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3865696 |
Recovery of citraconic acid anhydride by isomerization and vacuum distillation
Citraconic acid anhydride is recovered from an aqueous solution containing citraconic and maleic acids by first isomerizing the maleic acid and removing the resulting solid fumaric acid. The...
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3846488 |
ACCELERATING SEPARATION RATE OF TWO LIQUID PHASES IN THE EXTRACTION OF AQUEOUS ACRYLIC ACID
This invention relates to the method of accelerating the separation of two layers, one being an organic solvent phase which contains an unsaturated organic acid, and the other being an aqueous...
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3844903 |
SEPARATING ALPHA, BETA-UNSATURATED CARBOXYLIC ACIDS FROM AQUEOUS SOLUTIONS BY AZEOTROPIC DISTILLATION WITH EXCESS SOLVENT
α,β-Unsaturated carboxylic acids which have been prepared by catalytic oxidation of the corresponding olefins bearing terminal double bonds or the corresponding α,β-unsaturated aldehydes with...
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3781193 |
PROCESS FOR ISOLATING ACRYLIC ACID FROM AQUEOUS CRUDE ACRYLIC ACID BY DISTILLATIONS WITH 3,3,5-TRIMETHYCYCLOHEXAMONE AND THIN LAYER EVAPORATION
Acrylic acid and acetic acid are isolated from aqueous crude acrylic acid containing acrylic acid and acetic acid and contaminated with minor proportions of formaldehyde and higher boiling...
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3769177 |
PURIFICATION OF CARBOXYLIC ACIDS BY PLURAL STAGE DISTILLATION WITH SIDE STREAM DRAW-OFFS
A process for the removal and recovery of halogen components and the drying of aqueous monocarboxylic acids, particularly those produced by the reaction of an alcohol or olefin and carbon monoxide...
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3732257 |
TRIMELLITIC ACID ANHYDRIDE PRODUCT RECOVERY BY STEAM STRIPPING CRUDE ANHYDRIDE OF TOTAL SOLIDS FROM PSEUDOCUMENE OXIDATION EFFLUENT AND CONTINUOUS FRACTIONATION OF STRIPPED PRODUCT
Fluid effluent from pseudocumene oxidation with molecular oxygen in the presence of acetic acid as reaction medium under liquid phase conditions or concentrate thereof is subject to simultaneous...
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3721610 |
PROCESS FOR THE SEPARATION OF LACTIC ACID FROM WATER AND NITRIC ACID BY RAPID PREEVAPORATION AND DISTILLATION
Lactic acid is recovered from aqueous mixtures containing it together with nitric acid, e.g. obtained by hydrolysis of the oxidation product of propylene with nitric acid, by passing the mixture...
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3718545 |
DISTILLATION PROCESS FOR RECOVERING SUBSTANTIALLY ANHYDROUS FORMIC ACID FROM AQUEOUS SOLUTIONS
Substantially anhydrous formic acid is recovered from aqueous solution by azeotropically distilling the solution with a non-aromatic hydrocarbon entrainer which boils between about 60° and 120°...
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3689541 |
PROCESS FOR ISOLATING ACRYLIC ACID FROM AQUEOUS CRUDE ACRYLIC ACID BY EXTRACTION WITH A KETONE AND PLURAL STAGE DISTILLATION
Pure acrylic acid is isolated from an aqueous crude acid containing acrylic acid together with minor proportions of acetic acid, formaldehyde and high boilers boiling at a temperature higher than...
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3663375 |
SEPARATION OF COMPONENTS FROM A REACTION PRODUCT MIXTURE OF WATER ISOBUTYRIC ACID AND METHACRYLIC ACID BY PHASE SEPARATION AND DISTILLATIONS
To separate aqueous and organic components of a mixture of isobutyric acid, water and methacrylic acid, the mixture is initially separated by salting out by means of a water soluble electrolyte...
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3632482 |
PROPYLENE OXIDE RECOVERY FROM PROPYLENE BY EXTRACTIVE DISTILLATION WITH AN ALCOHOL-KETONE-HYDROCARBON SOLVENT
Propylene oxide and propylene are separately recovered from a crude propylene oxide, produced by catalytic epoxidation of propylene with an organic hydroperoxide, and containing propylene oxide in...
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3528925 |
ENCAPSULATED SYNTHETIC LIQUID DETERGENT AND PROCESS FOR PREPARING THE SAME
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3527677 |
PROCESS FOR DEHYDRATION OF AQUEOUS ACRYLIC ACID SOLUTIONS BY EXTRACTIVE - AZEOTROPIC DISTILLATION WITH 2-ETHYLHEXANOL OR 2-ETHYLHEXYLACRYLATE
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3507840 |
METHOD OF REMOVING WATER FROM WATER-SOLUBLE POLYMERS
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3476775 |
RECOVERY OF MALEIC ANHYDRIDE BY PLURAL STAGE THIN LAYER VACUUM EVAPORATION AND PLURAL STAGE CONDENSATION
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3438870 |
PROCESS FOR THE CONTINUOUS RECOVERY OF VINYL ESTERS AND CARBOXYLIC ACIDS BY AZEOTROPIC DISTILLATION
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3433831 |
SEPARATION AND PURIFICATION OF ACRYLIC ACID FROM ACETIC ACID BY SOLVENT EXTRACTION AND AZEOTROPIC DISTILLATION WITH A TWO COMPONENT SOLVENT-ENTRAINER SYSTEM
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3432401 |
PROCESS FOR PRODUCTION OF GLACIAL ACRYLIC ACID BY AZEOTROPIC DISTILLATION WITH A WATER ENTRAINER
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3414485 |
Process for drying methacrylic acid by extraction and azeotropic distillation
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3394058 |
Separation of formic acid and water from acetic acid by distillation with an entraine
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3359283 |
Recovery of dicarboxylic acid anhydrides from aqueous acid solution
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3357899 |
Method of recovering formic acid from a waste liquor
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3344178 |
Acrylic acid concentration by extraction and distillation with a solvententrainer
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3312602 |
Separation of linear aliphatic monoolefins from hydrocarbons by distilling with a nitrile
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3281450 |
Purification of acetonitrile
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3094539 |
Preparation of aliphatic dicarboxylic acid anhydrides
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3040094 |
Recovery of aliphatic acids from black liquor
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2942006 |
Preparation of maleic anhydride by azeotropic distillation of maleic acid
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2831869 |
Stabilization and recovery of dicarboxylic acid anhydrides in the presence of alkalimetal cations
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2802025 |
Process for the production of lower carboxylic peracids
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2801265 |
Dehydration of volatile fatty acids through solvents
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3791935 |
Title is not available
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3658895 |
Title is not available
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3663613 |
Title is not available
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3798264 |
Title is not available
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3743672 |
Title is not available
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3666632 |
Title is not available
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3642829 |
Title is not available
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3597330 |
Title is not available
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3657280 |
Title is not available
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3637761 |
Title is not available
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3657332 |
Title is not available
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