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7452448 |
Fat producing method
A method for producing a fat by distillation and purification while preventing isomerization. The distillation and purification is conducted under an acidic condition to prevent isomerization.
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7416645 |
Continuous process for recovering acetone from a waste stream resulting from acetone purification
The present invention provides a continuous process for recovering acetone from a waste stream from an acetone purification stage. The waste stream contains mesityl oxide and optionally acetone....
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7074304 |
Process for purifying alicyclic alcohols
A process for purifying alicyclic alcohols by distillation, wherein the alicyclic alcohols are distilled in the presence of from 1 to 550 ppm of acidic compounds.
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6668947 |
Drill cutting treatment method
A method and apparatus for treating for disposal oil-contaminated clay substrates such as drill cuttings from drilling with an oil-based mud. If necessary, the substrate is pretreated with an...
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6666973 |
Method for fixing fluorine and phosphorus in waste water containing fluorophosphoric acid-derived compound to remove them
A method is provided for fixing and eliminating fluorine and phosphorus in waste water wherein the waste water includes a fluorophosphate compound in which hydrochloric acid is added to the waste...
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6638398 |
Methods for the evaporation of an aqueous solution containing ammonia
A method including evaporating aqueous solutions containing ammonia, adding an acid to the evaporated vapor flow to form an ammonium salt, and condensing the vapor flow to form a liquid containing...
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6464838 |
Process for the recovery of compounds present in the heavy products after their preparation
A process for the recovery of compounds present in a mixture containing residues of heavy products is provided. The process includes conducting a reaction and distillation to obtain the compounds...
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6274726 |
Pressure-enhanced extraction and purification
The invention is based on the discovery that hyperbaric, hydrostatic pressure reversibly alters the partitioning of biomolecules between certain adsorbed and solvated phases relative to...
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6166232 |
Process for producing ester quats
A process is described for producing ester quats of the formula (I) ##STR1## where X - is an anion of an inorganic or organic acid, R a is a C 1 to C 4 alkyl group, R b and R c are each,...
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6111096 |
Nucleic acid isolation and purification
The invention is based on the discovery that hyperbaric, hydrostatic pressure reversibly alters the partitioning of nucleic acids between certain adsorbed and solvated phases relative to...
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5989394 |
Process for treatment of a contaminated liquid
A process for purification treatment of an impure liquid, such as a contaminated condensate, obtained when producing paper or paper pulp. The liquid is introduced intro a stripper device at an...
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5900125 |
Continuous preparation of alkyl esters of (meth)acrylic acid and apparatus for this purpose
In a process and an apparatus for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid and monohydric alkanols of 1 to 8 carbon atoms in the homogeneous,...
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5693190 |
Recovery of glycols from used antifreeze compositions by distillation
A method for the recovery of glycols from used antifreeze compositions by distillation entails the used antifreeze composition being treated before and/or during its distillation with an effective...
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5637777 |
Process and apparatus for preparing tertiary alkyl ether
The invention concerns a process and an apparatus for preparing tertiary ethers. According to the process, C 4 to C 6 isoolefins and possibly heavier olefins contained in the feedstock are...
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5635035 |
Surface improved tower packing
Etching the surfaces of a metal tower packing improves their wettability and therefore their efficiency in mass transfer applications.
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5620567 |
Process for the removal of aldehydes and acetals from industrially prepared acetic acid
A process for the removal of aldehydes and acetals from industrially prepared acetic acid, wherein the contaminated acetic acid is reacted in the presence of a Bronstedt acid and 0.05 to 1% by...
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5587056 |
Separation of aliphatic diacids from adipic acid admixtures thereof
At least a fraction of at least one branched, saturated aliphatic diacid having 6 carbon atoms, for example 2-methylglutaric acid and/or 2-ethylsuccinic acid and/or dimethylsuccinic acid, is...
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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 C 4 -C 8 paraffinic hydrocarbons comprises adding a strong acid catalyst to the oxidate product to catalyze the...
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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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5458740 |
Process for the purification of crude caprolactam
A process for the purification of caprolactam from crude caprolactam by distilling the crude caprolactam in the presence of an anorganic or organic acid.
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5346594 |
Process for the purification of 1,1-dichloro-1-fluoroethane
A process for purification of crude, 1,1-dichloro-1-fluoroethane includes the steps of treating a mixture of crude, 1,1-dichloro-1-fluoroethane and hydrogen fluoride with chlorine in the presence...
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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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5316627 |
Process for producing odorless dimethyl ether
This invention relates to a process for producing odourless dimethyl ether (DME) which is thus an excellent propellant. This dimethyl ether is produced from methanol, the methanol feed, prior to...
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5300198 |
Process for the separation of ethylidene diacetate from acetic anhydride
A distillation process for the separation of acetic anhydride from a mixture thereof with ethylidene diacetate wherein the mixture of acetic anhydride and ethylidene diacetate is fed to the mid...
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5284987 |
Preparation of a dimethyltetralin in a distillation reactor
A method for the acid catalyzed cyclization of an alkenylbenzene feedstock to a dimethyltetralin in a liquid phase reaction wherein the desired dimethyltetralin is removed from the reaction mixture...
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5264084 |
Process for separating off alkenes during methylchlorosilane distillation
A process for separating alkenes from a methylchlorosilane mixture by adding at least a stoichiometric amount of hydrogen chloride necessary for saturating the alkenes in the methylchlorosilane...
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5250155 |
Process for refining soap-containing crude polyol fatty-acid polyester reaction products
A process for refining soap-containing crude polyol fatty-acid polyester reaction product, the process including one or more high-temperature refining treatments and as the first step in the...
