CHEMICAL · FUJIAN, CHINA · PROJECT CASE
Two crystal streams.
Two purpose-selected centrifuges.
For its 30,000 t/y pentaerythritol project, Fujian Baihong Chemical selected a HUADA PLD1250 for 95% monopentaerythritol and a HUADA GK1250 for dipentaerythritol recovery and refining.
PROJECT OVERVIEW
One production system. Different separation duties.
Pentaerythritol production combines reaction, neutralization, concentration, crystallization and centrifugal separation. Monopentaerythritol is recovered as the primary crystalline product, while selected mother-liquor streams are processed further to recover higher-value dipentaerythritol.
Although both selected machines have a nominal basket diameter of 1,250 mm, their structures and discharge principles are different. Each centrifuge is assigned to the stream that best matches its filtration, washing and cake-discharge characteristics.
TECHNICAL ROUTE
From condensation to two crystalline products.
Formaldehyde + Acetaldehyde
Controlled alkaline condensation system.
Neutralization & Dealdehyding
Removal of residual aldehydes and volatile components.
Evaporation & Concentration
Preparation of the required crystallization condition.
Primary Controlled Crystallization
Formation of monopentaerythritol crystals.
95% Monopentaerythritol
Primary crystal slurry → PLD1250 filtration → cake washing → dry spinning → scraper discharge → bag-pulling residue removal → drying and screening.
Dipentaerythritol
Selected mother liquor → concentration and recovery → dissolution → decolorization and clarification → recrystallization → GK1250 filtration and peeling → drying and finishing.
Actual temperatures, concentrations, pH values, residence times and washing recipes are governed by the customer’s confirmed process package.
EQUIPMENT CONFIGURATION
Same basket diameter. Different mechanical solutions.
01 / PRIMARY SEPARATION
HUADA PLD1250
For 95% Monopentaerythritol
The vertical PLD1250 performs feeding, centrifugal filtration, cake washing, dry spinning, scraper discharge and residual-cake removal within one programmed batch cycle.
- Feeding Controlled distribution forms a uniform crystal layer.
- Filtration Mother liquor passes through the filter cloth while crystals form a cake.
- Washing Washing liquid displaces retained soluble components.
- Dry Spinning High-speed rotation reduces liquid retained in the cake.
- Scraping The main cake is guided to the bottom-discharge opening.
- Bag Pulling The renewable filter bag releases the layer remaining after scraper discharge.
02 / COPRODUCT RECOVERY
HUADA GK1250
For Dipentaerythritol
The horizontal GK1250 performs automatic filtration, crystal washing, high-speed dewatering, peeling, solids conveying and filter-cloth regeneration.
- Feeding Refined crystal slurry enters the horizontal basket.
- Filtration Dipentaerythritol crystals form a controlled filter cake.
- Washing Retained mother liquor is displaced from the higher-value crystals.
- Dry Spinning Centrifugal force removes additional liquid before discharge.
- Peeling The automatic peeler removes the cake at controlled speed.
- Discharge Wet solids are conveyed to downstream drying and finishing.
SELECTION LOGIC
Why two 1,250 mm centrifuges?
Clean, low-residue primary discharge
Bag pulling removes the residual layer remaining after scraper discharge, helping regenerate the filter medium and reduce material accumulation between batches.
Controlled peeling of refined crystals
The horizontal basket, automatic peeler and solids-conveying system support sufficient washing, repeatable dewatering and stable discharge of dipentaerythritol cake.
Equipment matched to material behavior
The selection connects centrifuge structure with crystal characteristics, mother-liquor displacement, final moisture target and downstream handling.
TECHNICAL REFERENCE
PLD1250 and GK1250 standard data.
| Parameter | PLD1250 | GK1250 |
|---|---|---|
| Arrangement | Vertical | Horizontal |
| Discharge method | Scraper + bag pulling | Automatic peeler |
| Basket diameter | 1,250 mm | 1,250 mm |
| Basket height / length | 700 mm | 600 mm |
| Filtering area | — | 2.45 m² |
| Basket volume | 400 L | 355 L |
| Standard loading capacity | 500 kg | 460 kg |
| Driving motor | 22 kW | 55 kW |
| Maximum basket speed | 1,000 / 1,200 r/min | 1,200 r/min |
| Maximum separation factor | 707 / 1,007 | 1,008 |
| Project duty | 95% monopentaerythritol | Dipentaerythritol |
Values are based on standard HUADA catalogue configurations. Final parameters remain subject to material properties, process conditions and the approved project-specific technical agreement.
ENGINEERING VALUE
A separation system designed around each product stream.
PROJECT GALLERY
Equipment, installation and process details.
PROCESS-SPECIFIC SELECTION
Not one centrifuge for every material.
The Fujian Baihong Chemical project demonstrates why crystalline chemical production can require more than one centrifuge configuration. The PLD1250 addresses controlled washing and low-residue discharge of the primary monopentaerythritol stream.
The GK1250 addresses automatic peeling and controlled handling of the dipentaerythritol stream. Together, the two machines form a complementary separation solution built around product quality, crystallization behavior and downstream handling requirements.
FAQ
Project and equipment questions.
Why is PLD1250 used for monopentaerythritol?
PLD1250 combines filtration, washing, dry spinning, scraper discharge and bag-pulling residual-cake removal. This supports clean automatic discharge and regeneration of the filter medium.
Why is GK1250 used for dipentaerythritol?
GK1250 provides controlled crystal washing, high-speed dewatering, automatic horizontal peeling and stable solids discharge for the refined dipentaerythritol stream.
Do PLD1250 and GK1250 have the same capacity?
No. Although both have a nominal 1,250 mm basket diameter, their geometry, loading capacity, power and discharge principles differ. Actual output depends on slurry and cycle conditions.
Are project-specific results guaranteed?
No project-specific moisture or throughput result is claimed here. Final performance is established from material testing and the confirmed project technical agreement.
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