40results about How to "Improve acid properties" patented technology

The invention provides a ZSM-5 / ZSM-12 composite molecular sieve. The ZSM-5 / ZSM-12 composite molecular sieve has the following two crystal forms at the same time: a ZSM-12 molecular sieve and a ZSM-5 molecular sieve. The synthetic method for the ZSM-5 / ZSM-12 composite molecular sieve provided by the invention comprises the following steps: adding the ZSM-12 molecular sieve into a glucose solution for ultrasonic treatment and carrying out filtering, drying and roasting so as to obtain a treated ZSM-12 molecular sieve; then mixing water, an alkali source, a template agent, an aluminum source and a silicon source and carrying out crystallization so as to prepare pre-crystallized colloid; then mixing the pre-crystallized colloid with the treated ZSM-12 molecular sieve and carrying out crystallization at a temperature of 160 to 220 DEG C for 5 to 25 h so as to obtain the ZSM-5 / ZSM-12 composite molecular sieve. According to the invention, glucose is introduced into the pores of the ZSM-12 molecular sieve and becomes carbon after roasting; the carbon occupies the pore channels of the ZSM-12 molecular sieve to prevent alkali from entering the interior of ZSM-12 molecular sieve crystals, so the ZSM-12 molecular sieve is not destroyed in the process of crystallization and the integrity of crystal structure is maintained, which are beneficial for improvement of the physical and chemical properties and the catalytic activity of the ZSM-5 / ZSM-12 composite molecular sieve.

A method for the selective hydrogenation of alkynes, using the C4 fraction rich in alkynes after the extraction of butadiene as a raw material, in the presence of a catalyst, using an adiabatic reactor to selectively hydrogenate to obtain 1,3-butane Alkene, the operating conditions of the process are as follows: the reaction inlet temperature is 20-60°C, the reaction pressure is 1.0-3.0MPa, and the liquid space velocity is 8-20h-1. The catalyst is a palladium-lead catalyst supported on niobium oxide-alumina. Adopting the method of the invention has very obvious good effects on the effective utilization of the C4 fraction rich in alkynes after the extraction of butadiene, the reduction of waste of resources and the improvement of economic benefits.

The invention discloses a heavy aromatic conversion catalyst. The heavy aromatic conversion catalyst comprises small-particle hydrogen mordenite in a two-dimensional sheet state, the size of the small-particle hydrogen mordenite in the long-dimensional direction is 200-1000 nm, the sheet thickness of the small-particle hydrogen mordenite in the short-dimensional direction is 5-60 nm, the pyridineabsorption infrared total acid of the small-particle hydrogen mordenite is 0.5-1.35 mmol / g, and the B acid distribution of the small-particle hydrogen mordenite is 45-70%. The preparation method of the heavy aromatic conversion catalyst comprises (1) uniformly mixing a silicon source, an alkali source, N-methylpiperidine and water, performing hydro-thermal treatment on the mixed materials in a sealed state, cooling the materials down to room temperature, and then uniformly mixing an aluminum source into the hydro-thermal-treated materials; (2) aging, crystallizing, washing, drying and baking the materials obtained in the step (1), fully soaking the baked powder in an organic acid-inorganic ammonium salt aqueous solution, and performing drying, baking and forming process to obtain the heavyaromatic conversion catalyst. The heavy aromatic conversion catalyst is high in heavy aromatic conversion ability and BTX (benzene-toluene-xylene) yield.

The invention relates to an ETS-10 titanium silicalite molecular sieve modification method. The ETS-10 titanium silicalite molecular sieve modification method provided by the invention comprises the following steps: alkali treatment modification: carrying out alkali treatment modification of EST-10 titanium silicalite molecular sieve raw powder through adopting an alkaline solution, filtering, washing, and drying to obtain alkali treatment modified ETS-10 titanium silicalite molecular sieve; and realuminated modification treatment: carrying out realuminated modification treatment of the alkali treatment modified ETS-10 titanium silicalite molecular sieve through adopting an aluminum salt solution or an aluminate solution, filtering, washing, drying, and roasting to obtain the alkali treatment modification and realuminated modification treated ETS-10 titanium silicalite molecular sieve. The modification method provided by the invention adopts the alkali treatment modification and the realuminated modification treatment of the EST-10 titanium silicalite molecular sieve raw powder to be carried out, so the surface phase of the EST-10 titanium silicalite molecular sieve is rich in titanium and aluminum, abundant meso-structures are introduced, and the skeletal acidity is improved.

