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| Number | Title | Issue Date |
| 7619098 | Method for producing phthalic anhydride that conforms to specifications Process for the preparation of on-spec phthalic anhydride by the distillative purification of crude phthalic anhydride at reduced pressure, where the crude phthalic anhydride is passed to the distillation column above a side take-off, the low-boiling components are ... | 11/17/2009 |
| 6984289 | Process of generating o-xylene-air mixtures for the production of phthalic anhydride Process for generating a homogeneous gas mixture of o-xylene and air for the production of phthalic anhydride wherein o-xylene is completely evaporated in the absence of oxygen, superheated and then mixed with air and supplied to a phthalic anhydride reactor. ... | 01/10/2006 |
| 6884324 | Column for concentrating phthalic anhydride To improve the columns used so far for producing phthalic anhydride, and to make them less expensive and easier to install, it is proposed that in the column for concentrating phthalic anhydride two distillation stages are arranged, wherein the removal of the low-bo... | 04/26/2005 |
| 6715742 | Process and apparatus for cooling a hot reaction gas, for example for manufacturing phthalic anhydride A process for cooling a hot reaction gas, as formed, in the preparation of phthalic anhydride by oxidation of o-xylene with hot air in a reactor (213), to a predetermined inlet temperature for introduction into a separator (221), in which the separatio... | 04/06/2004 |
| 6670487 | Method for removing impurities from oxidation products Disclosed is a method for removing impurities from products derived from oxidation of an ortho-dialkylaromatic compound which comprises at least one step selected from the group consisting of extraction of an aqueous solution comprising aromatic dicarboxy... | 12/30/2003 |
| 6420401 | 1,2,5, thiadiazolidin-3-one 1,1-dioxide derivatives Substituted derivatives of 1,2,5-thiadiazolidin-3-one 1,1-dioxides, oligomers containing them, and methods of using them.... | 07/16/2002 |
| 6380399 | Process for producing phthalic anhydride The invented process produces phthalic anhydride through gas-phase catalytic oxidation of ortho-xylene and/or naphthalene with an oxygen-containing gas using one or more fixed bed reactors. In the process, the gas-phase catalytic oxidation process is perf... | 04/30/2002 |
| 5869700 | Method for recovering phthalic anhydride/maleic anhydride mixtures by distillation A process for recovering phthalic anhydride and maleic anhydride from a maleic anhydride-rich vapor phase oxidation product comprising the step of: contacting the vapor phase oxidation product with: (i) at least one by-product stream having a freezing poi... | 02/09/1999 |
| 5730844 | Liquid phthalic anhydride recovery process using a rectification tower with benzoic acid control A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130° C. or greater with a first stream comprising maleic anhydride, benzoi... | 03/24/1998 |
| 5731443 | Liquid phthalic anhydride recovery process using a rectification tower A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature in the range of about 130° C. or greater with a first stream comprising maleic anhy... | 03/24/1998 |
| 5718808 | Solvent assisted process for recovery of phthalic anhydride in the liquid phase by distillation A process for recovering phthalic anhydride as a liquid from a vapor phase oxidation product which comprises mixing the vapor phase oxidation product having a temperature of about 130° C. or greater with a first stream comprising a solvent having a boili... | 02/17/1998 |
| 5686055 | Process for recovering phthalic anhydride and hydrogen chloride from plastic materials There is provided a process to recover phthalic anhydride from a plastic material which contains a phthalate ester as a plasticizer comprising the steps of: (a) heating the plastic material so that the plastic material is gasified to produce a first produ... | 11/11/1997 |
| 5683553 | Preparation of 3-chlorophthalic anhydride A process for preparing essentially pure 3-chlorophthalic anhydride from a mixture in which 3-chlorophthalic anhydride is present in addition to 4,5-dichlorophthalic anhydride, which involves first distilling off a mixture of 3-chlorophthalic anhydride an... | 11/04/1997 |
| 5670660 | Process for collecting airborne anhydrides An apparatus and process for the recovery of airborne anhydrides such as anhydride vapor or dust wherein these airborne anhydrides are contacted with hot glycol, such as diethylene glycol, in the liquid phase to first dissolve and then react with the airb... | 09/23/1997 |
