1: Pre-pressing – leaching process
The pre-pressing-extraction process is currently the most secondhand process for the prep work of cottonseed oil. Gossypol is a hazardous phenolic pigment distinct to cottonseed. According to the various cotton selections as well as growing locations, the content of gossypol in cottonseed is 0.15% to 1.8%. In order to decrease the poisoning of gossypol, in the present cottonseed pre-pressing-extraction process, the steaming and also frying of cottonseed mostly use high-moisture steaming. In the very first layer of auxiliary steaming and also frying, the wet dampness of the green body reaches 18%. ~ 22%, due to the big draft of the billet, the phospholipids initially soak up water and also condense in the cake, reducing the possibility of incorporating with complimentary gossypol. Phenol has low poisoning as well as will not affect the feeding value of cottonseed meal. At the same time, it additionally decreases the growing of oil shade and the content of complimentary gossypol in crude oil, thus boosting the top quality of petroleum.
2. Extrusion-extrusion procedure:
Extrusion puffing implies that the material undergoes wet heat treatment in the extrusion puffing device, and then kneaded, extruded, glued, unwinded and also blown, and afterwards cooled and also dried out, to ensure that it ends up being a product with a specific framework. For example, the starch gelatinization and gelation in the raw cotton kernel body, the healthy protein structure creates a permeable as well as strong granular “prepared body”, as well as in the succeeding leaching, the permeability of the solvent and the leaching rate are considerably improved. Furthermore, the thickness of the extruded product is also considerably greater than that of the eco-friendly body, thus boosting the handling capability of the seeping equipment.
3. Liquid-liquid-solid three-phase removal oil manufacturing and dephenolization procedure
In order to keep gossypol in a totally free state, there is no wet warmth treatment in the whole process, which is beneficial to the removal and elimination of gossypol by methanol. The healthy protein material of cottonseed protein powder items can get to greater than 50% (N × 6.25, dry basis), as well as the recurring free gossypol content is less than 0.04%. The total nutrients, digestible energy as well as metabolizable power are more than ordinary cottonseed dish as well as equivalent to soybean dish. Compared to cottonseed basic materials, the conservation rate of lysine and methionine is reasonably high. However, in order to make certain that the residual oil rate in the product is low, leaching tools with a huge handling capacity have to be made use of, consequently increasing the production price; additionally, after leaching with No. 6 solvent, the wet meal is straight gotten rid of with methanol to remove gossypol, which makes it tough to recover the solvent in the leaching remedy, as well as also The loss of the two solvents is increased.