Process for the preparation of 3,5-di-tert-butyl-4-hydroxy methoxybenzyl
alcohol
    3.
    发明授权
    Process for the preparation of 3,5-di-tert-butyl-4-hydroxy methoxybenzyl alcohol 失效
    3,5-二叔丁基-4-羟基甲氧基苄醇的制备方法

    公开(公告)号:US5364974A

    公开(公告)日:1994-11-15

    申请号:US171354

    申请日:1993-12-21

    IPC分类号: C07C43/315 C07C43/02

    CPC分类号: C07C43/315

    摘要: Claimed is a process for the preparing 3,5-di-tert-butyl-4-hydroxy-methoxybenzyl alcohol which is an effective stabilizer of polymer materials and a starting compound in synthesis of high- effective polynuclear phenolic stabilizers.It is an object of this invention to provide a simplification of the process and improve a quality of the target product.This object is attained by using N,N,N',N'-tetra-methyl-methylene-bis-amine as a catalyst with the molar ratio of 2,6-DTBP to formaldehyde to methanol to bis-amine as of 1.0:1.0-1.5:10-15: 0.01-0.50 and conducting a process at 60.degree.-100.degree. C.

    摘要翻译: 要求的是制备作为高分子材料的有效稳定剂的3,5-二叔丁基-4-羟基 - 甲氧基苄醇和合成高效多核酚类稳定剂的起始化合物的方法。 本发明的一个目的是提供一种简化的方法并提高目标产品的质量。 该目的通过使用N,N,N',N'-四甲基亚甲基双胺作为催化剂,其摩尔比为2,6-DTBP与甲醛至甲醇至双胺为1.0: 1.0-1.5:10-15:0.01-0.50,在60°-100℃进行。

    Process for purifying isoprene
    4.
    发明授权
    Process for purifying isoprene 失效
    异戊二烯净化方法

    公开(公告)号:US4232182A

    公开(公告)日:1980-11-04

    申请号:US853816

    申请日:1977-11-21

    摘要: A process for purifying isoprene produced by catalytic decomposition of dimethyldioxane from carbonyl compounds and cyclopentadiene which involves passing isoprene at a temperature of 40.degree. to 70.degree. C. through a bed of a solid product such as an anion exchange resin or alkali (the latter may be used with or without an inert carrier), followed by subjecting the isoprene to close fractionation performed with at least 50 theoretical plates and at a reflux ratio of at least 3. The process of the present invention enables practically complete purification of isoprene from carbonyl compounds and cyclopentadiene. The purified isoprene, when used as a monomer in the production of stereospecific isoprene rubber, results in high-quality products; and reduces by a factor of 2-3 the Ziegler catalyst consumption in the isoprene rubber synthesis.

    摘要翻译: 通过羰基化合物和环戊二烯催化分解二甲基二恶烷产生的异戊二烯的方法,该方法涉及通过异戊二烯在40℃至70℃的温度下通过固体产物如阴离子交换树脂或碱的床(后者可以 与惰性载体一起使用或不使用惰性载体),然后使异戊二烯进行至少50个理论塔板和回流比至少为3的分馏。本发明的方法使得能够从羰基化合物实际上完全纯化异戊二烯 和环戊二烯。 当纯化的异戊二烯在立体特异性异戊二烯橡胶的制备中用作单体时,产生高品质的产品; 并在异戊二烯橡胶合成中降低了齐格勒催化剂消耗量的2-3倍。