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8354007 |
Method for producing and purifying trifluoromethanesulfinic acid
The invention relates to a process for purifying trifluoromethanesulfinic acid by azeotropic distillation with an aromatic solvent, to processes for preparing purified trifluoromethanesulfinic... |
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8337671 |
Method for purifying polymerizable compounds
Process for distillatively purifying polymerizable compounds using a high-boiling, inert, thermally long-term-stable substance as a boiling oil, characterized in that the boiling oil is disposed... |
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8323456 |
Removal of bound water from bio-oil
A process and system for removing bound water from bio-oil by azeotropic distillation. The process includes combining a bound-water-containing bio-oil with an azeotrope agent and subjecting the... |
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8172987 |
Low-energy extractive distillation process for dehydration of aqueous ethanol
An energy-efficient extractive distillation process for producing anhydrous ethanol from aqueous/ethanol feeds containing any range of ethanol employs an extractive distillation column (EDC) that... |
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7550065 |
Method for recovering solvents
A method for recovering a solvent from its mixture containing oligomers extracted from grafted polyolefins is disclosed. The method includes distilling the solvent from the mixture in the presence... |
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7371309 |
Purification of difluoromethane by extractive distillation
The present invention provides extractive distillation processes for removing difluoromethane (HFC-32) from a mixture comprising HFC-32 and at least one of chlorodifluoromethane (CFC-12),... |
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7037412 |
Method for preparing deodorized N-vinyl-2-pyrrolidone
The invention provides a method for producing purified N-vinyl-2-pyrrolidone free of odorous components. The method is composed of distilling with a distillation column a liquid, which is formed... |
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6984293 |
Azeotropic distillation of cyclic esters of hydroxy organic acids
Cyclic esters of hydroxy organic acids can be produced and recovered via azeotropic distillation. In certain embodiments cyclic esters, such as glycolide and lactide, can be produced from a... |
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6982026 |
Azeotropic distillation process for producing organic acids or organic acid amides
Disclosed herein are methods for the recovery of at least one of an organic acid or an organic acid amide, such as a heat stable lactic acid or lactamide, from a feed stream which contains the... |
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6926810 |
Process for obtaining an organic acid from an organic acid ammonium salt, an organic acid amide, or an alkylamine organic acid complex
Disclosed herein are methods for the recovery of an organic acid, such as a heat stable lactic acid, from a feed stream which contains at least one of an organic acid amide, an organic acid... |
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6787001 |
Method for distilling (meth) acrylic acid solution
A method for distilling a raw material liquid containing (meth)acrylic acid substantially free from azeotropic solvents, collected with a collection agent from a mixed gas obtained by gas phase... |
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6461481 |
Process for removing water from organoborane compounds
A method of removing water from wet organoborane by dissolving the wet organoborane in an organic solvent in which water is incompletely soluble, decanting any insoluble water, and distilling the... |
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6444096 |
Process for the recovery and purification of cyclobutanone
A process for the recovery and purification of cyclobutanone from a crude product mixture obtained from an oxidation product mixture resulting from the oxidation of cyclobutanol to cyclobutanone... |
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6352618 |
Modular solvent recovery device
A process is disclosed for manufacturing a concentrated residue from a photopolymer fluid which includes photopolymer and photopolymer solvent. The photopolymer fluid may be derived by chemically... |
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6299737 |
Recovery of glycols from used glycol-containing technical fluids
A process for recovering glycols from used glycol-containing technical fluids, especially from used antifreeze comprises adding to the used glycol-containing technical fluids an organic solvent... |
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6166270 |
Extractive distillation separation
High purity tertiary butyl alcohol is obtained from mixtures comprised of tertiary butyl alcohol and tertiary butyl acetate by extractive distillation using a hydrocarbon extractive solvent such... |
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6159345 |
