Process for the production of carboxylic acid anhydrides
    2.
    发明授权
    Process for the production of carboxylic acid anhydrides 失效
    制备羧酸酐的方法

    公开(公告)号:US5360929A

    公开(公告)日:1994-11-01

    申请号:US196284

    申请日:1994-02-10

    CPC分类号: C07C51/56

    摘要: A process for the production of a carboxylic acid anhydride comprises contacting a reaction composition comprising a carboxylic acid ester, a hydrocarbyl halide and/or a hydrocarbyl ether reactant and a hydrocarbyl halide promoter with carbon monoxide in the presence of a catalyst comprising an insoluble polymer support having pendant quaternised N-base or alkylated N-oxide pyridine groups supporting a rhodium species in which process the rhodium species is prevented from leaching from the polymer support by maintaining throughout the process a finite concentration of carboxylic acid anhydride in the reaction composition.

    摘要翻译: 一种制备羧酸酐的方法包括使包含羧酸酯,烃基卤化物和/或烃基醚反应物的反应组合物和烃基卤化物助剂与一氧化碳在含有不溶性聚合物载体 具有支撑铑物质的季铵化N-碱或烷基化N-氧化物吡啶基,其中通过在整个过程中保持铑类物质在反应组合物中的有限浓度的羧酸酐,防止铑物质从聚合物载体浸出。

    Process for the production of acetic acid
    3.
    发明授权
    Process for the production of acetic acid 失效
    乙酸生产工艺

    公开(公告)号:US5416237A

    公开(公告)日:1995-05-16

    申请号:US276873

    申请日:1994-07-18

    CPC分类号: C07C51/12 C07C51/44

    摘要: In a process for the production of acetic acid by carbonylation of methanol in the presence of a rhodium carbonylation catalyst, methyl iodide and an iodide salt stabiliser the improvement resides in maintaining a finite concentration of water of up to about 10% by weight and a methyl acetate concentration of at least 2% by weight in the liquid reaction composition and recovering the acetic acid product by passing the liquid reaction composition through a flash zone to produce a vapour fraction which is passed to a single distillation column from which an acetic acid product is removed.

    摘要翻译: 在甲酸铑羰化反应催化剂存在下通过羰基化生产乙酸的方法中,甲基碘和碘化物盐稳定剂的改进在于维持高达约10重量%的有限浓度的水和甲基 乙酸盐浓度在液体反应组合物中至少为2重量%,并通过使液体反应组合物通过闪蒸区域回收乙酸产物,以产生蒸气馏分,该蒸气馏分通过乙酸产物为单一蒸馏塔 删除。

    Process for separating components of a liquid mixture
    5.
    发明授权
    Process for separating components of a liquid mixture 失效
    用于分离液体混合物的组分的方法

    公开(公告)号:US5571421A

    公开(公告)日:1996-11-05

    申请号:US277498

    申请日:1994-07-19

    IPC分类号: B01D15/00 B01D15/08

    CPC分类号: B01D15/08 B01D15/422

    摘要: A process for separating components of a liquid mixture comprising a more adsorbable component (A), for example C.sub.1 to C.sub.6 carboxylic acids, and a less adsorbable component (B), for example water, wherein the relative adsorbity of component (A), component (B) and a desorbent liquid (D) with respect to an adsorbent in an adsorption column is in the order D>A>B, which process comprises the steps in sequence of: (a) passing the liquid mixture through an adsorption column containing the adsorbent and selectively adsorbing component (A) while discharging a stream enriched in component (B); (b) rinsing the adsorbent in the adsorption column after step (a) with desorbent liquid (D) which is immiscible with component (B) whereby component (A) is displaced from adsorbent by desorbent (D) and withdrawing from the adsorption column a first liquid phase stream comprising a mixture of component (A) and component (B) and withdrawing from the adsorption column a second liquid phase stream comprising a mixture of desorbent (D) and component (A); and (c) thermally displacing desorbent (D) from the adsorbent in the adsorption column after step (b).Preferably, the desorbent (D) forms an azeotrope with component (B). Suitable adsorbents are highly micro-porous activated carbons.

    摘要翻译: 一种用于分离包含更易吸附的组分(A),例如C1至C6羧酸和较不易吸收的组分(B)例如水的液体混合物的组分的方法,其中组分(A),组分 (B)和解吸剂液体(D)相对于吸附塔中的吸附剂是D> A> B的顺序,该方法包括以下步骤:(a)使液体混合物通过含有 吸附剂和选择性吸附组分(A),同时排出富含组分(B)的物流; (b)在步骤(a)之后,用与组分(B)不混溶的解吸剂液体(D)冲洗吸附塔中的吸附剂,由此组分(A)通过解吸剂(D)从吸附剂中移出并从吸附塔中取出 第一液相物流,其包含组分(A)和组分(B)的混合物,并从吸附塔排出包含解吸剂(D)和组分(A)的混合物的第二液相物流; 和(c)在步骤(b)之后从吸附塔中的吸附剂热释放脱附剂(D)。 优选地,解吸剂(D)与组分(B)形成共沸物。 合适的吸附剂是高度微孔活性炭。