Liquor, desugared spent

As the result of many experiments, we concluded that a 55% concentrate of desugared, spent liquor was the best lignin starting material, based on cheapness and paste oil recovery. We also concluded that light oils (containing many hydrocarbons, etc. such as cyclohexane and benzene),... 

Since the cost study of the process using a two-stage desulfonated, de-ashed lignin showed that this lignin was too expensive, we decided to use a less costly lignin starting material. We decided to use either a concentrated, desugared sulfite-spent liquor or the dried solids from such a liquor. 

Most of our later work was done using this cheapest desulfonated lignin. We did find that a desugared, spray-dried spent liquor worked better than spent-liquor solids dried by merely heating in an oven. The spray-dried product was used for occasional experiments. 

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