyhightech_1.7.6\prototypes\fluids\nitrobenzene.lua the recipe appeared in FNEI.
I changed line 15 in nitrobenzene.lua:
}:add_unlock("sulfur-processing")
to:
}:add_unlock("basic-electronics")
And after reloading the game the recipe appeared in FNEI (but it is unlocked in another tech of course)
This is a temporary fix. I think it will be good if kingarthur will make so that nitrobenzene is still craftable even if angels petrochem is present. (I heard somewhere that angels petrochem overrides sulfur-processing tech)
Also thank you kingarthur, you are doing great work.