JPS6035398B2 - Multi-stage oil and fat deodorization method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims at simplifying the equipment and improving the work efficiency by using a new method in a multi-stage oil and fat deodorizing apparatus.

Generally, in the processing of oils and fats, crude oil is first subjected to pretreatment such as deacidification and decolorization, and then refined through a deodorization process.

Various types of deodorizing equipment are used, such as batch type, semi-continuous type, and continuous type, but semi-continuous type is suitable for the oil and fat situation in Japan and is the most commonly used type. ing. Therefore, in the semi-continuous type that has been used conventionally, several inner cylindrical or box-shaped deodorizing trays are installed in a vertical column under reduced pressure, and the crude oil flowing from the measuring tank is placed in each tray. After repeated heating and steam blowing operations are carried out in the chamber, the material is sequentially dropped onto the lower tray, the odoriferous components are gradually removed by volatilization, and the material is cooled in the final cooling tray.
Once it is dropped into a drop tank installed underground, it is discharged into a storage tank at atmospheric pressure by a constantly operating discharge pump. Therefore, these series of steps require a long time, and therefore take an unnecessarily long deodorizing time compared to the product quality standards, causing a decrease in yield, poor work efficiency, and the need for drop tanks. This type of equipment has some disadvantages, such as the fact that it must be installed underground. The present invention solves these drawbacks, eliminates unnecessary equipment, improves work efficiency, and furthermore, by arranging each vacuum tank independently, accidents and
Even in the event of a breakdown, it can be easily dealt with and maintenance can be easily performed.

That is, in the present invention, independent vacuum tanks are arranged vertically, a tray is provided in each vacuum tank, and each vacuum tank is connected by a balance line to control the vacuum in each tank. At the same time, a certain amount of crude oil flowing from the measuring tank is charged into the first tray on the upper stage, and is sequentially transferred into the next tray through the interstage valve provided between each tray. In a multi-stage deodorizing device in which heating and steam blowing operations are repeated in each tray, the filling process from the measuring tank to the first tray is referred to as a branch cycle, and the A pause process is provided in the process of dropping oil into the trays of the tiers at predetermined intervals to form a main cycle, and a process of discharging refined oil from the cooling tray of the final tier is a branch cycle, each of which is operated by an automatic control system. , the above-mentioned suspension process and the process of filling the raw oil from the measuring tank of the branch cycle to the first tray are started simultaneously, and the process of dropping the raw oil from the first tray to the second tray in this main cycle and the cooling of the branch cycle By starting the process of discharging refined oil from the tray at the same time, the time required for the series of processes is shortened, and the refined oil is quickly discharged into the deodorized oil receiving tank via two discharge pumps. This is what I did.

Next, embodiments of the present invention will be described with reference to the drawings. The drawing shows a five-stage oil and fat deodorizing device, with horizontal vacuum tanks 1', 2', and 3.
Trays 1, 2, 3, and 4 are enclosed and arranged in the respective trays ', 4', and 5', and heating steam pipes 6, 7, 8, and 9 are arranged in the first to fourth trays, respectively. Cooling pipes 10 and 10' are installed in the second tray at the final stage. Also, each training. There are interstage valves for oil transfer, 11, 12,
13 and 14 are provided, and the fifth tray at the final stage is provided with two discharge on-off valves 15 and 15' for discharge, and discharge pumps 18 and 18' are respectively attached to quickly deodorize the oil receiving tank 17.
After suction and discharge into the tank, it is discharged into a storage tank. Each of these interstage valves uses a diaphragm type, and the interstage valves are opened and closed by operating air pressure through the respective solenoid valves, and each of these solenoid valves is connected to a respective timer so that the valves can be opened and closed for a predetermined period of time. It is set to be operated every time, and is operated by an automatic control method. In this case, {1} the step of pouring crude oil from the measuring tank 16 into the first tray, and {2} the step of dropping oil from the first tray into the next tray at predetermined intervals. The process, suspension process, and '3) process of discharging refined oil from the final stage cooling tray are set to be performed independently, and the process of charging crude oil from the measuring tank 16 to the first tray and the process of charging crude oil from the source tank Two discharge pumps 15 operate the crude oil charging process into the measuring tank 16 in conjunction with one float valve, and discharge refined oil from the interstage valve of the second tray and the final stage tray (fifth tray). At the same time, the operations of 15' are started, and the second tray, third tray,
The main cycles of the fourth and fifth trays and the pause process are set to operate at predetermined time intervals in reverse order. Thus, in the present invention, each of the timers t5 and t for the second to fourth trays and the fifth cooling tray, which are the main cycles,
4, t3, t2 and the pause timer tl are set to operate in reverse order at predetermined time intervals, and during that time, the first tray M. 1, the interstage valve V and the stop timer tl are started at the same time, and the crude oil is poured from the source tank into the measuring tank 16 via a float valve installed in the measuring tank. Also, the timer 6 of the discharge pump (D.P) that takes out refined oil from the fifth tray (No. 5) and the second tray No. 2
By starting the timer t5 at the same time, the time required for the series of steps can be shortened.

