A process for the preparation of mixed oxybate salts and polymorphs thereof

A process for preparing a mixed oxybate salt or a polymorph thereof, wherein the process comprises:

• (i). mixing at least one oxybate in a solvent and stirring at a temperature range from 0-30° C. to obtain a reaction mixture, wherein, at least one oxybate is selected from sodium oxybate, potassium oxybate, magnesium oxybate, or calcium oxybate;
• (ii). filtering the reaction mixture followed by washing with the solvent to obtain the mixed oxybate salt or the polymorph thereof;
• and
• wherein, the mixed oxybate salt or the polymorph thereof comprises at least one or a combination of a sodium oxybate or a polymorph thereof present in an amount of 8±0.5% by wt., potassium oxybate or a polymorph thereof present in an amount of 26±0.5% by wt., magnesium oxybate or a polymorph thereof present in an amount of 19.2±0.5% by wt., or calcium oxybate or a polymorph thereof is present in an amount of 46.8±0.5% by wt.