Process for preparing unsaturated diesters
    2.
    发明授权
    Process for preparing unsaturated diesters 失效
    制备不饱和二酯的方法

    公开(公告)号:US4131743A

    公开(公告)日:1978-12-26

    申请号:US702935

    申请日:1976-07-06

    IPC分类号: B01J23/44 C07C69/00 C07C67/05

    CPC分类号: B01J23/44 C07C67/055

    摘要: Unsaturated diesters are produced by a process which comprises reacting, in a flowing gaseous phase, a gaseous mixture comprising a conjugated diene, a carboxylic acid and molecular oxygen in the presence of (A) a catalyst comprising palladium, vanadium, antimony and at least one alkali metal carboxylate, or in the presence of (B) a catalyst comprising palladium, vandium, antimony, at least one alkali metal carboxylate and at least one alkali metal halide. The catalyst (A) maintains a high activity and a high selectivity for a long time. The catalyst (B), in which further the alkali metal halide is added, shows a higher activity and a higher selectivity for a longer time. And its activity and selectivity are stable and durable at high temperatures such as 160.degree. - 200.degree. C. Furthermore, the addition of the alkali metal halide suppresses combustion reaction of dienes such as butadiene remarkably. Additionally, the catalysts (A) and (B), especially (B) can be easily reactivated when they lose activity.

    摘要翻译: 在(A)包含钯,钒,锑和至少一种催化剂的催化剂的存在下,在流动的气相中使包含共轭二烯,羧酸和分子氧的气体混合物反应来制备不饱和二酯 碱金属羧酸盐或在(B)包含钯,钪,锑,至少一种碱金属羧酸盐和至少一种碱金属卤化物的催化剂存在下进行。 催化剂(A)长时间保持高活性和高选择性。 其中加入碱金属卤化物的催化剂(B)在较长时间内显示出较高的活性和更高的选择性。 其活性和选择性在160〜200℃的高温下是稳定和耐用的。此外,加入碱金属卤化物可显着抑制丁二烯如燃烧反应。 此外,催化剂(A)和(B),特别是(B)可以在它们失去活性时容易地再活化。