That is, in the present invention, the pause timer tl, the fifth tray, the fourth tray, the third tray,
Each timer t2, t3, t4 for each interstage valve to the second tray
, and t5, and set this operation time as a -cycle process (main.cycle), and set this operation time as a -cycle process (main.cycle). Separately from the cycle, there is a cycle in which the timer t6 of the discharge pump that takes out refined oil from the fifth tray is started simultaneously with the timer t5 of the second tray, and a cycle in which the filling valve V from the measuring tank to the first tray is started at the same time as the timer t1 for stopping. By providing separate cycles that start at the same time, it is possible to simultaneously perform the process of discharging refined oil from the fifth tray during the process of dropping oil from the first tray to the second tray, and also to perform measurement. The main tray is filled from the tank to the first tray by a pause timer. The cycle should be performed separately and simultaneously.

Like this, the main. Drop by combining the cycle and one branch cycle in a predetermined way. There is no need to install a tank, and the time required for discharging refined oil from the fifth tray and filling the measuring tank to the first tray is reduced to the main time. Since it is removed from the cycle process, the time of the work process is shortened, and the deodorizing ability can be improved by about 40%, especially in the deodorizing work of industrial oils and fats. Furthermore, since each vacuum tank in this device is installed individually and independently, even in the event of an accident or failure within the tray, the defect can be immediately discovered and measures can be taken easily. and maintenance work can be carried out easily.

In this device, the provision of a baffle plate above the tray and the arrangement of the drain pipe and booster device are the same as in the conventional device.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show embodiments of the present invention, and FIG. 1 is an explanatory diagram showing an outline of the apparatus, and FIG. 2 is a block diagram showing a working mode. 1, 2, 3, 4...each tray, 1', 2', 3', 4',
5'... Each vacuum tank, 6, 7, 8, 9... Each heating steam pipe, 10, 10'... Cooling pipe,
11, 12, 13, 14...Each stage valve, 15, 15'
... Discharge on/off valve, 16... Measuring tank, 17... Deodorizing oil receiving tank, 18, 8'... Discharge pump, tl...
・Timer for pause, t2...Timer for fifth tray, t3
...Quimmer for the fourth tray, t4...Timer for the third tray, t5...Timer for the second tray, t6...Timer for the discharge pump, D. P...Discharge pump (18), V...Interstage valve, M. T...Measuring tank (16). Figure 1 Figure 2

Claims (1)

[Claims] 1. Several horizontal vacuum tanks each with a tray arranged inside are arranged vertically, and these tanks are connected by a balance line, so that a constant degree of vacuum is always maintained inside each tank, and each tray is In a multi-stage deodorizing device, an inter-stage valve is installed between the stages, and a fixed amount of water is dropped from a measuring tank into the next tray at predetermined intervals, and heating and steam blowing are repeated in each tray. Raw material oil is poured into the first tray on the upper level, and is dropped into the next tray at predetermined intervals through interstage valves installed between each tray, and heating and steam blowing operations are repeated in each tray to deodorize it. The main cycle consists of a series of steps in which refined oil is extracted by a discharge pump after being processed and cooled by being dropped onto a cooling tray in the final stage, and a pause step is provided. The filling process and the process of discharging refined oil from the cooling tray are each operated separately in each branch cycle, and the main cycle is stopped and the branch cycle is filled with raw material oil from the measuring tank into the first tray. At the same time, start this main. The process of dropping the second tray from the first tray during the cycle and the process of discharging refined oil from the cooling tray of the branch cycle are started at the same time, and the time required for one process of these main cycles and the time required for each branch cycle are started simultaneously. This multi-stage oil and fat deodorizing method is characterized by making it possible to significantly shorten the operating time by adjusting the difference between the