| 5585502 | Process and plant for the purification of raw maleic anhydride recovered from gaseous reaction mixtures In the purification of maleic anhydride obtained with an oxidation process, by means of absorption with an organic solvent and fractionation of the resulting liquid phase and purification of the crude maleic anhydride thus separated, the above purificatio... | 12/17/1996 |
| 5508443 | Liquid phthalic anhydride recovery process A process for separating phthalic anhydride from a vapor phase oxidation product by mixing and cooling the vapor phase oxidation product with recycled by-products which have freezing points lower than the freezing point of pure phthalic anhydride, thereby... | 04/16/1996 |
| 5336788 | Method of making oxydiphthalic anhydride Disclosed is a method of making oxydiphthalic anhydride from oxydiphthalic acid. The oxydiphthalic acid is mixed with an organic liquid that codistills with water and the resulting slurry is heated to the boiling point of the slurry to remove any water. A... | 08/09/1994 |
| 5278319 | Process for the production of hydrocarbon partial oxidation products An improved process is provided for the production of a partial oxidation product by the vapor phase reaction of a hydrocarbon with substantially pure oxygen in the presence of a suitable catalyst. In the improved process, the partial oxidation product is... | 01/11/1994 |
| 5262547 | Process for the production of petrochemicals Petrochemicals are produced by the vapor phase reaction of a hydrocarbon with substantially pure oxygen in the presence of a suitable catalyst. In the improved process, the principal product is removed, carbon monoxide, present in the reactor effluent as ... | 11/16/1993 |
| 5235070 | Suppression of dust from solid aromatic anhydrides A method for reducing the formation of dust produced by solid aromatic anhydrides, and aromatic anhydride compositions that have a reduced tendency to emit aromatic anhydride dust, are disclosed. The method comprises treating the aromatic anhydride with l... | 08/10/1993 |
| 5214157 | Process for the disposal of phthalic anhydride decomposer vapors A system for producing phthalic anhydride by vapor phase oxidation of orthoxylene, naphthalene or the like which comprises an oxidation section, and a finishing section comprising: a means for decomposing crude phthalic anhydride liquid such that water, v... | 05/25/1993 |
| 5210223 | Elevated pressure phthalic anhydride process The present invention is an improvement to the conventional process for the production of phthalic anhydride. In particular, the present invention enables the crude phthalic anhydride product to be recovered in a more efficient manner.... | 05/11/1993 |
| 5179215 | Process for the production of petrochemicals An improved process is provided for the production of a petrochemical by the vapor phase reaction of a hydrocarbon with an oxygen-containing gas in the presence of a suitable catalyst to produce a flammable gaseous product stream comprising the desired pe... | 01/12/1993 |
| 5145971 | Process for the preparation of oxydiphthalic acid and purified oxydiphthalic anhydride from crude oxydiphthalic anhydride A process for the preparation of purified oxydiphthalic acid from impure oxydiphthalic anhydride, by treating with a mixture of water and propionic acid or butyric acid to produce oxydiphthalic acid. The acid may be treated to reform oxydiphthalic anhydri... | 09/08/1992 |
| 5101050 | Process for the production of aromatic anhydrides and aromatic esters with superior color properties A process for the production of aromatic esters or aromatic anhydrides with improved color properties is disclosed. This process comprises treating the aromatic ester or aromatic anhydride with an activated boric acid followed by fractionation.... | 03/31/1992 |
| 4987239 | Process for the production of anhydrides An improved process is provided for the production of anhydrides from hydrocarbons by reaction with an oxygen-containing gas comprising oxygen, air or a gas enriched in oxygen relative to air, in the presence of a suitable catalyst. In the process, a sele... | 01/22/1991 |
| 4906760 | Purification of anhydrides Process for the purification of organic polyanhydrides to substantially-completely remove trace metals, such as for the production of metal-free electronic grade polymers. The process comprises decyclizing in an aqueous vehicle to form the polyacid, treat... | 03/06/1990 |
