Process for producing cyclohexylbenzene
A cyclohexylbenzene and process technology, which is applied in the field of preparation of cyclohexylbenzene, can solve the problem of expensive recovery of feed materials, and achieve the effect of high selectivity and high yield
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[0073] Example 1: Catalyst preparation
[0074] The catalyst was prepared by pelletizing the Pd catalyst and MCM-49 catalyst together. The Pd catalyst was prepared by impregnating 5 grams of gamma alumina with a palladium nitrate solution and then calcining the Pd-impregnated alumina at 350° C. in air for 3 hours. The amount of Pd supported on alumina is 0.3 wt%. The MCM-49 catalyst was prepared by crushing the extrudate with 80wt% MCM-49 and 20wt% alumina into 0.042cm (1 / 60") or finer particles. Then the Pd / Al 2 O 3 Catalyst and crushed MCM-49 / Al 2 O 3 The mixture was mixed in a weight ratio of 1:3, and then pelletized using a hand press at a pressure of 138MPag (20,000 psig) to form a co-pelletized catalyst. Then the catalyst size was determined for the test according to the mesh opening of 0.250mm-0.149mm (60-100 mesh).
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[0075] Example 2: Benzene hydroalkylation
[0076] 8 grams of the catalyst prepared in Example 1 was charged into a stainless steel fixed-bed microreactor. The reactor has an inner diameter of 1.27 cm (1 / 2 inch) and a 0.32 cm (1 / 8 inch) thermowell in the center through the catalyst bed. The catalyst was pretreated with 100cc / min hydrogen at 300°C and 1a tm for 2 hours. After cooling to 155°C in hydrogen, benzene was fed into the reactor through a syringe pump at 60 cc / hr for 1 hour while increasing the reactor pressure to 1034 kPag (150 psig). The benzene feed rate was then reduced to 0.52 WHSV and the hydrogen / benzene molar ratio was adjusted to 1.28. The liquid product is collected in the cold product trap and analyzed offline. The catalyst performance was evaluated by changing four process variables and using different test conditions. Table 2 shows these process variables and their ranges. A total of 36 test conditions were used to study CHB preparation.
[0077] Table ...
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