Method and apparatus for recovering and/or recycling solvents
A method and apparatus for recycling and recovering potentially explosive solvents includes providing a contaminated solvent to a distillation tank, vaporizing the solvent in the distillation... |
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6120652 |
Method for purifying crude 1,1,1,3,3-pentafluoropropane
The invention relates to a method for purifying a crude 1,1,1,3,3-pentafluoropropane (HFC-245fa) containing HFC-245fa and 1-chloro-3,3,3-trifluoro-trans-1-propene (HCFC-1233zd(t)), by... |
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6042697 |
Separation of 9,11-Diene C18 fatty acid from 10,12-Diene C18 fatty acid by azeotropic distillation
9,11- Diene C18 fatty acid cannot be separated from 10,12-Diene C18 fatty acid by conventional rectification because of the proximity of their boiling points. 9,11-Diene C18 fatty acid can be... |
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6039846 |
Separation of 3-methyl-2-pentenal from n-butanol by azeotropic distillation
3-Methyl-2-pentenal cannot be separated from 1-butanol by conventional rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol... |
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6024841 |
Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by extractive distillation
2-Methyl-1-butanol and 3-methyl-1-butanol are difficult to separate from 1 pentanol by conventional distillation or rectification because of the proximity of their boiling points.... |
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6004435 |
Separation of cumene from 3-ethyl toluene by azeotropic distillation
Cumene cannot be separated from 3-ethyl toulene by distillation because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are methyl... |
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5993610 |
Separation of ethyl acetate from ethanol by azeotropic distillation
Ethyl acetate cannot be separated from ethanol by distillation or rectification because of the closeness of their boiling points. Ethyl acetate is readily separated from ethanol by azeotropic... |
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5964987 |
Neutral oil removal from natural cresylic acid mixtures
Natural cresylic acid is processed to remove neutral oil impurities by countercurrent liquid/liquid extraction using a heavy phase solvent of a mixture of glycerol and another polyhydric alcohol,... |
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5908538 |
Separation of T-amyl alcohol from 2- methyl-1 -propanol azeotropic distillation
2-Methyl-1-propanol cannot be separated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Methyl-1-propanol is readily separated from t-amyl... |
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5897750 |
Separation of acetone from isopropanol-water mixtures by extractive distillation
Acetone cannot be separated from a mixture of isopropanol and water because of the closeness of their boiling points. Acetone can be easily separated from isopropanol and water by extractive... |
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5882485 |
Process for the separation of dimethyl ether and chloromethane in mixtures
A process for the separation of dimethyl ether and chloromethane in mixturesA process for the separation of dimethyl ether and chloromethane in mixtures by two distillation steps. In the first... |
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5879517 |
Method for separating 2-butanol from t-amyl alcohol using certain organic compounds as the agent in extractive distillation
2-Butanol cannot be sparated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from t-amyl alcohol by extractive... |
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5876569 |
Separation of methyl ethyl ketone from ethanol by extractive distillation
Methyl ethyl ketone cannot be separated from ethanol by distillation or rectification because of the closeness of their boiling points. Methyl ethyl ketone is readily separated from ethanol by... |
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5840160 |
Separation of 3-carene from limonene by extractive distillation
3-Carene is difficult to separate from limonene by conventional distillation or rectification because of the proximity of their boiling points. 3-Carene can be readily separated from limonene by... |
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5834585 |
Method for the separation of hexamethylcyclotrisiloxane
A method for separating hexamethylcyclotrisiloxane that does not require the use of a distillation set up adapted for use with solids and that collects the hexamethylcyclotrisiloxane in the form... |
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5800681 |
Separation of ethanol, isopropanol and water mixtures by extractive distillation
Ethanol, isopropanol and water cannot be separated from each other by distillation or rectification because of minimum azeotropes. They are readily separated by extractive distillation. Effective... |
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5795447 |
Separation of 2-butanol from isobutanol by extractive distillation
