Method for preparing TS-1 molecular sieve with hierarchical pores

A method for preparing a hierarchical porous TS-1 molecular sieve comprising using a silicon-titanium ester polymer as both titanium source and silicon source;

• the method for preparing the silicon-titanium ester polymer comprises mixing silicate, titanate, and polyhydric alcohol, and then performing a reaction under stirring conditions and in an inactive atmosphere, wherein the reaction temperature ranges from 80 to 180° C. and the reaction time ranges from 2 to 10 hours;
• wherein a molar ratio of the silicate, titanate and polyhydric alcohol satisfies:
• titanate:silicate=0.001−0.2;
• (titanate+silicate):polyhydric alcohol=(0.5−5)x;
• 4;
• wherein, x is the number of moles of hydroxyl groups contained in each mole of the polyhydric alcohol;
• and
• the number of moles of each component is calculated by the number of moles of the substance itself;
• wherein the polyhydric alcohol comprises at least one of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propanediol, 1,3propanediol, 1,4-butylene glycol, 1,6-hexanediol, polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, polyethylene glycol 800, 1,4-cyclohexanediol, 1,4-cyclohexane dimethanol, terephthalyl alcohol, glycerin, trimethylolpropane, pentaerythritol, xylitol and sorbitol;
• wherein the reaction further comprises performing vacuum distillation, wherein conditions of the vacuum distillation comprise that a vacuum degree ranges from 0.01 to 5 kPa, a vacuum distillation temperature ranges from 170 to 230° C., and a vacuum distillation time ranges from 0.5 to 5 hours.