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8083903 |
Process for producing allyl alcohol
An azeotropic distillation method, comprising a reaction step, a distillation step for separating and refining a reaction product, and a recovery step for collecting a reactant after the...
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8007677 |
Azeotrope compositions comprising 1,1,1,2,3-pentafluoropropene and hydrogen fluoride and uses thereof
Disclosed herein are azeotrope and near-azeotrope compositions comprising E-1,1,1,2,3-pentafluoropropene (E-HFC-1225ye) and hydrogen fluoride. The azeotrope and near-azeotrope compositions are...
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7985867 |
Process for producing epoxides
A process for producing epoxides, the process including: (a) feeding at least one aqueous alkali and at least one halohydrin to a reactive distillation column, wherein the reactive distillation...
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7879198 |
Processes for the purification of trichlorosilane and silicon tetrachloride
The present disclosure relates to processes and systems for purifying technical grade trichlorosilane and/or technical grade silicon tetrachloride into electronic grade trichlorosilane and/or...
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7847140 |
Process for making higher olefins
A process is disclosed for making higher olefins by oligomerization of a lower olefin e.g ethylene, to higher olefins, using catalytic distillation conditions. Simultaneously and interdependently,...
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7754900 |
Method for the production of dioxolane
Processes comprising: providing a reactive distillation column having an upper region, a middle region and a lower region; feeding ethylene glycol and an aqueous formaldehyde solution into the...
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7304176 |
Process for producing easily polymerizable substance
It is an object of the present invention to provide a process for producing easily polymerizable substance, which can realize stable operation of a purification system, and can stably maintain a...
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7169268 |
Color stabilization of amines
The present invention concerns a process for providing tertiary amine products which are color-stable, and have a greatly reduced tendency to take on color during their storage. According to the...
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7157610 |
Process for recovering methanol
A process for recovering methanol from mixtures containing methanol and water, comprising multistage evaporation with heat integration, wherein the pressure is reduced from each stage to the next,...
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7128813 |
Process for manufacturing high purity methacrylic acid
A process for the high yield production of high purity glacial methacrylic acid (“HPMAA”) with minimization of decomposition of hydroxy isobutyric acid (HIBA). The HPMAA is substantially pure, spe...
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7048834 |
Method for purification of acrylic acid
The present invention provides an industrially easy and economical method for purification of acrylic acid which enables to efficiently eliminate impurities from a crude acrylic acid containing...
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6964728 |
Separation process
Bisphenol-A-bis(neopentylglycolphosphate) products of enhanced properties and processes for preparing them are described. One of the processes includes (a) mixing and reacting neopentyl glycol and...
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6849162 |
Method for the production of propylene oxide
A process for the preparation of propylene oxide in the presence of methanol, in which propylene oxide is separated from a mixture propylene oxide and methanol, and the resultant methanol...
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6790319 |
Method for recovering titanium compound, process for preparing titanium halide, and process for preparing catalyst for polymer production
A method for recovering a titanium compound includes bringing a waste solution containing a titanium alkoxide into contact with a halogenating agent to convert at least a part of the titanium...
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6632330 |
Process for purification of alkyl alkanoate
A process for the recovery of substantially pure alkyl alkanoate, such as ethyl acetate, from an impure feedstock. The impure feedstock is contacted with a selective hydrogenation catalyst in the...
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6554966 |
Process for preparing essentially formic acid-free N-alkyl-N′-methylalkyleneureas
The invention relates to a process for preparing essentially formic acid-free N-alkyl-N′-methylalkyleneureas of the formula with R1=H or CH3, R2=CnH2n+1 with n=1-4 and x=0 or 1, from the c...
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6491795 |
Process for recovering benzyl benzoate
High-purity benzyl benzoate is recovered by distilling the residue remaining after removal of unreacted toluene and benzoic acid from a reaction mixture produced by the oxidation of toluene by...
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6423189 |
Process for the preparation of 1,3-dichloropropane
A process for the preparation of 1,3-dichloropropane by reacting bis(3-hydroxypropyl)ether with hydrogen chloride, optionally in the presence of tertiary basic nitrogen compounds or other tertiary...
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6365413 |
Thin film thermal oxidative oil deposit testing device and method
Thin film thermal oxidative engine oil or other oleaginous liquid deposit device has an oleaginous test liquid placement volume; a heatable depositor surface in liquid communication with the...
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6337412 |
Three stage propylene oxide process
A three stage process for producing propylene oxide from propylene, oxygen, and hydrogen. The first reaction step is the oxidation of isopropanol/water with molecular oxygen in a...
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6262314 |
Process for preparation of ethers in a catalytic distillation column
A process for preparing ethers includes the steps of:providing a feedstock containing iso-olefins selected from the group consisting of C5 iso-olefins, C6 iso-olefins and mixtures thereof; mixing...
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6207022 |
Purification of crude (meth) acrylic acid
Crude (meth)acrylic acid is purified by a process in which a primary amine compound and an organic sulfonic acid are added to the crude (meth)acrylic acid and the latter is then worked up by...
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6179966 |
Method for producing acrylic acid
The present invention concerns a method for producing acrylic acid which involves subjecting an acrylic acid-containing aqueous solution obtained by catalytic vapor phase oxidation of propylene...
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6093845 |
Ester co-production
This invention relates to a process for the simultaneous co-production of ethyl acetate and n-butyl acetate. The process involves reacting a reaction mixture of ethanol, n-butanol and acetic acid...
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6074532 |
Adjunct for removal of aldehydes from chemical manufacturing production streams during distillative purification
A method for improving purification efficiency when distilling off aldehyde contaminants during chemical manufacturing processes by adding a substituted aromatic amine having electron donating...