2-Butanol cannot be separated from isobutanol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from isobutanol by extractive... |
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5779862 |
Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by azeotropic distillation
2-Methyl-1-butanol and 3-methyl-1-butanol are difficult to separate from 1-pentanol by conventional distillation or rectification because of the proximity of their boiling points.... |
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5776321 |
Separation of t-amyl alcohol from 1-propanol by azeotropic distillation
1-Propanol cannot be separated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 1-Propanol is readily separated from t-amyl alcohol by... |
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5776322 |
Separation of 4-methyl-2-pentanol from 3-methyl-1-butanol by azeotropic distillation
4-Methyl-2-pentanol cannot be separated from 3-methyl-1-butanol by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanol can be easily separated from... |
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5772853 |
Separation of 1-propanol from t-amyl alcohol by extractive distillation
1-Propanol and t-amyl alcohol cannot be separated by distillation or rectification because of the closeness of their boiling points. 1-Propanol is readily separated from t-amyl alcohol by... |
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5762764 |
Purification of acetone
Close boiling hydrocarbon impurities are separated from acetone by extractive distillation using a C9 -C14 alkane and/or a C8 -C12 aromatic hydrocarbon extractive distillation solvent. |
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5738763 |
Separation of 2-methyl-1-propanol from 2-methyl-1-butanol by extractive distillation
2-Methyl-1-propanol is difficult to separate from 2-methyl-1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be... |
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5723024 |
Separation of 2-methyl-1-propanol from 1-butanol by extractive distillation
2-Methyl-1-propanol is difficult to separate from 1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be readily... |
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5723025 |
Separation of 2-methyl-1-propanol from 2-butanol by extractive distillation
2-Methyl-1-propanol is difficult to separate from 2-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be readily... |
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5718809 |
Separation of t-amyl alcohol from 2-methyl-1-propanol by extractive distillation
T-Amyl alcohol and 2-methyl-1-propanol are difficult to separate by conventional distillation or rectification because of the proximity of their boiling points. T-Amyl alcohol can be easily... |
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5716499 |
Separation of 2-methyl-1-propanol from 1-butanol by azeotropic distillation
2-Methyl-1-propanol is difficult to separate from 1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be easily... |
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5660690 |
Method for distilling hexamethylcyclotrisiloxane
The invention relates to an improved distillation method wherein hexamethylcyclotrisiloxane is isolated from a crude blend thereof by mixing the crude blend with a hydrocarbon co-solvent having a... |
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5659095 |
Composition for inhibiting the polymerization of aromatic vinyl monomers
A polymerization inhibitor composition for inhibiting the polymerization of aromatic vinyl monomers at elevated temperatures comprising:(a) a benzofuroxan derivative of the formula ##STR1##... |
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5658436 |
Separation of 2-methyl-1-butanol from 3-methyl-1-butanol by extractive distillation
2-Methyl-1-butanol is impossible to separate from 3-methyl-l-butanol because they both boil at 130° C. 2-Methyl-1-butanol can be readily separated from 3-methyl-1-butanol by extractive... |
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5645695 |
Separation of 2-methyl-1-propanol from 2-methyl-1-butanol by azeotropic distillation
2-Methyl-1-propanol is difficult to separate from 2-methyl-1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be... |
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5501776 |
Process for the regeneration of a desiccant
For the regeneration of a liquid desiccant, a stripping agent is used which is liquid at ambient temperature and pressure, and forms a heteroazeotrope with water, along with the following steps:... |
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5453166 |
Separation of ethanol from 2-butanone by extractive distillation
Ethanol is impossible to separate from 2-butanone by conventional distillation or rectification because of the minimum boiling azeotrope between these two. Ethanol can be readily separated from... |
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5447608 |
Separation of 2-pentanol, 3-methyl-2-butanol and 1-butanol by azeotropic distillation
3-Methyl-2-butanol, 2-pentanol and 1-butanol are difficult to separate by conventional distillation or rectification because of the proximity of their boiling points. Mixtures of these three can... |