| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 568410000 | Purification or recovery | 6 |
| 20150291497 | METHOD FOR EXTRACTING ASYMMETRIC B-DIKETONE COMPOUND FROM B-DIKETONE COMPOUND - The present invention provides a method of extracting an asymmetric β-diketone compound from a β-diketone compound containing at least one symmetric β-diketone compound mixed in the asymmetric β-diketone compound, and the method includes the step (A) of adjusting a pH of a mixed solution of the β-diketone compound and water at 11.5 or more and dissolving the β-diketone compound into water to form a β-diketone compound solution and the step (B) of subsequently adjusting the pH of the β-diketone compound solution at 9.5 or less and recovering the asymmetric β-diketone compound of Chemical Formula 1 separated from the β-diketone compound solution. The present invention further includes at least either (a) a step of setting the upper limit of the pH of the mixed solution to 12.5 to form a β-diketone compound solution in the step (A) and bringing the β-diketone compound solution into contact with a hydrophobic solvent or (b) a step of setting the lower limit of the pH of the β-diketone compound solution to 8.0 in the step (B). | 10-15-2015 |
| 568411000 | Acetone or haloacetone purified or recovered | 5 |
| 20100145103 | METHOD FOR PURIFYING ACETONE - A method for purifying a crude acetone raw material containing low molecular weight impurities using three columns in sequence is disclosed. The method comprises the steps of feeding the crude acetone raw material into a first column; adding an alkaline reagent and an oxidative reagent into the first column; feeding the first bottom fraction to a second rectification column; optionally adding an alkaline reagent to the second column above the charge point of the bottom fraction; separating a purified acetone from the high molecular weight impurities and removing the purified acetone as a top fraction by distillation in the second column, thereby forming a second bottom fraction comprising an acetone mixture comprising high molecular weight impurities; feeding the second bottom fraction comprising the acetone mixture to a third rectification column; removing a top fraction from the third column; and returning the top fraction removed from the third column to the first column, wherein the second rectification column is operated at atmospheric pressure, and wherein the purified acetone has an acetaldehyde level of less than 5 ppm and a KT-Test time of greater than 11 hours, as measured by the SABIC KT-Test method. | 06-10-2010 |
| 20110112329 | ENERGY EFFICIENT ACETONE DRYING METHOD - The present invention provides energy and economically efficient and environmentally responsible processes for using acetone to dry, dehydrate and/or dewater various hydrated feedstocks. | 05-12-2011 |
| 20110306801 | EXTRACTION AND SEPARATION PROCESSES FOR RECOVERY OF ORGANIC SOLUTES FROM FEED SOURCES AND APPARATUSES FOR PERFORMING SAME - Methods for extracting an organic solute from a feed source using aromatic extraction solvents are described herein. Solvent modifiers such as, for example, cetyl alcohol may also be used to alter the properties of the solvent and improve the extraction. In some embodiments, the extraction solvent can be recycled after performing the extraction. In some embodiments, the organic solute may be separated from the extraction solvent after the extraction. For example, in some embodiments, the organic solute may be adsorbed on to 5 Å molecular sieve zeolites and then removed thereafter. Removal of the organic solute can take place by heating, applying a vacuum or a combination thereof. Apparatuses for extracting an organic solute from a feed source are also described herein. | 12-15-2011 |
| 20130190536 | METHOD FOR SALTING-OUT EXTRACTION OF ACETONE AND BUTANOL FROM A FERMENTATION BROTH - The present invention provided a method for salting-out extraction of acetone and butanol from a fermentation broth, characterized in that one type, or two or more types of salts and one type, or two or more types of extractants are added to an acetone-butanol-ethanol (ABE) fermentation broth, in which the salt saturation achieves 10%˜100%; and the volume ratio of the fermentation broth containing salts to the extractants is 1:0.1˜1:5. The mixture is allowed to stand until phase separation is formed. The top phase is a solvent phase or extraction phase enriched with acetone and butanol whereas the bottom phase is a salt-enriched phase or raffinate phase. This method involves many advantages, such as the simplified operation procedure, accelerated separation process and low separation cost, and therefore becomes a promising method of separating acetone and butanol in industrial application. | 07-25-2013 |
| 20130296612 | METHOD OF PURIFYING CRUDE ACETONE STREAM - The present invention relates to a method of treating a crude acetone stream. The method generally includes treating a crude acetone stream which has acetone and at least one low-boiling impurity with a catalyst to form a treated acetone stream that has acetone and at least one higher-boiling impurity and then distilling the treated acetone stream to remove at least a portion of the higher-boiling impurity to produce a purified acetone stream. This is particularly helpful in processes where a more pure acetone is desired, including a process for making purified isopropanol. | 11-07-2013 |
