DTB

22.5m³ DTB Crystallizer Product Overview

The 22.5m³ DTB crystallizer is a large-scale, high-capacity continuous crystallization unit designed for long-term stable operation. Its core advantages include uniform particle size, high purity, and ease of post-processing; large scale + high capacity + continuous and stable operation; low energy consumption, ease of operation, and long service life; broad coverage, strong resistance to interference, and high reliability. It is suitable for demanding crystallization applications in the chemical, food, and pharmaceutical industries.

Core Components

Draft Tube

Equipped with an internal agitator/axial impeller that forces the slurry to flow upward, creating a stable and controllable internal circulation.

Annular Baffle Zone

An annular channel on the outer side of the draft tube where the slurry flows downward, facilitating classification and clarification.

Clarification Zone / Sedimentation Zone

The upper region where fine crystals are discharged via clear liquid overflow, eliminating fine crystals and preventing the product from becoming too fine.

Slurry Zone / Crystallization Chamber

The lower region is a high-concentration slurry zone where crystals grow and are graded.

Heat Exchange System

Typically employs external coolers or heat exchangers for circulating heat exchange; built-in heat exchange coils may also be used.

Vacuum System

Used for evaporation cooling and to control supersaturation.

Key Features

1.Large and uniform crystal size

Stable operation with low supersaturation, reducing secondary nucleation and resulting in a narrow product particle size distribution (uniform CSD).

2.Resistant to wall scaling and scaling buildup

The flow field is well-organized with no areas of severe turbulence, significantly reducing scaling on the vessel walls.

3.Capable of continuous, stable operation

Suitable for large-scale industrial continuous production.

4.Controllable Fine Crystallization

Built-in fine-crystal elimination function effectively controls product particle size.

5.Wide Range of Applicable Systems

Suitable for inorganic salts, organic acids, evaporation crystallization, cooling crystallization, salt recovery, wastewater recycling, and more.

DTB Crystallizer Evaporation Capacity

10m³ DTB Crystallizer, 22.5m³ DTB Crystallizer, 30m³ DTB Crystallizer, 75m³ DTB Crystallizer, 85m³ DTB Crystallizer; OSLO Crystallizer; FC Continuous Crystallizer.

(Designed according to user requirements)

DTB Crystallizer Equipment Materials

SUS304; 316L; titanium alloy; Q235B, etc.

Product-Related Keywords

Wastewater crystallizer; syrup crystallizer; metal salt crystallizer

Product Specification

Crystallizer Type	DTB Crystallizer	FC Continuous Crystallizer	OSLO Crystallizer
Core Circulation Method	Internal slurry circulation	External slurry circulation	External mother liquor circulation
Crystal Growth Zone	Inside the flow guide tube	Within the entire fluidized bed of the cylinder	Upper settling and growth zone of the crystallizer
Fine-Grain Treatment	Settling zone around the baffles + leaching column; fine crystals are eliminated via recirculation	Fine crystals are broken down by circulation pumps, and dissolution occurs naturally due to supersaturation	External fine crystal removal heater; fine crystals are recirculated separately for dissolution
Crystal Grain Size	Medium to large, 0.5–1.5 mm; good uniformity	Medium, 0.3–1.0 mm, with a tendency toward finer particles	Maximum crystal size: 1.0–3.0 mm; most uniform particle size
Nucleation Control	Low agitation, low supersaturation, minimal secondary nucleation	High shear force from circulation pumps leads to frequent secondary nucleation	No pump shear; minimal nucleation; highest crystal purity
Susceptibility to Scarring	External heat exchange surfaces; slurry does not contact heat exchange surfaces, reducing scaling	The slurry flows through the heat exchanger, causing high-speed scouring but prone to scaling and blockage	Only the mother liquor passes through the heat exchanger, resulting in virtually no scaling
Energy Consumption Characteristics	Internal circulation, low-speed agitation, lower energy consumption	High-flow external circulation pump; highest energy consumption	High mother liquor circulation flow rate, moderate energy consumption
Typical Advantages	Simple structure, stable operation, easy maintenance, high overall cost-effectiveness	High circulation volume and processing capacity; suitable for high-viscosity/high-solids-content materials	Largest and purest crystals, best product consistency; the top choice for high-end crystallization
Typical Disadvantages	Upper limit of crystal size is lower than that of the OSLO	Relatively fine grain size, high energy consumption, and high risk of scaling	Complex equipment, high cost, large footprint
Examples of Suitable Materials	Ammonium sulfate, potassium chloride, magnesium sulfate, sodium sulfate, boric acid	Sodium chloride, urea, diammonium phosphate, high-solids-content inorganic salts	Citric acid, lysine, pharmaceutical intermediates, high-end fine chemicals

Product Properties-22.5m³ DTB Crystallizer

Wide Range of Applicable Materials

Suitable for evaporation crystallization, cooling crystallization, and vacuum flash crystallization; ideal for materials with steep solubility curves and a tendency to form scale, such as sodium chloride, nitrates, ammonium sulfate, vitamin C, and monosodium glutamate.

Meets GMP and Cleanroom Requirements

The design features no dead corners, is easy to clean, and provides reliable sealing, making it suitable for clean production environments in the pharmaceutical and food industries.

Significant Economies of Scale

A single unit can meet medium- to large-scale production demands, reducing the number of units, pipelines, and control points, and lowering total investment and O&M costs.

More Stable Circulation and Classification

A large chamber combined with a large flow-guiding cylinder ensures more uniform fluid distribution, superior classification performance, and better consistency in crystal quality.

Compatible with MVR and Multi-Effect Evaporation

Efficiently integrates with MVR and multi-effect evaporation systems to further reduce overall energy consumption, making it suitable for applications such as zero-discharge of high-salt wastewater and salt-nitrate separation.

Typical Applications

Inorganic salts, such as sodium sulfate, sodium chloride, ammonium chloride, ammonium sulfate, and nitrates.
Chemical intermediates and organic acids.
Food additives and sweeteners.
Lithium extraction from salt lakes and salt chemical industry.
Zero-discharge of industrial wastewater and recovery of salts from evaporation and crystallization.

DTB

Company R&D Capabilities

We have a team of over 20 professional R&D personnel spanning multiple fields, including chemistry and engineering.

Team members possess extensive R&D experience; key members have previously worked at Merck & Co. in the U.S. and the Max Planck Society in Germany. They have published more than 40 academic papers in domestic and international journals, hold multiple patents for crystallization technologies, and have led the R&D and design of numerous crystallization units that were the first of their kind in China.

We operate state-of-the-art laboratories and pilot-scale R&D facilities equipped with advanced experimental equipment and instruments, providing robust support for our R&D efforts.

At present, We hold 13 authorized patents and have developed new processes, new equipment, and high-quality products.

Our R&D achievements have been successfully commercialized into multiple production lines, with products sold both domestically and internationally.

Service Process

Collect experimental data: We have our own laboratory, and every sample is carefully tested by experimenters to obtain basic data.

Process development: Based on experimental data and project experience, the technical team will carry out process design and provide you with a targeted solution.

Workshop manufacturing: We have our own research and development workshop, material, warehouse and production workshop, ensuring that your products are produced efficiently and with excellent craftsmanship.

Detail control: Strictly control every production link, focus on product details and ensure product quality.

On-site installation: One stop service from the factory to the on-site installation and commissioning, saving construction time and avoiding affecting normal production and operation.

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