| 摘要 |
PROBLEM TO BE SOLVED: To obtain ε-caprolactam in high yield by Beckmann rearrangement of cyclohexanoxime using [B] β-zeolite in a vapor phase within a specific temperature range. SOLUTION: This ε-caprolactam is obtained by Beckmann rearrangement of cyclohexanoxime using [B]β-zeolite as zeolite catalyst in a vapor phase at 250-450 deg.C. The [B] β-zeolite is prepared by agitating an aqueous mixture of H3 BO3 , an alkali metal hydroxide, silicon component, and advantageously microgranular, optionally precipitated silicic acid together with an amine solution, esp. tetraethylammonium hydroxide and/or bromide, under a spontaneously generated pressure, the product is then washed and dried to afford a crystal form which is then dried at <=400 deg.C in an ammonia gas flow to convert to an ammonia form; The [B]β-zeolite thus prepared may be exposed to a temperature of 500-600 deg.C and, as necessary, molded, using a binder, into catalyst pellets of common use. |
