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    METHOD OF REPROCESSING RESIDUES CONTAINING DIHYDROXY COMPOUNDS
    2.
    发明申请
    METHOD OF REPROCESSING RESIDUES CONTAINING DIHYDROXY COMPOUNDS 审中-公开
    代替含有二羟基化合物的残留物的方法

    公开(公告)号：WO9732915A3

    公开(公告)日：1997-10-30

    申请号：PCT/EP9701081

    申请日：1997-03-04

    Applicant: BASF AG ,  BRAUNE PETER

    Inventor： BRAUNE PETER

    IPC: C07C29/80 ,  C07C29/88 ,  C07C31/20 ,  C08F2/00 ,  C08G63/88 ,  C08G63/78

    CPC classification number: C07C29/80 ,  C07C29/88 ,  C07C31/207

    Abstract: The invention concerns a method of reprocessing residues which contain dihydroxy compounds and are obtained during the production of polyesters. According to this method: (1) in a first step, a dicarboxylic acid or its esters or ester-forming derivatives with a molar excess of dihydroxy compound are esterified or transesterified; (2) in at least one second step, the esterification product obtained according to (1) is polycondensed; and (3) the vapours (a) and (b) produced according to (1) and (2) are subjected to a treatment for recovering the starting substances. This method is characterized in that the treatment for recovering the starting substances is carried out in the presence of an alkali or alkaline earth compound in an amount of between 0.5 and 10 wt.% calculated as alkali metal or alkaline earth metal relative to the solids content of the vapours.

    3.
    发明专利
    未知

    公开(公告)号：ES2171656T3

    公开(公告)日：2002-09-16

    申请号：ES96907365

    申请日：1996-03-06

    Applicant: BASF AG

    Inventor： BRAUNE PETER

    IPC: C08G63/78

    Abstract: PCT No. PCT/EP96/00941 Sec. 371 Date Aug. 26, 1997 Sec. 102(e) Date Aug. 26, 1997 PCT Filed Mar. 6, 1996 PCT Pub. No. WO96/28492 PCT Pub. Date Sep. 19, 1996A process for the continuous preparation of thermoplastic polyesters by a) a first step of (trans)esterifying a dicarboxylic acid or its esters or ester-forming derivatives with a molar excess of a dihydroxy compound, b) a second step of precondensing the (trans)esterification product of a), and c) a third step of polycondensing the product of b) comprises carrying out step a) and/or step b) of the process in two or more temperature zones.

    4.
    发明专利
    未知

    公开(公告)号：AT182601T

    公开(公告)日：1999-08-15

    申请号：AT96907364

    申请日：1996-03-06

    Applicant: BASF AG

    Inventor： BRAUNE PETER

    IPC: C07C29/80 ,  C07C29/88 ,  C07C31/20 ,  C08G63/78

    Abstract: PCT No. PCT/EP96/00940 Sec. 371 Date Sep. 4, 1997 Sec. 102(e) Date Sep. 4, 1997 PCT Filed Mar. 6, 1997 PCT Pub. No. WO96/29358 PCT Pub. Date Sep. 26, 1996A process for working up dihydroxy compound residues from the preparation of polyesters by a) a first step of (trans)esterifying a dicarboxylic acid or its esters or ester-forming derivatives with a molar excess of a dihydroxy compound, b) at least one second step of polycondensing the esterification product of a), and c) subjecting the vapors from the reaction of a) and b) to a treatment for recovering the starting materials, comprises 1) combining the vapors of step a) and some of the vapors of step b) of the process in at least one column A) and removing the low boiling constituents of the vapors overhead and recycling the bottom product, which predominantly contains the excess dihydroxy compounds and also oligomeric and polymeric reaction products, into step a), and 2) transferring the other part of the vapors of step b) of the process into at least one column B) and removing the low boiling constituents of the vapors overhead and discharging the bottom product from the column and subsequently subjecting it to a further treatment for recovering the dihydroxy compound.

    5.
    发明专利
    未知

    公开(公告)号：DE59608647D1

    公开(公告)日：2002-03-14

    申请号：DE59608647

    申请日：1996-03-06

    Applicant: BASF AG

    Inventor： BRAUNE PETER

    IPC: C08G63/78

    Abstract: PCT No. PCT/EP96/00941 Sec. 371 Date Aug. 26, 1997 Sec. 102(e) Date Aug. 26, 1997 PCT Filed Mar. 6, 1996 PCT Pub. No. WO96/28492 PCT Pub. Date Sep. 19, 1996A process for the continuous preparation of thermoplastic polyesters by a) a first step of (trans)esterifying a dicarboxylic acid or its esters or ester-forming derivatives with a molar excess of a dihydroxy compound, b) a second step of precondensing the (trans)esterification product of a), and c) a third step of polycondensing the product of b) comprises carrying out step a) and/or step b) of the process in two or more temperature zones.

