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7608733 |
Optimized liquid-phase oxidation
Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out...
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7608732 |
Optimized liquid-phase oxidation
Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out...
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7589231 |
Optimized liquid-phase oxidation
Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out...
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7582793 |
Optimized liquid-phase oxidation
Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out...
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7566802 |
Process for energy recovery and water removal in the preparation of aromatic carboxylic acids
This invention relates to a process for the manufacture of aromatic carboxylic acids by exothermic liquid phase oxidation of an aromatic feedstock. More particularly, this invention relates to the...
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7557243 |
Enriched terephthalic acid composition
A process is provided for producing an enriched carboxylic acid compositions produced by contacting composition comprising a carboxylic acid with an enrichment feed in an enrichment zone to form an...
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7556784 |
Optimized production of aromatic dicarboxylic acids
Disclosed is an optimized process and apparatus for more efficiently and economically producing aromatic discarboxylic acids. The process reduces costs associated with hydrogenation by forming a...
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7546747 |
Process for production of a dried carboxylic acid cake suitable for use in polyester production
The present invention relates to a process by which a dried carboxylic acid cake is obtained from a slurry or cake carboxylic acid product through the use of at least one counter current wash. More...
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7541489 |
Method of making halophthalic acids and halophthalic anhydrides
A method of preparing a halophthalic acid is disclosed which comprises the steps of contacting in a liquid phase reaction mixture at least one halogen-substituted ortho-xylene with oxygen and...
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7507856 |
Method of oxidising hydrocarbons to acids
The present invention relates to a process for the oxidation of hydrocarbons, in particular of branched or unbranched saturated aliphatic hydrocarbons, of cycloaliphatic or alkylaromatic...
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7494641 |
Extraction process for removal of impurities from an oxidizer purge stream in the synthesis of carboxylic acid
Disclosed is a process that relates to the recovery of a metal catalyst from an oxidizer purge stream produced in the synthesis of carboxylic acid, typically terephthalic acid. The process involves...
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7491369 |
Oxidation system with internal secondary reactor
Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out...
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7485747 |
Two stage oxidation process for the production of aromatic dicarboxylic acids
Disclosed is a process for producing a benzenedicarrboxylic acid such as terephthalic acid wherein a dialkyl benzene compound and acetic acid having catalyst components dissolved therein are fed to...
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7485746 |
Staged countercurrent oxidation
A process for oxidation with oxygen of at least one aromatic hydrocarbon having oxidizable, substituents that maximizes the utilization of oxygen without reduction in the quality of the carboxylic...
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7465824 |
Process for the production of high purity aromatic carboxylic acids using a benzoic acid and water solvent for oxidation and purification
A process is disclosed for producing at least one high purity aromatic carboxylic acid by oxidizing an aromatic feedstock with oxygen in a reaction medium comprising the aromatic feedstock, a...
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7410632 |
Extraction process for removal of impurities from mother liquor in the synthesis of carboxylic acid
A method for removing impurities from a mother liquor comprising a carboxylic acid, a metal catalyst, impurities by (a) evaporating the mother liquor comprising a carboxylic acid, the metal...
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7378544 |
Anthracene and other polycyclic aromatics as activators in the oxidation of aromatic hydrocarbons
The present invention relates to the liquid phase oxidation of aromatic hydrocarbons in the presence of at least one heavy metal oxidation catalyst and bromine, which is activated by at least one...
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7371866 |
Preparation of aromatic and heteroaromatic carboxylic acids by catalytic ozonolysis
A process for catalytically oxidizing alkylaromatic compounds of the formula (I)
Ar—CH 2 —R
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7361784 |
Optimized liquid-phase oxidation
Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out...
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7358392 |
Process for the oxidative purification of terephthalic acid
Disclosed is a process to produce a purified carboxylic acid slurry. The process comprises removing impurities from a crystallized product in a solid liquid displacement zone to form the purified...
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7358389 |
Oxidation system employing internal structure for enhanced hydrodynamics
Disclosed is an optimized process and apparatus for more efficiently and economically carrying out the liquid-phase oxidation of an oxidizable compound. Such liquid-phase oxidation is carried out...
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7348452 |
Liquid phase oxidation of P-xylene to terephthalic acid in the presence of a catalyst system containing nickel, manganese, and bromine atoms
A method for liquid phase oxidation of p-xylene with molecular oxygen to terephthalic acid that minimizes solvent loss through solvent burn and minimizes the formation of incomplete oxidation...
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7238833 |
Production of aromatic carboxylic acids
A process for the production of an aromatic carboxylic acid comprising contacting in the presence of a catalyst, within a continuous flow reactor, one or more precursors of the aromatic carboxylic...
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7196215 |
Process for the production of purified terephthalic acid
Disclosed is a process for the production of terephthalic acid by a plurality of process steps including the catalyst oxidation of a dialkylbenzene compound, a second oxidation, a hydrogenation of...
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7173149 |
Process for preparing alkynecarboxylic acids by oxidation of alkyne alcohols
A process for preparing alkynecarboxylic acids includes the oxidation of an alkyne alcohol with a hypohalite in the presence of a nitroxyl compound at a pH of greater than 7 with continual addition...
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7132566 |
Process for the purification of a crude carboxylic acid slurry
Disclosed is a process to produce a purified carboxylic acid product. The process comprises removing impurities from a crude carboxylic acid slurry in a solid-liquid displacement zone to form a...
