The EPA is hunting at Hemp as a Creating Material


Hemp fiber made use of in concrete

Concrete is a really 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 incredibly robust material, boasting higher lateral tensile strength, durability, and strength-to-weight ratio with research currently proving its possible as an helpful renewable building material for future buildings. Hemp fiber is an exceptional material for its sustainability as effectively as its helpful properties and is a rotational crop that grows without having the use of pesticides, requiring substantially much less water than most crops. The existing commercialized mechanism for generating industrial fibers from hemp is by the Kraft pulping course of action, a process matured by the paper pulp business. This chemical pulping course of action entails the delignification of hemp fibers by treating hemp stalks with hot water, sodium hydroxide, and sodium sulfide across a number of 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 process offers adequate delignification of hemp nevertheless, the course of action calls for a lot of more power and price intensive actions to minimize hazardous waste emissions, such as black liquor, that negatively influence the atmosphere. In truth, 7 tons of black liquor is developed for each and every ton of pulp, containing concentrated sulfides expected for the pulping course of action. In order to reuse these chemical substances, pulping plants invest huge 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 huge quantities of CO2 due to lignin’s 80% carbon weight ratio.


Our proposed hemp pulping course of action utilizes Co-solvent Enhanced
Lignocellulosic Fractionation (CELF) technologies to permit for a great deal
cleaner and quicker pulping of hemp fibers without having the production of
black liquor. CELF is a a single-step course of action that fractionates lignin from
plant biomass at low temperatures utilizing renewable tetrahydrofuran
(THF) in mixture with really dilute sulfuric acid to help in
delignification of hemp fibers. CELF delignification overall performance is
comparable to that of the Kraft pulping course of action although also generating a
helpful fermentable sugar answer as a byproduct, as a result enabling extra
of the original hemp to be made use of ahead of waste therapy. Following the CELF
reaction, dilute acid is neutralized with calcium carbonate to create
gypsum and THF can be recovered by space temperature vacuum
distillation. The lignin from CELF is also a a great deal purer extra 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 made use of on
its personal in production of drywall or structural reinforcements, the
hemp CELF lignin can be made use of as resin binders and concrete additive.

Anticipated Benefits:

Our project target is to create, hempcrete, as a lighter, stronger,
and extra environmentally friendly option to traditional
fossil-primarily based concrete.

Contribution to Pollution Prevention or Manage: Our proposed course of action promises to minimize power consumption and hazardous emissions related with the traditional Kraft pulping course of action.

EPA document

Find out extra about industrial hemp in the Hemp University or by going to the “What is hemp?” web page. Also appear at the developing hemp section to study extra about how hemp is grown and processed.


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