Patents Assigned to United Chemical Corporation
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Patent number: 6723291Abstract: A novel flow deflector employed in a fluidized bed reactor for olefin polymerization is disclosed, which is installed on the entry conduit of the reactor, comprising an annular plate and a cone plate and providing at least three paths for the recycle stream to enter the mixing chamber, thereby permitting all the liquid and/or solid material to achieve a more complete and uniform mixing.Type: GrantFiled: August 22, 2000Date of Patent: April 20, 2004Assignees: China Petrochemical Corporation, Tianjin United Chemical CorporationInventor: Wenqing Wu
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Patent number: 6262192Abstract: The present invention provides a polymerization process for producing polymers in a continuous gas phase fluidized bed reactor, wherein a recycle stream is allowed to cool down to below its dew point and the resultant two-phase mixture of the gas and liquid phases is recycled to the reactor, the inert condensable agent introduced into the recycle stream to raise the dew point being saturated hydrocarbons, characterized in that the saturated hydrocarbon is cyclopentane.Type: GrantFiled: August 22, 2000Date of Patent: July 17, 2001Assignees: China Petrochemical Corporation, Tianjim United Chemical CorporationInventor: Wenqing Wu
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Patent number: 5629271Abstract: The invention provides methods for (1) reducing the fluid loss of and (2) reducing the concentration of polymer required to provide a desired degree of fluid loss control to, a well drilling and servicing fluid which contains at least one polymeric viscosifier, at least one polymeric fluid loss control additive, and a water soluble bridging agent suspended in an a liquid in which the bridging agent is not soluble, the methods comprising adding to the fluids a particulate, water soluble, ultra fine filtrate reducing agent having a particle size distribution such that at least 90% of the particles thereof are less than 10 micrometers and the average particle size is from about 3 to about 5 micrometers, the ultra fine filtrate reducing agent being insoluble in the liquid.Type: GrantFiled: March 25, 1994Date of Patent: May 13, 1997Assignee: Texas United Chemical CorporationInventors: James W. Dobson, Jr., Paul D. Kayga, Jesse C. Harrison, III
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Patent number: 5514644Abstract: The invention provides (1) a method of increasing the thermal stability of an aqueous polysaccharide-containing fluid by adding thereto magnesia and a thiosulfate salt; (2) a drilling, completion, or workover fluid comprising an aqueous liquid, a water soluble polysaccharide, magnesia, and a thiosulfate salt; and (3) an additive for increasing the thermal stability of an aqueous polysaccharide-containing fluid which comprises magnesia and a thiosulfate salt in a weight ratio of magnesia to thiosulfate salt from about 0.15/1 to about 6.67/1. The preferred magnesia has an activity index less than 100, most preferably less than 50. The preferred thiosulfate salt is sodium thiosulfate. The preferred polysaccharide is selected from the group consisting of xanthan gum, epichlorohydrin crosslinked starch, carboxymethyl cellulose, and mixtures thereof. The preferred aqueous liquid is a saturated sodium chloride solution.Type: GrantFiled: December 14, 1993Date of Patent: May 7, 1996Assignee: Texas United Chemical CorporationInventor: James W. Dobson
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Patent number: 5238065Abstract: The invention provides a process for the removal of filter cakes containing one or more polysaccharide polymers and bridging particles from the sides of a borehole in a hydrocarbon-producing formation which comprises contacting the filter cake with a novel soak solution comprising an aqueous liquid, a peroxide selected from the group consisting of alkaline earth metal peroxides, zinc peroxide, and mixtures thereof, and an acidic substance to provide the soak solution with a pH in the range from about 1 to about 8, and optionally, an activator for the peroxide, for a period of time at least sufficient to decompose the polysaccharide polymers therein to such an extent that the filter cake forms a loosely adherent mass on the sides of the borehole, and thereafter contacting the filter cake with a wash solution in which the bridging particles are soluble to remove the remaining filter cake solids from the sides of the borehole.Type: GrantFiled: July 13, 1992Date of Patent: August 24, 1993Assignee: Texas United Chemical CorporationInventors: Thomas C. Mondshine, Gerald R. Benta
