摘要:
In a process for the production of acetic acid by carbonylation of methanol and/or its reactive derivative in the liquid phase in the presence of an iridium carbonylation catalyst, a methyl iodide co-catalyst and a promoter, the beneficial effect of the promoter is enhanced by continuously maintaining in the liquid reaction composition, no greater than 6.5 % by weight water, 1 to 35 % by weight methyl acetate and 4 to 20 % by weight methyl iodide.
摘要:
A process for the carbonylation of a C 1 to C 4 alkyl alcohol and/or a reactive derivative thereof by contacting a C 1 to C 4 alkyl alcohol and/or a reactive derivative thereof with carbon monoxide in a liquid reaction composition in a carbonylation reactor in the presence of (a) a rhodium catalyst, (b) an alkyl halide, and (c) as promoter, at least one of ruthenium and osmium.
摘要:
This invention relates to acetonitrile purification via an adsorption-based process. The process comprises pretreating the acetonitrile containing organic impurities such as unsaturated nitriles with a solid reagent to selectively convert the unsaturated nitriles into products more easily removed and passing the treated acetonitrile through a series of adsorbent beds to remove the resulting products and other impurities present from the acetonitrile.
摘要:
This invention relates to a process for preparing an attrition resistant vanadium-antimony oxide catalyst by adding to a vanadium-antimony oxide catalyst slurry a lithium compound which upon contact with the aqueous catalyst slurry provides hydroxide, such as lithium hydroxide or lithium carbonate. The process comprises the steps of preparing a catalyst slurry comprising vanadium oxide and antimony oxide, adding the lithium compound to the catalyst slurry, concentrating the catalyst slurry to increase the solids content of the slurry, and drying the catalyst slurry to form attrition resistant particles of catalyst.
摘要:
A process for separating components of a liquid mixture comprising a more adsorbable component (A), for example C₁ to C₆ 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羧酸和较不易吸附的组分(B)例如水的液体混合物的组分的方法,其中组分(A),组分 (B)和解吸液体(D)相对于吸附塔中的吸附剂是D> A> B,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)不混溶的解吸液体(D)漂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。
摘要:
A process for purifying an iodide-contaminated carboxylic acid and/or anhydride fraction obtained by liquid phase carbonylation using a carbonylation catalyst, an iodine-containing promoter and optional iodine-containing cop- romoter comprises vapourising the fraction after it has been freed of catalyst, feedstock and promoter components to produce a vapour acid and/or anhydride fraction having reduced iodide contamination.
摘要:
In an integrated process for the production of methyl acetate for downstream utilisation in which methanol and acetic acid are reacted in an esterification reactor and the methyl acetate is recovered by distillation and the water recovered by azeotropic distillation, the process is operated in 'standby' mode by shutting off the methanol and acetic acid feeds to the esterification reactor and recycling the methyl acetate and water to the esterification reactor so that the process may be rapidly re-started.
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:
The use of an iodide compound of Group IA or Group IIA of the Periodic Table of the Elements or of hydrogen or aluminium to suppress the volatility of water relative to acetic acid in a process for the recovery of acetic acid from a composition comprising acetic acid and water by partitioning and separating the composition into vapour and liquid phases, with the iodide compound in the liquid phase.