TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The vanadium-containing catalyst is vanadium pentoxide, vanadium trioxide, vanadium oxide, vanadium(II) oxide, vanadium acetylacetonate, sodium ammonium vanadate, disodium ammonium vanadate, vanadium trichloride, vanadium tetrachloride, vanadium tribromide, cerium ortho-vanadate or vanadium oxides of formulae VO2A, VOB12, VOE3, M1VO3, M23VO4 or M34V2O7. The quaternary ammonium catalyst is of formula ((R1)(R4)(R3)N(+)-(R2) X-). The quaternary ammonium catalyst is dioctyl dimethyl ammonium chloride, didecyl dimethyl ammonium chloride, distearyl dimethyl ammonium chloride, docosyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, octadecyltrimethylammonium chloride, benzylstearyldimethylammonium chloride, methyl tributyl ammonium chloride, methyl trioctyl ammonium chloride, methyl trinonyl ammonium chloride, methyl tridecyl ammonium chloride, tetraoctylammonium chloride, tetra-nonyl ammonium chloride, tetra-decyl ammonium chloride, trioctyl ammonium chloride, methyl tri-dodecyl ammonium chloride, methyl tri-tetradecyl ammonium chloride, methyl tri-cetyl ammonium chloride, methyl tri-octadecyl ammonium chloride, trioctyl methyl ammonium nitrate, tri-octyl methyl ammonium hydrogen sulfate, tri-octyl methyl ammonium chloride, tri-octyl-methyl ammonium hydroxide, tri-octyl methyl ammonium dihydrogen phosphate, tri-octyl-methyl ammonium acetate, tri-octyl methyl ammonium carbonate, tri-octyl methyl ammonium bicarbonate, tri-octyl methyl ammonium mesylate or trioctyl methyl ammonium triflate. The solid granule is tetrafluoroethylene granule, ceramic granule, sand, iron sand or stainless steel bead with a diameter of 0.01-10 cm.A = NO3, Cl, Br, F, I, ClO4, IO3, HCO2 or CH3CO2;B1 = NO3, (SO4)1/2, Cl, Br, F, ClO4, CH3CO2 or C6H5CO2;E = NO3, Cl, Br, F, CH3O, CH3CH2O, CH3(CH3)CHO, (CH3)3CO or CH3CO2;M1 = H, K, Na, Li, Bi1/3, Ca1/2, Mg1/2 or NH4;M2 = H, K, Na, Li or NH4;M3 = H, K, Na, Li, NH4, Mg1/2 or Ca1/2;R1-R4 = alkyl or aralkyl, where the sum of carbon atoms in R1-R4 is 20-55; andX = NO3, (SO4)1/2, HSO4, Cl, Br, F, I, OH, (CO3)1/2, HCO3, HCO2, CH3CO2, (PO4)1/3, (HPO4)1/2, H2PO4, ClO4, IO4, ClO3, BrO3, IO3, CH3SO3, C6H5SO3, CH3C6H4SO3 or CF3SO3.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The post-treatment comprises: pouring the aqueous layer, extracting the residue with a non-polar organic solvent, concentrating and recovering the non-polar organic solvent from the extracted solution, re-crystallizing the extract to prepare (I). The poured aqueous layer, recovered non-polar organic solvent and mother solution of re-crystallizing the extract are recyclable. The mechanical stirring is paddle-type or anchor-type mechanical stirring, or paddle-type or anchor-type mechanical stirring in cooperation with solid granules. Preferred Components: (I) is dehydropregnenolone acetate, 3- beta -acetoxy-5- alpha -pregn-16(17)-ene-20-one, 3- beta -acetoxy-5- beta -pregn-16(17)-ene-20-one or 3- beta -acetoxy-5- alpha -pregna-9(11),16(17)-diene-20-one. (II) is diosgenin acetate, pseudo-diosgenin acetate, pseudo-sarsasapogenin acetate or 9(11)-dehydrogenated pseudosisalagenin acetate.