JPH02116375A - Disinfecting method for fermentation raw materials - Google Patents

Abstract

PURPOSE:To prevent sludge from being stuck and precipitated and to effectively execute disinfection with digestion for fermentation raw materials by allowing the fermentation raw materials to flow into the internal part of a porous tube and supplying steam from the external part of the tube. CONSTITUTION:A digesting device is composed of a porous tube 1 and an outer cylindrical tube 2, which surrounds the porous tube 1, and a steam room 3 is provided between the porous tube 1 and outer cylindrical tube 2. The material, hole diameter and shape of the porous tube 1 are not especially limited. However, it is convenient to use the corrosion resistance, for example, stainless-made porous tube, for which the hole diameter is normally 0.5-5mm, preferably 1-3mm. The fermentation raw materials are sent from one side of the porous tube 1 and low pressure steam is sent into the steam room 3. In such a case, steam pressure P<2> in the steam room 3 is set higher to pressure P<1> of the fermentation raw materials in the porous tube 1 and the porous tube 1 is set to a length, which is needed to have a fixed residence time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for sterilizing fermentation raw materials by steaming.

More specifically, the present invention relates to a method for sterilizing fermentation raw materials that prevents the generation and adhesion of sludge such as mud and deposits inside steaming pipes and piping during sterilization by steaming.

[Conventional technology]

Useful substances are produced by fermentation. In this case, a process of heating and sterilizing with steam is usually used to remove bacteria from the fermented raw materials. Blackstrap molasses is used as one of the cheapest raw materials for fermentation.

[Problem that the invention seeks to solve]

When molasses or the like is used as a fermentation raw material, a large amount of sludge is generated during heating and steaming, and it is a big problem that it accumulates in piping, steaming pipes, tanks, etc.

Generated sludge is usually removed by centrifugation or sedimentation, but sludge adheres to and accumulates inside steaming pipes and piping that are heated to high temperatures, and this can cause sterilization contamination, so it must be removed periodically. Forced to disassemble and clean.

(Means for Solving the Problems) In view of the above circumstances, the present inventors have proposed an effective steam sterilization method for fermentation raw materials that prevents the adhesion and deposition of sludge.
If steam is brought into contact with the fermentation raw material through the pores of the porous tube and sterilized, the steam that comes into contact with the fermentation raw material liquid through the pores of the porous tube will condense on the inner surface of the tube and form a water film, or Based on the idea that a thin layer of steam could be formed on the inner surface, and as a result, sludge deposition could be prevented, after extensive research, it was discovered that the desired objective could be achieved, and the present invention was developed. completed.

That is, the present invention is directed to a method for sterilizing fermentation raw materials by steaming, which is characterized by flowing the fermentation raw materials inside a porous tube with a pore diameter of 0.5 to 5 fi, and supplying steam from the outside of the tube.

An example of the apparatus used in the present invention is shown in FIG.

In the figure, the steaming device includes a perforated pipe (1) and a perforated pipe (1).
an outer cylindrical tube (2) surrounding the porous tube (1);
A steam chamber (3) is provided between the outer cylinder pipe (2) and the outer cylinder pipe (2). (4) is a steam inlet, (5) is a steam outlet, and (6) is a pressure regulating valve that is electrically connected to a temperature controller (7).

(8) is a drain trap.

The material, pore diameter, shape, etc. of the porous tube (1) used in the present invention are not particularly limited, but it is usually a cylindrical corrosion-resistant tube with a pore diameter of 0.5 to 5 days, preferably 1 to 3 fi, such as stainless steel. It is convenient to use something. To explain the method of steam sterilization using the above device, a fermentation raw material such as molasses diluted with water (e.g. 30-35% I! concentration) is sent from one side of the perforated pipe (1), and low pressure steam is steamed. Send it into room (3). At this time, the steam pressure (P2) in the steam chamber (3) is set higher than the pressure (Pl) of the fermentation raw material in the porous pipe (1). The perforated tube (1) is set to a length necessary to provide a constant residence time. The perforated pipe (1) can be used for part or all of the steamer 2.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to these.

Example 1 A porous pipe (stainless steel) element (inner diameter 40 m, length 1,00011) with a pore diameter of 3 Wm was used as the inner pipe, and the first
A steaming apparatus with the shape shown in the figure was manufactured.

Cane molasses was diluted with water to set the molasses concentration to approximately 35%, and the liquid, which had been pretreated to remove sludge components using a centrifugal M machine, was supplied into the porous tube at a flow rate of 0.8 rd/Hr.This molasses liquid The pressure (P2) of the steam supplied from the outside of the porous pipe is calculated as follows: 8P=P2-PL・-0,5
Sterilize at ~1.0kg/cdG (approximately 120℃)
I wanted to do it. 120℃ steaming for 48 hours, 10 times cumulative time 48
When measuring the scale (deposits) inside the porous pipe after 0 hours of use, it was found to be less than 0.1fi at the outlet (soft layer formation).
Only some scale deposits were observed, and almost no scale deposits were observed inside the porous tube other than the coloring of the pigment coming from the molasses raw material.

As a control, we conducted a test under similar conditions using a regular stainless steel gas-liquid mixer instead of the perforated tube.
After 168 hours of use, scale deposits of 5 to 711 were observed inside the tube.

Example 2 Philippine blackstrap molasses (I! Concentration: 5 tons) was sent to a steaming tank, diluted to 408BX, and circulated to the steaming tank through the perforated tube heating device shown in Figure 1, and the molasses temperature in the tank was raised from 30°C. The temperature was raised to 951°C over 2 hours.
At this time, the pore diameter of the porous tube was 1 fin, and the temperature of the heating section by the porous tube was 120°C.

Thereafter, the molasses was allowed to remain in the tank at 95°C for 4 hours, and after removing sludge components using a centrifuge, it was supplied to the culture process.

After carrying out this experiment 60 times over a period of approximately one month, the inside of the porous tube was disassembled and inspected, and almost no scale formation was observed.

On the other hand, as a control, heating was performed in a stainless steel double tube, and after repeating the experiment 60 times for about one month, the heating part was inspected.
Scale adhesion of approximately 3111/Iw was observed on the inner wall surface of the tube.

[Action/Effect]

As mentioned above, according to the present invention, when fermentation raw materials such as blackstrap molasses are used, there is no sludge adhesion during steam sterilization, so long-term continuous operation is possible, and since there is no sludge adhesion and sedimentation, There are few abnormalities such as bacterial contamination.

Furthermore, a major feature of the present invention is that noise during sterilization is extremely low. In the case of steam sterilization using a conventional sparger or gas-liquid mixer, the temperature should be set to 120℃.
Steam pressure cuff ~10kg/c+aG to maintain temperature above ℃
However, in the case of the present invention, lower pressure steam (2.5 to 4 kt/cdG) can be used compared to the conventional method. The generation of noise and vibration is extremely low.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of a device used in the present invention. 1... Porous pipe, 2... Outer cylinder pipe 3... Steam chamber, 4... Steam population 5... Steam outlet, 6
...Pressure control valve 7 ...Temperature controller 8 ...Drain trap Patent applicant Kanebuchi Chemical Industry Co., Ltd. Figure 1

Claims (1)

[Claims] 1. A method for steaming and sterilizing fermentation raw materials, characterized by flowing the fermentation raw materials inside a porous tube with a pore diameter of 0.5 to 5 mm, and supplying steam from the outside of the tube.