B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 3/36 (2006.01) B01D 3/14 (2006.01) C07D 323/06 (2006.01)
Patent
CA 2548640
The invention relates to a method for separating trioxane from a mixture containing formaldehyde, trioxane and water. According to said method: the mixture (1) is distilled in a first distillation stage (7) at a pressure of between 0.1 and 2 bar to obtain a stream (8) containing formaldehyde and a stream (9) containing predominantly trioxane, in addition to water and formaldehyde; the stream (9) is mixed with a recycling stream (19) containing predominantly trioxane, in addition to water and formaldehyde to form a stream (10) containing predominantly trioxane, in addition to water and formaldehyde; the stream (10) is then distilled in a second distillation stage (14) at a pressure of between 0.2 and 10 bar, optionally after the separation of low- boilers from the stream (9) or (10) in an additional distillation stage (11). The pressure in the second distillation stage (14) is at least 0.1 bar higher than the pressure in the first distillation stage (7). Said distillation produces a stream (15) consisting of trioxane and a stream (16) containing predominantly trioxane, in addition to water and formaldehyde. The stream (16) is then distilled in a third distillation stage (17) at a pressure of between 0.1 and 4 bar, to obtain a stream (18) containing predominantly water, in addition to formaldehyde and the recycling stream (19) containing predominantly trioxane, in addition to water and formaldehyde. The resultant stream (18) is optionally distilled in a fourth distillation stage (20), to obtain a stream (21) containing predominantly water and a stream (22) containing predominantly formaldehyde.
L'invention concerne un procédé pour séparer le trioxane d'un mélange (1) de formaldéhyde, de trioxane et d'eau, selon lequel le mélange (1) est distillé à une pression de 0,1 à 2 bars dans un premier niveau de distillation (7) pour former un flux (8) contenant du formaldéhyde et un flux (9) contenant principalement du trioxane, mais aussi de l'eau et du formaldéhyde, puis le flux (9) est mélangé à un flux de retour (19) contenant principalement du trioxane, mais aussi de l'eau et du formaldéhyde, formant ainsi un flux (10) contenant principalement du trioxane, mais aussi de l'eau et du formaldéhyde. Ensuite, éventuellement après séparation des éléments à bas point d'ébullition du flux (9) ou (10) dans un autre niveau de distillation (11), le flux (10) est distillé à une pression de 0,2 à 10 bars dans un deuxième niveau de distillation (14), la pression de ce deuxième niveau de distillation (14) dépassant d'au moins 0,1 bar celle du premier niveau de distillation (7), d'où l'obtention d'un flux (15) de trioxane et d'un flux (16) contenant principalement du trioxane, mais aussi de l'eau et du formaldéhyde. Le flux (16) est distillé à une pression de 0,1 à 4 bars dans un troisième niveau de distillation (17) pour former un flux (18) contenant principalement de l'eau mais aussi du formaldéhyde, ainsi qu'un flux de retour (19) contenant principalement du trioxane, mais aussi de l'eau et du formaldéhyde. Le flux (18) est éventuellement distillé dans un quatrième niveau de distillation (20) pour former un flux (21) contenant principalement de l'eau et un flux (22) contenant principalement du formaldéhyde.
Blagov Sergej
Friese Thorsten
Gruetzner Thomas
Hasse Hans
Lang Neven
Basf Aktiengesellschaft
Robic
LandOfFree
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