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7060853 |
Method for increasing oxidation reactor production capacity
The present invention relates to a method for increasing the production capacity of a conventional oxidation reactor for catalytic liquid phase oxidation of paraxylene by staging the oxidation...
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6949673 |
Process for producing carboxylic acids
Improved process for producing aromatic carboxylic acids by catalytic liquid phase oxidation of a corresponding precursor in a suitable solvent comprising feeding the reactants to a first oxidation...
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6759550 |
Oxidation of alkyl aromatic compounds to aromatic acids in an aqueous medium
The present invention pertains to an improved method of oxidizing substituted aromatic compounds (such as p xylene) to their corresponding aromatic acids (such as terephthalic acid). The...
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6747171 |
Low temperature purification of naphthalene dicarboxylic acids
A process for purifying a naphthalenic carboxylic acid comprising contacting at a temperature below about 575° F. a mixture comprising an impure naphthalenic carboxylic acid and a solvent in the...
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6730808 |
Oxidative reactions using membranes that selectively conduct oxygen
Reactor membranes for used in oxidation reactions of hydrocarbons involving oxygen comprising a selective oxidation catalyst on a mixed conducting, oxide ion selective ceramic membrane of the...
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6717009 |
Method for making high-purity naphthalenedicarboxylic acid
A high-purity naphthalenedicarboxylic acid is produced by a method including Steps [1] and [2]: In Step [I], a raw mixture of crude terephthalic acid and crude naphthalenedicarboxylic acid is...
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6689903 |
Crystallization method for production of purified aromatic dicarboxylic acids
Disclosed is a method for the recovery of crystalline terephthalic acid containing less than about 150 ppmw p-toluic acid by subjecting a solution of terephthalic acid containing minor amounts of...
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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...
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6657068 |
Liquid phase oxidation of halogenated ortho-xylenes
A method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful...
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6657067 |
Method for the manufacture of chlorophthalic anhydride
A method for the manufacture of chlorophthalic acid by liquid phase oxidation of chloro-ortho-xylene is disclosed. The chlorophthalic acid may be dehydrated to form chlorophthalic anhydride which...
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6649791 |
Process for the preparation of an aromatic carboxylic acid
The present invention relates to the preparation of an aromatic carboxylic acid by contacting an alkyl aromatic compound with an oxygen containing gas in the presence of a encapsulated oxo-bridged...
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6649773 |
Method for the manufacture of halophthalic acids and anhydrides
A method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful...
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6620966 |
Process for producing aromatic carboxylic acid
There is disclosed a process for continuously producing an aromatic carboxylic acid comprising the steps of (A) subjecting a poly-alkyl aromatic hydrocarbon to a liquid-phase oxidation by...
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6562997 |
Production of high purity aromatic carboxylic acid by oxidation in benzoic acid and water solvent
Processes for the production of aromatic carboxylic acids is disclosed. The aromatic acids are produced by the liquid phase oxidation of a suitable acid precursor in a reaction medium comprising...
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6485758 |
Hangover treatment
A cure for a hangover containing the active ingredient ephedrine in powdered form enclosed in a capsule. In a second embodiment this cure contains ephedrine and charcoal, while in a third...
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6458994 |
Process for producing aromatic polycarboxylic acid
A process for producing a polycarboxylic acid which comprises performing liquid phase oxidation of polyalkyl-substituted aromatic aldehyde and/or oxide derivative of polyalkyl-substituted aromatic...
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6255525 |
Process for preparing purified carboxylic acids
A process for preparing an aromatic carboxylic acid having improved purity comprising contacting at an elevated temperature and pressure a mixture comprising an impure aromatic carboxylic acid and...
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6127573 |
Oxidaton of primary alcohols to carboxylic acids with a TEMPO catalyst using NaClO.sub.2 and NaClO
The present invention relates to a TEMPO-catalyzed oxidation of primary alcohols, RCH 2 OH to corresponding carboxylic acids, RCOOH in the presence of catalytic in the presence of catalytic amount...
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6114575 |
Process for preparing 2,6-naphthalenedicarboxylic acid
A process for producing 2,6-naphthalenedicarboxylic acid by the liquid phase, exothermic oxidation of 2,6-dimethylnaphthalene comprising adding to a reaction zone oxidation reaction components...
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5895820 |
Process for the production of trimellitic acid and process for the production of trimellitic acid anhydride
A process for the production of a trimellitic acid by oxidizing dialkyl aromatic aldehyde and/or its oxide derivative in a liquid phase, the oxidation being carried out in a lower aliphatic...
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5847203 |
Bromine catalysed oxidation processes
In plant for the production and processing of an aromatic carboxylic acid such as terephthalic acid, at least some of the plant components (especially those exposed to an acidic reaction medium at...
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5770764 |
Process for preparing purified aromatic polycarboxylic acids
Economical processes are disclosed for preparing relatively pure polycarboxylic acid from typical crude products of liquid phase oxidation, which do not involve intermediate steps of ester...
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5763649 |
Process for producing aromatic carboxylic acids
A process for producing aromatic carboxylic acids by subjecting an aromatic compound having one or more substituent alkyl groups and/or partially oxidized substituent alkyl groups to a liquid phase...
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5756858 |
Process for the preparation of substituted phenylacetic acid derivatives and novel intermediates
The invention relates to novel processes for the preparation of phenyl acetic acid derivatives of the formula (I) some of which are known ##STR1## in which R 1 , R 2 and R 3 independently of each...
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