Class 528/484 - Preventing or removing reactor or processing equipment buildup

Subclass of Class 528 - Synthetic resins or natural rubbers -- part of the class 520 series
Definition: Processes wherein the accumulation of material on the reactor
No. of patents: 36
Last issue date: 12/28/2010

Number	Title	Issue Date
7858736	Polymer recovery method This invention relates to a process comprising contacting an polymerization reactor effluent with a fluorinated hydrocarbon and thereafter recovering olefin polymer, where the fluorinated hydrocarbon is present at 5 volume % to 99 volume % based upon the volume of t...	12/28/2010
7332070	Method of preventing heat exchanger fouling A specific nonionic surfactant is added to a component mainly comprising hydrocarbons before passing through a heat exchanger in a petrochemical plant or a polyolefin production plant, whereby fouling of the heat exchanger can be efficiently prevented, that is, the ...	02/19/2008
7129322	Method for producing polymer alloy polymer alloy formed article transparent formed article and optical film This invention provides a method for producing a polymer alloy, a polymer alloy as well as a molded article, a transparent molded article and an optical film, which is obtainable by using the polymer alloy. The invention is a method for producing a polymer al...	10/31/2006
6806350	Washing process for the purification of polymers containing N or amino, ammonium or spirobicyclic ammonium groups The invention relates to a washing process for cleaning polymers containing N or amine, ammonium or spirobicyclic ammonium groups, comprising cationic groups containing N, in addition to suitable counterions, whereby the gelled-out polymers are obtained through poly...	10/19/2004
6586549	Water-absorbing composition and its use The present invention provides: a water-absorbing composition such that portions containing the water-absorbing composition in a high concentration exhibit excessive-liquid permeation buffering effects in absorbent articles comprising the water-absorbing ...	07/01/2003
6576774	Process for recycling polytrimethylene terephthalate cyclic dimer This invention is an improvement upon the known process for polymerization of polytrimethylene terephthalate by esterification of terephthalic acid or dimethyl terephthalate with 1,3-propane diol, precondensation of the esterification product to produce a...	06/10/2003
5786443	Process of making polyester prepolymer A continuous process for preparing polyester prepolymer comprising the steps of esterifying a diacid with a diol, reacting the esterified product with additional diol, and passing the product downward through a countercurrent column reactor while inert ga...	07/28/1998
5741888	Removal of heteropoly compounds from polyethers, polyesters and polyether esters A method of removing heteropoly compounds from polyethers, polyesters and/or polyether esters, which are contaminated with heteropoly compounds is described, which comprises adding, to the polymers or a solution thereof, an ether whose polarity is so low ...	04/21/1998
5648437	Process for the manufacture of thermoplastic polycarbonate The present invention provides a melt process for the manufacture of thermoplastic solvent-free polycarbonates with the use of a continuously operated tubular reactor for monophenol vaporization....	07/15/1997
5599884	Amino resin dispersion with reduced aldehyde content, process therefor, and paint detackifying process therewith Amino resins that contain more free formaldehyde than is desirable for health and/or pollution reasons can be treated with a mixture of diketo reagents (or their nitrogen analogs) and other compounds containing amino moieties to reduce the free formaldehy...	02/04/1997
5521278	Integrated process for the manufacture of lactide An integrated process for the manufacture of lactide from a solution of lactic acid in de-ionized water comprising the sequential steps: A. Dehydrating the aqueous lactic acid in at least two stages to effect condensation polymerization of the lactic acid and ...	05/28/1996
5429780	Manufacture of silicon carbide foam from a polyurethane foam impregnated with resin containing silicon A process for preparing a silicon carbide foam by impregnating a polyurethane foam with a suspension of silicon powder in an organic resin, heating progressively to polymerize the resin, heating further to carbonize the polyurethane foam and resin, and fi...	07/04/1995
5420239	Method for inhibiting popcorn polymer formation by heat Inhibition of popcorn polymer growth by treatment with heat. Heat can be applied to extant popcorn polymer, particularly in the absence of organic material from which the popcorn polymer is formed. A chemical inhibitor of popcorn polymerization can be use...	05/30/1995
5384389	Process for the production of polycarbonates A process for the production of polycarbonates is disclosed. Accordingly, oligocarbonate in the melt is passed through a heated tube and inert gas is simultaneously introduced by injecting to the melt....	01/24/1995
5357009	Polymer scale preventive agent A polymer scale preventive agent for use in polymerization of a monomer having an ethylenically unsaturated double bond, comprising an alkaline solution containing a condensation product of (A) an aliphatic diamine compound and (B) an aromatic tetracarbox...	10/18/1994
5229487	Method for metered supply of material, apparatus therefor, and method for production of hydrophilic polymer by use thereof A method for metered supply of a delivered material to the next step, which method is characterized by regulating the thickness of the material on a conveyor before the material in the process of transfer on the conveyor from the incoming end thereof to t...	07/20/1993
5216121	Process for facilitating the handling of tacky polymers during their polymerization The invention includes a process for facilitating the handling of tacky polymers (specifically amorphous polypropylene and amorphous ethylene propylene copolymers) during their polymerization comprising: a. preparing a mixture of a tacky polymeric material and...	06/01/1993
5037955	Method for heating a viscous polyethylene solution The invention disclosed herein is a single-pass, horizontal heat exchanger, of the shell and tube type, which is designed for preheating of a viscous material, such as the reactor effluent of a polyethylene solution. The heat exchanger is made in three se...	08/06/1991
