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| Number | Title | Issue Date |
| 7358414 | Para-xylene process using perm-selective separations Processes and apparatus are disclosed for recovery of purified products from a fluid mixture by means of integrated perm-selective separations with purified product recovery operations. More particularly, integrated processes of the invention comprise separations by... | 04/15/2008 |
| 7249469 | Method for separating a multicomponent stream This invention relates to a method for separating a stream having benzene, toluene and alkyl benzene, said method comprising: feeding the stream into a first distillation column, wherein the stream comprises between about 60 mole percent to about 85 mole percent tol... | 07/31/2007 |
| 6894202 | Method for producing 2,6-dimethylnaphthalene An object of the present invention is to provide a method for manufacturing 2,6-DMN, in which even when a mixture containing DMN isomers which includes 5 wt % or more of 2,7-DMN is used, a highly pure 2,6-DMN can be obtained. The method for manufacturing the highly ... | 05/17/2005 |
| 6737558 | Process for the separation of 2,6-dimethylnaphthalene from mixtures containing it Process for the separation of 2,6-dimethylnaphthalene from mixtures containing it, comprising the following operations: crystallization by the addition of a solvent and cooling of the mixture to a temperature higher than the formation value of the first eutec... | 05/18/2004 |
| 6525235 | Method for manufacturing 2,6-dimethylnaphthalene The present invention provides a method for manufacturing a highly pure 2,6-dimethylnaphthalene having a purity of 99% or more even when a mixture of dimethylnaphthalene isomers containing 5 wt % or more of 2,7-dimethylnaphthalate is used as a feedstock. ... | 02/25/2003 |
| 6383233 | Separation process A process is described for separating a desired substance from an aggregate mixture in which process a three-phase dispersion is formed, the first phase comprising droplets phase comprising a liquid transport phase, and the third phase comprising a surfac... | 05/07/2002 |
| 6074441 | Process for producing ultrafine-crystallization products The process for producing crystallisation products with an average particle diameter of | 06/13/2000 |
| 6072098 | Process for producing highly pure 2,6-dimethylnaphthalene There are disclosed an industrially advantageous process for efficiently producing highly pure 2,6-dimethylnaphthalene (DMN) in high yield from a mixture of DMN by carrying out in turn, the steps of isomerizing a mixture of DMN in the presence of a cataly... | 06/06/2000 |
| 5948949 | Process for producing 2,6-dimethylnaphthalene A process for producing highly pure 2,6-dimethylnaphthalene in a high yield from a mixture of dimethylnaphthalene isomers in the presence of a solvent, such as an aliphatic or alicyclic saturated hydrocarbon. Highly pure 2,6-dimethylnaphthalene can be pro... | 09/07/1999 |
| 5718733 | Method for accelerating solidification of low melting point products A method for accelerating the solidification rate of low melting products is disclosed. The method of the invention comprises the atomization of a molten low-melting product within a fluid stream which greatly enhances the rate at which the low-melting pr... | 02/17/1998 |
| 5498822 | Single temperature stage crystallization of paraxylene This invention is a crystallization process for p-xylene recovery. A single temperature crystallization stage is used for producing p-xylene from a feed having an above equilibrium p-xylene concentration, such as from toluene disproportionation.... | 03/12/1996 |
| 5447542 | Process for separating and purifying substances by crystallization from the melt In the process for separating and purifying substances by crystallization from the melt under pressure, the melt is subjected to pressure under an inert gas atmosphere and then cooled, whereupon it crystallizes. The residual melt is separated from the res... | 09/05/1995 |
| 5447541 | Process for separating and purifying substances by crystallization from the melt under high pressure Process for separating and purifying substances by crystallization from the melt under high pressures In the process for separating or purifying substances by crystallization from melts or highly concentrated solutions under high pressures, gas is dissolv... | 09/05/1995 |
| 5409505 | Method and apparatus for crystallization of organic matter Adiabatic self-evaporation cooling of a refrigerant is performed in a crystallizer for a treated organic matter which contains the refrigerant and is fed into the crystallizer. Crystals produced by the adiabatic self-evaporation cooling are withdrawn from... | 04/25/1995 |
| 5264653 | Process for purifying 1,1,3,4,4,6-hexamethyltetralin A process for purifying 1,1,3,4,4,6-hexamethyltetralin is disclosed comprising melting crude 1,1,3,4,4,6-hexamethyltetralin in methanol with heating, cooling the resulting suspension, and adding seed crystals at a temperature of 45°-60° C.; as well as a... | 11/23/1993 |
| 5055630 | Process for making p-xylene with a purity of more than 99.8% by weight The process for obtaining a p-xylene final product more than 98% pure from a crystalline starting material with a purity of about 98%, includes the steps of intermixing the starting material with precooled water and fed back recovered p-xylene in a mixer ... | 10/08/1991 |
| 4956520 | Separation process Separation of a crystallizable component, especially paraxylene, from solution by chilling to form a slurry of crystals and liquid, separating crystals of the component in a first separator while simultaneously washing the crystals with a wash liquid and ... | 09/11/1990 |
| 4952750 | Process for making p-xylene with a purity of at least 99.5% This process is an improvement of a process described in German Open Patent Application No. 3703646 for obtaining a p-xylene product with a purity of at least 99.5%. The inert fluid used as a cold carrier is mixed with a crude product starting material, w... | 08/28/1990 |
| 4727218 | Procedure and means for separating or purifying organic substances Method and apparatus for separating and/or purifying a substance from a molten mixture by crystallization, in which the molten mixture is conducted into an annular space defined by two substantially curvilinearly-shaped surfaces, one of the surfaces being... | 02/23/1988 |
| 4331826 | Process for separating p-xylene from a hydrocarbon mixture A process and an apparatus therefor are described for separating p-xylene from a p-xylene containing hydrocarbon liquid feed material by crystallization, said process comprising (1) mixing a p-xylene containing hydrocarbon feed material with an inert liqu... | 05/25/1982 |
| 4313012 | Producing anthracene from creosote Anthracene is precipitated in improved purity and yield by cooling a creosote coal tar distillation fraction. A ketone such as acetone is added to the fraction before the anthracene precipitates. The ketone retains phenanthrene and/or carbazole in the liq... | 01/26/1982 |
| 4093672 | Process for the recovery of ultrahigh purity indene Indene is recovered in ultrahigh purity from a liquid hydrocarbon mixture comprising indene and organic impurities of which at least one has a melt point above indene and of which at least one has a melt point below indene by a process comprising (1) crys... | 06/06/1978 |
| 3963795 | Separation of isomers by selective melting in an immiscible liquid A process is disclosed for separating the isomers of xylene from a mixture of C8 aromatic isomers by the steps of: 1. cooling the C8 aromatic isomers to a temperature of about -65°C to about -90°C to form a slurry of xylene isomer ... | 06/15/1976 |
| 3959978 | Separation process by fractional crystallization A crystallisable component, for example paraxylene, is separated from solution by chilling, separating crystals, washing them, chilling the mother liquor in the presence of wash liquid, separating further crystals and washing them. The invention enables c... | 06/01/1976 |
