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    PROCESS FOR THE PRODUCTION OF POLYISOCYANATES
    7.
    发明专利
    PROCESS FOR THE PRODUCTION OF POLYISOCYANATES 未知

    公开(公告)号：CA1234826A

    公开(公告)日：1988-04-05

    申请号：CA476992

    申请日：1985-03-20

    Applicant: BAYER AG

    Inventor： KEGGENHOFF BERTHOLD ,  ELLENDT GUENTHER ,  PETINAUX MARCEL ,  MITSCHKER ALFRED ,  LANGE PETER M

    IPC: C07C265/00 ,  C07C67/00 ,  C07C71/00 ,  C07C241/00 ,  C07C263/10 ,  C07C265/14 ,  C07C119/042

    Abstract: Mo-2653 LeA 22,994 PROCESS FOR THE PRODUCTION OF POLYISOCYANATES Polyisocyanates are produced by reacting a polyamine solution with a phosgene solution. After the product polyisocyanate has been recovered, the solvent or a portion of the solvent employed is treated with crosslinked polymers insoluble in the solvent which polymers contain primary and/or secondary alcoholic hydroxyl groups and/or primary and/or secondary amino groups. After treatment, the polymer and any reaction products are removed. The solvent may then be reused. Preferred solvents are chlorobenzene and o-dichloro-benzene. The preferred polymers are bead polymers or bead copolmers of (meth)acrylic acid or styrene/divinyl benzene copolymer. Mo-2653

    9.
    发明专利
    未知

    公开(公告)号：DD202524A5

    公开(公告)日：1983-09-21

    申请号：DD24088882

    申请日：1982-06-18

    Applicant: ERDOELCHEMIE GMBH ,  BAYER AG

    Inventor： HERWIG JENS ,  SCHULWITZ BRUNO ,  SCHLEPPINGHOFF BERNHARD ,  SCHEEF HANS-VOLKER ,  LANGE PETER M

    IPC: C07C1/20 ,  B01J20/26 ,  C07C1/00 ,  C07C7/12 ,  C07C7/148 ,  C07C11/02 ,  C07C11/09 ,  C07C41/06 ,  C07C67/00

    Abstract: Pure tert.-olefins are prepared from mixtures of hydrocarbons, which contain at least one such tert.-olefin, by reaction with an alkanol to give the corresponding alkyl tert.-alkyl ethers, and subsequent cleavage of these ethers back to the corresponding pure tert.-olefins and the alkanol, and the separation of the pure tert.-olefin from the alkanol. For this, the alkanol present after the cleavage of the ether is separated from the tert.-olefin to the extent of 60 to 99% by weight by distillation, and the residual amount of alcohol in the olefin fraction is removed by adsorption from this fraction onto a synthetic ion exchanger as an absorber resin. The admixture of the alkanol to the mixture of hydrocarbons with at least one tert.-olefin is carried out partly by using the alkanol fraction arising from the separating off of the pure tert.-olefin, and partly by desorption of the alkanol from the absorber resin with the aid of the mixture of hydrocarbons containing at least 1 tert.-olefin.

    PROCESS FOR THE PREPARATION OF PURE ALKYL TERT.-ALKYL ETHERS AND HYDROCARBON RAFFINATES WHICH ARE LARGELY FREE FROM ISOOLEFINS AND FROM ALKANOLS
    10.
    发明专利
    PROCESS FOR THE PREPARATION OF PURE ALKYL TERT.-ALKYL ETHERS AND HYDROCARBON RAFFINATES WHICH ARE LARGELY FREE FROM ISOOLEFINS AND FROM ALKANOLS 未知

    公开(公告)号：CA1248974A

    公开(公告)日：1989-01-17

    申请号：CA405356

    申请日：1982-06-17

    Applicant: ERDOELCHEMIE GMBH ,  BAYER AG

    Inventor： HERWIG JENS ,  SCHEEF HANS-VOLKER ,  SCHLEPPINGHOFF BERNHARD ,  LANGE PETER M

    IPC: C07C43/04 ,  B01J31/00 ,  C07B61/00 ,  C07C1/00 ,  C07C1/20 ,  C07C7/12 ,  C07C7/148 ,  C07C11/02 ,  C07C11/08 ,  C07C29/76 ,  C07C41/00 ,  C07C41/06 ,  C07C41/36 ,  C07C67/00 ,  C07C9/10

    Abstract: Hydrocarbon mixtures which contain at least one tertiary olefin are reacted with an alkanol on an acid cation exchanger, a product mixture being formed which contains the resulting alkyl tertiary-alkyl ether,excess unreacted alkanol,and the residual hydrocarbons which were contained in the original hydrocarbon mixture. Furthermore, this product mixture contains minor amounts of unreacted tertiary-olefin, it being possible for the contents to be reduced to 0 at complete conversion. The excess, unreacted alkanol is removed from the resulting product mixture, or from its part streams produced in the working-up, by absorption on a synthetic ion exchanger containing groups which exchange cations or anions, or mixtures of such ion exchangers in the form of an absorber resin. The alkanol to be fed into the reaction zone is at least partially taken by desorption from an absorber resin charged with alkanol, the process being carried out with the aid of the hydrocarbon mixture containing at least one tertiary olefin. For alkanol absorption and alkanol desorption, at least two absorber resin layers are employed and are switched from absorption to desorption and vice versa, in cyclic operation. The product mixture leaving the etherification reactor can firstly be freed on an absorber resin from excess alkanol, and can thereafter be separated into the alkyl tertiary alkyl ether and the residual gas by distillation. However, the product mixture leaving the etherification reactor can also firstly be separated into the alkyl tertiary-alkyl ether and the residual gas by means of distillation, at least one of the part streams obtained containing alkanol, and thereafter the alkanol-containing part stream or streams can be separated from the alkanol, on an absorber resin.

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