Preparation method and use of sulfuric acid-modified zeolite molecular sieve

The invention provides a preparation method of a sulfuric acid-modified zeolite molecular sieve. The preparation method comprises the processes of preparing an H-type zeolite molecular sieve and modifying the H-type zeolite molecular sieve, wherein the process of modifying the H-type zeolite molecular sieve comprises the steps of impregnation in sulfuric acid, and calcination. The invention also provides an application of the sulfuric acid-modified zeolite molecular sieve in the synthesis of AHMT. The sulfuric acid-modified zeolite molecular sieve increases the yield of the AHMT to 98% or above from about 93% in the literature, and the regeneration and the indiscriminate application of the catalyst are realized. The modified molecular sieve can eliminate a large amount of hydrogen chloridegas generated in hydrolysis of aluminum trichloride as a catalyst and eliminate an aluminum-containing acidic solution when used as a catalyst to catalyze a Friedel-Crafts acylation reaction, the useamount of the modified mo