rotation of a cylinder

[Spetsnaz26]

Well... it's just a cylinder, a solid flows inside of it and a chemical reaction takes places, so we need to rotate the cylinder to improve conversion yield...long story.

but...here comes the question... I have seen people (non-natives, like me, usually like to made up some words based on their mother-tongues, no offense to others, please) use these adjectives to describe such cylinder (or reactor, if you will):

rotatory
rotative
rotary
rotating

They are all right, but I am not sure which one is more appropiate, all I want is to make it sound natural.

Thanks for your time.

From my humble experience with technical English, I would say the last two are the most common, and thus natural ones. Rotatory may exist but rotative looks wierd and you only need the last two anyway.

In your case, (although I've forgotten all my highschool chemistry, I do have a hard time imagine how a 'solid' flows?) this container contraption has to rotate throughout the duration as long as you're messing with this 'solid', which makes it a 'rotating cylinder'. 'rotary' would sound like this thing is capable of rotating but there's no indication when and for what reason it rotates or not. So I would suggest 'rotating cylinder'.

Again, English is my second language and teaching English has never been my profession.

[Offroad]

'rotating' it is.