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| Number | Title | Issue Date |
| 4661208 | Method for dehydrating distillation of an aqueous solution of carboxylic acid The invention provides a means for greatly saving the thermal energy consumption in the dehydrating distillation of an aqueous solution of a carboxylic acid such as acetic acid by use of an azeotropically distilling entrainer boiling at a lower temperatur... | 04/28/1987 |
| 4642166 | Dehydration of formic acid by extractive distillation Formic acid cannot be completely removed from formic acid - water mixtures by distillation because of the presence of the maximum azeotrope. Formic acid can be readily removed from mixtures containing it and water by using extractive distillation in which... | 02/10/1987 |
| 4599144 | Process for recovery of methacrylic acid Process is disclosed for treating the reaction product of propionic acid and formaldehyde to recover methacrylic acid from an aqueous effluent wherein said effluent contains methacrylic acid, unreacted formaldehyde, unreacted propionic acid, water and by-... | 07/08/1986 |
| 4576683 | Method for separating carboxylic acids from mixtures with non-acids A method for separating carboxylic acids from mixtures with non-acids by an extractive distillation method using a lactam with a 5- or 6-membered ring, preferably N-methyl-2-pyrrolidone, as an extractant to extract the acids from the mixture with non-acid... | 03/18/1986 |
| 4554054 | Methacrylic acid separation A process to recover acrylic acid or methacrylic acid by using a split quench process which allows acrylic acid or methacrylic acid to be recovered from the resulting aqueous solutions by a combination of solvent extraction and azeotropic dehydration that... | 11/19/1985 |
| 4518462 | Distillation process for purifying methyl methacrylate In purifying methyl methacrylate by feeding a feed mixture containing methanol, methyl methacrylate and 0.05 to 2% by weight, based on the weight of the methyl Methacrylate, of methyl isobutyrate to a first distillation column, subjecting the same to dist... | 05/21/1985 |
| 4450047 | Process for recovering anhydrous alkanesulfonic acids by reduced pressure, falling film evaporation Water is removed from methanesulfonic acid to produce an anhydrous product of high purity by spraying wet methanesulfonic acid (MSA) onto the walls of a vertical, heated tube which is maintained at reduced pressure. The water evaporates as the acid flows ... | 05/22/1984 |
| 4444881 | Recovery of organic acids from a fermentation broth A process is provided for the recovery of organic acids from dilute aqueous solutions. The acid in the form of its calcium salt is treated with a tertiary amine carbonate and the resulting trialkylammonium salt of the acid is isolated and heated to give t... | 04/24/1984 |
| 4401514 | Method for the recovery of furfural, acetic acid and formic acid A method of recovering or extracting chemicals, such as furfural, formic acid, acetic acid and other organic compounds from acidic hydrolysates of plants or vegetable matter, especially spent sulfite liquors after conversion of the pentosans into pentoses... | 08/30/1983 |
| 4365080 | Production of dimethyl esters This invention provides an improved process for the separation and recovery of byproducts associated with the isolation of C4 -C6 dicarboxylic acids contained in a waste byproduct stream derived from an adipic acid manufacturing oper... | 12/21/1982 |
| 4344897 | Process for the preparation of percarboxylic acid solutions In a process for the continuous preparation of pure organic solutions of percarboxylic acids having 2 to 5 carbon atoms, by (a) contacting aqueous hydrogen peroxide with a carboxylic acid containing 2 to 5 carbon atoms in the presence of an acid catalyst at a ... | 08/17/1982 |
| 4339596 | Treatment of byproduct stream from adipic acid manufacture In one embodiment, this invention provides a process for converting a dilute aqueous filtrate byproduct stream from adipic acid manufacture into a concentrated methanolic solution which does not solidify at ambient temperatures. In another embodiment, thi... | 07/13/1982 |
| 4269666 | Recovery of acrylic acid by reversal of acrylic acid/water relative volatility An aqueous solution of acrylic acid and water containing 30 wt. % or less acrylic acid, can be concentrated to 40-60 wt. % acrylic acid in the overhead of a distillation column through the addition of certain salts that reverse the relative volatility bet... | 05/26/1981 |
| 4262140 | Production of anhydrous or substantially anhydrous formic acid A process for the production of anhydrous or substantially anhydrous formic acid by hydrolysis of methyl formate which is carried out in a column having an upper fractionating section, a middle hydrolysis section and a lower extraction section and in whic... | 04/14/1981 |
| 4230887 | Recovery of anhydrous acids C2 -C6 monocarboxylic and dicarboxylic acids are scrubbed from gas phase mixtures of such acids and water by gas absorption techniques utilizing a liquid solvent comprising a polyoxyalkylene glycol or a monoalkyl or dialkyl ether the... | 10/28/1980 |
| 4076594 | Purification of formic acid by extractive distillation Formic acid is purified by extractive distillation of its aqueous solutions using a basic extractant, followed by distillation of the bottom mixture first obtained, the extractant used being N-formylmorpholine.... | 02/28/1978 |
| 4039428 | Purification of propionic acid A process is provided for producing ultra-pure propionic acid, i.e., acid containing less than 20 parts by weight of iodine per billion parts by weight of acid, wherein crude acid containing water and iodine contaminants is distilled in a single distillat... | 08/02/1977 |
| 4035242 | Distillative purification of alkane sulfonic acids Aqueous solutions of methane sulfonic acid are dehydrated and purified in a two-step fractionation process.... | 07/12/1977 |
| 3989600 | Distilling H2 O from aromatic carboxylic acid at a pH exceeding 9 A process for treating an aqueous solution containing organic compounds and having a high chemical oxygen demand (COD) by distilling the aqueous solution at a pH not lower than 9, and recovering the water of low chemical oxygen demand (COD) from said aque... | 11/02/1976 |
| 3983010 | Recovery of the formic acid/water azeotrope by distillation Formic acid is isolated from mixtures containing formic acid, methyl formate, methanol and water by fractional distillation, the mixture being fed into the upper half of the distillation column and 5 to 15 theoretical plates being maintained above the fee... | 09/28/1976 |
| 3968153 | Extraction of acrylic acid and/or methacrylic acid with a solvent mixture of methylethylketone and xylene or ethylbenzene A method for extraction of acrylic acid and/or methacrylic acid from a solution containing the same by treating the said solution with an organic solvent, which is characterized by using a mixture of methylethylketone and a xylene as the organic solvent. ... | 07/06/1976 |
| 3957830 | Manufacture of succinic anhydride Process for the manufacture of succinic anhydride by eliminating water from succinic acid using a chemically inert hydrophilic solvent which does not form an azeotropic mixture with water, and fractional distillation.... | 05/18/1976 |
