摘要:
A process for producing light olefins and aromatics, which comprises reacting a feedstock with a catalytic cracking catalyst in at least two reaction zones, wherein the reaction temperature of at least one reaction zone downstream of the first reaction zone is higher than that of the first reaction zone and its weight hourly space velocity is lower than that of the first reaction zone. The spent catalyst is separated, from the reaction product vapor, regenerated, and then returned to the reactor. The reaction product vapor is separated to obtain the desired products, light olefins and aromatics. This process efficiently produces light olefins such as propylene, ethylene, etc from heavy feedstocks, wherein the yield of propylene exceeds 20% by weight, and produces aromatics such as toluene, xylene, etc at the same time.
摘要:
A process for producing light olefins and aromatics, which comprises reacting a feedstock with a catalytic cracking catalyst in at least two reaction zones, wherein the reaction temperature of at least one reaction zone downstream of the first reaction zone is higher than that of the first reaction zone and its weight hourly space velocity is lower than that of the first reaction zone. The spent catalyst is separated from the reaction product vapor, regenerated and then returned to the reactor. The reaction product vapor is separated to obtain the desired products, light olefins and aromatics. This process efficiently produces light olefins such as propylene, ethylene, etc. from heavy feedstocks, wherein the yield of propylene exceeds 20% by weight, and produces aromatics such as toluene, xylene, etc. at the same time.
摘要:
A catalytic conversion process for producing light olefins with a high yield from petroleum hydrocarbons, which comprises the steps of contacting a pre-heated petroleum hydrocarbons feedstock with a catalyst which comprises phosphorus and transition metal modified silica rich zeolite having a structure of pentasil in a riser or a fluidized bed reactor, and converting under the catalytic conversion conditions to produce reaction effluent and a spent catalyst, separating the resulted reaction effluent and spent catalyst, further separating said reaction effluent into liquid products and gaseous products comprising ethylene and propylene; stripping the spent catalyst by steam; regenerating the stripped catalyst by contacting the spent catalyst with oxygen-containing gas and burning off coke; and recycling the regenerated catalyst to reactor for reuse.
摘要:
A catalytic conversion process for producing light olefins with a high yield from petroleum hydrocarbons, which comprises the steps of contacting a pre-heated petroleum hydrocarbons feedstock with a catalyst which comprises phosphorus and transition metal modified silica rich zeolite having a structure of pentasil in a riser or a fluidized bed reactor, and converting under the catalytic conversion conditions to produce reaction effluent and a spent catalyst, separating the resulted reaction effluent and spent catalyst, further separating said reaction effluent into liquid products and gaseous products comprising ethylene and propylene; stripping the spent catalyst by steam; regenerating the stripped catalyst by contacting the spent catalyst with oxygen-containing gas and burning off coke; and recycling the regenerated catalyst to reactor for reuse.
摘要:
A noble metal-containing titanosilicate material, characterized in that said material is represented with the oxide form of xTiO2.100SiO2.yEOm.zE, wherein x ranges from 0.001 to 50.0; (y+z) ranges from 0.0001 to 20.0 and y/z
摘要:
A noble metal-containing titanosilicate material, characterized in that said material is represented with the oxide form of xTiO2.100SiO2.yEOm.zE, wherein x ranges from 0.001 to 50.0; (y+z) ranges from 0.0001 to 20.0 and y/z
摘要:
A process for catalytic conversion of hydrocarbon feedstock to produce isobutane and isoparaffin-enriched gasoline which comprises two different reactions, the preheated feedstock is contacted with hot regenerated catalyst in the lower part of a reactor with the result that catalytic cracking reaction takes place, and the mixture of vapors and the coke deposited catalyst are up-flowed and enter into a suitable reaction environment with the result that isomerization and hydrogen transfer reaction take place. The produced LPG has an isobutane content of about 20 wt % to about 40 wt % and the produced gasoline contains isoparaffin content of about 30 wt % to about 45 wt % and olefin content of less than 30 wt %. RON and MON of the gasoline are 90˜93 and 80˜84 respectively.
摘要:
The present invention relates to a titanium-silicalite (TS-1) molecular sieve and the method for preparation of the same, wherein each crystallite of said titanium-silicalite molecular sieve has a hollow cavity with a radial length of 5-300 nm. The benzene adsorption capacity of the molecular sieve determined at 25° C. and P/P0=0.10 for 1 hour is at least 70 mg/g; and the method for preparation of said molecular sieve comprises an acid-treatment and then an organic-base treatment of the synthesized TS-1 molecular sieve, or only an organic-base treatment. The TS-1 molecular sieve of the present invention has a relatively high reactivity and activity stability in the catalytic oxidation.
摘要:
A catalytic pyrolysis process for production of ethylene and propylene from heavy hydrocarbons, comprises that heavy hydrocarbons are contacted with a pillared interlayered clay molecular sieve and/or phosphorus and aluminum or magnesium or calcium modified high silica zeolite having a structure of pentasil contained catalysts in a riser or downflow transfer line reactor in the presence of steam and catalytically pyrolysed at a temperature of 650° C. to 750° C. and a pressure of 0.15 to 0.4 MPa for a contact time of 0.2 to 5 seconds, a weight ratio of catalyst to feedstock of 15:1 to 40:1 and a weight ratio of steam to feedstock of 0.3:1 to 1:1. The yields of ethylene and propylene by the present invention are over 18 wt %.
摘要:
A molecular sieve containing composition, which can be applied in catalytic cracking reaction for producing more ethylene and propylene, and its preparation method. The composition contains a pentasil-type molecular sieve having a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 15-60, prepared by activation and modification with phosphorus, alkaline earth metal and transition metal. The composition essentially includes 85.about.98% wt of pentasil-type molecular sieve, 1.about.10% wt of P.sub.2 O.sub.5, 0.3.about.5% wt of alkaline earth oxide, and 0.3.about.5% wt of transition metal oxide. The molecular sieve structure and active centers have high thermal and hydrothermal stability. The salient feature of this composition is that when applied as an active component of cracking catalyst for catalytic pyrolysis process, the yield of ethylene is above 18% and the total yield of ethylene and propylene is more than 40%.
摘要翻译:一种含分子筛的组合物及其制备方法,可用于催化裂化反应生产更多的乙烯和丙烯。 该组合物含有通过用磷,碱土金属和过渡金属的活化和改性制备的SiO 2 / Al 2 O 3摩尔比为15-60的pentasil型分子筛。 该组合物基本上包含85%的pentinil型分子筛98%wt,10%wt的P2O5,0.3%的5%wt的碱土金属氧化物和0.3%的5%wt的过渡金属氧化物。 分子筛结构和活性中心具有较高的热和水热稳定性。 该组合物的显着特点是当作为催化裂解工艺的裂化催化剂的活性组分使用时,乙烯的产率高于18%,乙烯和丙烯的总产率大于40%。