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5236557 |
Process for purification of aqueous solutions containing hydrogen sulfide, hydrogen cyanide, and ammonia
Aqueous solutions which are contaminated by hydrogen sulfide, hydrogen cyanide, and ammonia are brought to a pH of about 3 or less after their formation and treated with an inert gas in a stripping...
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5227028 |
Process for treating amides
A process of treating a ketoxime or aldoxime-containing amide mixture resulting from a Beckmann rearrangement of the corresponding ketoxime or aldoxime. The process involves hydrolysis of the...
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5225049 |
Process for refining organic-solvent containing crude polyol fatty-acid polyester products
A process for refining organic-solvent containing crude polyol fatty-acid polyester reaction product, including the steps of distilling the crude reaction product to substantially remove the...
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5194122 |
Method for recovering volatile, organic compounds from manure
A method for recovering volatile, organic compounds from manure, by: i) acidifying and concentrating the manure; ii) condensing the formed vapor; and iii) separating the volatile, organic...
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5190618 |
Production of high concentration tocopherols and tocotrienols from palm-oil by-products
A process for the production of tocopherols (T) and tocotrienols (T3) from palm fatty acid distillates (PFAD). The process includes converting free fatty acids and glycerides in PFAD into alkyl...
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5094720 |
Process for the distillative purification of citral
A method is disclosed for enhancing the purification of citral by fractional distillation by inhibiting the formation of isocitrals from isomerization of citral during the distillation process. The...
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5064507 |
Distillation process for recovery of high purity phenol
High purity phenol is obtained from cleavage of cumene hydroperoxide by treating the crude phenol product stream in a first treatment zone with an amine, a coarse distillation to obtain an overhead...
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4990320 |
Process for purifying hydrogen fluoride
A process for preparing hydrogen fluoride that involves treating anhydrous hydrogen fluoride containing primarily trivalent arsenic impurities with an iodine compound capable of providing iodide...
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4946029 |
Purification of carboxylic esters which contain aldehydes, acetals and/or unsaturated compounds
Carboxylic esters obtained by reacting olefinically unsaturated compounds with carbon monoxide and alcohols and containing aldehydes, acetals and/or unsaturated compounds are purified by (a)...
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4832920 |
Olefin fractionation and catalytic conversion system
A continuous catalytic system for converting an olefinic feedstock comprising ethylene and C 3 + olefins to heavier liquid hydrocarbon product comprising apparatus for (a) prefractionating the...
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4755262 |
Method for purification of glycidyl acrylate or glycidyl methacrylate
This invention relates to a method for the purification of glycidyl acrylate or glycidyl methacrylate. Specifically, the invention effects the purification by using a residual catalyst-inactivating...
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4634796 |
Production of high purity phenol
Phenol feed to a steam distilling column, containing alpha-methylstyrene and mesityl oxide, is treated with a base, without acidification, and the heavy phenol product is acidified and distilled in...
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4569725 |
Separation of a C.sub.4 -hydrocarbon mixture essentially containing n-butenes and butanes
A C 4 -hydrocarbon mixture which essentially contains n-butenes and butanes is separated by a process in which the mixture is reacted with a carboxylic acid in the presence of an acidic...
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4496760 |
Process of decomposition of a complex of ortho-benzoyl benzoic acid, hydrogen fluoride and boron trifluoride
A process for the decomposition of complexes of ortho-benzoyl benzoic acids, hydrogen fluoride, and boron trifluoride, whether or not the ortho-benzoyl benzoic acid is substituted, is disclosed...
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4448643 |
Isolation of isobutene from C.sub.4 -hydrocarbon mixtures containing isobutene
A process for isolating isobutene from C 4 -hydrocarbon mixtures containing isobutene by reacting the mixture with a primary alcohol in the presence of an acid condensing agent, to form the...
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4395311 |
Preparation of aminomethanols
Crude aminomethanols are converted to salt form by the addition of a strong acid and subsequently distilled under vacuum. The resulting purified aminomethanol is essentially free of unreacted...
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4381221 |
Process for recovering a reaction product while preventing decomposition of the catalyst
In a process for recovering an aliphatic carboxylic acid and/or an ester thereof by distilling a liquid mixture containing the aliphatic carboxylic acid and/or the ester thereof and a catalyst of a...
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4360407 |
Process for removing glycerine
The distillative separation of a mixture of glycerine and glycerine-based acetal or ketal transesterification products is aided by addition of a borate ester-forming compound to the mixture prior...
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4336109 |
Method for the recovery of acetone
Acetone having a markedly low content of aldehydes is recovered from an aqueous rectification residue brought about by rectification of crude acetone carried out after one crude acetone having been...
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4306943 |
Purification of polyether-polyol
Crude liquid polyether-polyols containing an alkaline catalyst are purified by the steps of: neutralizing said crude liquid polyether-polyol with a mineral acid having a dissociation constant of...
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4264501 |
Process for the recovery of pyrrolidone-2
A process is described for the recovery of 2-pyrrolidone monomer from polypyrrolidone waste material by heating the latter in the presence of a small amount of strong acid, and distilling off the...
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4260461 |
Vapor compression distillation apparatus and method
A vapor compression distillation apparatus and method are provided wherein scaling tendencies are eliminated. The raw feedwater has acid added to it in an amount sufficient to convert the...
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4257851 |
Purification of naphthoquinone
A crude naphthoquinone produced by an oxidation of naphthalene is purified by a reduced pressure distillation of a crude 1,4-naphthoquinone having an acid content of less than 5 equivalent %...
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