PROCESSES AND CATAYLSTS FOR THE SELECTIVE HYDROGENATION OF COMPOUNDS HAVING CARBONYL CARBON ATOMS

    公开(公告)号:US20220064136A1

    公开(公告)日:2022-03-03

    申请号:US17421492

    申请日:2020-01-09

    Abstract: Selective hydrogenation processes are disclosed that can upgrade impure feeds, such as those obtained from biomass and containing a number of small (e.g., 2-6 carbon atom) molecules having aldehyde and/or ketone carbon atoms. For example, whereas glycolaldehyde and its methylated derivative, hydroxyacetone (acetol) are both high value intermediates for certain downstream processing reactions, they are normally recovered in a condensate from pyrolysis of carbohydrates (e.g., aldose-containing sugars) together with glyoxal and its methylated derivative, pyruvaldehyde. The selective hydrogenation of these compounds bearing two carbonyl carbon atoms, without over-hydrogenation to ethylene glycol and propylene glycol, can increase the concentration of the desired intermediates. These beneficial effects of selective hydrogenation may be achieved through the use of a hydrogenation catalyst comprising noble metals such as Ru and Pt.

    MULTIPHASE LOW MIXING PROCESSES
    3.
    发明申请
    MULTIPHASE LOW MIXING PROCESSES 审中-公开
    多相低混合工艺

    公开(公告)号:US20150251980A1

    公开(公告)日:2015-09-10

    申请号:US14709591

    申请日:2015-05-12

    Abstract: A process is described for improving the performance of certain multiphase reaction systems including a solid catalyst, one or more reactants in the gas phase and one or more reactants in the liquid phase, wherein a targeted maximum concentration of a reactant in the liquid phase is identified for providing improved value in terms of byproduct formation, catalyst deactivation and yields of desired products, and this targeted concentration is closely approached and preferably achieved, but not substantially exceeded, downstream in a continuous process or later in time from the initiation of a batch in a semibatch mode of operation of such processes.

    Abstract translation: 描述了一种用于改善某些多相反应体系(包括固体催化剂,气相中的一种或多种反应物和液相中的一种或多种反应物)的性能的方法,其中确定液相中反应物的目标最大浓度 为了在副产物形成,催化剂失活和所需产物的产率方面提供改进的价值,并且该目标浓度在连续方法中的下游或在批次的开始后的较短时间内接近并优选地实现,但是基本上不超过 这种过程的半匹配操作模式。

    IMPROVED PROCESS OF MAKING BIODERIVED PROPYLENE GLYCOL
    5.
    发明申请
    IMPROVED PROCESS OF MAKING BIODERIVED PROPYLENE GLYCOL 审中-公开
    生物降解丙烯甘油的改进方法

    公开(公告)号:US20170036975A1

    公开(公告)日:2017-02-09

    申请号:US15304666

    申请日:2015-04-09

    CPC classification number: C07C29/60 C07C29/1512 C07C31/205

    Abstract: An improved process for making bioderived propylene glycol from a feed composition including at least one of lactic acid, glycerol, a five carbon sugar, a five carbon sugar alcohol, a six carbon sugar and a six carbon sugar alcohol, wherein production of four carbon and higher diols is reduced by adding base after the initiation of the reaction. In preferred embodiments, the process pH and other process conditions are initially established at targeted values for obtaining the highest conversion for a given catalyst consistent with the production of substantially no pentanediol byproducts in the product mixture, and base is added thereafter to control the process pH proximate to the initially targeted value.

    Abstract translation: 一种从包含乳酸,甘油,五碳糖,五碳糖醇,六碳糖和六碳糖醇中的至少一种的饲料组合物制备生物活性丙二醇的改进方法,其中生产四碳和 在反应开始后加入碱来降低高级二醇。 在优选的实施方案中,工艺pH和其它工艺条件最初建立在目标值下,以获得与产物混合物中基本上不含戊二醇副产物的生产一致的给定催化剂的最高转化率,然后加入碱以控制工艺pH 接近最初的目标值。

    Processes and catalysts for the selective hydrogenation of compounds having carbonyl carbon atoms

    公开(公告)号:US12065417B2

    公开(公告)日:2024-08-20

    申请号:US17421492

    申请日:2020-01-09

    CPC classification number: C07D307/42 B01D3/40 C07C45/64

    Abstract: Selective hydrogenation processes are disclosed that can upgrade impure feeds, such as those obtained from biomass and containing a number of small (e.g., 2-6 carbon atom) molecules having aldehyde and/or ketone carbon atoms. For example, whereas glycolaldehyde and its methylated derivative, hydroxyacetone (acetol) are both high value intermediates for certain downstream processing reactions, they are normally recovered in a condensate from pyrolysis of carbohydrates (e.g., aldose-containing sugars) together with glyoxal and its methylated derivative, pyruvaldehyde. The selective hydrogenation of these compounds bearing two carbonyl carbon atoms, without over-hydrogenation to ethylene glycol and propylene glycol, can increase the concentration of the desired intermediates. These beneficial effects of selective hydrogenation may be achieved through the use of a hydrogenation catalyst comprising noble metals such as Ru and Pt.

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