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    • 3. 发明授权
    • Process for the production of di-n-propyl-acetic acid
    • 制备二正丙基乙酸的方法
    • US4311854A
    • 1982-01-19
    • US60560
    • 1979-07-25
    • Jurgen WeberVolker FalkClaus Kniep
    • Jurgen WeberVolker FalkClaus Kniep
    • B01J21/04B01J23/00B01J31/00C07B61/00C07C1/24C07C29/145C07C45/48C07C45/50C07C51/00C07C51/235C07C51/44C07C53/128C07C67/00
    • C07C53/128C07C1/24C07C29/145C07C45/48C07C45/50C07C51/235C07C51/44C07C2521/04
    • A process for the preparation of di-n-propyl-acetic acid, comprising the steps of:A. catalytically reacting n-butyric acid with cleavage of carbon dioxide and water to form heptanone-4;B. hydrogenating heptanone-4 in teh presence of a catalyst to form heptanol-4;C. dehydrating heptanol-4 in the presence of an Al.sub.2 O.sub.3 catalyst to form heptene-3;D. hydroformylating heptene-3 in the presence of a rhodium complex compound as catalyst to form a mixture of 2-propyl pentanal and 2-ethyl hexanal;E. oxidizing the 2-propyl pentanal/2-ethyl hexanal mixture to form a mixture of di-n-propyl acetic acid and 2-ethyl hexanoic acid, andF. separating the mixture of di-n-propyl acetic acid and 2-ethyl hexanoic acid to recover pure di-n-propyl acetic acid.If desired, step B can be carried out without purification of the product of step A. Moreover, the dehydration of step C can be carried out without previous purification of the product of step B. Step D can also be carried out without purification of the product of step C.
    • 一种制备二正丙基乙酸的方法,包括以下步骤:A.将正丁酸与二氧化碳和水的裂解催化反应形成庚酮-4; B.在催化剂存在下氢化庚酮-4以形成庚醇-4; C.在Al2O3催化剂存在下脱水庚醇-4以形成庚烯-3; D.在铑络合物化合物作催化剂存在下加氢甲酰化庚烯-3,形成2-丙基戊醛和2-乙基己醛的混合物; E.氧化2-丙基戊醛/ 2-乙基己醛混合物以形成二正丙基乙酸和2-乙基己酸的混合物,和F.将二正丙基乙酸和2-乙基己酸的混合物分离, 乙基己酸,以回收纯的二正丙基乙酸。 如果需要,可以在不纯化步骤A的产物的情况下进行步骤B.此外,步骤C的脱水可以在没有预先纯化步骤B的产物的情况下进行。步骤D也可以在不纯化的情况下进行 步骤C的产物