Cottonseed hot press: 110-130°C cook + 80-110°C press, dark crude → NBD refining
Cottonseed hard data: whole-seed oil 18-22%, kernel oil 35-45%, hull 35-45% of seed, linters 5-15%, gossypol 0.4-1.7% (toxic, removed by heat + NBD refining). Hot-press flow: clean → delint (linter saw / acid) → dehull (sheller + aspirator) → cook 110-130°C × 30-60 min (moisture 8-12% → 6-8%) → grind/stir → hydraulic press 200-325 ton at 80-110°C, 100 kg/barrel, 30-45 min cycle → crude oil yield 14-18% whole seed / 28-35% kernel, residual cake oil 6-9% → settle 24 h → refining (degum + neutralize + bleach + deodorize) reduces free gossypol from ~0.04% to <0.045% per FAO/WHO standard.
Cottonseed hot press hard data: cook 110-130°C × 30-60 min (moisture 8-12% → 6-8%) → grind/stir → 200-325 ton hydraulic at 80-110°C → 100 kg/barrel × 30-45 min → yield 14-18% on whole seed / 28-35% on kernel → dark crude oil → refining (NBD) for gossypol reduction.
Cooking spec
Steam-jacketed cooker 110-130°C × 30-60 min, moisture 8-12% → 6-8%, gossypol pigment glands ruptured. Below 110°C: under-cook → low yield. Above 130°C: protein scorching, darker oil.
Grinding and stirring
Roll mill or hammer mill → uniform particle size 1-3 mm → stirring tank for homogeneous moisture/temperature distribution before barrel loading. Prevents pressure pockets in 30-45 min cycle.
Hydraulic press parameters
200-325 ton press, 100 kg/barrel (kernel + hull as feed), cycle 30-45 min at 80-110°C jacket. Yield 14-18% on whole seed, 28-35% on kernel-only feed, residual cake oil 6-9%.
Process diagramCottonseed hot pressing process flow
Delinting → dehulling → cooking 110-130°C × 30-60 min → grinding/stirring → 200-325 ton hydraulic press at 80-110°C, 100 kg/barrel, 30-45 min cycle.
Six-step hot-press flow with parameters
Clean + delint + dehull
Vibrating screen + magnetic separator → linter saw (mechanical) or acid delinter (chemical) → sheller + aspirator (hull 35-45% removed). Output: kernel-rich feed for higher yield.
Cook 110-130°C × 30-60 min
Steam-jacketed cooker, moisture in 8-12% → out 6-8%. Cell membranes rupture, gossypol pigment glands break (improves later refining gossypol reduction).
Grind + stir
Roll mill or hammer mill → 1-3 mm particles → stirring tank ensures uniform moisture/temperature before barrel loading. Critical for batch-cycle uniformity.
Hot press 80-110°C
200-325 ton hydraulic, 100 kg/barrel, 30-45 min cycle. Crude oil dark red/brown (gossypol + chlorophyll pigments). Cake discharged hot, cooled, bagged.
Crude oil and cake handling
- Crude oil: dark red/brown, FFA 1-3%, gossypol ~0.04% free + 0.5-1.5% bound. Settle 24-48 h in jacketed tank → 200-300 mesh plate-frame filter → buffer tank → refining feed.
- Refining (NBD): degum (phosphoric acid 0.05-0.1%) → neutralize (caustic soda) → bleach (activated clay 1-2%) → deodorize (240-260°C × 30-60 min vacuum). Reduces free gossypol to <0.045% per FAO/WHO.
- Cake: 6-9% residual oil + 23-35% protein (with hulls) or 41-44% (decorticated meal). Hot cake discharge → cooler → 25/50 kg bagger or bulk silo for ruminant feed (gossypol-tolerant).
- Hulls: ruminant feed (high fiber), boiler fuel, or particle board feedstock. Hull handling area 50-100 m² for 10-30 t/d line.
- Capex by scale: 10-30 t/d gin-side $80-150k Phase 1; 50-100 t/d mill $300-600k including refining; pilot 1-3 t/d $30-60k.
What to confirm before scoping Cottonseed Hot Press | Cook 110-130°C, Press 80-110°C, Yield 14-18%, Gossypol Reduction
Cottonseed Hot Press | Cook 110-130°C, Press 80-110°C, Yield 14-18%, Gossypol Reduction should not be quoted from an equipment name alone. Check feed lots, target oil, post-press handling, and packing rhythm in one scope before deciding which Cottonseed Oil Press modules stay. Cottonseed is almost always 300/325 hot press + cook + mandatory refining (gossypol).
When feed condition, moisture, impurities, batch weight, and product position are unclear, press tonnage and filter area become guesswork. Factory systems share 60 MPa and 2.2 kW motors; hot pure press is 30–40 min/barrel and cold pure press is ~2 h/barrel — cycle time matters more than brochure tonnage.
- Confirm whether feed is whole seed, kernels, pretreated material, or an existing semi-finished stream.
- Confirm whether the target is crude oil, filtered oil, bottled oil, drum ingredient oil, or a refining handoff.
- Hot cycle reference: pure press 30-40 min/barrel, ~1.5 h for 2 barrels with loading; cold pure press ~2 h/barrel, ~4.5 h for 2 barrels.
- Confirm batch rhythm, labor, changeover, retained samples, power (often 380V/50Hz/3ph), and site install conditions.
Match hot / cold models to factory hard data
When discussing Cottonseed Hot Press | Cook 110-130°C, Press 80-110°C, Yield 14-18%, Gossypol Reduction, pin models to published factory specs — not tonnage alone.
Hot 300/325: 300–325 ton, 60 MPa system, standard barrel Ø390×800 mm / max 100 kg, pure press 30–40 min/barrel, ~1.5 h for 2 barrels with loading, 2.2 kW motor. Cold 355/400/426/480/500: 370–630 ton, integrated frame, same 100 kg standard barrel, pure press ~2 h/barrel, ~4.5 h for 2 barrels with loading; optional Ø300 high-pressure barrel max 60 kg. Residual oil target ~≤5% (peanut hot often 6–8% measured).
- Standard barrel Ø390×800 mm, max ~100 kg crushed feed; optional Ø300 high-pressure barrel max ~60 kg.
- Cylinder material 27SiMn; cold frames are integrated molded steel; hot frames are typically H-type channel steel.
- Cottonseed is almost always 300/325 hot press + cook + mandatory refining (gossypol).
project scope needs to land in equipment interfaces
After Cottonseed Hot Press | Cook 110-130°C, Press 80-110°C, Yield 14-18%, Gossypol Reduction is clear, write the interfaces: how preparation feeds the press, how oil leaves the press, how filtration connects to tanks, and how packing receives finished oil.
Front-end input
Record feed form, daily volume, moisture, and sorting needs so pretreatment is not left to operators.
Crude sampling and refining interface
Gossypol 0.5–2.5% makes alkali + bleach + deodorize mandatory. Leave piping and sample points for refining in the first layout.
Delivery data
Prepare space, power (often 380V/50Hz/3ph), labor, target package, local rules, and acceptance method before quotation.
Clear these up first
Cottonseed contains gossypol (0.4-1.7% in pigment glands), a polyphenolic toxin. Cold pressing leaves intact glands and high free gossypol in oil (~0.1%, far above FAO/WHO limit 0.045%). Hot cooking 110-130°C × 30-60 min ruptures glands, binds part of the gossypol to protein in the cake, and downstream NBD refining removes most of the rest. Cold-pressed cottonseed oil cannot meet edible-oil safety standards without solvent extraction + extensive refining.
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