5028670	Process for the gas-phase polymerization of olefins in a fluidized-bed reactor The present invention relates to a process and apparatus for the gas-phase polymerization of olefins in a fluidized-bed reactor maintained at a temperature T1. A gaseous reaction mixture comprising the olefins to be polymerized passes through the reactor ...	07/02/1991
4973655	Continuous production of linear thermoplastic polyesters A process for the continuous production of linear thermoplastic polyesters comprises the following steps: (a) passing a transesterification or esterification product of an aliphatic or aromatic dicarboxylic acid having a molecular weight of	11/27/1990
4904309	Chemical cleaning method of the interior of polymerization reactor A chemical cleaning method for removing scales and other substances deposited on the interior of a polymerization reactor used in emulsion polymerization or suspension polymerization. This method comprises chemically cleaning the interior using an aqueous...	02/27/1990
4883859	Process for producing hydroxylated polybutadiene In the process of producing hydroxylated polybutadiene from a diene monomer in the presence of hydrogen peroxide and a solvent, wherein the solvent is recovered by distillation for reuse; after separation of the hydroxylated polybutadiene from mixture con...	11/28/1989
4731126	Composition and method for purging polymeric residues Compositions comprising thermoplastic polymers having added thereto small amounts of a hydroxymethyl-substituted carboxylic acid are usefully employed to remove accumulated polymeric residues from polymer processing equipment....	03/15/1988
4696983	Polymerization reactor coatings and use thereof Compositions of salts of water-soluble, carboxyl-containing polymers and surface active agents, deposited on polymerization reactor surfaces exposed to polymerization mixtures, substantially reduce or eliminate undesirable polymer build-up on reactor surf...	09/29/1987
4517350	Process for removing polymer scale adhering to a polymerization vessel A method for removing polymer scales adhering to the inner surface of a polymerization vessel, which comprises polymerizing vinyl chloride monomer in an aqueous medium, discharging the resulting vinyl chloride polymer together with the aqueous medium from...	05/14/1985
4468257	Washing and removal method of high molecular substances Method of adding water and a hydroxide of an alkali metal or alkaline earth metal to a washing solvent such as an alkylamide and/or alkylsulfoxide when washing and removing high molecular substances stuck on the interior of a production apparatus or moldi...	08/28/1984
4370302	Machine for solid phase polymerization A machine for solid phase polymerization comprises: a system for supplying particles of a synthetic polymer; a reaction system for effecting solid phase polymerization of the particles, fed from the supplying system, under a vacuum and heated condition; a...	01/25/1983
4200712	Coating polymerization reactors with oligomer coatings derived from reaction products of substituted phenols This invention relates to a polymerization reaction vessel having a coating on the inner surfaces thereof resulting from applying thereto a coating composition containing, as a primary ingredient, the reaction product or oligomers of (1) an alkyl or halog...	04/29/1980
4146696	Industrial production of cast plastic lenses The process of the preparation of production quantities of lens devices fabricated from synthetic resinous substances, normally referred to as "plastic lenses." The process utilizes a molding formulation which enables reusable mold cavities to be utilized...	03/27/1979
4122075	Method of preventing deposit of polymer in reactor vent line during preparation of nylon A process for preventing deposits when venting steam containing entrained polymer from high pressure reactors used for preparing nylon from dicarboxylic acid and diamine. The hot steam generated during condensation polymerization of the reactants is vente...	10/24/1978
4098972	Method for bulk polymerization of vinyl chloride Vinyl chloride monomers or a monomeric mixture composed mainly of vinyl chloride is bulk-polymerized in a polymerization vessel. The inner walls and other surfaces of said vessel, coming into contact with the monomer or monomers, are coated with one or mo...	07/04/1978
4049894	Latex modified portland cement and use thereof in polymerization reactors In the aqueous polymerization of vinyl chloride and vinylidene chloride polymers and copolymers, the polymer build up normally experienced in many areas of commercial polymerization reactors is reduced, or when such polymer build up does occur it is more ...	09/20/1977
4048417	Process for preventing build-up in polymerization reactors Process for preventing build-up in the reactors used in the free radical polymerization of ethylenically unsaturated monomers, and more particularly of vinyl chloride, in which the reactor walls are subjected to heat treatment before the reactors are char...	09/13/1977
4043874	Process for separating and recovering the constituents of an exhausted solvent mixture used for cleansing reactors for the polymerization of vinyl chloride The constituents of an exhausted toluene-dimethylformamide solvent mixture used for removing polyvinyl chloride deposits from polymerization reactors, are separated by adding water to said mixture and distilling off toluene, thereby to obtain a distillati...	08/23/1977
4038473	Process for cleaning polymerization reactors In the aqueous polymerization of vinyl chloride and vinylidene chloride polymers and copolymers in reactors having exposed metal surfaces, undesirable thin polymer build up is noted on the metal surface exposed to the polymerization media. Such polymer bu...	07/26/1977
4021600	Slurry polymerization process An improvement in a process for the copolymerization of ethylene and an ଱-olefin having 3 to 18 carbon atoms and optionally also a nonconjugated diene having only one readily polymerizable double bond in the presence of a catalyst and a liquid organ...	05/03/1977

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Class 528/484 - Preventing or removing reactor or processing equipment buildup