Sequential hydrothermal liquifaction (SEQHTL) for extraction of superior bio-oil and other organic compounds from oleaginous biomass
AssigneeWashington State University
InventorsShulin Chen, Moumita Chakraborty, Chao Miao
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Abstract
Methods of producing bio-fuel and other high-value products from oleaginous biomass (e.g. algae biomass) are provided. The two-step methods use a first step of subcritical water extraction of the biomass at low temperatures to produce polysaccharides and other high value products of interest, followed by, ii) hydrothermal liquefaction of remaining solid biomass at high temperatures to produce bio-oil.
Claims18
A process for obtaining polysaccharides from oleaginous biomass comprising
- heating a mixture consisting of oleaginous biomass and an aqueous medium to a temperature in the range of from 155 to 165° C.;
- maintaining said mixture at said temperature for a period of time of from 15 to 25 minutes;
- then
- recovering polysaccharides released from said oleaginous biomass from said mixture.
A process for obtaining bio-oils from oleaginous biomass comprising
- separating a liquid fraction of an aqueous mixture comprising oleaginous biomass from a solid fraction of said aqueous mixture;
- heating an aqueous mixture comprising said solid fraction of said mixture to a temperature in the range of from 237 to 243° C.;
- maintaining said mixture at said temperature for a period of time of from 15 to 25 minutes;
- and
- recovering bio-oils produced during said step of maintaining.
A method for obtaining polysaccharides and bio-oils from oleaginous biomass, comprising
- i) heating an aqueous mixture comprising said oleaginous biomass to a first temperature in the range of from 155 to 165° C.;
- ii) maintaining said aqueous mixture comprising said oleaginous biomass at said first temperature for a first period of time of from 15 to 25 minutes;
- iii) separating a liquid fraction of said aqueous mixture comprising said oleaginous biomass from a solid fraction of said mixture;
- iv) recovering polysaccharides released from said oleaginous biomass from said liquid fraction,
- v) heating an aqueous mixture comprising said solid fraction to a second temperature in the range of from 237 to 243° C.;
- vi) maintaining said aqueous mixture comprising said solid fraction at said second temperature for a second period of time of from 15 to 25 minutes;
- and
- vii) recovering, from said aqueous mixture comprising said solid fraction, bio-oils produced during said steps of v) heating and vi) maintaining.
Dependencies are inferred from the claim text.