Process for producing a carboxylic acid ester by reacting an aldehyde and an alcohol using a palladium type catalyst
    1.
    发明授权
    Process for producing a carboxylic acid ester by reacting an aldehyde and an alcohol using a palladium type catalyst 有权
    通过使用钯型催化剂使醛和醇反应制备羧酸酯的方法

    公开(公告)号:US06348619B1

    公开(公告)日:2002-02-19

    申请号:US09230355

    申请日:1999-01-25

    IPC分类号: C07C6700

    CPC分类号: C07C67/39

    摘要: A carboxylic acid ester is prepared by a process comprising: reacting an aldehyde and an alcohol in a liquid phase in the presence of molecular oxygen as indicated by the following reaction: RCHO+R′OH+O2→RCOOR′+H2O in the presence of a catalyst comprising at least palladium and an element X, wherein X is bismuth, lead or a combination thereof, supported on a carrier, wherein the catalyst has an acid strength, pKa, of more than 4.8 and shows an ammonia chemical adsorption amount at 0° C. of 0-150 &mgr;mol/g-catalyst.

    摘要翻译: 羧酸酯的制备方法包括:在分子氧存在下,在液相中使醛和醇反应,如以下反应所示:在至少包含钯和元素X的催化剂存在下,其中 X是负载在载体上的铋,铅或其组合,其中催化剂的酸强度pKa大于4.8,在0℃下显示出0-150Mumol / g催化剂的氨化学吸附量 。

    Catalyst for bisalkoxycarbonylation of olefins, and method for production of succinate derivatives
    5.
    发明授权
    Catalyst for bisalkoxycarbonylation of olefins, and method for production of succinate derivatives 失效
    用于烯烃的双烷氧基羰基化的催化剂和琥珀酸酯衍生物的制备方法

    公开(公告)号:US06288268B1

    公开(公告)日:2001-09-11

    申请号:US09661294

    申请日:2000-09-13

    IPC分类号: C07C6700

    摘要: A catalyst for the bisalkoxycarbonylation of olefins comprising a noble metal compound and a phosphine chalcogenide of the following formula (1): wherein each of R1, R2 and R3 is, independently, an alkyl group or an aryl group each of which may have a substituent, and A is a Group 16 element of the Periodic Table; and R1, R2 or R3 may be combined, directly or through a bridging group, with one another where the groups to be combined may be attached either to an identical phosphorus atom or to different phosphorus atoms. Element A includes oxygen, sulfur and selenium atoms. The noble metal compound includes palladium(II) halides and other palladium compounds. The catalyst may further include a copper(I) halide or other copper compound as a co-catalyst. The use of this catalyst can provide the bisalkoxycarbonylation of olefins with efficiency.

    摘要翻译: 用于烯烃的双烷氧羰基化的催化剂,其包含贵金属化合物和下式(1)的膦硫属化物:其中R 1,R 2和R 3各自独立地为可以具有取代基的烷基或芳基 A为元素周期表第16组元素; R 1,R 2或R 3可以直接或通过桥连基团彼此组合,其中待组合的基团可以连接到相同的磷原子或不同的磷原子上。 元素A包括氧,硫和硒原子。 贵金属化合物包括卤化钯(II)和其它钯化合物。 催化剂可以进一步包括作为助催化剂的卤化铜(I)或其它铜化合物。 使用这种催化剂可以有效地提供烯烃的双烷氧基羰基化。

    Method for depolymerizing polymethylmethacrylate
    7.
    发明授权
    Method for depolymerizing polymethylmethacrylate 失效
    聚甲基丙烯酸甲酯解聚方法

    公开(公告)号:US06469203B1

    公开(公告)日:2002-10-22

    申请号:US09787088

    申请日:2001-06-21

    IPC分类号: C07C6700

    CPC分类号: C07C67/333 C07C69/54

    摘要: The present invention relates to a process of recovering monomeric esters of substituted or unsubstituted acrylic acid from polymer material having corresponding structural units by depolymerization by means of a fine-grained heat-transfer medium which is maintained above the depolymerization temperature of the polymer material. In a reactor, the polymer material is brought in contact with hot, mechanically fluidized heat-transfer medium. The resulting vapors are withdrawn and condensed, where the hot heat-transfer medium is continuously supplied at one end of the reactor, and cooled heat-transfer medium is discharged at the other end.

