公开(公告)号：DE19748380A1

公开(公告)日：1999-05-06

申请号：DE19748380

申请日：1997-10-31

Applicant: HOECHST AG

Inventor： SIEVERS WERNER DR ,  SCHWEERS ELKE DR ,  MEISTER CHRISTINE

IPC: C07C45/51 ,  C07C45/78 ,  C07C45/85 ,  C07C47/04 ,  C07C47/052 ,  C07C47/058 ,  C07D323/06 ,  C08G2/00 ,  C08G2/08 ,  C08G65/00 ,  A01C1/00 ,  C09B69/00

Abstract: The invention relates to a method for purifying formaldehyde, whereby the formaldehyde is rinsed with alcohol in an absorption unit and almost entirely converted to hemiformal while gaseous impurities are separated in a first purification step. The remaining impurities are transformed into a gaseous state in a desorption unit and are separated from the liquid hemiformal, whereupon the purified hemiformal is thermally cleaved into alcohol and formaldehyde in a pyrolysis unit. The formaldehyde thus produced is suitable, for instance, for use in the production of oligomers, polymers, dyes and fertilisers, in addition to seed treatment.

公开(公告)号：DE19604986A1

公开(公告)日：1997-08-14

申请号：DE19604986

申请日：1996-02-12

Applicant: HOECHST AG

Inventor： SIEVERS WERNER DR ,  MUELLER GUENTER DR

IPC: B01D53/44 ,  B01D47/14 ,  B01D53/14 ,  B01D53/18 ,  B01D47/00 ,  B01D3/00

公开(公告)号：DE19719395A1

公开(公告)日：1998-11-12

申请号：DE19719395

申请日：1997-05-07

Applicant: HOECHST AG

Inventor： SIEVERS WERNER DR ,  ZIMMERMANN ANDREAS DR

IPC: B01D53/04 ,  C02F1/28 ,  C12P35/06 ,  B01J20/00 ,  A61K31/545 ,  B01D15/08 ,  B01D53/02 ,  C12P1/00

Abstract: The uses is claimed of: (i) aerogels (AG) for adsorption from a liquid phase; (ii) hydrophilic or hydrophobic AG as adsorbents; and (iii) adsorbents containing AG (not as a mixture with activated carbon or active alumina) for adsorption from a gas phase. Also claimed are: (a) corresponding purification methods, involving contacting (i') liquids, (ii') gases or liquids or (iii') gases to be purified with adsorbents as in (i), (ii) or (iii) respectively, for adsorption of impurities; and (b) a method for isolating organic compounds (I) from (preferably aqueous) liquids, by contacting the liquids with AG as adsorbent for sufficient time to adsorb (I), separating AG from the liquid and separating (I) from AG.

公开(公告)号：DE19716372A1

公开(公告)日：1998-10-22

申请号：DE19716372

申请日：1997-04-18

Applicant: HOECHST AG

Inventor： SIEVERS WERNER DR ,  ZIMMERMANN ANDREAS DR

IPC: B01D15/00 ,  B01D53/02 ,  C02F1/28 ,  B01J20/00 ,  C07B63/04

Abstract: Use of aerogels as adsorption material for adsorption in liquid phase is new. Also claimed are: (1) the use of hydrophobic and hydrophilic aerogels as adsorption material, and (2) the use of adsorption materials containing aerogels which are not mixed with active carbon or active aluminium oxide, for adsorption in a gas phase.

公开(公告)号：DE19747647A1

公开(公告)日：1999-05-06

申请号：DE19747647

申请日：1997-10-29

Applicant: HOECHST AG

Inventor： SIEVERS WERNER DR ,  SCHWEERS ELKE DR ,  ROSENBERG MICHAEL

IPC: B01D1/22 ,  B01D1/30 ,  C07C45/51 ,  C07C45/78 ,  C07C45/82 ,  C07C47/04 ,  C07C47/045 ,  C07C47/058

Abstract: A process and device are disclosed for subsequently purifying gases, in particular pyrolysis gases, and for preparing pure formaldehyde. Hemiformal is pyrolysed in an evaporator, the resulting formaldehyde vapour is led through a liquid component condensed in the bottom region of the evaporator, the liquid component condensed as a falling film on the inner wall of the evaporator is discharged through a cooled outlet pipe arranged in the bottom region of the evaporator and the formaldehyde vapour is discharged in the same direction through the cooled outlet pipe. The liquid component and the formaldehyde are separately recovered at the end of the outlet pipe away from the evaporator.

公开(公告)号：DE19732578A1

公开(公告)日：1999-03-04

申请号：DE19732578

申请日：1997-07-29

Applicant: HOECHST AG

Inventor： SIEVERS WERNER DR ,  DAIMINGER ULRICH DR ,  BOENSEL HARALD DR ,  BAUER WOLFGANG ,  SEMEL JOACHIM DR

IPC: B01J31/10 ,  C07B61/00 ,  B01J31/06 ,  C07C67/08 ,  C07C69/24 ,  B01J31/08

Abstract: Sulphonated aromatic polyetherketone-cation exchangers (I) and sulphonated polyphenylene sulphide cation exchangers (II) are used as catalysts.