Improving Glucose Yield By Fractionation of Biomass With Non-Cl? Ionic Liquids

International Congress on Energy (ICE)
AIChE Annual Meeting
November 4, 2013 - 2:15pm-2:30pm

Lignocellulosic biomass is a sustainable , available energy resource that is mostly carbon-neutral. To convert it to liquid fuels by biochemical means , however , requires pretreatment of biomass to remove lignin to enhance the availability of cellulose. Most standard lignin removal processes use either high temperatures and pressures , hazardous acids or alkalis , or some combination of these steps. Ionic liquids are molten salts with melting points below 100 ºC , some of which have been shown to dissolve lignin. However,  many such ionic liquids frequently contain Clˉ ions , which can interfere with downstream processing , e.g. , enzymatic hydrolysis.  Ionic liquids , with their low vapor pressures and potential for recycling , are a green alternative for lignin removal at low temperatures.  In this study , the effects of non- Clˉ containing ionic liquids 1-ethyl-3- methylimidazolium acetate (EMIM Ac) , 1-ethyl-3- methylimidazolium formate (EMIM Formate) , and 1-ethyl-3-methylimidazolium lactate (EMIM Lactate) were examined.  The biomass studied were rice hulls , corn stover , switchgrass , loblolly pine , and poplar. The experiments used a 10% (w/w) loading of biomass in ionic liquid , a temperature of 110ºC , and a fractionation time of 3 hours. The effects of biomass type and ionic liquid type were investigated by performing enzymatic hydrolysis on raw and pretreated biomass types.   The non- Clˉ containing ionic liquids removed  up to 98% of the lignin from biomass , which would be expected to make cellulose more available for further processing. However , EMIM lactate was less effective than  EMIM Ac and EMIM Formate for each biomass type. When enzymatic hydrolysis was performed , only biomass pretreated with EMIM Ac and EMIM Formate showed greatly improved glucose yield compared to the raw biomass. This pretreatment step using environmentally-friendly ,  non- Clˉ ionic liquids to remove lignin enables a  green  pathway from lignocellulosic biomass through enzymatic hydrolysis and fermentation to biofuels.  This pretreatment step might permit more cost effective cellulosic biofuels.

Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.


Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members Free Free access