申请人:Amylum Belgium, N.V.
公开号:US06071728A1
公开(公告)日:2000-06-06
The invention provides a process for the preparation of aspartic acid via a fermentation process for the preparation of ammonia fumarate, wherein the pH of the fermentation broth is controlled by the addition of a calcium base to produce a calcium fumarate precipitate, characterized in that ammonium fumarate is produced by separating the precipitated calcium fumarate from the fermentation broth, and reacting the same with a reagent selected from ammonia, ammonium carbonate, ammonia in combination with CO.sub.2 and mixtures therefore, to form ammonium fumarate and a co-product selected from calcium carbonate and calcium hydroxide, wherein the energy of indirect neutralization of fumaric acid by ammonia serves as the driving force for the conversion of calcium fumarate to the desired ammonium fumarate product and for the regeneration of a calcium base reagent, and wherein diammonium fumarate is enzymatically converted to ammonium aspartate and acidulated to from aspartic acid.
本发明提供了一种通过发酵制备氨丙烯酸盐的过程来制备天冬氨酸的方法,其中通过加入钙基物质来控制发酵液的pH值以产生钙丙烯酸盐沉淀,其特征在于通过从发酵液中分离沉淀的钙丙烯酸盐,并将其与氨、碳酸铵、氨和二氧化碳的混合物中选择的试剂反应,形成氨丙烯酸盐和钙碳酸盐和钙氢氧化物的共产物,其中氨通过间接中和丙烯酸的能量作为驱动力,使钙丙烯酸盐转化为所需的氨丙烯酸盐产品并再生钙基物质,而且通过酶催化将双氨基丙烯酸盐转化为天冬氨酸并酸化。