| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 568853000 | Polyalkylol substituted alkane (e.g., pentaerythritol, trimethylolethane, ect.) | 17 |
| 20100137656 | METHOD FOR IMPROVING THE COLOR NUMBER OF TRIMETHYLOLPROPANE - The present invention relates to a method for the production of trimethylolpropane with a low color number by treatment with activated carbon. | 06-03-2010 |
| 20100152500 | METHOD OF PREPARING PENTAERYTHRITOL - A method of preparing monopentaerythritol, dipentaerthritol, and sodium formate through high temperature condensation and cascade recrystallization is disclosed. The method lowers the energy consumption dramatically and improves the cost-effectiveness by carrying out the reaction in a non-low-temperature zone, and thereby avoiding the requirement for refrigeration. The method alleviates the difficulty of separation and improves the product quality by means of cascade separation process, and thereby avoiding the low purity from a single separation. In addition, the mother liquor obtained after each separation step is recycled to the previous step as the recycling liquor, which avoids discharging waste, increases the product yield and lowers raw materials consumption. | 06-17-2010 |
| 20110098515 | METHOD OF PRODUCING NEOPENTYL GLYCOL - The present invention relates to a method of producing neopentyl glycol by addition of isobutyraldehyde and formaldehyde in the presence of a tertiary alkylamine as catalyst to give the hydroxypivalinaldehyde with subsequent liquid phase hydrogenation in the presence of a nickel catalyst at a temperature of 80 to 180° C. and at a pressure of 6 to 18 MPa in the presence of an aliphatic alcohol and in the presence of water. | 04-28-2011 |
| 20120004472 | METHOD FOR PREPARING POLYMETHYLOLS - The present invention relates to a process for distilling an aqueous polymethylol mixture which comprises a polymethylol of the formula (I) | 01-05-2012 |
| 20120165576 | USE OF ERYTHRITOL FOR THE PREVENTION OR TREATMENT OF HYPERTENSION - The present invention relates to the use of erythritol for the up regulation of the SOD2 enzyme in mammals and prevention or treatment of hypertension. More specifically, erythritol protects against the development of endothelial dysfunction and related reduction of vasodilatation and erythritol protects against hemolysis-induced vasoconstriction. | 06-28-2012 |
| 20120178973 | Method for improving the color number of trimethylolpropane - The present invention relates to a method for producing trimethylolpropane having a low color number by processing a raw reaction solution obtained according to the inorganic Cannizarro process while adhering to precisely defined pH values. | 07-12-2012 |
| 20120245394 | METHOD FOR PRODUCING A SUPPORTED HYDROGENATION CATALYST HAVING INCREASED HYDROGENATION ACTIVITY - In a process for preparing a supported hydrogenation catalyst with increased hydrogenation activity, which comprises a hydrogenating metal and/or an oxide of a hydrogenating metal on an Al | 09-27-2012 |
| 20160031775 | System And Method For Producing Neopentyl Glycol - The present invention describes a process for production of neopentyl glycol (NPG) from formaldehyde (FD) and isobutyraldehyde (IBD). FD and IBD first react to form hydroxypivaldehyde (HPD) in an aldol condensation step, then HPD is hydrogenated to form NPG in a hydrogenation step. The aldol condensation step is performed using a solid catalyst such as an ion exchange resin catalyst, which can be easily separated from the reaction product. The feed to the aldol condensation step is made homogeneous by adjusting the ratio of IBD, FD, and water in the feed or by adding a solvent that is miscible with both IBD and water. High purity NPG is recovered from the product of the hydrogenation step by a suitable method such as crystallization. | 02-04-2016 |
| 20160145179 | Manufacture of Methylolalkanes - A multistage tubular reaction system and method for preparing methylol derivatives of an aldehyde includes a tubular reaction system with a plurality of successive reactor stages provided with a formaldehyde containing feed stream. The system includes multiple feed ports for the staged addition of C | 05-26-2016 |
| 568854000 | Purification or recovery | 8 |
| 20080275277 | PROCESSES FOR ISOLATING OR PURIFYING PROPYLENE GLYCOL, ETHYLENE GLYCOL AND PRODUCTS PRODUCED THEREFROM - Processes for separating butanediols from glycols are disclosed, as well as products and compositions resulting therefrom. | 11-06-2008 |
