Bag Lifting Centrifuge for High-Purity Fine Chemical Crystal Separation

The Bag Lifting Centrifuge is designed for the batch separation, washing, and dewatering of high-purity fine chemical crystals after crystallization, purification, or solvent recovery.

In fine chemical production, the crystal slurry may contain valuable product crystals, mother liquor, residual solvents, reaction by-products, trace salts, pigments, or soluble impurities. The centrifuge separates the crystals from the liquid phase, supports controlled cake washing, and reduces residual liquid before downstream vacuum drying, milling, screening, packaging, or further purification.

It is suitable for high-purity batch processes where low product hold-up, controlled washing, clean product handling, and reduced cross-contamination are important.

• High-purity crystal separation after recrystallization
• Batch isolation of purified fine chemical crystals
• Crystal cake washing to remove impurity-containing mother liquor
• Dewatering of solvent-crystallized fine chemical products
• Recovery of high-value crystals after reaction purification
• Mother liquor separation for solvent recovery or recycle
• Low-hold-up crystal collection before vacuum drying
• Crystal recovery before milling, screening, or sealed packaging

High-purity fine chemical production requires more than basic solid-liquid separation. The equipment must support product purity, controlled washing, low material retention, and stable batch handling.

Typical process requirements include:

• Low residual mother liquor in the product cake
• Controlled removal of trace salts, color bodies, and soluble impurities
• Reduced solvent carryover before drying
• Low product loss during discharge
• Gentle handling of fragile or irregular crystals
• Easier cleaning between product campaigns
• Lower cross-contamination risk
• Flexible material selection for corrosive or solvent-containing systems
• Optional enclosed or explosion-proof configuration
• Repeatable batch operation for consistent product quality

Process Evaluation

Our engineers evaluate:

• Crystal size and crystal morphology
• Cake-forming behavior and filtration rate
• Slurry solids concentration and mother liquor properties
• Product purity target and wash requirement
• Solvent compatibility and corrosion condition
• Target cake moisture and downstream drying conditions

Equipment Selection

We help customers select:

• Suitable basket diameter and batch capacity
• Filter bag material and micron rating
• Filter screen and feed configuration
• Cake washing and spin-drying arrangement
• Bag lifting discharge system
• Product-contact material and seal configuration
• PLC automation, containment, and explosion-proof options

The prepared fine chemical crystal slurry enters the rotating basket lined with a filter bag and supporting filter screen.

Under centrifugal force:

1. Mother liquor or solvent-rich process liquid passes through the filter bag and is collected through the filtrate outlet.
2. Fine chemical crystals are retained inside the basket.
3. A crystal cake gradually forms on the inner surface of the filter bag.
4. Optional wash liquid is introduced to reduce residual mother liquor, solvents, salts, pigments, or soluble impurities.
5. High-speed rotation removes residual liquid from the crystal cake.
6. The machine stops after the programmed separation cycle is completed.
7. The filter bag containing the dewatered crystal cake is lifted through the top discharge section.
8. The recovered crystals are collected or transferred to downstream drying, milling, screening, packaging, or further purification equipment.

The complete batch cycle can be controlled through PLC operation to maintain stable filtration, repeatable washing performance, and consistent product handling.

For high-purity fine chemical applications, the final configuration should be selected according to solvent composition, corrosion condition, product purity target, cleaning method, and plant safety classification.

To recommend a suitable Bag Lifting Centrifuge, please provide:

• Product name and product purity target
• Crystal size distribution
• Slurry solids concentration
• Mother liquor or solvent composition
• Feed temperature and viscosity
• Batch volume or required capacity
• Target cake moisture
• Cake washing requirement
• Solvent compatibility requirement
• Corrosion condition
• Product-contact material requirement
• Containment or closed-handling requirement
• CIP cleaning requirement
• Explosion-proof requirement, if applicable

Peony welcomes distributor and agent cooperation in fine chemical production, pharmaceutical intermediates, agrochemical intermediates, specialty chemicals, solvent crystallization, and high-purity batch solid-liquid separation projects.

We support partners with centrifuge selection, process advice, filter bag matching, solvent-compatible material configuration, cake washing design, containment options, explosion-proof configuration, spare parts, and after-sales service.

Send us your customer’s product information, crystal size, solvent or mother liquor composition, batch capacity, target moisture, purity target, washing requirement, and safety classification. Our team will help evaluate a suitable Bag Lifting Centrifuge solution.