Distillation: processes – separatory – With chemical reaction – Including step of adding catalyst or reacting material
Reexamination Certificate
2006-02-14
2006-02-14
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
With chemical reaction
Including step of adding catalyst or reacting material
C203S072000, C203S075000, C203S078000, C203S087000, C203SDIG016, C159S013100, C159S027100, C159S028300, C159S043100, C159S048100, C159S049000, C202S154000, C202S155000, C202S173000, C202S186000, C202S236000, C202S259000, C560S218000, C560S233000, C560S247000
Reexamination Certificate
active
06998026
ABSTRACT:
A tert-C4–C8-alkyl (meth)acrylate is prepared by reacting (meth)acrylic acid with an olefin of the formulawhereR1and R2, which may be identical or different, are methyl or ethyl and R3is H, methyl or ethyl, in homogeneous phase in the presence of an acidic catalyst and isolating the tert-C4–C8-alkyl (meth)acrylate from the reaction mixture, by a process in which the catalyst is separated off as residue by a two-stage distillation of the reaction mixture and the tert-C4–C8-alkyl (meth)acrylate is isolated from the distillates.The novel process makes it possible to use acetic acid-containing (meth)acrylic acid. The danger of cleavage of the ester and of polymerization of (meth)acrylic compounds is reduced.
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Houben-Weyl Methoden Der Organischen Chemie, vol. 8, pp. 534-536 1952.
Kroker Ruprecht
Nestler Gerhard
Schmitt Werner
Schumm Winfried
BASF - Aktiengesellschaft
Manoharan Virginia
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