Enhancing production of resin withing specifications
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsKim Dwight Powers, Jeff Scott Levin, Mark Louis Nelson, Jose Cavetano Jaen, Carlos Ray Morris
Life of this patent
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Abstract
A set of trim forward bins is utilized to set aside, distribute and allocate portions of granular product made in a continuous, usually fluidized bed, olefin polymerization reactor, to form blends which more efficiently utilize the products made during transitions from one set of specifications to another and/or to maintain a target property substantially continuously during steady state production of a single product.
Claims23
Method of enhancing the production of a first granular resin product having a first set of properties, said first granular resin product being made in a substantially continuously operating reactor during a campaign including the scheduling of a second granular resin product having at least one property of a value different from that of said first granular resin product comprising (a) optionally passing granular resin product having said first set of properties from said reactor through a conduit or a trim bin, (b) collecting granular resin product from said reactor having said first set of properties in a trim forward bin, (c) changing the conditions of said reactor from conditions for manufacturing granular resin product having said first set of properties to new conditions for manufacturing said second granular resin product, (d) passing granular resin product made using said new conditions in said reactor through said conduit and (e) blending granular resin product from said trim forward bin into said conduit while performing step (d).
Method of controlling granular resin product in substantially continuous production to enhance conformity to a single set of specifications comprising (a) first placing granular product of a second set of properties on top of granules of a first set of properties in a trim bin to form an interface between said quantities of granular product, (b) determining the downward progress of said interface as said trim bin is emptied, and (c) controlling the delivery of each of said quantities of said granular products from said trim bin to a pelleter by itself or as a blend with granular product having a third set of properties at least partly as a function of the position of said interface in said trim bin.
Method of operating a resin manufacturing process to optimize the amount of product produced within specifications when converting from the production of a first particulate product to the production of a second particulate product wherein a reactor products transition products which are (a) blendable into said first particulate product to obtain d product within specification (b) not blendable into either said first or said second particulate product to obtain a product within specifications, and (c) blendable into said second particulate product to obtain a product within specifications, said method comprising:
- (1) placing a quantity of said first particulate product into a first trim bin, (2) blending said first particulate product from said first trim bin into said first transition product (a), (3) placing at least a portion of said transition product (b) in either said first trim bin or a second trim bin (4) placing said transition product (c) in either said first trim bin, said second trim bin, or a third trim bin, and (5) blending said blendable transition product (c) with said second particulate product.
Method of making a granular resin product having a target value z of a property A comprising placing a first granular product having a measured or estimated value x of property A in a trim bin and blending said first granular product from said trim bin into a conduit containing a second granular product having a known or estimated value y or property A to form a third, blended, granular product having a value z of property A.
Method of controlling granular resin product in substantially continuous production to enhance conformity to a target value of at least one property comprising placing a first granular resin product having a first value for said property in a trim bin, and controlling the delivery of said first granular resin product to a pelleter while blending it with a second granular resin product having a second value for said property in a ratio to maintain said property in the resulting blended product at or near a target value.
Method of operating a resin manufacturing process to optimize die amount of product produced within specifications when converting from the production of a first particulate product having a first set of specifications to the production of a second particulate product having a second set of specifications wherein a reactor produces at least one transition product which is (a) blendable into said first particulate product to obtain a product within said first set of specifications, (b) not blendable into either said first or said second particulate product to obtain a product within specifications, or (c) blendable into said second particulate product to obtain a product within said second set of specifications, said method comprising:
- placing a quantity of at least one of said first particulate product, said transition product (a) and said transition product (c) into a trim bin and blending it into a later-produced product in a ratio calculated to obtain a final product having a desired set of specifications.
Dependencies are inferred from the claim text.