Solid-liquid separation equipment for the first-wash stage of CMC and PAC production. SUS316 construction throughout, sealed explosion-proof design for the ethanol wash environment, with filtrate outlet connecting directly to the alcohol recovery system.
After the etherification reaction, the crude CMC or PAC is neutralized and washed with aqueous ethanol to remove by-products — primarily sodium chloride and sodium glycolate — which would otherwise reduce product purity and affect performance. This centrifuge handles the first-wash stage, separating the washed solid product from the ethanol-water wash liquor, which is simultaneously sent to the alcohol recovery distillation system for reuse.
The efficiency of this separation step directly affects the purity of the final product and the economics of solvent recovery. The centrifuge must operate reliably in an ethanol-rich atmosphere, making the sealed, explosion-proof design essential for both product quality and operational safety.
Type selection depends on your target production capacity, batch size, and process design. ZHAOYUAN's reference first-wash installation uses the horizontal continuous type. Contact us with your requirements for a recommendation.
| Parameter | Operating Condition | Design Condition |
|---|---|---|
| Medium | CMC, ethanol | |
| Temperature | Ambient | 65°C |
| Pressure | Atmospheric | 0.09 MPa.G |
| Parameter | Specification |
|---|---|
| Product-Contact Material | 316 stainless steel |
| Overall Dimensions | 4500 × 1100 × 1400 mm |
| Drive Power | 30 kW (main bowl drive) / 7.5 kW (differential/scroll drive) |
| Single Unit Weight | 3,550 kg |
| Operating Environment | Explosion-proof sealed — suitable for ethanol atmospheres |
| Wash Medium | Aqueous ethanol wash liquor from the first-wash stage |
| Capacity | Custom — sized to production line throughput |
Specifications above are from a completed reference project. Equipment is sized to your production capacity and process conditions — contact us for a tailored proposal.
After etherification, the crude CMC or PAC slurry contains reaction by-products — mainly sodium chloride and sodium glycolate — dissolved in the ethanol-water wash liquor. The centrifuge performs solid-liquid separation, spinning out the wet CMC/PAC cake from the liquid stream. The separated liquor is sent to the alcohol distillation column for ethanol recovery and reuse, while the washed solid cake proceeds to drying.
Horizontal decanter-type centrifuges use a twin-drive configuration: a main motor rotates the outer bowl at high speed to generate centrifugal force for separation, while a smaller differential (scroll) motor drives the internal screw conveyor at a slightly different speed to continuously convey the separated solids toward the discharge end. This is why the drive power is listed as two values (30 kW main / 7.5 kW differential) — it is standard for continuous horizontal decanter centrifuges rather than a fault or duplication.
CMC and PAC washing is typically carried out in multiple stages to progressively reduce salt content (sodium chloride and sodium glycolate) to the target product specification. The first-wash centrifuge handles the initial, highest-concentration separation immediately after etherification, before the product moves on to subsequent wash and separation stages. Multi-stage washing balances product purity against ethanol consumption and wastewater volume.
The first-wash liquor contains dissolved sodium chloride and residual acid from the neutralization step. Chloride ions are aggressive toward standard 304 stainless steel, causing pitting corrosion over time. 316 stainless steel contains molybdenum, which significantly improves resistance to chloride-induced pitting and crevice corrosion — making it the appropriate material choice for equipment in direct contact with the chloride-rich wash stream.
The first-wash liquor normally runs at ambient temperature under atmospheric pressure. The equipment is nonetheless designed and pressure-tested to withstand 65°C and 0.09 MPa.G — providing a safety margin above normal operating conditions to accommodate process upsets, warm wash liquor recycled from upstream stages, or seasonal ambient temperature variation, without derating the equipment.
Yes. The specifications on this page reflect a completed reference project. Centrifuge type (horizontal decanter or vertical basket), bowl size, drive power, and throughput are engineered to match your target annual production capacity, wash liquor concentration, and downstream alcohol recovery system design. Contact ZHAOYUAN with your target capacity for a tailored equipment specification.