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Patent number: 4822500Abstract: Disclosed are well working and treating fluids comprising a saturated aqueous saline solution, a particulate water soluble salt which is insoluble in the saturated saline solution, xanthomonas gum, and an epichlorohydrin crosslinked hydroxypropyl starch derivative wherein the xanthomonas gum and the epichlorohydrin crosslinked hydroxypropyl starch derivative interact to synergistically enhance the suspension characteristics of the fluid and to decrease the fluid loss of the fluid.Also disclosed is an additive composition for enhancing the suspension characteristics and reducing the fluid loss of saturated brine based well treating fluids comprising specified proportions of xanthomonas gum and epichlorohydrin crosslinked hydroxypropyl starch.Type: GrantFiled: February 29, 1988Date of Patent: April 18, 1989Assignee: Texas United Chemical CorporationInventors: James W. Dobson, Jr., Alan T. Mondshine, Thomas C. Mondshine
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Patent number: 4645577Abstract: There is disclosed a method for the conversion of urea to cyanuric acid and cyclic by-products which comprises exposing urea in a liquid state to microwave radiation. Urea in liquid form, either molten anhydrous or in solution, is absorbent to microwave radiation, readily converting to cyanuric acid and cyclic by-products such as ammeline and ammelide. The desired products are substantially transparent to microwave radiation and the method thus avoids degradation of the desired products. Conversion of urea with microwave radiation also avoids the difficulties experienced with thermal decomposition that results from the poor thermal conductivity of the crude reaction products. The method thus permits conversion of urea in the form of a layer of urea directly to cyanuric acid and cyclic by-products.Type: GrantFiled: January 3, 1980Date of Patent: February 24, 1987Assignee: United Chemical CorporationInventors: Lester Friedman, Jock A. Hamilton
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Patent number: 4335104Abstract: A multi-purpose anhydrous cosmetic composition which comprises as a major portion, a water insoluble surfactant having a hydrophilic-lipophilic balance of 12 or less, in combination with a small but effective amount of an active ingredient which is soluble in the surfactant. The anhydrous composition is useful as a base material for the making of such cosmetic products as suntan lotions, hand lotions, topical steroids, insect repellants, anti-perspirants, facial lotions, body lotions, therapeutic lotions and the like.Type: GrantFiled: August 16, 1978Date of Patent: June 15, 1982Assignee: United Chemical CorporationInventor: Jon S. VanCleave
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Patent number: 4192766Abstract: A method and composition for decreasing water resistance to movement by decreasing the surface tension and diminishing the contact angle between an object moving through water, and the water, and/or between water passing over an object and the object, thereby allowing the object to move at an increased speed with the same applied moving force or at the usual speed with less applied moving force. The method is accomplished by applying to the surface of the object which is to be moved through water a thin layer of a non-ionic surface active agent which is water insoluble with the agent having a hydrophile-lipophile balance of about 7 to about 9.Type: GrantFiled: November 11, 1977Date of Patent: March 11, 1980Assignee: United Chemical CorporationInventor: Jon S. VanCleave
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Patent number: 4073983Abstract: A method and composition for decreasing water resistance to movement by decreasing the surface tension and diminishing the contact angle between an object moving through water, and the water, and/or between water passing over an object and the object, thereby allowing the object to move at an increased speed with the same applied moving force or at the usual speed with less applied moving force. The method is accomplished by applying to the surface of the object which is to be moved through water a thin layer of a nonionic surface active agent which is water insoluble with the agent having a hydrophile-lipophile balance of about 7 to about 9.Type: GrantFiled: April 25, 1975Date of Patent: February 14, 1978Assignee: United Chemical CorporationInventor: Jon S. Van Cleave