41results about How to "Avoid frequent switching operations" patented technology

The invention discloses a method for producing ethanol by hydrogenating acetic acid. The method is as follows: at a temperature of 250-400°C, a pressure of 0.5-10.0 MPa, a mass space velocity of 0.2-8.0 hours-1, and a feed molar ratio of hydrogen to acetic acid Under the condition of 1:1~20:1, mix acetic acid and hydrogen, contact and react with the supported transition metal carbide catalyst, and hydrogenate acetic acid to produce ethanol; the process of the invention is simple, the price of the catalyst is low, and the performance of the catalyst is stable Well, the stable operation time of the device is long, which can avoid the frequent switching operation of reactor reaction and regeneration, the catalyst can be regenerated, can avoid the post-treatment of a large amount of spent catalyst, and has little impact on the environment.

The invention discloses a method for removing micro-quantity alkene in aromatic hydrocarbon. The method comprises the following steps of: contacting and reacting the aromatic hydrocarbon with a solid acid catalyst under the condition of temperature of 30-350 DEG C, pressure of 0.1-12MPa and feeding quality airspeed of 0.1-15 h<-1>, so that micro-quantity alkene in the aromatic hydrocarbon undergoes adsorbing, overlapping and alkylation reaction so as to remove the micro-quantity alkene in the aromatic hydrocarbon. The method is simple in process procedure, free of oxygen consumption and low in device investment and operation expense; and the catalyst is good in activity stability, the device is long in stable operation time, the aromatic hydrocarbon loss is small, the frequent switching operation between reactor reaction and regeneration is avoided, and the catalyst can be regenerated, so that a great deal of waste catalyst is prevented from being buried, and the environment is less polluted.

The invention discloses a method for removing trace olefins in aromatic hydrocarbons by using a solid acid catalyst. ‑1 Under certain conditions, the liquid-phase aromatics are contacted with a solid acid catalyst, so that the trace olefins in the aromatics undergo alkylation and superimposition reactions, and the trace olefins in the aromatics are removed, thereby refining the aromatics and obtaining aromatics from which olefins have been removed The solid acid catalyst is a mesoporous zirconium phosphate molecular sieve catalyst or a modified mesoporous zirconium phosphate molecular sieve catalyst loaded with a modified compound; the solid acid catalyst prepared by the method of the present invention has high activity, and the removal rate is above 98%; the catalyst The activity stability is good, and the activity stability time exceeds 3000h; the reaction selectivity of aromatic hydrocarbon deolefination is high, C 8 The mass fraction of toluene refined from aromatics is less than 0.1%, which can avoid frequent switching operations of reactor reaction and regeneration.