[Rishi]

I am trying to make alkoxides from NaOH and alcohols (Methanol, Ethanol and Isopropanol).

What would be the most convinient method ? Pervaporation or the synthesis in vapor phase.

If pervaporation can work. Could you kindly suggest he membranes and the temperature and pressure ranges.

Looking to hear from you.

with regards

[cth]

Actually, you can buy most suppliers. 

If I had to prepare them anyway, I would either use sodium metal or sodium hydride (NaH) into methanol, ethanol and isopropanol solutions.
But, be very careful. These reactions are exothermic and produce H₂ gas which can catch fire. Then your entire solution would be in fire... Add the reactant very slowly and cool the solution using a water/ice bath.
Once done, evaporate the unreacted solvent to dryness and there you are.

[Rishi]

Hi,

I am preparing the alkoxides by dissolving sodium metal in alcohol. But the cost of sodium metal compared to NaOH is too high and hence teh product derived from Sodium metal is costlier and hence making it commercially non-viable.

Could you suggest a better way to removie water from the reaction of NaOH and methanol. I think that NaOH has a lypophilic property and hence water removal might not be that easy.

Can pervaporation be helpful ? What membranes can be used. Looking forward to hear from you.

[cth]

Sorry, but I don't know what kind of membrane you could use. And I don't know how they are prepared industrially. 
I have always worked at the university and I know very little about the chemical industry processes.