Galactic S.a.

Brussels Biotech

Futerro S.a.

Jean-Christophe Bogaert

Philippe Coszach

Jonathan Willocq

Pierre-Antoine Mariage

Angelo Chianese

Aurélie Bernard

Frederic Van Gansberghe

Fr&eacute;d&eacute;ric Van Gansberghe

Patricia Di Salvatore

Frederic Van Gansbeghe

Etienne Malhaize

Maria-Paola Parisi

Martin Van Gansberghe

Florence Wolff

Delphine Hottois

Alexandre Bruneau

The present invention concerns a method for purifying an aqueous lactic acid solution, obtained from a fermentation medium or from any other source previously cleared of solid substances and/or of biomass that may be present and ionic substances, characterised in that it comprises the two following steps: a. Concentration of the lactic acid solution until a concentration of between 85 and 95% is reached, preferably of between 90 and 95%, i.e. between 15 and 5% free water or preferably between 10 and 5% free water; b. Distillation in a multi-stage column comprising three areas and allowing the separation, in a single step, of the lactic acid, volatile compounds and the heaviest impurities.

Method for purifying an aqueous lactic acid solution

The present invention relates to an industrial process for producing a lactic ester containing in total at least seven carbon atoms, from a fermentation liquor containing ammonium lactate in order to avoid the inherent production of gypsum, with a high yield and according to which the loss of lactic ester in the form of lactamide is limited as much as possible.

Method for producing a lactic ester from a fermentation juice containing ammonium lactate

A process for recycling a polymer blend necessarily containing PLA, comprising grinding, compacting, dissolving in a solvent of PLA, removing the undissolved contamining polymers, alcoholysis depolymerisation reaction and purification steps.

Chemical recycling of PLA by alcoholysis

Method for purifying lactic acid by crystallization in one or a plurality of steps, characterized in that crystals are formed from an impure aqueous lactic acid solution having a color of &#x3e;500 Hazen, at a concentration between 85 and 95% by controlling the lactic acid oligomer content expressed in terms of a relative monomer content greater than 80% and controlling the degree of supersaturation of the solution between 1 and 60% in order to obtain lactic acid crystals having a specific surface area by mass of &#x3c;0.05 m/g.

Method of purifying lactic acid by crystallization

A process for recycling a polymer blend necessarily containing PLA, comprising grinding, compacting, dissolving in a solvent of PLA, removing the undissolved contaminating polymers, hydroloysis depolymerization reaction and purification steps.

Chemical recycling of PLA by hydrolysis

A process for the production of polylactide, the stages of which for the production and purification of lactide, starting from an aqueous solution of lactic acid or of its derivatives, includes evaporation of water with formation of oligomers, depolymerization to give lactide, condensation and then crystallization of the crude lactide product to give purified lactide, aqueous treatment of the residual fractions from the crystallization and polymerization of purified and/or prepurified lactide to give polylactide in an extruder and in the presence of catalysts. An alternative process includes carrying out the aqueous treatment before the crystallization.

Method for the production of polyactide from a solution of lactic acid or one of the derivatives thereof

The invention concerns a method for purifying the dimeric cyclic esters of lactic (or glycolic) acid starting from a raw lactide (or glycolide) comprising impurities, the method consisting in: extractive and controlled crystallization of the raw lactide, in aqueous medium, controlling the geometry of the formed crystals and carrying out a separation of phases into lactide and impurities; separation of the resulting suspension of crystals, into a phase poor in lactide and loaded with impurities, and a wet cake rich in lactide crystals; drying the resulting wet cake; and recrystallization in melted medium of the resulting dried impure lactide and recuperating the purified lactide.

Method for purifying cyclic esters

The invention concerns a method for recuperating and purifying a lactic acid solution obtained initially from a fermentation medium or any other source, consisting in a pre-treatment to eliminate the ion loads capable of catalysing the lactic acid condensation and based on the principle of ion exchange or any other related principle, followed by at least a step of concentration at low temperature and brief retention time and at least a step of distilling the lactic acid using a thin layer process.

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Escanaffles, Belgium

Jean-Christophe Bogaert