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

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.

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.