| 20090062575 | PROCESS FOR PRODUCING MONOPENTAERYTHRITOL OF HIGH PURITY AND MONOPENTAERYTHRITOL PRODUCED BY THE PROCESS - The invention relates to a process for producing monopentaerythritol of high purity and monopentaerythritol produced by the process. Formaldehyde is reacted with acetaldehyde in an aqueous solution in the presence of a strongly basic hydroxide in a conventional way. The obtained reaction mixture is evaporated to a dryness of 50-70% by weight and is thereafter cooled. Crystals of pentaerythritol thereby formed are separated off. The crystals are dissolved in water or in a water-containing mother liquor containing pentaerythritol to a dryness of 35-55% by weight. The solution is treated in a purification step whereupon monopentaerythritol of high purity is crystallized at a temperature of 40-90° C. and separated from the remaining mother liquor which is recirculated to the above mentioned step. | 03-05-2009 |
| 20110118511 | METHODS OF PURIFYING 1,2,4-BUTANETRIOL AND COMPOSITIONS INCLUDING 1,2,4-BUTANETRIOL - Methods of purifying BT are disclosed. The method comprises adding at least one polyhydroxyl compound to a crude BT mixture comprising BT and at least one boron-containing compound to form a polyhydroxyl compound/BT mixture. In one embodiment, the polyhydroxyl compound/BT mixture is then heated to a temperature greater than the boiling point of BT but less than the boiling point of the at least one polyhydroxyl compound. In another embodiment, the polyhydroxyl compound/BT mixture is heated to a temperature greater than the melting point of the polyhydroxyl compound, and then to a temperature greater than the boiling point of BT but less than the boiling point of the at least one polyhydroxyl compound. A composition comprising BT is also disclosed. | 05-19-2011 |
| 20110160494 | Trimethylolpropane color improvement - The present invention provides a process for improving the color of trimethylolpropane which comprises the steps of a) supplying a crude, aqueous base solution of trimethylolpropane, containing color causing impurities, and having a pH of less than about 9; b) contacting said base solution with an alkaline material for a period of time sufficient to increase the pH of said base solution to greater than 11 and at a sufficient temperature to allow the color causing impurities to react with said alkaline material; c) cooling the resulting solution from step (b) for a sufficient period of time; d) contacting said base solution of step (c) with an organic acid for a sufficient period of time to lower the pH thereof to less than about 9.5; e) extracting the trimethylolpropane from said base solution of step (d) with an organic solvent; f) separating the trimethylolpropane from said organic solvent; and g) purifying said trimethylolpropane from step f) to form a trimethylolpropane having a phthalic color of less than 0.20 and an acid wash color of less than 8. | 06-30-2011 |
| 20120010435 | METHOD FOR ISOLATING DI-TRIMETHYLOL PROPANE - The present invention relates to a method for isolating ditrimethylol propane from secondary trimethylol propane production streams. | 01-12-2012 |
| 20140081052 | RECOVERY OF TRIMETHYLOLPROPANE FROM PURIFICATION RESIDUE - A method of reclaiming trimethylolpropane from purification residue includes hydrolyzing a purification residue with an aqueous medium in the presence of (i) an acid and (ii) an oxidizing agent. The method is particularly effective to reclaim trimethylolpropane from monolinear-bis-TMP-formal:
| 03-20-2014 |
| 20140081053 | RECOVERY OF ALCOHOLS FROM PURIFICATION RESIDUE - A method of reclaiming alcohols from purification residue includes hydrolyzing a purification residue with an aqueous medium in the presence of (i) an acid and (ii) an oxidizing agent. | 03-20-2014 |
| 20140296583 | Process for Obtaining Trimethylolpropane-Enriched Product Streams From the Secondary Streams of Trimethylolpropane Preparation - A process for obtaining trimethylolpropane-enriched product streams from the forerun fractions obtained in the distillative purification of trimethylolpropane is characterized in that: (a) the forerun fractions are treated separately or in combination at a temperature of 160 to 280° C. and at a pressure of 1 to 30 MPa with hydrogen in the presence of a hydrogenation catalyst and an acidic compound; and (b) the reaction mixture obtained after step a) is separated by distillation into a trimethylolpropane-enriched, catalyst-free product stream and a catalyst-containing product stream. The trimethylolpropane is prepared by the Cannizzaro process using alkali metal or alkaline earth metal compounds or stoichiometric amounts of trialkylamines, or is produced by the hydrogenation process in the presence of catalytic amounts of trialkylamines or alkali metal or alkaline earth metal compounds. | 10-02-2014 |
