Crystallisation and precipitation
| Technology | |
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| Technology details | |
| Name: | Crystallisation and precipitation |
| Category: | Pre-processing (Separation technologies), Post-processing (Separation technologies) |
| Feedstock: | Solution with crystallisable ingredients |
| Product: | |
Crystallisation is the formation of crystals from a solution. In a crystal, the atoms or molecules are highly organised into a solid repetitive structure. "A solution is a mixture of two or more species that form a homogenous single phase. Solutions are normally thought of in terms of liquids, however, solutions may include solids suspension. Typically, the term solution has come to mean a liquid solution consisting a solvent, which is a liquid, and a solute, which is a solid, at the conditions of interest. The solution to be ready for crystallization must be supersaturated."[1]
A simple example for crystallisation is the evaporation of the solvent. For example, the salinity of the Great Salt Lake in Utah, USA, is so high that through the evaporation of water salt crystals cover its shores. Some other ways in which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas. Attributes of the resulting crystal depend largely on factors such as temperature, air pressure, and in the case of liquid crystals, time of fluid evaporation.
Feedstock
Origin and composition
The feedstock for crystallisation is a solution with crystallisable ingredients, e.g. minerals or organic molecules. The majority of minerals and organic molecules crystallise easily, and the resulting crystals are generally of good quality, i.e. without visible defects. However, larger biochemical particles, like proteins, are often difficult to crystallise. The ease with which molecules will crystallise strongly depends on the intensity of either atomic forces (in the case of mineral substances), intermolecular forces (organic and biochemical substances) or intramolecular forces (biochemical substances).
Pre-treatment
Process and technologies
Crystallisation occurs in three major steps. The first is nucleation, the appearance of a crystalline phase from either a supercooled liquid or a supersaturated solvent. The second step is known as crystal growth, which is the increase in the size of particles and leads to a crystal state. An important feature of this step is that loose particles form layers at the crystal's surface and lodge themselves into open inconsistencies such as pores, cracks, etc.
Crystallisation is also a chemical solid–liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs. In chemical engineering, crystallisation occurs in a crystalliser. Crystallisation is therefore related to precipitation, although the result is not amorphous or disordered, but a crystal.
Products
Post-treatment
Technology providers
| Company name | Country | Technology subcategory | Technology name | TRL | Capacity [kg/h] | Processable volume [L] | Feedstock: Food waste | Feedstock: Garden & park waste |
|---|---|---|---|---|---|---|---|---|
| Condorchem_Envitech | Spain | - | ENVIDEST MVR FC Forced Circulation | - | 250-2000 | - | ● | ● |
| HUAMO Group | China | - | [Technology name (the "branded name" or the usual naming from company side)] | 9 | 5000-300000 | 4000-8000 | ● | ● |
| TECHNOFORCETM | The Netherlands, India, Germany | - | Plug Flow Crystallisation, Continuous Crystallisation | 9 | - | Continuous | ● | ● |
Condorchem Envitech
| General information | |||
| Company: | Condorchem Envitech | 
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| Country: | Spain | ||
| Contact: | |||
| Webpage: | https://condorchem.com/en/ | ||
| Technology and process details | |||
| Technology name: | ENVIDEST MVR FC Forced Circulation | Technology category: | Pre-processing (Separation technologies), Post-processing (Separation technologies) |
| TRL: | Capacity: | 250 - 2000 L/h per modular unit kg·h-1 | |
| Agitator: | Processable volume: | L | |
| Reactor: | Reactor material: | AISI 316L | |
| Separation type: | (vacuum) Evaporation | Other: | Forced Circulation |
| Feedstock and product details | |||
| Feedstock: | Industrial wastewater and other raw materials from industrial effluents | Product: | Concentrate & Distillate |
Condorchem Envitech is an environmental engineering firm providing water, effluent and air emissions treatment solutions for a wide range of industrial activities. We offer our clients comprehensive environmental project solutions, covering the following services: analysis, planning, design, construction, installation, maintenance and supply of plants and capital goods for waste treatment. Ever since the inception of our company we have promoted the implementation of the best available technologies, so as to ensure our clients are offered the best solutions for their specific needs.
