32results about How to "Strong anti-coking performance" patented technology

The invention relates to a catalyst for preparing butadiene by selective hydrogenation of carbon tetrayne and a preparation method and application. The catalyst includes ZrO 2 / CdO / Bi 2 O 3 A composite carrier and an active component, the active component consists of: at least one of Pd or its oxide, VIIB metal or its oxide, La or its oxide. The catalyst of the invention can be used in the application of the selective hydrogenation of carbon tetraacetylene to recover butadiene, and mainly solves the problems of poor catalyst stability, short life, poor alkyne selectivity and excessive butadiene loss in the prior art.

The present invention discloses a catalyst system used for acetic acid and acetic anhydride synthesis and the application. Halide of rhodium is used for active specie of a catalyst and alkyl halide, alkali metal iodine and organic solvent are used as the catalyst. Caffeine is used as a ligand. The mass proportion of the caffeine and the halide of the rhodium is one till thirty to one. The catalyst system provided by the present invention has the advantage of good compatibility. The hard removing problems of the wall attachment, the falling to the bottom and the coking of the catalyst are not easy to happen in carbonylation reaction equipment. And the present invention has the advantages of high catalytic activity, high selectivity, high thermal stability and strong anti-coking performance. Any complex pretreatment before the catalysis is not needed. The formation of the catalyst system is simple and rapid. The catalyst process is simple and easy to be implemented. And the present invention also has the advantages of high catalytic activity, high stability, good compatibility, low cost, etc.

The invention provides a selective hydrogenation method for pyrolysis gasoline, wherein an isothermal fixed bed reactor is adopted, the reactor is provided with a Pd-Mo series hydrogenation catalyst,and the hydrogenation process conditions are: reaction temperature is 50-100 DEG C, reaction pressure is 3-7 MPa, sapce velocity is 1-5h<-1>, and the volume ratio of hydrogen to oil is (100-600):1; ahydrogenation product is sent to the second-stage hydrogenation reactor for hydrorefining; Pd-Mo series hydrogenation catalysts prepared by using a nickel-containing alumina carrier having a specificcrystalline form prepared by the selective hydrogenation method for the pyrolysis gasoline can greatly improve the dispersion and utilization ratio of active metal, and active components are added toplay synergistic effects to improve hydrogenation activity and stability of the catalysts.

The invention provides a selective hydrogenation method for pyrolysis gasoline. A single-stage adiabatic fixed-bed reactor is adopted, and the reactor is provided with a Pd-Mo-based hydrogenation catalyst. The hydrogenation process conditions are as follows: reaction temperature 30-120 DEG C, reaction pressure 2-6 MPa, airspeed 0.5-4h-1, hydrogen-to-oil volume ratio (100-600):1. One part of the hydrogenation product is used as the inner cycle of a one-stage hydrogenation reaction, and the other part is sent to a second-stage hydrogenation reactor for hydrorefining. The catalyst having a specific crystal form prepared by using a nickel-containing alumina carrier in the invention can greatly improve the dispersion and utilization rate of active metals, and the addition of selected auxiliaryactive components which are added plays a synergistic role to improve the hydrogenation activity and stability of the catalyst.

The invention relates to a prehydrogenation treatment for a carbon-4 alkylation raw material. According to the prehydrogenation treatment method, a palladium-molybdenum series catalyst and a fixed bedreactor are utilized; hydrogenation process conditions are that a reaction temperature is 30 to 75 DEG C, reaction pressure is 1 to 3MPa, a liquid space velocity is 2 to 10h<-1>, and a molar ratio ofhydrogen to butadiene is 1 to 10; the palladium-molybdenum series catalyst is prepared from an aluminum oxide carrier containing nickel with a specific crystal form, so that the catalyst has appropriate acidity and a higher reactive metal utilization rate, and butadiene hydrogenation activity and selectivity of the catalyst are remarkably improved. By means of the hydrogenation treatment method disclosed by the invention, a carbon-4 alkylation raw material pretreatment device can effectively remove impurity butadiene at a higher feeding space velocity under the situation that monoolefine in ahydrogenation product is fundamentally not lost; thus, very obvious and good effects of improving environmental benefits and economic benefits of a follow-up alkylation device are achieved.