122results about How to "Reduce carbon deposition rate" patented technology

The invention discloses a catalytic cracking coupling process for preparing low-carbon olefin and C<5+> hydrocarbon by using an organic oxygen-containing compound. The catalytic cracking coupling process comprises the following steps: converting the organic oxygen-containing compound into the low-carbon olefin under the effect of a catalyst in a reactor for preparing the low-carbon olefin by the organic oxygen-containing compound; in a catalyst regenerator, heating for oxidizing and decarbonizing a waste catalyst which enters the catalyst regenerator through a waste catalyst conveying pipeline from the reactor so as to regenerate a regenerated catalyst; conveying the regenerated catalyst back into the reactor by a regenerated catalyst conveying pipeline; introducing the C<5+> hydrocarbon into the regenerated catalyst conveying pipeline; under the catalytic effect of the catalyst, catalytically cracking the C<5+> hydrocarbon into the low-carbon olefin; and conveying the generated low-carbon olefin and the regenerated catalyst into the reactor by the regenerated catalyst conveying pipeline. According to the process disclosed by the invention, the high temperature of the regenerated catalyst is effectively utilized and the C<5+> hydrocarbon is cracked into the low-carbon olefin to form active hydrocarbon tank species, so as to shorten a reaction induction period, reduce the selectivity of converting the organic oxygen-containing compound into active carbon tank species and improve the yield of the low-carbon olefin.

This invention relates to a preparation method for dimethyl ether by dehydrating methanol under liquid phase or gas-liquid mixing state in a catalytic distillation tower loaded with a solid acid catalyst in reaction section, wherein the methanol has a content of 5~99.99 wt.%. Catalytic distillation tower operating conditions include pressure of 0.6~5.0 MPa, column top temperature of 30~124DEG C, reaction section central temperature of 120~220DEG C, column reactor temperature of 160~270DEG C, the reflux ratio at 3~50, and feed volume space velocity of 0.1-10 ml methanol / ml catalyst, Or the reactions are carried out in one fixed bed rector or 2~4 fixed bed reactors in series with reaction conditions of temperature 120~220DEG C, pressure 0.6~8.0 MPa, and feed volume space velocity 0.1-10 ml methanol / ml catalyst.

The present invention discloses a jet fuel production method, which comprises that (1) hydrogen gas, raw material oil and a hydrorefining catalyst are subjected to a contact reaction; (3) the effluent of the hydrorefining catalyst and a hydrocracking catalyst are directly subjected to a contact reaction, or after the gas phase stream is separated, a contact reaction is performed with a hydrocracking catalyst; (4) the effluent of the hydrocracking catalyst is separated to obtain a jet fuel and diesel oil; and (5) at least partial diesel oil and the raw material oil are mixed, or at least partial diesel oil and the feeding liquid of the hydrocracking catalyst are mixed, wherein the aromatic hydrocarbon content of the raw material oil is more than or equal to 40 wt%, the contact reaction condition of the step (1) makes the bicyclic aromatic hydrocarbon saturation rate in the raw material oil be 70-90%, and the contact reaction conditions of the step (3) makes the monocyclic aromatic hydrocarbon saturation rate in the feeding liquid of the step (3) be 75-95%. According to the present invention, the catalytic cracking diesel oil can be used as the raw material so as to achieve the high yield production of the high density jet fuel meeting the GJB1603 6# jet fuel standard.

The present invention relates to an aromatic olefin-reducing catalyst mainly solving the problems of short carclazyte life, frequent replacement, large labor intensity, and serious environmental pollution when the carclazyte is used for removing trace olefins in an aromatic material in current industry. The aromatic olefin-reducing catalyst is used, the average pore diameter of the aromatic olefin-reducing catalyst is 5-30nm, the aromatic olefin-reducing catalyst comprises the following components by weight: 0 to 15% of lanthanide elements or a mixture thereof; 0 to 20% of oxides of one or more elements selected from Ca, Zn , Mg and Ti; and 30 to 90% of a molecular sieve, the molecular sieve is at least one selected from mordenite, Y zeolite, ZSM-5 molecular sieve, MCM-22 molecular sieve, MCM-56 molecular sieve, and beta-molecular sieve; and a carrier is one substance selected from alumina and silica or a mixture thereof, and by the technical scheme, the problem is preferably solved, and the method can be used for aromatic olefin-reducing industrial production.

A preparation method of a polymetallic reforming catalyst comprises the following steps: allowing platinum, tin and rare earth metal uniformly-supported small catalyst spheres to be in solid contact with rare earth metal salt powder, and roasting the obtained mixture in air or water-containing air to obtain a reforming catalyst with rare earth metals enriched in the shell area of the catalyst, wherein the average content of rare earth metals in the shell area is 2-5 times the average content of rare earth metals in a center area, the catalyst shell area is an area from the outer edge of the small catalyst sphere to the center and with the thickness of 150[mu]m, the solid phase supported catalyst comprises an alumina carrier, platinum accounting for 0.1-2.0% of the mass of the alumina carrier, tin accounting for 0.1-2.0% of the mass of the alumina carrier, rare earth metals accounting for 0.05-1.0% of the mass of the alumina carrier, and chlorine accounting for 0.5-5.0% of the mass of the alumina carrier. The catalyst prepared through the method has good activity and stability and low carbon depositing rate in reforming reactions.

The invention discloses a naphtha reforming catalyst, and a preparation method thereof. The naphtha reforming catalyst comprises, by mass, 93.0 to 99.9 parts of a carrier, 0.1 to 2.0 parts of a metal, 0 to 5.0 parts of carbon, wherein the mass amount of carbon is higher than 0. According to the preparation method, a certain amount of a monosaccharide is added in preparation process of the Pt-KL reforming catalyst, so that metal Pt dispersion is improved, carbon deposition rate of the catalyst in reaction process is reduced, and Pt-KL catalyst reforming reaction performance is improved; the naphtha reforming catalyst possesses relatively high paraffin aromatization reaction activity and reforming liquid yield; when active metal component Pt is introduced in the preparation method, a dipping liquid is alkaline, pH value is controlled to be 10 to 13, adsorption effect of Pt precursor ion with carrier KL molecular sieve is improved, so that it is beneficial for dispersion of metal Pt.