The EPA is seeking at Hemp as a Developing Material


Hemp fiber employed in concrete

Concrete is a incredibly power intensive material to make. Hemp concrete would be a terrific option.

A Green Chemistry Strategy to Pulping Hemp as an Industrially Relevant Renewable Fiber for Building

EPA Grant Quantity: SU839468
Title: A Green Chemistry Strategy to Pulping Hemp as an Industrially Relevant Renewable Fiber for Building
Investigators: Cai, Dr.Charles
Institution: University of California – Riverside
EPA Project Officer: Web page, Angela
Phase: I
Project Period: December 1, 2018 via November 30, 2019
Project Quantity: $12,198


Hemp fibers are an particularly sturdy material, boasting higher lateral tensile strength, durability, and strength-to-weight ratio with research currently proving its possible as an productive renewable building material for future buildings. Hemp fiber is an exceptional material for its sustainability as properly as its helpful properties and is a rotational crop that grows with no the use of pesticides, requiring substantially much less water than most crops. The existing commercialized mechanism for creating industrial fibers from hemp is by the Kraft pulping approach, a process matured by the paper pulp market. This chemical pulping approach requires the delignification of hemp fibers by treating hemp stalks with hot water, sodium hydroxide, and sodium sulfide across various actions. This mixture breaks the bonds that hyperlink lignin, hemicellulose, and cellulose- all of which make up the chemical composition of hemp. The Kraft pulping technique supplies adequate delignification of hemp having said that, the approach demands a lot of added power and price intensive actions to decrease hazardous waste emissions, such as black liquor, that negatively effect the atmosphere. In reality, 7 tons of black liquor is made for each ton of pulp, containing concentrated sulfides necessary for the pulping approach. In order to reuse these chemical substances, pulping plants commit substantial amounts of power into boiling the liquor into solids containing lignin and sulfides. As soon as boiled, the remaining residue is burned. This step releases organic sulfides, HtwoS, SOtwo, VOCs, NOx, and other pollutants into the atmosphere. Combustion of lignin also emits substantial quantities of CO2 due to lignin’s 80% carbon weight ratio.


Our proposed hemp pulping approach makes use of Co-solvent Enhanced
Lignocellulosic Fractionation (CELF) technologies to enable for significantly
cleaner and more rapidly pulping of hemp fibers with no the production of
black liquor. CELF is a 1-step approach that fractionates lignin from
plant biomass at low temperatures employing renewable tetrahydrofuran
(THF) in mixture with incredibly dilute sulfuric acid to help in
delignification of hemp fibers. CELF delignification overall performance is
comparable to that of the Kraft pulping approach even though also creating a
helpful fermentable sugar option as a byproduct, as a result permitting far more
of the original hemp to be employed just before waste therapy. Soon after the CELF
reaction, dilute acid is neutralized with calcium carbonate to make
gypsum and THF can be recovered by space temperature vacuum
distillation. The lignin from CELF is also a significantly purer far more refined
solution than lignin recovered from Kraft pulping. As soon as pretreated, the
hemp fibers can be added to cement as a reinforcing agent or employed on
its personal in production of drywall or structural reinforcements, the
hemp CELF lignin can be employed as resin binders and concrete additive.

Anticipated Final results:

Our project purpose is to make, hempcrete, as a lighter, stronger,
and far more environmentally friendly option to standard
fossil-primarily based concrete.

Contribution to Pollution Prevention or Handle: Our proposed approach promises to decrease power consumption and hazardous emissions related with the standard Kraft pulping approach.

EPA document

Discover far more about industrial hemp in the Hemp University or by going to the “What is hemp?” web page. Also appear at the expanding hemp section to find out far more about how hemp is grown and processed.


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