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I want to relocate my kitchen sink to an inside wall from the outside wall. The vent pipe is currently in the outside wall. Can I run the vent pipe across the ceiling between the rafters ,the rafters run in the direction same direction the vent would go The walls are 11 feet apart.

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Does your jurisdiction allow Air-Admittance Valves (aka AAVs or Studor vents)? If it does, this would eliminate the need for an external vent.

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There's no problem running a vent pipe horizontally, as long as the pipe has a slope that allows it to drain back to the drainpipe by gravity (IPC 905.2). So for an 11' run, make sure the vent end of the pipe is 2 3/4" higher than the drain end (1/4" per foot).

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