ENVIDEST MVR FC evaporators are a new concept of mechanical vapour recompression forced circulation evaporators. A fast cool start system for preheating the water using electrical resistors, or using steam available.
HUAMO Group
| General information | |||
| Company: | HUAMO Group | 
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| Country: | China | ||
| Contact: | info@huaromembrane.com | ||
| Webpage: | https://www.huamofilter.com/air_flotation_equipment/ | ||
| Technology and process details | |||
| Technology name: | Precipitation type dissolved air flotation | Technology category: | Pre-processing (Separation technologies), Post-processing (Separation technologies) |
| TRL: | 9 | Capacity: | 5.000, 10.000, 20.000, 30.000, 40.000, 50.000, 60.000, 80.000, 100.000, 150.000, 200.000, 250.000, 300.000, can also be designed according to user needs kg·h-1 |
| Agitator: | Processable volume: | 4.000 – 8.000 L | |
| Reactor: | Precipitation type dissolved air flotation equipment | Reactor material: | |
| Separation type: | Precipitation | Other: | Detachable |
| Feedstock and product details | |||
| Feedstock: | Watery mix | Product: | Sludge and liquid phase |
Founded 2007 in Shanghai, HUAMO group has been focused on R&D, manufacturing and marketing of Reverse Osmosis Membrane, Ultrafiltration Membrane, Stainless Steel Filter and other water treatment products. Thanks to its cooperation with US high-tech companies, HUAMO has developed and launched its ultra-low pressure series and brackish water series RO Membranes.
TECHNOFORCETM
| General information | |||
| Company: | TECHNOFORCE | 
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| Country: | The Netherlands, India, Germany | ||
| Contact: | sales@technoforce.net | ||
| Webpage: | https://www.technoforce.net | ||
| Technology and process details | |||
| Technology name: | Plug Flow Crystallisation, Continuous Crystallisation | Technology category: | Pre-processing (Separation technologies), Post-processing (Separation technologies) |
| TRL: | 9 | Capacity: | kg·h-1 |
| Agitator: | Shaft with uniquely arranged blades rotates within a shell | Processable volume: | Continuous L |
| Reactor: | Plug Flow Crystallizer (PFC) | Reactor material: | |
| Separation type: | Crystallisation | Other: | Inside a Plug Flow Crystallizer (PFC), a shaft with uniquely arranged blades rotates within a shell. The product flows through in a nearly plug flow manner under uniform and gentle agitation. Multiple heating/cooling sections provide controlled temperature gradients. Gentle agitation minimizes breakage of crystals. It can have several openings along its length for addition of seeds or anti-solvents. |
| Feedstock and product details | |||
| Feedstock: | Bulk drugs and intermediates, fine chemicals, inorganic and organic salts | Product: | Any application where close crystal size distribution is desired |
Technoforce was started in 1990 to manufacture distillation and drying equipment based on Thin Film Technology. Other technologies like Extraction, Crystallization and Zero Liquid Discharge plants for industrial wastewater were added in later years. About 140 people are working in India and Europe in R&D, pilot plant testing, design and manufacturing.
Through in-house investments and cooperation with universities, Technoforce has developed synergistically relevant technologies. Thus, the customers can avail several process steps from a single source.
Having modern manufacturing facilities with robots and CNC machines in India and pilot plant facilities in India and The Netherlands, Technoforce has uniquely positioned itself to provide competitive solutions. We work very closely with the customers to assist in feasibility studies and tests in the pilot plants for process optimization.
Open access pilot and demo facility providers
Patents
Currently no patents have been identified.
References
- ↑ Sattar Al-Jibbouri "Effects of Additives in Solution Crystallization", 2002, https://sundoc.bibliothek.uni-halle.de/diss-online/02/03H046/prom.pdf