Cottonseed oil is oil squeezed from cottonseed. It is divided into pressed cottonseed oil and extracted cottonseed oil. The color is darker red than other oils. Only refined cottonseed oil can be consumed by humans.(Related Post: Cottonseed Oil Press Machine and Oil Refinery Plant >>)

Cottonseed Oil Production Process

Cleaning: Remove organic impurities (stems, leaves, shells, ropes, etc.), inorganic impurities (dust, silt, pebbles, metals), and oily impurities (worm particles, residual particles, heterogeneous seeds, etc.). In this section we use magnetic separator, vibrating screen, destoner, and peeling machine (hammer peeling machine for cotton seeds). By removing impurities, oil loss can be reduced, oil yield and the environment of the production plant improved. The impurity content in materials produced after pretreatment is ≤0.1%.

Crushing: Adopting the toothed cracking roller to make the cotton seeds kernel into a right uniform pcs which can keep a moderate block size for squeezing out the oil.

Flaking: Process the crushed cottonseed kernels into uniform small pieces with a thickness of ≤0.5mm, less powder, and no oil spillage. Gently pinch it with your hands. The proportion of powder smaller than a 1mm mesh is ≤10% – -15%.

Cooking: The process is to add the steam into the crushed/flaked seeds pcs, then to dry the seeds for getting rid off more water content. In this process, changing the protein of seeds with the water and temperature to make the oil moleculeo loose for pressing easily to get crude oil also get the better cake and oil. We adopt vertical stack cooker with five layers to cook flakes. Loading full in the 1-2 layers, played the purpose of steaming flakes, and then the temperature reached 95 – 100 degrees, In 3-5 layers should loaded to shallow, controlled about 40% which could get rid of water from flakes. The pressure of jacket steam is ≤ 0.6MPa. The temperature and water rate of flakes after cooking is:Water Content: 12–14 %; Temperature: 95–100 degrees; Requiring Time: 60mins.

Pressing: Matching the modern style oil press machines to get more oil, or you can use solvent after pre-pressing by oil press to get more oil. Solvent extraction is the commonly used commercial technique to recover oil from oilseeds.

Refining: Crude oil contains residues and solid powders, so these must be removed before packaging or refining. The residue and solid powder are separated by an automatic oil residue separator. After separation, two products can be obtained. One is crude oil with 1% impurity, which is further refined or filtered by a filter press; the other is an oily residue, which is transported back to the screw press for compression to obtain the remaining oil.

Technical features

1. The project uses cottonseed meal (protein content 46%) as raw material, separates cottonseed hulls and lint from cottonseed through a pretreatment workshop, and produces cottonseed meal by-products with high protein content.

2. The pressing efficiency and stability of oil press equipment are the key to the oil pressing process. Our oil press has high output, low cake residue and good cake quality.

3. The protein content of cotton meal reaches 57%. Cottonseed meal (protein content 57%) enters the solvent extraction workshop. The gossypol and raffinose components in the cottonseed meal are extracted by a low-concentration methanol solution in the extraction machine to produce concentrated cottonseed protein products and crude raffinose products.

4. Advanced physical refining technology reduces refining losses and improves oil quality. The by-product, fatty acids, can be obtained directly, helping the factory achieve sustainable economic benefits. There is no wastewater pollution during the process, and it meets environmental protection and health requirements.

Cottonseed cake solvent extraction workshop of cottonseed oil mill plant

Cottonseed oil extraction production line get crude extraction oil from cottonseed cake through processing flows of solvent extracting, mixture oil filtration, wet bran treatment of dephenolizaiton and mechanical desolvent, and low temperature drying, evaporation, gas stripper to obtain crude cottonseed oil. After the peanut oil solvent extraction process, there is only less 1% oil content in meal.

The cottonseed oil press equipment designed by our company adopts advanced process design, with easy installation of equipment, safe characteristic and automation, small energy consumption, good effect of extraction, low residual oil in meal, and good quality of meal and oil.