摘要:
Disclosed herein is a method for separating from the reactor effluent of an olefin oligomerization procedure those catalyst materials and polymeric by-products which can cause difficulties in the downstream processing of such effluent. Polymer by-products and catalyst in the effluent are separated from reaction products by flash vaporization utilizing an in-situ hot solvent which is contacted with the effluent and serves as the heating medium to promote this flash vaporization step. Subsequent processing of a liquid portion of the effluent which is left after flash vaporization involves recovery of catalyst and polymeric by-products therefrom in a steam stripping vessel. Also disclosed is a multiple reactor system which can be used for continuous trimerization of ethylene to 1-hexene while at the same time washing polymeric by-products from one of the reactors in the series using a wash oil solvent.
摘要:
Disclosed herein is a method for separating from the reactor effluent of an olefin oligomerization procedure those catalyst materials and polymeric by-products which can cause difficulties in the downstream processing of such effluent. Polymer by-products and catalyst in the effluent are separated from reaction products by flash vaporization utilizing an in-situ hot solvent which is contacted with the effluent and serves as the heating medium to promote this flash vaporization step. Subsequent processing of a liquid portion of the effluent which is left after flash vaporization involves recovery of catalyst and polymeric by-products therefrom in a steam stripping vessel. Also disclosed is a multiple reactor system which can be used for continuous trimerization of ethylene to 1-hexene while at the same time washing polymeric by-products from one of the reactors in the series using a wash oil solvent.
摘要:
This disclosure relates generally to low temperature steam stripping methods for byproduct polymer and solvent separation from an ethylene oligomerization process. The methods disclosed have been found to separate byproduct polymer from solvent without fouling process equipment or causing other process problems. The byproduct polymer ends up as flowable solid particles in a water stream that may be easily discharged from the process, while solvent is recovered for recycle to the process. In embodiments of the invention, over 90 wt % of the solvent used is recovered and the discharged byproduct polymer is less than 20 wt % solvent.
摘要:
The invention relates to olefin oligomerization methods and methods for reducing/inhibiting fouling in olefin oligomerization reactions comprising: contacting, in an oligomerization reactor (e.g., under oligomerization conditions), an alpha-olefin feed, a catalyst having an olefin selectivity of at least 90 mol % to a desired oligomerization product, a polymer anti-foulant, and optionally a diluent; selectively producing an effluent comprising the desired oligomerization product, unreacted olefin, and alpha-olefin-based polymer byproduct that causes fouling. The amount of polymer anti-foulant can be chosen to limit fouling to ≦20 g/kg desired oligomerization product, to remediate ≧3 grams fouled polymer/kg desired oligomerization product, and/or to reduce/inhibit polymer fouling by ≧10% over a selective oligomerization with substantially no added polymer anti-foulant. Advantageously, desired oligomerization product so obtained can also be polymerized/copolymerized with an alpha-olefin such as ethylene.
摘要:
The invention relates to olefin oligomerization methods and methods for reducing/inhibiting fouling in olefin oligomerization reactions comprising: contacting, in an oligomerization reactor (e.g., under oligomerization conditions), an alpha-olefin feed, a catalyst having an olefin selectivity of at least 90 mol % to a desired oligomerization product, a polymer anti-foulant, and optionally a diluent; selectively producing an effluent comprising the desired oligomerization product, unreacted olefin, and alpha-olefin-based polymer byproduct that causes fouling. The amount of polymer anti-foulant can be chosen to limit fouling to ≦20 g/kg desired oligomerization product, to remediate ≧3 grams fouled polymer/kg desired oligomerization product, and/or to reduce/inhibit polymer fouling by ≧10% over a selective oligomerization with substantially no added polymer anti-foulant. Advantageously, desired oligomerization product so obtained can also be polymerized/copolymerized with an alpha-olefin such as ethylene.
摘要:
Disclosed herein are methods and apparatus for deactivating a catalyst composition in an reaction product stream. One such method and apparatus contact the catalyst composition with a catalyst-deactivating composition and a diluent in a vapor phase of a product-receiving vessel, wherein the boiling point of the diluent is at least 5.0° C. greater than the boiling point of the catalyst-deactivating composition. Also disclosed are oligomerization systems for producing oligomers.
摘要:
Disclosed herein are methods and apparatus for deactivating a catalyst composition in an reaction product stream. One such method and apparatus contact the catalyst composition with a catalyst-deactivating composition and a diluent in a vapor phase of a product-receiving vessel, wherein the boiling point of the diluent is at least 5.0° C. greater than the boiling point of the catalyst-deactivating composition. Also disclosed are oligomerization systems for producing oligomers.
摘要:
Methods for preparing selected oligomers from monomers utilize systems of equipment adapted to provide desired compositions in various streams. Representative equipment of an oligomerization system includes an oligomer synthesis reactor and, optionally, a gas/liquid phase separation system. A monomer feed stream and a catalyst feed stream are directed to the oligomer synthesis reactor. The reactor produces a vapor phase effluent and a liquid phase effluent. The selected oligomer product is withdrawn from the vapor phase effluent. When the gas/liquid phase separation system is included, it is adapted to form a first recycle stream and a separator product stream from the vapor phase effluent. The separator product stream includes the desired oligomer product. Additional equipment may be utilized to further refine the vapor phase effluent and/or the final product stream.
摘要:
A fishing rod holder includes a central shaft with telescoping sections and a pair of support legs secured adjacent the first end thereof. A third support leg attached to the central shaft provides further supports. A rod support arm is pivotally secured within a vertical slot in the second end of the central shaft. A second end of the rod support arm includes a forked end with finger sections. A T-shaped hanger supported by the forked end has a central leg section pivotally secured to a strap that engages the handle of a fishing pole. The fishing pole is free to pivot up and down relative to the T-shaped hanger. Raising the fishing pole disengages the T-shaped hanger from the support arm, thereby pivoting the rod support arm to a vertical orientation. An anchor further secures the central shaft to a support surface.
摘要:
A bite-signaling device comprises a clamp member securing the device to the rod of the rod and reel combination. A linear support member is pivotally connected at a first end to the clamp member. The second end of the linear support member includes a perpendicular section with a linear signal member rotatably attached thereto. The linear signal member includes a weighted first end and a signaling second end. A line attachment member is secured to the signaling second end of the linear signal member and releasably secures a fishing line attached to a reel of the rod and reel combination. The fishing line secured to the line attachment member maintains the weighted first end of the signal member elevated relative to the signaling second end thereof. Releasing the fishing line from the line attachment member causes the weighted first end to rotatably descend and elevate the signaling second end of the signal member.