公开(公告)号：US20140121359A1

公开(公告)日：2014-05-01

申请号：US14066985

申请日：2013-10-30

申请人： John C. Blackburn ,  Michael A. Lake ,  Mark C. Thies ,  Julian Velez-Guillen

发明人： Mark C. Thies ,  Julian Velez-Guillen ,  John C. Blackburn ,  Michael A. Lake

IPC分类号： C07G1/00

CPC分类号： C07G1/00

摘要： There are provided processes for recovering a “heart-cut” liquid-lignin fraction from a lignin-containing stream such as a black liquor stream from a paper making process or the crude lignin stream within a non-destructive biomass conversion process by carbonating, acidifying and recovering the liquid-lignin fraction. The processes generally include reacting black liquor with a carefully selected amount of carbon dioxide (CO2), to decrementally reduce the pH of the black liquor and produce fractions of a dense liquid-lignin precipitate at each pH decrement to about a pH of 8. The sequential reduction in pH is less than or equal to about 1.5 in most embodiments, less than 1.0 in other embodiments, and less than 0.50 in still other embodiments. It has been discovered that lignin recovered from the dense liquid-lignin precipitate at the different pH decrements can have different molecular weight ranges and/or structures. This process provides an improved lignin with a more narrow distribution of molecular weight, melt point, and chemical structure that is more suitable for high-value polymer applications.

摘要翻译： 提供了从含有木质素的物流（例如来自造纸工艺的黑液流）或非破坏性生物质转化过程中的粗木质素流中回收“心切”液体木质素部分的方法，该方法是通过碳酸化，酸化 并回收液态木质素馏分。 方法通常包括使黑液与仔细选择量的二氧化碳（CO 2）反应，以逐渐降低黑液的pH并在每个pH降低至约pH8时产生致密的液体 - 木质素沉淀物的馏分。 在大多数实施方案中，pH的连续降低小于或等于约1.5，在其它实施方案中小于1.0，在其它实施方案中小于0.50。 已经发现，在不同pH降低下从致密液体木质素沉淀回收的木质素可以具有不同的分子量范围和/或结构。 该方法提供了更加适用于高价值聚合物应用的分子量，熔点和化学结构分布更窄的木质素。