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20121204 NL GUTS presentations Crystallisation

Last updated 597 days ago by Albert Verver

Group of Users of Technology for Separation in the Netherlands




20121204 TUD (Technical University Delft) - Mrs. Anamaria Soare – Optimizing Crystal Growth in an Airlift Crystallizer

The VVVVVV Group of TUD investigates the features of a crystallizer using airlift to reduse the shear stress on crystals normally observed in stirred crystallizers as part of the Task Based design Approach program. Work was executed in a concentrated (NH4)2SO4 solution in water, using laser induced cavitation to generate rather uniform nuclei.

The work indicates that air sparger configuration, gas entrainment, air bubble disengagement, air flow rate and seed load affect the final crystal size and crystal size distribution. It was demonstrated that the airlift crystallizer produces crystals near the ideal crystal size-seed load line. Growth was not limited by diffusion.

Further research is on-going to identify process optima. www.tud.nl


20121204 IOI Loders Croklaan – Mr. Erik Schweitzer: Fractionation of oils and fats

IOI Loders Croklaan is one of the largest processors of palm oil (> 5mio ton/year) In The Netherlands it also processes cocoa butter. Products are used in bakery, non-dairy creamers, ice-cream, confectionary and infant nutrition. IOI LC applies crystallisation to recover different fractions of fats and oils. Using the different melt and crystallisation performances of the fat components and the features of nucleation, growth, agglomeration and attrition IOI LC shows which types of crystalliser are applied for specific separations with examples of stirred crystallisers, static or quiescent crystallisers and scraped surface crystallisers. Several kinds of solvent fractionation and crystallisation including their applicability were highlighted. www.croklaan.com


20121204 TNO - Mr. Albert Jansen –Membrine

From the original Membrane Distillation (MD) process TNO developed two new principle processes: Mempower and Membrine.

In Mempower the pressure of the distillate from MD is increased to about 30 bar with little loss of heat all in the same MD module and this pressure is used to drive a power generator. The advantage is that both electricity and pure water can be produced with waste heat. The proof of principle has been demonstrated.

Membrine combines MD and crystallisation, in which a brine (for instance from RO) is further concentrated by MD and Osmotic Distillation to the extent of high super-saturation of salts. Precipitation of these salts on the membranes is prevented by seeding salt crystals and intermediate cooling. It was demonstrated in the lab, that the brine volume from seawater RO can be reduced from 50% to 1%, increasing water recovery to 99% while different salt fractions can be recovered.

Besides the above two processes TNO showed an example of electrochemical generation of hydrogen peroxide from oxygen dissolved in water. www.tno.nl


20121204 FeyeCon carbon Dioxide Technologies – Mr. Gerard Hofland: Supercritical CO2 in crystallisation

FeyeCon applies supercritical carbondioxide (SCC) to influence the crystallisation process as well as the morphology of crystals. Applying SCC results in high bioavailability of compounds, absence of organic solvents in the product, economic stabilisation of sensitive bio-components and tailored product texture. FeyeCon has experience in steering the morphology by dissolving CO2 in the substrate with subsequent depressurisation, by dissolving materials in SCC followed by depressurisation, micronisation of poorly soluble compounds through dissolving in SCC and spray processing, polymorph manipulation via SCC as anti-solvent, co-crystallisation of poorly and well soluble drugs through SCC, encapsulation of food, drugs and cosmetics and with CO2 as alternative to freeze drying. Examples were given for drugs, medicines, food, proteins, fruit, fibres, fats as food structuring agents. www.feyecon.com


20121204 DSM – Mr. Pieter Vonk – Crystallisation at DSM

DSM applies several crystallization processes in both the Materials and the Life-sciences business: ammonium-sulphate (very large scale), vitamins, carotenoids, sun-care products, API & intermediates for pharmaceuticals, antibiotics and bio-based materials like succinic acid. Crystallisation research deals with process and product support from screening (solubility, nucleation, properties evaluation) to detailed process development (yield estimation, economics), improving DSP (by-product and impurities removal, alternatives comparison) and designing new crystallisation plants in cooperation with third parties like equipment suppliers. Examples in these fields were elucidated.


20121204 DACG (Dutch Association for Crystal Growth) – Mr. Pieter Vonk (DSM), Mr. Joop ter Horst (TUD) – Introduction to DACG

Originally NVKG (Nederlandse Vereniging voor Kristalgroei) the DACG aims to provide a network of and stimulate contact between young & experienced scientists & engineers from university & industry in the interdisciplinary research area of crystal growth. The DACG organizes symposia, annual meetings, Crystal Growth Prize for thesis work and a biannual international large event. Spotlights on the Symposium on Crystal Growth on 8 February 2013 at Purac in Gorinchem The Netherlands. Furthermore 2014 will be The International Year of Crystallography. www.dacg.nl


Join the NL GUTS LinkedIn community through : NL GUTS LinkedIn group
Visit the NL GUTS website www.processinnovation.nl/nlguts
For more information about NL GUTS please contact:
Jan Koning (chairman NL GUTS)
tel +32 473 976 135 - koning@trionpartners.nl
Bart Manders  (contact at RVO)
tel +31(0)88 602 2329 - bart.manders@rvo.nl

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