Cottonseed crude oil: storage, sampling, and refining handoff with hard data

Crude oil specifications

What crude cottonseed oil parameters define refining design

• FFA target post-press: 1-3%. Above 5% (over-cooked or aged seed) requires more caustic in neutralization, raising losses 1-2%.
• Free gossypol post-press: ~0.04%. Bound gossypol 0.5-1.5%. NBD refining must reduce free to <0.045%, mostly via 240-260°C deodorizer.
• Phosphatides 1.5-3%: removed by degumming with phosphoric acid 0.05-0.1% + water hydration. Wet-gum by-product not commercially recovered for cottonseed (unlike soybean lecithin).
• Color Lovibond Y >60 / R 8-15 crude → Y <30 / R <3 refined via 1-2% activated clay bleach at 100-110°C × 20-30 min vacuum.
• Moisture 0.2-0.5% crude. Higher moisture (>0.5%) raises soap formation in neutralization, increases refining loss 1-2%.
• Tank/pipe material: stainless 304/316L for refined; carbon steel acceptable for crude oil holding ≤7 days; longer hold requires stainless to avoid iron pickup darkening.

Future-proofing

How to leave press stage ready for refining integration

• Floor space allowance: 100-200 m² for NBD train at 30-80 t/d (degum + neutralize + bleach + deodorize + utilities).
• Steam: refining adds 1-3 t/h boiler load (deodorizer 240-260°C requires high-pressure or thermal-oil steam at 280-300°C jacket).
• Vacuum: deodorizer requires 2-5 mbar absolute, achieved by steam ejector + barometric condenser or oil-sealed mechanical vacuum pump.
• Crude-oil pump: positive-displacement gear or screw pump, 1-10 m³/h, 304/316L wetted.
• Sampling and lab: free gossypol HPLC, FFA, peroxide, color Lovibond, moisture — daily QC during refining operation.

Project boundary

What to confirm before scoping Cottonseed Crude Oil + Refining | FFA 1-3%, Free Gossypol 0.04%, NBD to <0.045%

Cottonseed Crude Oil + Refining | FFA 1-3%, Free Gossypol 0.04%, NBD to <0.045% 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.

Factory model check

Match hot / cold models to factory hard data

Pin models to published factory specs before tonnage talk.

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).

Equipment check

project scope needs to land in equipment interfaces

Once the route 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.