to that of the zsm 11 aluminosilicate zeolites 34 ts 3 34 as described in belgian pat no 1 001 038 34 ts 48 34 having a zsm 48 structure and 34 ts 12 34 having an mtw type structure also suitable for use are the titanium containing molecular sieves having framework structures isomorphous to zeolite beta as well as those materials designated 34 cit 1 34 34 ssz 33 34 34 ets 4 34 34 ets 10 34 and 34 ti mcm 41 34 the titanium containing molecular sieves preferably contain no non oxygen elements other than titanium and silica in the lattice framework although minor amounts of boron iron aluminum and the like may be present titanium containing molecular sieves usable in the present regeneration process are sometimes variously referred to by workers in the field as 34 titanium silicalites 34 34 titanosilicates 34 34 titanium silicates 34 34 silicon titanates 34 and the like the molecular sieve may be admixed with a binder or other matrix material and may be in any physical form such as powder pellets granules blocks or the like supported titanium containing molecular sieves such as titanium silicalite supported on titania silica or the like may also be regenerated in accordance with the invention titanium containing molecular sieves suitable for use in the process of this invention will generally have a composition corresponding to the following empirical formula xtio 2 1 x sio 2 where x is between 0 0001 and 0 500 more preferably the value of x is from 0 01 to 0 125 the molar ratio of si ti in the lattice framework of the titanium containing molecular sieve is advantageously from 9 5 1 to 99 1 most preferably from 9 5.