摘要:
An improved olefin upgrading technique and fixed-bed reactor system has been developed for increasing production of premium heavy hydrocarbons, such as distillate fuel, from lower olefinic feedstock. During recovery and recycle of intermediate range hydrocarbons products, a technique has been found for withdrawing a fraction rich in C.sub.5 -C.sub.9 gasoline range olefinic hydrocarbons from the oligomerization reactor effluent stream. By separating the reaction effluent in a multi-stage distillation system, fractionation feed can be separated into a heavier bottoms stream rich in C.sub.10 + hydrocarbons and a light hydrocarbon overhead, while withdrawing a liquid stream as an overflash fractionation stream rich in intermediate hydrocarbons. The overflash stream is combined to form a portion of the recycle stream to the reactor, thereby providing a more efficient and lower cost recovery process.
摘要:
Thermal cracking in a riser cracking, closed cyclone, fluidized catalytic cracking process is reduced. A snorkel or flow conduit having an inlet just above the catalyst stripper moves stripper vapor into the closed cyclone. The system preferably operates without a stripper cap, relying on fluid dynamics to isolate stripper vapor from upper parts of the vessel containing the riser outlet. Preferably the snorkel is at least partially supported by, and ideally is inside, the primary cyclone dipleg. Reduced residence time of stripper vapor in the vessel containing the stripper and the closed cyclone system reduces thermal cracking of stripper vapor.
摘要:
Crystalline materials having increased mechanical strength and improved chemical properties are provided by incorporating carbonate by contact treatment with carbon dioxide (CO.sub.2) to modify the alkaline earth oxide morphology. Alkaline earth-containing particulate solids are stabilized in the crystalline oxide structure, preferrably with dense phase or supercritical CO.sub.2. Typical industrial applications include particulate contact solids, catalysts, binders and monolithic structures.
摘要:
A low sulfur gasoline of relatively high octane number is produced from a catalytically cracked, sulfur-containing naphtha by hydrodesulfurization followed by octane enhancing treatment in a fluidized bed catalytic process, in the presence of an aromatics-rich feedstream. The process converts the hydrodesulfurized intermediate and the aromatics-rich feedstream to a gasoline boiling range fraction of high octane number. The fluidized bed catalytic process is carried out over zeolite catalyst particles in a turbulent reactor bed at a temperature of about 600.degree. to 800.degree. F. (316.degree. to 427.degree. C.) and pressure of about 100 to 250 psig (790 to 825 kPa. The catalyst has an apparent particle density of about 0.9 to 1.6 g/cm.sup.3 and a size range of about 1 to 150 microns, and average catalyst particle size of about 20 to 100 microns containing about 10 to 25 weight percent of fine particles having a particle size less than 32 microns. The feed vapor is passed upwardly through the fluidized catalyst bed under turbulent flow conditions; turbulent fluidized bed conditions are maintained through the reactor bed between transition velocity and transport velocity at a superficial fluid velocity of about 0.3 to 2 meters per second. Treatment in the fluidized bed catalytic process restores the octane loss which takes place as a result of the hydrogenative treatment and results in a low sulfur gasoline product with an octane number comparable to that of the feed naphtha.
摘要翻译:通过加氢脱硫,然后在富含芳烃的进料流存在下,在流化床催化方法中进行辛烷值增强处理,由催化裂解的含硫石脑油产生相对高辛烷值的低硫汽油。 该方法将加氢脱硫中间体和富含芳烃的进料流转化为高辛烷值的汽油沸程。 流化床催化过程在湍流反应器床中在沸点催化剂颗粒上进行,温度为约600至800°F(316至427℃),压力为约100至250psig(790至825 催化剂具有约0.9至1.6g / cm 3的表观颗粒密度和约1至150微米的尺寸范围,并且约20至100微米的平均催化剂颗粒尺寸含有约10至25重量%的具有 进料蒸气在湍流条件下向上通过流化催化剂床;湍流流化床条件通过反应器床保持在过渡速度和输送速度之间,表面流体速度约为0.3至2 流化床催化过程中的处理恢复了由于氢化处理而发生的辛烷值损失,导致低硫汽油产物与 辛烷值与进料石脑油相当。
摘要:
A method and system for cracking hydrocarbons and regeneration of the catalyst is described with particular emphasis directed to partially restoring the activity of the catalyst after an initial hydrocarbon conversion use by heat soaking the catalyst at an elevated temperature before use in a second hydrocarbon conversion zone.This case is a division of application Ser. No. 595,833, filed Jul. 14, 1975.
