JPS5835639B2 - Solid fuel manufacturing method - Google Patents

Description

Detailed Description of the Invention The present invention relates to a method for producing solid fuel using cyclodextrin, and mainly utilizes the surfactant effect of cyclodextrin to convert sludge obtained by cleaning the inside of an oil tank into combustible oil. This article relates to a method for producing solid fuel used as a fuel.

The sludge that remains in oil tanks such as oil tanker holds and oil storage tanks after oil is discharged is usually highly viscous and highly resistant to adhesion, making it difficult to remove. The remaining oil was washed away and the odor was removed along with the remaining oil, but this process required a great deal of effort and effort, and the oily water containing sludge obtained in this way was not effective at all. It had no use and was difficult to dispose of.

As a result of intensive research into a simple method for removing this sludge and an effective method for its use, the present inventors found that an aqueous solution of sludge has a surfactant effect, and the sludge adhering to the inner wall of the oil tank can be effectively removed by the surfactant effect. The present invention has been completed by discovering the fact that the sludge is separated from the sludge and further includes the separated sludge.

Therefore, an object of the present invention is to clean the inside of an oil tank using a mixture of a starch decomposition product containing cyclodextrin and water as a cleaning agent, and to further concentrate the cleaning solution by mixing the cleaning solution containing sludge after cleaning. An object of the present invention is to provide a method for producing solid fuel in which dry sludge, which is difficult to process, is turned into powdered fuel.

The sludge as used in the present invention refers to a highly viscous pitch-like oily mixture that remains in an oil tank such as a cargo oil tank or an oil storage tank after the oil in the tank is discharged.

Cyclodex (cyclodextrin) used in the present invention is a special dextrin in which D-glucose molecules are bonded in a ring through α-1,4 bonds. 6~IOA
It has a cavity of.

There are three types of cyclodextrin, α-type, β-type, and r-type, depending on the number of constituent units of D-glucose, and any of them can be used in the present invention.

Of the three types, β-cyclodextrin is a white crystalline powder with the molecular formula (C6HIO0
5) Shown by 7, molecular weight 1135, melting point 300-30
5°C (decomposition).

The starch decomposition product containing cyclodextrin, which is used in place of cyclodextrin in the present invention, can be obtained by various methods. When producing cyclotextrin by reacting with cyclotextrin, the intermediate products obtained can be mentioned.

The manufacturing method will be explained in more detail as follows.

First, the starch solution was adjusted to PHIO, gelatinized homogeneously, and after cooling, Bacillus onsen 13, Bacillus onsen 17-1, Bacillus A, 38-2, Bacillus A135, and Bacillus A169 were prepared. Cyclodextrin glycosyltransferase is a fermentation product of selected microorganisms, has an optimal pH on the alkaline side, and has high temperature stability.
answer) and react.

After heating the reaction solution to inactivate the enzyme, it is cooled and the pH is adjusted to 5.
, adjust to 0.

Commercially available glucamylase is added to this reaction solution to decompose unreacted substances.

Next, the reaction solution is filtered using a conventional method, and the reaction solution is concentrated so that it contains approximately 40% or more of cyclodextrin.A small amount of cyclodextrin is added as a seed to this concentrated solution, and when it is left to stand, cyclodextrin precipitates out. Precipitate.

If this is separated and dried, β-cyclodextrin can be obtained, but the tear fluid at that time is a starch decomposition product that contains the desired cyclodextrin.
2-43897).

The Bacillus A13 bacteria, Bacillus Onsen 17-1, Bacillus A 38-2, Bacillus A135, and Bacillus Onsen 169 have all been deposited with the Institute of Microbial Technology, Agency of Industrial Science and Technology. The microorganism accession numbers for these microorganisms are 611, 612, 614, 617, and 618, respectively.

Furthermore, since the tear fluid is repurified using an ion exchange resin and then concentrated, it is commercially available as a starch syrup containing cyclodextrin, and this starch syrup may be used in the present invention.

Furthermore, the starch decomposition product containing cyclodextrin used in the present invention is not limited to that obtained by the above method, and the starch decomposition product containing each of α, β, and γ cyclodextrins or a mixture thereof. It may be obtained by any method.

EXAMPLES Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples in any way.

Example 1 A suspension of β-cyclodextrin in water obtained by stirring and mixing 25% β-cyclodextrin and 75% water was supplied to an injection type tank cleaning device installed in a tanker, and the tank was cleaned after oil pumping. Ta.

The cleaning liquid containing the sludge thus obtained was dried at 60° C. while stirring under reduced pressure to obtain a powdered fuel using the sludge as a raw material.

Example 2 A suspension obtained by stirring and mixing 50% starch syrup containing cyclodextrin (manufactured by Nihon Shokuhin Kako Co., Ltd., product name: Celltex CH30, cyclodextrin content 15%) and 50% water was placed in a tanker. The oil was supplied to the provided injection type tank cleaning equipment to clean the tank after oil was pumped.

The cleaning liquid containing the sludge thus obtained was dried at 60° C. while stirring under reduced pressure to obtain a powdered fuel using the sludge as a raw material.

Furthermore, in the present invention, any combustible oil other than sludge can be used as a raw material for the solid fuel and emulsion fuel, and when these are used, these combustible oils can be used in place of the sludge-containing cleaning liquid of Examples 1 and 2. A mixture of fuel oil and cyclodextrin or a starch decomposition product containing cyclodextrin may be used.

Combustible oils include petroleum-based liquid fuels such as gasoline, kerosene, light oil, and heavy oil, coal-based liquid fuels such as motor pensol and creosote oil, alcohol-based fuels such as methanol and ethanol, and fatty oils such as fish oil and soybean oil. Any combustible oil that can form clathrates with cyclodextrins can be used.

Next, examples will be shown in which combustible oil other than sludge is used, but the present invention is not limited to these examples at all.

Example 3 Starch syrup containing cyclodextrin in 300 f of white kerosene (manufactured by Nihon Shokuhin Kako Co., Ltd., trade name: Celldex CH-20, cyclodextrin content 15%) 70
0? was added and stirred at room temperature for 3 hours, and then dried at 60° C. with stirring under reduced pressure to obtain a powdered fuel.

Example 4 A powdered fuel was obtained by the same process as described in Example 3, except that β-cyclodextrin was used instead of the cyclodextrin-containing starch syrup used in Example 3.

The powdered fuels obtained in Examples 3 and 4 both had excellent combustibility and did not deteriorate even during long-term storage.

Claims (1)

[Scope of Claims] 1. A method for producing a solid fuel, which comprises drying and powdering a mixture of combustible oil and cyclodextrin or a starch decomposition product containing cyclodextrin. 2. Cleaning the inside of the oil tank using a mixture of combustible oil, cyclodextrin or a starch decomposition product containing cyclodextrin, and water as a cleaning agent. The method for producing solid fuel according to claim 1, which uses a cleaning liquid containing the obtained sludge.