摘要:
In a process for removing iodide compounds from a liquid composition comprising carboxylic acids having 2 to 6 carbon atoms or anhydrides thereof, by passing the liquid composition through a silver, mercury, palladium and/or rhodium-exchanged strong acid cation exchange resin, prior to contacting with the metal-exchanged resin the composition is contacted with a cation exchanger in the acid form to remove at least a portion of the metal ion contaminants in the liquid composition which have been found to displace the silver, mercury, palladium and/or rhodium from the metal-exchanged resin.
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:
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:
Corrosion metal contaminants are removed from a liquid composition comprising a carboxylic acid and/or an anhydride thereof, a rhodium carbonylation catalyst, and a carbonylation catalyst co-promoter by using a chelating resin selective for the removal of corrosion metals rather than carbonylation catalyst and co-promoter.
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。