A method for selective hydrogenation of carbon four fractions. The material to be hydrogenated and H2 enter the first-stage isothermal reactor, and the material after the first-stage reaction enters the second-stage adiabatic reactor. The reactor is loaded with a selective hydrogenation catalyst, and the reaction product enters the gas-liquid after cooling Separation tank for separation; the selective hydrogenation catalyst loaded in the first-stage isothermal reactor is the same or different from the selective hydrogenation catalyst loaded in the second-stage adiabatic reactor, and at least one reactor is loaded with alumina and Selective hydrogenation catalysts on niobium oxide composite supports. Adopting the method of the invention has very obvious good effects on the effective utilization of the C4 fraction rich in alkynes after the extraction of butadiene, the reduction of waste of resources and the improvement of economic benefits.

A method of recycling butadiene through selective hydrogenation of alkynes includes the steps of: with a C4 fraction being rich in the alkynes from extraction of butadiene as a raw material, performing selective hydrogenation in the presence of a catalyst in an isothermal reactor to prepare 1,3-butadiene, wherein operation conditions of the process include: reaction temperature is 30-80 DEG C, reaction pressure is 1.0-3.0 MPa, liquid space velocity is 7-18 / h, and the catalyst is a Pd / Pb catalyst with a niobium oxide / alumina carrier. The method has advantages of effectively utilizing the C4 fraction being rich in the the alkynes from extraction of the butadiene, reducing resource waste and improving economic benefit.

The invention provides a Beta-Y composite molecular sieve. The Beta-Y composite molecular sieve has the following two crystal forms at the same time: a Y type molecular sieve and a Beta molecular sieve. The invention also provides a synthetic method for the Beta-Y composite molecule sieve. The synthetic method comprises the following steps: (1) preparing a Y structure-directing agent; (2) adding the Beta molecular sieve into a glucose solution for pretreatment; (3) mixing a silicon source, an aluminum source, inorganic base and water and adding the Y structure-directing agent; and (4) adding the treated Beta molecular sieve under stirring, carrying out crystallization and then carrying out separating, washing, drying and roasting so as to obtain the Beta-Y composite molecular sieve. According to the invention, glucose is introduced into the micro pore channels of the Beta molecular sieve and becomes carbon after roasting; the carbon occupies the pore channels of the Beta molecular sieve to prevent alkali from entering the interior of Beta molecular sieve crystals, so the Beta molecular sieve is not destroyed in the process of crystallization and the integrity of crystal structure is maintained, which are beneficial for improvement of the physical and chemical properties and the catalytic activity of the Beta-Y composite molecular sieve.

The invention provides a Y / ZSM-35 composite molecular sieve with two crystal forms of a Y type molecular sieve and a ZSM-35 molecular sieve. The invention also provides a synthesizing method of the Y / ZSM-35 composite molecular sieve. The method comprises the following steps: (1) a Y structure-directing agent is prepared; (2) a ZSM-35 molecular sieve is added into a glucose solution and is subjected to pretreatment; (3) a silicon source, an aluminum source, an alkali source, water, the Y structure-directing agent and the treated ZSM-35 molecular sieve are mixed; and crystallization is carried out, such that the Y / ZSM-35 composite molecular sieve is obtained. According to the invention, glucose is introduced into micro-pore channels of the ZSM-35 molecular sieve, and is converted into carbon through roasting, such that the channels of the ZSM-35 molecular sieve are occupied, and alkali is prevented from entering the crystals of the ZSM-35 molecular sieve. Therefore, the ZSM-35 molecular sieve is not damaged during the crystallization reaction process, crystal structure integrity is maintained, and the physical and chemical properties and the catalytic activity of the Y / ZSM-35 composite molecular sieve can be improved.