| 4855457 | Carboxylic anhydride process In accordance with the process of this invention, an improved catalyst for molecular oxidation of a hydrocarbon to form the corresponding carboxylic anhydrides is prepared by the steps of (a) forming a catalyst precursor by depositing on titanium dioxide ... | 08/08/1989 |
| 4696683 | Method and equipment for separation of solids from gaseous mixtures The invention solves a method and an apparatus for the separation of solids from gaseous mixtures especially the separation of phthalic anhydride after its desublimation from mixtures with vapours of sublimable substances, steam, air or inert gases, which... | 09/29/1987 |
| 4659842 | Phthalic anhydride process and product A phthalic anhydride product having a particle configuration made up of a mixture of spheroids, needle-like crystals, and amorphous particles is produced by feeding molten phthalic anhydride at a temperature between 131° and 155° into a spray nozzle in ... | 04/21/1987 |
| 4568427 | Continuous isolation of phthalic anhydride and maleic anhydride from reaction gases A process for the continuous isolation of phthalic anhydride and maleic anhydride from the reaction gases obtained by catalytic oxidation of o-xylene or naphthalene with air, wherein the reaction gases are treated with a hydrocarbon of boiling range from ... | 02/04/1986 |
| 4562264 | Process for the recovery of five-membered ring dicarboxylic acid anhydrides A process for the recovery of five-membered ring dicarboxylic acid anhydrides from aqueous solutions of the corresponding dicarboxylic acids which entails (a) washing the aqueous solution of the dicarboxylic acid with a water-insoluble tertiary amine, and... | 12/31/1985 |
| 4547578 | Process for removing naphthoquinone from phthalic anhydride produced through air oxidation of naphthalene The invention relates to a process for removing naphthoquinone from phthalic anhydride produced by the air oxidation of naphthalene or mixtures containing naphthalene. Specifically, crude phthalic anhydride containing naphthoquinone is treated at a temper... | 10/15/1985 |
| 4497958 | Process for oxidizing a carboxylic anhydride with heterogeneously prepared vanadium-phosphorus-oxygen containing catalyst composition A heterogeneous process for preparing a vanadium-phosphorus-oxygen containing catalyst for use in the preparation of carboxylic anhydrides is disclosed. This process employs an activation procedure in an air-hydrocarbon atmosphere.... | 02/05/1985 |
| 4485244 | Thermal process for the liquefaction of aromatic hydrocarbon oxidation residues and recovery of acetic acid A thermal process for the decarboxylation and dehydration of aromatic acid residue to convert such residue to grindable form and recover the solvent of reaction therefrom.... | 11/27/1984 |
| 4435581 | Process for the production of phthalic anhydride A system for producing phthalic anhydride by the catalytic oxidation of naphthalene, wherein the system is characterized by reduced capital and operating costs due to lower operating pressures.... | 03/06/1984 |
| 4435580 | Process for the production of phthalic anhydride A system for producing phthalic anhydride by the catalytic oxidation of naphthalene, wherein without creating a significant pressure drop in the system substantially all of the catalyst particles are removed from the product stream before the product stre... | 03/06/1984 |
| 4430163 | Process for the continuous separation of slightly volatile components from a crude phthalic acid anhydride A process is provided for the continuous separation of slightly volatile components from a crude phthalic acid anhydride wherein a portion of the crude phthalic acid anhydride is compressed and heated before being reintroduced into a flash evaporator.... | 02/07/1984 |
| 4285871 | Process for continuously separating phthalic anhydride from the reaction gases of the catalytic oxidation of o-xylene and/or naphthalene Phthalic anhydride is continuously separated from the reaction gas mixture formed by the catalytic oxidation of o-xylene and/or naphthalene, by treating said reaction gas mixture with a maleic anhydride absorbent.... | 08/25/1981 |
| 4285870 | Process for continuously separating phthalic anhydride from the reaction gases of the catalytic oxidation of o-xylene and/or naphthalene Phthalic anhydride is continuously separated from the reaction gas mixture formed by the catalytic oxidation of o-xylene and/or naphthalene, by treating said rection gas mixture in at least two absorption stages with organic absorbents. The absorbent empl... | 08/25/1981 |
