SEPARATION OF ORGANIC ACIDS FROM MIXTURES CONTAINING AMMONIUM SALTS OF ORGANIC ACIDS
申请人:LALI Arvind Mallinath
公开号:US20180162797A1
公开(公告)日:2018-06-14
The invention relates to a process for separation of organic acids from mixture of ammonium salts of one or more organic acids and other compounds via an integrated process. The process involves suspending mixture of ammonium salts of one or more organic acids and other compounds in dry hydrocarbon solvent/s or mixtures thereof; wherein the selected hydrocarbon solvent/s or mixtures thereof have boiling point more than 100° C. and forms an azeotrope with water. The reaction mixture thus obtained is dehydrated azeotropically followed by esterification of basic salt of the organic acids by addition of alcohol in presence of metal or metal salt; thereafter the individual esters formed are separated by distillation and hydrolysed to obtain corresponding organic acids having more than 98% purity.
A dietary source of mineral in the form of a metal carboxylate is prepared using the acid-base-like reaction. A salt of a carboxylate anion and a by-product cation is reacted in aqueous solution with a salt of a metal cation and a by-product anion under conditions which form a metal carboxylate and the by-product salt. Solutions formed in the reaction may be applied directly to a dry carrier to produce a dry dietary supplement or, alternatively, the solutions may be filtered to remove precipitated by-product salt and the filtrate used as a liquid dietary supplement. Preferably, a reducing agent, such as ascorbic acid, is added to help prevent the oxidation of divalent to trivalent form of a metal salt, when an easily oxidized divalent metal is used as starting material.
Crystal Structures of Ammonium Propionates: (NH4)[HProp2] and (NH4)Prop (Prop– = C2H5COO–)
作者:M. P. Kendin、D. M. Tsymbarenko
DOI:10.1134/s0022476623040145
日期:2023.4
Abstract Two crystalline compounds - (NH4)HProp2 and (NH4)Prop (HProp = C2H5COOH) are obtained by the interaction of ammonia with propionic acid. Their crystalstructures are determined by X-ray diffraction. Both compounds crystallize in the monoclinic crystal system (space groups C2/c and P21/n respectively) and consist of alternating \(\textNH}_4}^+}\) and Prop– ions (or hydrogen-bonded pairs
摘要 两种结晶化合物 - (NH 4 )HProp 2和 (NH 4 )Prop (HProp = C 2 H 5 COOH) 是通过氨与丙酸的相互作用获得的。它们的晶体结构由 X 射线衍射确定。两种化合物均在单斜晶系(分别为空间群C 2/ c和P 2 1 / n)中结晶,并由交替的\(\textNH}_4}^+}\)和丙-离子(或氢键对 Prop–H⋯Prop – ) 通过氢键组织成一个 3D 框架。(NH 4的结构特征)HProp 2化合物,即酸性氢原子在丙酸根阴离子的羧基之间的位置无序,通过最大熵和DFT方法研究。与同系羧酸铵类似,(NH 4 )Prop 在大气条件下极不稳定,而(NH 4 )HProp 2酸性盐在储存期间稳定,可用于进一步合成金属丙酸盐。
Dose; Ettre, Zeitschrift fur Naturforschung, 1958, vol. 13b, p. 784,786
作者:Dose、Ettre
DOI:——
日期:——
Santalova, N. A.; Seisenbaeva, G. A.; Dunaeva, K. M., Doklady Chemistry, 1988, vol. 300, p. 182 - 184
作者:Santalova, N. A.、Seisenbaeva, G. A.、Dunaeva, K. M.、Spitsyn, V. I.