EXTRACTIONLINE

The oil is extracted on automatic extraction lines. The extraction shop is designed to obtain vegetable oil and meal by extracting it with a solvent followed by stripping.

The extraction method of obtaining vegetable oil is the most economical, provides maximum degreasing of oil and allows to obtain high quality oil and low-fat meal.

The extraction shop consists of the following technological blocks:
  • extraction unit
  • distillation unit
  • meal stripping unit
  • absorption unit
  • external equipment unit
  • "zero" runoff system
  • auxiliary equipment

The raw material of the extraction plant is a prepared cake. Providing the necessary indicators of the cake improves the quality of the finished product and improves the operation of the equipment of the entire technological chain. The following auxiliary materials are used in the technological process: hexane solvent (nephras) and mineral oil. The solvent is used directly in the extractor unit for processing the raw materials entering the shop. Mineral oil is used as an absorbent in the gas purification unit - the absorption unit.
EXAMPLE OF THE LAYOUT SOLUTION OF THE EXTRACTION SHOP
PRINCIPLE OF EXTRACTION LINE OPERATION
1
The raw material enters the extraction shop from the preparation shop with the help of transport equipment and is sent to the extractor through the screw feeder. A magnetic separator is installed between the conveyor and the auger to prevent metal objects from hitting the extractor. In the extractor, the cake falls on the lattice bottom and the conveyor blades move along the extractor.
Countercurrent to the raw material in the extractor is pre-heated in the heat exchanger stream of solvent.
The solvent passes through the layer of raw materials, dissolving the oil and through the lattice bottom enters the lower part of the extractor (placeholder).

2
The extracted material (meal) with the solvent is sent from the extractor to the toaster using a redler. The toaster removes the solvent as well as cools the meal. Removal of the solvent from the meal is by steaming with steam. In the last tub of the toaster, the meal is cooled by air supplied by a blower. Purification of air from solid particles is carried out by a cyclone. Dust-free solvent vapor and water vapor from the top of the toaster are sent to a 1st stage distiller, which heats the stream of concentrated local from the extractor.
3
Obtained in the extractor mestolla, maximally saturated with vegetable oil by means of a pump is sent to the tube space of the distiller of the 1st stage, where it is heated by a stream of solvent vapor and water vapor from the toaster. From the distiller of the 1st degree mestolla flows into the distiller of the 2nd degree. Heating of the place in the distiller of the 2nd stage is carried out by steam. From the 2nd stage distiller, the local is pumped to the 3rd stage of distillation in the 3rd stage distiller.

Solvent vapors from the 2nd stage distiller are combined with the vapor stream from the 1st stage distiller and sent to the condenser of the 1st and 2nd stage of distillation, where they are cooled by the flow of circulating water. In the distiller of the 3rd stage the final distillation of the solvent is carried out by contact of a highly concentrated place with hot steam. The evaporated solvent enters the condenser of the 3rd stage of distillation.
4
The oil from the distiller of the 3rd degree is fed into the buffer tanks of the oil. The gas mixture, which comes from the technological devices to the collecting condenser, is cooled by the flow of circulating water. The condensate of the solvent from the collecting condenser is sent to the water separator, and air and other non-condensed substances are sent to the absorber. In the absorber, the gases are in contact with the mineral oil, the solvent is absorbed, and the purified gases are blown out into the atmosphere by a fan. Mineral oil from the absorber is pumped into heat exchangers, where it is heated by a stream of hot mineral oil and steam.
5
Hot mineral oil is fed to the desorber, in which the solvent is removed from the mineral oil by steaming. Pure mineral oil from the bottom of the desorber is pumped into the absorber, pre-cooled in heat exchangers. Part of the heat of the hot mineral oil is used to heat the mineral oil from the absorber. The residual amount of heat is removed by the flow of circulating water.

Collected in the water separator gasoline condensate is divided into solvent and water. The solvent from the water separator is pumped into the hydrocyclone, then heated to the desired temperature in the heat exchanger with low pressure steam and sent to the extractor. Excess water with traces of solvent gets into the sludge evaporator. The evaporated solvent from the sludge evaporator is sent to the collecting condenser, and water to the evaporator. Evaporation of water enters the steam separator. Then the low pressure steam is sent to the toaster.
SAFETY OF EXTRACTION LINE OPERATION
All used electrical equipment of the shop, including electric lighting, is made in an explosion-proof design. The project envisages measures to minimize the level of hazardous production factors.
The automated control system of the shop includes a system of emergency protection and automation of the following systems:
  • distillation
  • absorption
  • water circulation
  • circulation of the placenta in the extractor
  • circulation of gasoline condensate
  • control of solvent level in underground tanks
  • "zero" runoff system
  • evaporation of the solvent in the toaster

Levels in the devices, local temperature and steam, vacuum depth are measured by safe Krohne level gauges, and Endress + Hauser pressure sensors.
The systems use Camozzi pneumatic equipment, YTC position transmitters, Pepperl + Fuchs level alarms.
Additionally, all pumps are equipped with emergency protection implemented on the basis of vibration sensors Endress + Hauser.

The redler of loading of meal in the toaster is equipped with sensors of rotation on a tension section and on a known asterisk near a reducer. Camozzi sealed gate valves are used to organize safe operating conditions.

Sensors located in the shop have an explosion protection category ATEX Ex ia IIG 5-6TC. Such sensors are connected via Pepperl + Fuchs KFD series spark protection barriers, which meet international requirements in accordance with the ATEX and Namur directives. Control of pneumatic valve solenoids is also implemented through spark barriers that limit the current in the line to 100 mA.

The Siemens controller and discrete and analog I / O modules are used to implement the operation of all process equipment.
The visualization program is based on Siemens WinCC 7.4 software
The program implements the control of all actuators and data trend of all analog quantities.
Starting and regulating equipment of electric motors of direct start of the Lovato company.
The main delivery set also includes a lighting system. Only respective safety transit lamps are applied.
For the implementation of the cable system project, wire trays DKS, power and control cables of leading manufacturers are used.
The scope of delivery also includes: Socomec uninterruptible power supply to provide emergency lighting in the shop.

Extraction takes place under the control of specialized systems that allow you to quickly track possible leaks. In case of unforeseen circumstances, to ensure emergency ventilation, the vegetable oil extraction plant is equipped with a system with safety valves that open if unforeseen circumstances lead to an increase in pressure.