专利名称：METHOD FOR SEPARATING TRIOXANE
FROM A MIXTURE CONTAINING TRIOXANE,FORMALDEHYDE AND WATER
发明人：LANG, NEVEN,STROEFER,
ECKHARD,STAMMER, ACHIM,FRIESE,THORSTEN,SIEGERT, MARKUS,OTT,MICHAEL,HASSE, HANS,GRUETZNER,THOMAS,BLAGOV, SERGEJ
申请号：EP04804129.7申请日：20041221公开号：EP1699537A1公开日：20060913
摘要：The invention relates to a method for separating trioxane from a mixturecontaining formaldehyde, trioxane and water. According to said method: the mixture (1) isdistilled in a first distillation stage (7) at a pressure of between 0.1 and 2 bar to obtain astream (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 astream (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 ofbetween 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 distillationstage (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) containingpredominantly trioxane, in addition to water and formaldehyde. The stream (16) is thendistilled in a third distillation stage (17) at a pressure of between 0.1 and 4 bar, to obtaina stream (18) containing predominantly water, in addition to formaldehyde and therecycling stream (19) containing predominantly trioxane, in addition to water andformaldehyde. The resultant stream (18) is optionally distilled in a fourth distillationstage (20), to obtain a stream (21) containing predominantly water and a stream (22)containing predominantly formaldehyde.
申请人：BASF AKTIENGESELLSCHAFT
地址：67056 Ludwigshafen DE
国籍：DE
代理机构：Isenbruck, Günter
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