دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n pi: naturally occurring special lignite. e.g., leonardite. that is produced by strip mining from special lignite deposits. The active ingredient is the humic acids. Mined lignins are used primarily as thinners. which mayor may not be chemically modified;however, they are also widely used as emulsifiers.