摘要:
A process for multi-stage catalytic cracking is disclosed. A first stage cracks a first feed at atmospheric to 100 psig over a shape selective zeolite to convert from 10 to 90%, by volume, to lighter products rich in iso-compounds which may be used to make ethers. A second feed, which may include 700.degree. F.+ liquid from the selective cracking reaction, is cracked in a catalytic cracking (FCC) unit. Preferably all or some of the products from the shape selective cracking reactor are fractionated in the FCC main column.
摘要:
A multistage catalytic reactor system for preparing ethers such as methyl t-butyl (MTBE) and t-amyl methyl ether (TAME) from iso-olefin and methanol, comprising a first reactor for contacting the iso-olefin and alcohol with a solid regenerable catalyst, such as medium-pore zeolite conversion catalyst for partial conversion of the iso-olefin and methanol to an unsymmetrical ether, operatively connected for feeding effluent from the first reactor to a second etherification reaction zone containing sensitive catalyst, such as macroreticular polystyrenesulfonic acid resin. In a preferred embodiment, the second reaction zone comprises an inlet means for receiving withdrawn intermediate product, a catalytic distillation column containing solid acid resin etherification catalyst in a plurality of fixed bed catalysis-distillation zones, and outlet means for withdrawing a final etherification product.
摘要:
A technique for converting olefinic light hydrocarbons rich in butenes and butanes to ether-rich liquid fuels including etherification and transhydrogenation operations. The preferred process includes: reacting a mixed C4 hydrocarbon stream containing isobutene and n-butenes with lower aliphatic alcohol in an etherification zone in contact with an acidic etherification catalyst under etherification conditions whereby an effluent stream containing C5+ tertiary-alkyl ether is produced; separating the etherification effluent stream to provide a liquid stream comprising C5+ ether and an olefinic stream comprising unreacted C4 hydrocarbons; contacting at least the n-butenes from the C.sub.4 olefinic hydrocarbon stream with isobutane under transhydrogenation conditions in the presence of transhydrogenation catalyst whereby isobutane is converted to isobutene; separating transhydrogenation effluent to recover a C4 olefinic intermediate stream containing isobutene; and passing at least a portion of the isobutene-containing intermediate stream to the etherification zone for conversion to tertiary-alkyl ether.
摘要:
A process and apparatus are disclosed for achieving turbulent or fast fluidized bed regeneration of spent FCC catalyst in a bubbling bed regenerator having a stripper mounted over the regenerator and a stripped catalyst standpipe within the regenerator. A closed coke combustor vessel is added alongside an existing regenerator vessel, and spent catalyst is discharged into a transfer pot beneath the existing dense bed, then into the coke combustor. Catalyst is regenerated in a turbulent or fast fluidized bed, and discharged into the dilute phase region above the existing bubbling dense bed. The discharge line preferably encompasses, and is in a heat exchange relationship with, the spent catalyst standpipe. Discharged catalyst is collected in the bubbling dense bed surrounding the coke combustor, and may be given an additional stage of regeneration. Catalyst may be recycled from the dense bed to the transfer pot.
摘要:
Improved process techniques and equipment for reacting crude aqueous ethanol feedstock with iso-olefinic hydrocarbons to produce C.sub.6.sup.+ ethyl t-alkyl ethers, which comprises: distilling the aqueous ethanol feedstock; contacting ethanol rich distillate overhead containing a minor amount of water with a liquid hydrocarbon extractant rich in C.sub.4.sup.+ isoalkene under liquid extraction conditions; recovering an aqueous phase containing water introduced from the overhead; recovering an organic extract phase comprising the hydrocarbon extractant and a major amount of ethanol introduced in the feedstock; and reacting the extracted ethanol and C.sub.4.sup.+ isoalkene in contact with an acid etherification catalyst under catalytic reaction conditions to produce ether product.