Top Discharge Centrifuge for Small-Batch Solvent Crystal Recovery

The Top Discharge Centrifuge is designed for batch filtration, crystal washing, and solvent removal in small-batch crystal recovery processes.

It is suitable for crystallized products produced from solvent-based reaction, extraction, purification, or recrystallization steps. The feed slurry may contain product crystals, solvent, mother liquor, soluble impurities, and fine crystal fractions. The centrifuge retains filterable crystals inside the rotating basket while solvent and mother liquor pass through the filter medium and are collected separately.

For small-batch solvent crystal recovery, the main requirements are usually not only cake moisture reduction. The equipment must also support controlled feeding, stable cake formation, optional solvent displacement or washing, reduced residual liquid, and safe product collection after the batch cycle.

• Small-batch solvent crystal recovery
• Product isolation after solvent crystallization
• Recrystallization product recovery
• Fine chemical intermediate separation
• Specialty chemical crystal washing and dewatering
• Organic acid crystal recovery from solvent systems
• Dye intermediate crystal filtration
• Chemical additive and specialty salt recovery
• Small-lot catalyst-free reaction crystal separation
• Solvent displacement before vacuum drying
• Crystal cake washing before final drying
• Multi-product batch separation with frequent cleaning
• Laboratory, pilot-scale, and small commercial production batches
• Solvent-based product recovery before screening or packaging

Peony provides the batch solid-liquid separation section between the upstream crystallization vessel and downstream drying, screening, storage, or packaging equipment.

Crystallizer / Reactor → Slurry Holding Tank → Controlled Feed → Top Discharge Centrifuge → Solvent or Mother Liquor Collection → Optional Cake Washing → Spin Drying → Top Opening → Crystal Cake Discharge → Dryer / Screen / Packaging

Peony can provide:

• Top discharge centrifuge selected according to batch volume and crystal condition
• Filter cloth or filter screen selection based on crystal size and filtrate clarity
• Controlled slurry feeding arrangement for stable cake formation
• Optional solvent displacement or cake washing system
• Filtrate collection, solvent recovery, recycle, or treatment connection
• Crystal collection bin, hopper, trolley, or sealed receiver interface
• Corrosion-compatible product-contact material selection
• Explosion-proof motor and electrical configuration, as required
• Nitrogen blanketing or inerting connection, as required
• PLC-controlled batch operation with safety interlocks

1. Crystal Slurry Feeding

Crystal slurry enters the rotating basket through a controlled feed system. The feed rate is adjusted to support even basket loading and avoid disturbing the developing cake.

2. Solvent and Mother Liquor Filtration

Solvent, mother liquor, or process liquid passes through the filter medium and basket perforations before leaving through the filtrate outlet.

3. Crystal Retention

The product crystals remain inside the basket while the liquid phase is discharged.

4. Filter Cake Formation

As feeding continues, the retained crystals gradually form a stable filter cake on the inner basket wall.

5. Optional Cake Washing or Solvent Displacement

Compatible wash liquid can be introduced to reduce residual mother liquor, soluble impurities, color-bearing liquor, or unwanted solvent retained between the crystals.

6. Spin Drying

The basket continues rotating to reduce free solvent or liquid retained in the crystal cake.

7. Machine Stop and Top Opening

After the programmed separation cycle is complete, the centrifuge stops and the top cover is opened.

8. Top Crystal Cake Discharge

The dewatered crystal cake is removed manually through the top opening and transferred to a collection bin, sealed container, vacuum dryer, tray dryer, screen, storage bin, or packaging process.

Flexible Small-Batch Operation

The centrifuge is suitable for applications where batch quantity, product type, crystal condition, or production schedule changes frequently.

Controlled Solvent Removal

Filtration followed by spin drying helps reduce free solvent and mother liquor retained in the crystal cake before downstream drying or packaging.

Optional Cake Washing

A controlled wash step can reduce residual impurities or mother liquor before final spin drying. Wash solvent type and volume can be selected to balance purity improvement and product recovery.

Filter Media Matched to Crystal Size

Filter cloth, screen type, and micron rating can be selected according to crystal size distribution, fines content, filtration rate, and allowable product loss.

Easy Inspection and Cleaning

The top-opening design provides direct access for cake inspection, filter media replacement, basket cleaning, and batch changeover.

Please provide:

• Product name
• Crystal size range and fines content
• Batch volume or required daily production capacity
• Slurry solids concentration
• Solvent type and mother liquor composition
• Solvent flash point or plant safety classification, if available
• Feed temperature and slurry viscosity
• Required filtrate clarity
• Target cake moisture or residual solvent target
• Cake washing or solvent displacement requirement
• Product solubility in the selected wash solvent
• Corrosion condition
• Required product-contact material
• Explosion-proof or inerting requirement
• Cleaning requirement and batch changeover frequency
• Downstream dryer, screen, storage, or packaging arrangement

Is a Top Discharge Centrifuge suitable for small-batch solvent crystal recovery?

Yes, provided the product crystals can form a stable and filterable cake. It is suitable for flexible batch production where controlled washing, solvent removal, and manual cake collection are acceptable.

Can the crystal cake be washed inside the centrifuge?

Yes. An optional wash system can be used to reduce residual mother liquor, soluble impurities, or unwanted solvent. The wash liquid and wash volume should be selected carefully to limit product dissolution.

Can the filtrate be collected for solvent recovery?

Yes. The filtrate can be routed to a solvent collection tank, recovery system, recycle loop, or treatment section according to the process design.

Is explosion-proof configuration available?

Yes. Explosion-proof motors and electrical components can be provided when required by the solvent, hazardous-area classification, and plant safety standard.

Can nitrogen blanketing be provided?

A nitrogen blanketing or purge connection can be configured when required. Final design should be based on solvent properties, oxygen sensitivity, vapor-control requirements, and the plant safety assessment.

Peony welcomes distributor and agent cooperation with fine chemical manufacturers, solvent recovery contractors, crystallization system suppliers, specialty chemical producers, chemical engineering companies, and industrial separation partners.

We support centrifuge selection, filter media matching, cake washing design, solvent handling connection, corrosion-resistant material selection, explosion-proof configuration, installation guidance, commissioning support, spare parts, and technical service.

Send us your product name, crystal size, slurry solids concentration, solvent information, batch capacity, target residual solvent, washing requirement, safety classification, and downstream handling arrangement.