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5993609 |
Process for the purification of phosphorus oxychloride
A process for the purification of recovered or regenerated phosphorus oxychloride contaminated by reactive organic compounds, by reacting the contaminated phosphorus oxychloride with from 0.1 to 5%...
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5951829 |
Separation of heteropoly compounds from polyethers, polyesters and polyether esters
A method of separating heteropoly compounds from mixtures of polyethers, polyesters and/or polyether esters, a protic component and heteropoly compounds, wherein the protic component is removed...
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5929292 |
Distillation column type production method
A production method which comprises reacting one or more feedstock compounds to form a desired compound having a boiling point higher than the feedstock compounds, wherein the reaction is carried...
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5902459 |
Recovery of products from toluenediisocyanate residues
There is now provided a method of recycling toluenediisocyanate residue resulting from the production of toluenediisocyanate by the reaction of toluenediamine by phosgenation in the presence of a...
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5817906 |
Process for producing light olefins using reaction with distillation as an intermediate step
The present invention relates to a process for the production of light olefins comprising olefins having from 2 to 4 carbon atoms per molecule from a crude oxygenate feedstock. The crude oxygenate...
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5759358 |
Process for pure grade acrylic acid
Processes are provided for producing a pure grade of acrylic acid having residual aldehyde levels under 10 parts per million. The processes apply selected groups of amines sequentially and,...
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5667644 |
Method for producing a dimerized aldehyde
A method for producing a dimerized aldehyde, which comprises subjecting a feed aldehyde to a condensation reaction and a dehydration reaction in the presence of a basic catalyst, wherein the feed...
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5653853 |
Method of removing iodine compounds from crude acetic anhydride
A process by which iodine compounds contained in crude acetic anhydride or a mixture of crude acetic anhydride and crude acetic acid can be converted into methyl iodide having a low boiling point...
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5605606 |
Removal foulants from distillation train using non-solvent precipitation
A method for the prevention of fouling in a distillation train of a hydrocarbon processing unit. The method involves the precipitation of foulants contained in the hydrocarbon fluid prior to...
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5571386 |
Process for grade acrylic acid
The invention provides a continuous process for producing a pure grade of acrylic acid having residual aldehyde levels under 10 parts per million. The process applies two groups of amines...
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5565069 |
Process for producing 5-vinyl-2-norbornene
A process for producing 5-vinyl-2-norbornene which comprises the steps of subjecting a liquid raw material in which tetrahydroindene/dicyclopentadiene ratio (by weight) falls within the range of...
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5554796 |
Removal of primary and secondary hydroperoxide impurities from tertiary hydroperoxides
A process for the purification of tertiary alkyl hydroperoxide containing contaminating quantities of primary and secondary alkyl hydroperoxides by contacting the impure hydroperoxide mixture with...
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5522971 |
Dry neutralization of olefinically reactive organic liquid phases
Pure, substantially neutral, low-volatile organic compounds including reactive double bonds are advantageously isolated from a liquid feedstock which contains said compounds in combination with...
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5516406 |
Process for purifying acids formed during liquid phase oxidation of butane
A method of purifying the oxidate product formed by the liquid phase oxidation of C4 -C8 paraffinic hydrocarbons comprises adding a strong acid catalyst to the oxidate product to catalyze the break...
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5512691 |
Process for the production of tocopherol concentrates
Disclosed is an improved process for the preparation of tocopherol concentrates from vegetable oil distillates. Tocopherol concentrates are obtained containing 20-80% tocopherol by weight, with an...
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5487817 |
Process for tocopherols and sterols from natural sources
A novel process for the recovery of tocopherols and sterols from natural, especially vegetable, sources. This process is especially a process for the separation of tocopherols and sterols from...
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5482597 |
Purification of crude (meth)acrylic acid
In a process for purifying crude (meth)acrylic acid, the crude (meth)acrylic acid is worked up by distillation after addition of an organic carboxylic acid hydrazide and, if desired, an organic...
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5468350 |
Apparatus for manufacturing ultrapure water
The apparatus includes a container for accommodating water to be treated and evaporating the water. Container is attached with water supply for supplying the water to be treated into the container....
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5423953 |
Process for recovering column bottom residues produced by fractional distillation of ethylene glycol
A process for recovering column bottom residues produced by distillation of ethylene glycol resulting from an aromatic polyester production process, involving treating the residues with an aromatic...
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5419815 |
Process for purifying fatty acid amides
The present invention relates to a process for purifying fatty acid amides, which contains the following process steps: neutralization of the fatty acid by addition of an aqueous alkaline solution...
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5395486 |
Dehydration process
Dehydrated compositions are obtained by: combining a hydrous composition, e.g., a hydrous electrolyte salt, with inert fluorochemical liquid; heating the resulting mixture in a vessel to volatilize...
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5370774 |
Process for isolating pure diketene with recovery of materials of value
The invention relates to a process for isolating pure diketene with recovery of materials of value by continuous, two-stage distillation of crude diketene at reduced pressure and with continuous...
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5344954 |
Process for the preparation of diaryl carbonates
Diaryl carbonates are prepared from dialkyl carbonates and phenolic compounds by transesterification in the presence of a transesterification catalyst at 60°-320° C. in an apparatus composed of t...
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5342487 |
Distillation process
A process for reducing the amount of unwanted di(meth)acrylate produced during the distillation of hydroxyalkyl acrylates or hydroxyalkyl methacrylates.
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5318673 |
Process for the purification of 1,1-dichloro-1-fluoroethane
Process for the purification of crude 1,1-dichloro -1-fluoroethane by treatment with chlorine in the presence of an organic free radical initiator and then distillation.
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