公开(公告)号：DE2449162A1

公开(公告)日：1976-04-22

申请号：DE2449162

申请日：1974-10-16

Applicant: BASF AG

Inventor： REBHAN JOERG DIPL ING ,  MATTHIES HANS GEORG DR DIPL CH

IPC: C08G63/00 ,  C07C69/82 ,  C08G63/78 ,  C08G63/22

Abstract: An improved process for the continuous manufacture of linear high molecular weight polyesters by direct esterification of terephthalic acid with excess glycols in a medium comprising terephthalic acid glycol esters or their oligomers, under superatmospheric pressure at temperatures above 200 DEG C, followed by polycondensation in the presence of catalysts at from 260 DEG to 290 DEG C. The improvement is that the mixture fed to the esterification contains terephthalic acid and glycols in the molar ratio of 1:1.15 to 1:1.5 and that during the esterification from 20 to 30% by weight of the excess of glycols over the molar ratio terephthalic acid: glycols = 1:1 are continuously distilled from the reaction mixture.

公开(公告)号：DE2315114A1

公开(公告)日：1974-10-10

申请号：DE2315114

申请日：1973-03-27

Applicant: BASF AG

Inventor： THOMA RICHARD DIPL ING DR ,  REBHAN JOERG DIPL ING ,  BOLTE HERBERT DIPL CHEM DR ,  HEIL EDUARD DIPL ING ,  FISCHER HERMANN DIPL CHEM DR ,  MATTHIAS KLAUS DIPL ING DR

IPC: B01F23/47 ,  C08J3/22 ,  B01F3/10

Abstract: 1455663 Mixing liquids BASF AG 26 March 1974 [27 March 1973] 13255/74 Heading B1C In a process for mixing two liquids having a viscosity difference of at least two powers of 10 in terms of poise, a portion of the high viscosity liquid is. mixed with low-viscosity liquid in a dynamic mixer to form a premix having a viscosity less than two powers of 10 bellow that of the higher viscosity liquid, and the premix mixed with the remainder of the high viscosity material in a static mixer. Preferably the mixing of the premix in the dynamic mixer is carried out at a sheer rate of at least 0.1 sec -1 to form a premix containing not more than 60% by weight of the low viscosity material, and the mixing in the static mixer is carried out at a sheer rate of not more than 10 4 sec -1 . In an apparatus the high viscosity liquid 1 is branched off through a line 4 and metering pump 5 to a junction 6 where it is joined by low viscosity liquid metered by a pump 8. The premix so formed is mixed in a toothed disc mixer 12 and fed to the main high viscosity stream at 17, the total stream being subdivided into partial streams which are displaced and recombined in a static homogenizer 20. In modifications a second high viscosity material 3 .may be added to the branch line 4 of the first, and a third high viscosity liquid material 14 with or without solids content to the junction 6 or to the premix at 18; further low viscosity material may be added to the main stream of the mixture at 19 or through a line 10 to the static homogenizer 20. The invention may be used for mixing lubricants, expanding agents, stabilizers and plasticizers with molten polymers; examples relate to nylon 6 and the mixing of a paraffin oil with polystyrene.