    6.
    发明专利
    未知

    公开(公告)号：DE19509957A1

    公开(公告)日：1996-09-19

    申请号：DE19509957

    申请日：1995-03-18

    Applicant: BASF AG

    Inventor： BRAUNE PETER

    IPC: C07C29/80 ,  C07C29/88 ,  C07C31/20 ,  C08G63/78 ,  C07C31/22

    Abstract: The invention concerns a process for preparing residues which contain dihydroxy compounds and occur during the production of polyesters, in that: a) in a first step, a dicarboxylic acid or its ester or esterifying derivatives are esterified or transesterified with a molar excess of a dihydroxy compound; b) in at least a second step, the esterification product obtained in a) is polycondensed; and c) the vapours occurring during the reactions according to a) and b) are subjected to a treatment for recovering the starter substances. The invention is characterized in that: 1) the vapour occurring in step a) and some of the vapour of step b) of the process are combined in at least one column (A), the low-boiling components of the vapours are separated at the top and the base product, which predominantly contains the excess dihydroxy compounds and oligomer and polymer reaction products, is returned to step a); and 2) the other vapour portion of step b) of the process is transferred to at least one column (B), the low-boiling components of the vapours are separated at the top and the base product is discharged from the column and subsequently subjected to a further treatment for recovering the dihydroxy compound.

    7.
    发明专利
    未知

    公开(公告)号：DE59602549D1

    公开(公告)日：1999-09-02

    申请号：DE59602549

    申请日：1996-03-06

    Applicant: BASF AG

    Inventor： BRAUNE PETER

    IPC: C07C29/80 ,  C07C29/88 ,  C07C31/20 ,  C08G63/78

    Abstract: PCT No. PCT/EP96/00940 Sec. 371 Date Sep. 4, 1997 Sec. 102(e) Date Sep. 4, 1997 PCT Filed Mar. 6, 1997 PCT Pub. No. WO96/29358 PCT Pub. Date Sep. 26, 1996A process for working up dihydroxy compound residues from the preparation of polyesters by a) a first step of (trans)esterifying a dicarboxylic acid or its esters or ester-forming derivatives with a molar excess of a dihydroxy compound, b) at least one second step of polycondensing the esterification product of a), and c) subjecting the vapors from the reaction of a) and b) to a treatment for recovering the starting materials, comprises 1) combining the vapors of step a) and some of the vapors of step b) of the process in at least one column A) and removing the low boiling constituents of the vapors overhead and recycling the bottom product, which predominantly contains the excess dihydroxy compounds and also oligomeric and polymeric reaction products, into step a), and 2) transferring the other part of the vapors of step b) of the process into at least one column B) and removing the low boiling constituents of the vapors overhead and discharging the bottom product from the column and subsequently subjecting it to a further treatment for recovering the dihydroxy compound.

    Method of reprocessing residues containing dihydroxy compounds
    9.
    发明专利
    Method of reprocessing residues containing dihydroxy compounds 未知

    公开(公告)号：AU2095197A

    公开(公告)日：1997-09-22

    申请号：AU2095197

    申请日：1997-03-04

    Applicant: BASF AG

    Inventor： BRAUNE PETER

    IPC: C07C29/80 ,  C07C29/88 ,  C07C31/20 ,  C08F2/00 ,  C08G63/88 ,  C08G63/78

    Abstract: A process for working up residues containing dihydroxy compounds resulting from the preparation of polyesters, where(1) in a first stage there is esterification or transesterification of a dicarboxylic acid or esters thereof or ester-forming derivatives with a molar excess of a dihydroxy compound,(2) in at least one second stage there is polycondensation of the esterification product obtained in (1),(3) the vapors (a) and (b) resulting from the reactions in (1) and (2) respectively are subjected to a treatment to recover the starting materials,wherein the treatment to recover the starting materials is carried out in the presence of an alkali metal or alkaline earth metal compound in an amount of from 0.5 to 10% by weight, calculated as alkali metal or alkaline earth metal, based on the solids content of the vapors.

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