Nemaska Lithium Inc.

The Electrosynthesis Company, Inc.

Dynamic Food Ingredients Corporation

Lectro Press, Inc.

Other

Noram Engineering and Constructors Ltd.

Chemetics International Company, Ltd.

Chemical Products Corporation

Dfi USA, LLC

Benham Electrosynthesis Company, Inc.

Rockwood Lithium Gmbh

J David Genders

Peter Symons

Jean-François Magnan

Guy Bourassa

Gary Pearse

Mykolas Gladkovas

Stephen Charles Mackie

Norman L Weinberg

Geneviève Clayton

Dan M Hartsough

Jonathan A Stapley

Peter M Kendall

Duane J Mazur

Nicolas Laroche

Pierre Bouchard

Klaus Tomantschger

Robert S Feldstein

Joseph M Rait

Daniel M Atherton

Genevieve Clayton

Guillermo Daniel Zappi

William J Long

Ram Gopal

Daniel Bar

Marie-Eve Langevin

David J Buckley

Dan Atherton

Emory Sayre De Castro

Charles Adams, Jr

James M Lockhart

Lloyd Ballard Mauldin

Derek Pletcher

Rainer Aul

Bertin Ouellet

Donald R Randolph

Dennis M Chai

Ella F Spiegel

There are provided system for preparing lithium hydroxide from an aqueous composition comprising a lithium compound and use of the system thereof to prepare lithium hydroxide, the system comprising an electrochemical cell, a pH probe and at least one inlet for receiving acid or base for maintaining pH. For example, the lithium compound can be lithium sulphate and the aqueous composition can be at least substantially maintained at a pH having a value of about 2 to about 4.

Processes for preparing lithium hydroxide

There are provided processes comprising submitting an aqueous composition comprising lithium sulphate and/or bisulfate to an electrolysis or an electrodialysis for converting at least a portion of said sulphate into lithium hydroxide. During electrolysis or electrodialysis, the aqueous composition is at least substantially maintained at a pH having a value of about 1 to about 4; and converting said lithium hydroxide into lithium carbonate. Alternatively, lithium sulfate and/or lithium bisulfate can be submitted to a first electromembrane process that comprises a two-compartment membrane process for conversion of lithium sulfate and/or lithium bisulfate to lithium hydroxide, and obtaining a first lithium-reduced aqueous stream and a first lithium hydroxide-enriched aqueous stream; and submitting said first lithium-reduced aqueous stream to a second electromembrane process comprising a three-compartment membrane process to prepare at least a further portion of lithium hydroxide and obtaining a second lithium-reduced aqueous stream and a second lithium-hydroxide enriched aqueous stream.

Processes for preparing lithium carbonate

The present disclosure relates to a method for extracting lithium from a lithium-containing material. For example, the method can comprise leaching a roasted lithium-containing material under conditions suitable to obtain an aqueous composition comprising a lithium compound such as lithium sulfate and/or lithium bisulfate. The aqueous composition comprising lithium sulfate and/or lithium bisulfate can optionally be used, for example, in a method for preparing lithium hydroxide comprising an electromembrane process. The roasted lithium-containing material can be prepared, for example by a method which uses an aqueous composition comprising optionally lithium sulfate and/or lithium bisulfate which can be obtained from a method for preparing lithium hydroxide comprising an electromembrane process such as a two-compartment monopolar or bipolar electrolysis process.

Methods for treating lithium-containing materials

There are provided processes for preparing lithium hydroxide that comprise submitting an aqueous composition comprising a lithium compound to an electrolysis or an electrodialysis under conditions suitable for converting at least a portion of the lithium compound into lithium hydroxide. For example, the lithium compound can be lithium sulphate and the aqueous composition can be at least substantially maintained at a pH having a value of about 1 to about 4.

There are provided methods for preparing lithium hydroxide. For example, such methods can comprise submitting an aqueous composition comprising a lithium compound to an electrolysis under conditions suitable for converting at least a portion of said lithium compound into lithium hydroxide. There are also provided methods for preparing lithium sulphate.

The disclosure relates to methods for preparing lithium hydroxide. For example, such methods can comprise mixing a lithium-containing material with an acidic aqueous composition optionally comprising lithium sulfate and thereby obtaining a mixture; roasting the mixture under suitable conditions to obtain a roasted, lithium-containing material; leaching the roasted material under conditions suitable to obtain a first aqueous composition comprising lithium sulfate; submitting the first aqueous composition comprising lithium sulfate to an electromembrane process under suitable conditions for at least partial conversion of the lithium sulfate into lithium hydroxide and to obtain a second aqueous composition comprising lithium sulfate, the electromembrane process involving a hydrogen depolarized anode; optionally increasing concentration of acid in the second aqueous composition; and using the second aqueous composition comprising lithium sulfate as the acidic aqueous composition optionally comprising lithium sulfate for mixing with the lithium-containing material and to obtain the mixture.

A method of recovering purified partly-hydrolyzed cellulose particles from a composition comprising agglomerated partly-hydrolyzed cellulose particles and an acid, using electrodialysis. The invention addresses the problem of reducing the acid to very low levels while avoiding the high capital and operating costs, high water usage and large filtration surface area or dilution time requirements of the prior art processes. Following dilution, concentration by centrifuging or settling, and/or dialysis of the composition, the composition is treated in an electrodialysis cell to remove ions, such as free sulfate from sulfuric acid. The method may include having an anion exchange resin in the feed compartment of the electrodialysis cell, adding a base to the receiving solution in the electrodialysis cell, and a second step of electrodialysis of the purified partly-hydrolyzed cellulose particles.

Purification process for partly-hydrolyzed cellulose

Methods for simultaneously decarboxylating carbohydrate acids and reducing carbohydrate aldehydes in a divided electrochemical cell having a central compartment separate from the anode and cathode are disclosed using a cation membrane and a bipolar membrane. The improved methods are more cost-efficient and environmentally friendly.

Methods for the simultaneous electrolytic decarboxylation and reduction of sugars

Methods for decarboxylating carbohydrate acids in a divided electrochemical cell are disclosed using a cation membrane. The improved methods are more cost-efficient and environmentally friendly than conventional methods.

Methods for the electrolytic decarboxylation of sugars

There are provided methods for preparing lithium hydroxide. For example, such methods can comprise submitting an aqueous composition comprising a lithium compound to an electrolysis under conditions suitable for converting at least a portion of said lithium compound into lithium hydroxide.

Method and electrochemical cells for producing xylo-pent-1,5-diose are provided. The xylo-pent-1,5-diose may be formed in a solution initially comprising D-glucuronic acid or D-glucuronic acid glycoside. The xylo-pent-1,5-diose may be formed by electrochemical oxidative decarboxylation of the D-glucuronic acid or D-glucuronic acid glycoside in the solution in the presence of a graphite foil electrode with improved current efficiency and/or current density.

Methods for the electrolytic production of xylo-pent-1,5-diose

Growing community of inventors

Elma, NY, United States of America

J David Genders