    摘要翻译: 本发明涉及通过采用保持在聚合物材料的解聚温度以上的细粒度传热介质进行解聚而从具有相应结构单元的聚合物材料中回收取代或未取代的丙烯酸的单体酯的方法。 在反应器中,聚合物材料与热的机械流化的热传递介质接触。 所得到的蒸气被抽出和冷凝,其中热传递介质在反应器的一端连续供应,并且冷却的传热介质在另一端排出。

    Process for producing propionic acid derivatives
    9.
    发明授权
    Process for producing propionic acid derivatives 失效
    丙酸衍生物的制备方法

    公开(公告)号:US06242635B1

    公开(公告)日:2001-06-05

    申请号:US09156900

    申请日:1998-09-18

    IPC分类号: C07C6700

    摘要: A process for producing a 2-aralkyl-3-hydroxypropionic acid (or its ester), comprising the steps of: reacting a 3-hydroxy-2-methylene-3-arylpropionic acid ester, easily obtained by the reaction of an arylaldehyde with an acrylic acid ester, with an acid anhydride to form a 2-aralkylidene-3-acyloxypropionic acid ester; subjecting the same to hydrolysis or alcoholysis; and reducing the resulting 2-aralkylidene-3-hydroxypropionic acid or its ester. The reduction step may be conducted in the presence of a base.

    摘要翻译: 一种2-芳烷基-3-羟基丙酸(或其酯)的制备方法,包括以下步骤:将通过芳基醛反应容易得到的3-羟基-2-亚甲基-3-芳基丙酸酯与 丙烯酸酯与酸酐反应形成2-芳烷叉-3-酰氧基丙酸酯; 使其同时进行水解或醇解; 并减少所得2-亚烷基-3-羟基丙酸或其酯。 还原步骤可以在碱的存在下进行。

    Basic clay catalyst for the production of pentylglycol monoesters
    10.
    发明授权
    Basic clay catalyst for the production of pentylglycol monoesters 有权
    用于生产戊二醇单酯的基础粘土催化剂

    公开(公告)号:US06215020B1

    公开(公告)日:2001-04-10

    申请号:US09343215

    申请日:1999-06-30

    IPC分类号: C07C6700

    摘要: The invention is a base-modified clay that selectively catalyzes the formation of a glycol monoester from an aldehyde. The base-modified clay comprises a clay having secluded conjugate base sites and exchangeable interstitial cationic spaces. In the base-modified clay, the interstitial hydroxyl groups have been converted to oxide sites, at least one structural hydroxyl group has been converted to an oxide site. The base-modified clay contains sufficient conjugate base cations to balance the charge of said oxide groups. Processes for preparing the base-modified clay are described. The invention also provides a process for preparing a glycol monoester. This process includes heating in a reaction vessel an aldehyde and a catalytic amount of the base-modified clay under conditions sufficient to produce a glycol monoester.

    摘要翻译: 本发明是一种碱性改性的粘土,其选择性地催化由醛形成二醇单酯。 碱改性粘土包括具有隐蔽共轭碱基位点和可交换的间隙阳离子空间的粘土。 在基础改性粘土中,间隙羟基已经转化为氧化物位点,至少一个结构羟基已转化为氧化物位点。 碱改性粘土含有足够的共轭碱阳离子以平衡所述氧化物基团的电荷。 描述了制备基础改性粘土的方法。 本发明还提供了制备二醇单酯的方法。 该方法包括在足以产生二醇单酯的条件下在反应容器中加热醛和催化量的碱改性的粘土。