Gayet
Arnaud Jean Albert Gayet, Monthey CH
Patent application number | Description | Published |
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20140323302 | PROCESS FOR THE PREPARATION OF A QUINOLINE CARBOXYLIC ACID - The invention provides a process for the preparation of a carboxylic acid of formula (IV) (which is useful as a safener for herbicides): wherein R | 10-30-2014 |
Hubert Gayet, Villeurbanne FR
Patent application number | Description | Published |
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20090306436 | PREPARATION OF PURIFIED HYDROQUINONE AND FORMING OF SAME - Purified hydroquinone is prepared and formed from raw compounds essentially containing hydroquinone associated with very small quantities of impurities including resorcinol and pyrogallol, and includes a distillation purification step in which the resorcinol and pyrogallol are eliminated, directly followed by a step in which the purified hydroquinone is formed. | 12-10-2009 |
20100059359 | SEPARATION AND PURIFICATION OF HYDROQUINONE FROM CRUDE MIXTURES THEREOF - Separation and purification of hydroquinone from crude mixtures thereof essentially containing hydroquinone in combination with very small amounts of impurities including resorcinol and pyrogallol, include a topping distillation allowing the resorcinol to be removed as the distillation top product, and allowing a crude mixture essentially containing hydroquinone and the heavy impurities to be recovered at the column bottom, such mixture then being subjected to a bottoming distillation which allows the pyrogallol to be removed at the column bottom and allows hydroquinone in a purified form to be recovered at the column top. | 03-11-2010 |
20120103786 | SEPARATION OF AROMATIC ALDEHYDES - A method for separating and recovering an aromatic aldehyde from a mixture thereof that also contains tar and light and heavy impurities, includes feeding the liquid flow containing this mixture into an evaporator, vaporizing the mixture in order to separate, on the one hand, a gaseous flow containing the aromatic aldehyde, the light impurities, the heavy impurities that can be vaporized at the selected evaporation temperature and pressure and, on the other hand, a liquid flow essentially containing the tar, and recovering the aromatic aldehyde from the separated gaseous flow. | 05-03-2012 |
Hubert Gayet, Saint Priest FR
Patent application number | Description | Published |
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20150203428 | Method for producing alkoxy-hydroxybenzaldehyde that is substantially free of alkyl-alkoxy-hydroxybenzaldehyde - The invention relates to a method for producing at least one alkoxy-hydroxybenzaldehyde (AHBA) from at least one hydroxyphenol (HP), said method being characterised in that it comprises the formation of at least one alkoxyphenol (AP) and alkyl-alkoxyphenol (AAP) and the separation (S) of AP from AAP, said separation (S) being carried out prior to obtaining AHBA. | 07-23-2015 |