摘要:
New phosphorous-containing macrocycles and process for their production, said process consisting in creating a bridge of imine linkages between at least two molecules of a dicarbonyl compound and at least two molecules of phosphohydrazide. Each macrocycle consists of at least one closed chain composed of an even number, equal to or more than four, of synthons, each synthon corresponding to a molecule which, in the chain, follows a synthon corresponding to the other molecule. Said process enables in particular the production of macrocycles having following the molecular structure (I).
摘要:
L'invention concerne de nouveaux macrocycles organiques phosphorés et leur procédé de fabrication. Ces macrocycles sont fabriqués en réalisant un pontage par des liaisons imine, entre au moins deux molécules de composé dicarbonylé et au moins deux molécules de phosphohydrazide. Chaque macrocycle comprend au moins une chaîne fermée composée d'un nombre pair supérieur ou égal à 4 de synthons, chaque synthon correspondant à une molécule succédant dans la chaîne à un synthon correspondant à l'autre molécule. Le procédé permet en particulier de fabriquer les macrocycles de structure moléculaire (I).
摘要:
The invention relates to a method for treating an asbestos solid (1), said method comprising at least one hot acid treatment step (4) for treating the asbestos (3) of the asbestos solid (1) at atmospheric pressure with an aqueous solution (5) of hydrochloric acid at a temperature close to the boiling temperature of the aqueous solution (5) of hydrochloric acid, in such a way as to obtain a so-called non-silicic solution (8) of at least one non-silicic constituent of the asbestos (3) in the aqueous solution (5) of hydrochloric acid and a so-called silicic solid (9). Said method is characterised in that the non-silicic solution (8) is subjected to a so-called precipitation treatment (13), wherein a selective precipitation (13) of the cationic species of iron present in said non-silicic solution (8) is carried out.
摘要:
The invention relates to a method for treating an asbestos solid (1), said method comprising at least one hot acid treatment step (4) for treating the asbestos (3) of the asbestos solid (1) at atmospheric pressure with an aqueous solution (5) of hydrochloric acid at a temperature close to the boiling temperature of the aqueous solution (5) of hydrochloric acid, in such a way as to obtain a so-called non-silicic solution (8) of at least one non-silicic constituent of the asbestos (3) in the aqueous solution (5) of hydrochloric acid and a so-called silicic solid (9). Said method is characterised in that the non-silicic solution (8) is subjected to a so-called precipitation treatment (13), wherein a selective precipitation (13) of the cationic species of iron present in said non-silicic solution (8) is carried out.
摘要:
Masking product for a chromium sulphate-based tanning agent ensuring the delayed association of chromium ions in solution to promote their absorption into the materials to be tanned. Said product comprises a mixture of alkaline formate and alkaline sulphite reacting synergically to ensure that the chromium sets almost completely and irreversibly on the skins. The invention is characterized by almost complete burnup of the tanning baths and a subsequent low salting out rate.