JPS6096679A - Method for solidifying liquid oil - Google Patents

Abstract

PURPOSE:To solidify a liquid oil safely and easily, by adding an emulsifier and silica sol to the liquid oil. CONSTITUTION:5-30pts.wt. emulsifier having an HLB required by oil and 20- 70pts.wt. silica sol having an SiO2 content of 20% or above, an Na2O content of 20% or above and an Na2O content of 5% or below are mixed with 100pts.wt. liquid oil. Examples of the liquid oils are vegetable oil, animal oil such as fish oil, mineral oil and waste oil thereof. The emulsifier is a surfactant capable of emulsifying oils to be treated. It is preferred to use an emulsifier capable of forming a stable emulsion in emulsifying the oils to be treated. Hence, an emulsifier having an HLB required by the oils is chosen. When silica sol has an SiO2 content of less than 20%, the oil can not be completely solidified, while when the Na2O content exceeds 5%, the oil is instantaenously solidified and as a result, a homogeneous solid is hardly formed. Further, an alkali is dissolved out and hands will be roughened thereby.

Description

[Detailed description of the invention] The present invention relates to a method for solidifying liquid oil.

Traditionally, liquid oil, especially waste oil, has been treated in relatively large quantities by being collected by a collection company and then being used as a raw material for soap, etc. It's being used. On the other hand, if it is a relatively small amount of waste oil such as household frying oil, it can be impregnated with absorbent material such as paper, cotton cloth, or sponge-like resin, placed in a plastic bag, and disposed of as general garbage, or disposed of directly into the drain. It is treated by flushing it away and soaking it into the soil. However, these methods are time-consuming, may leak during transportation, clog drains, contaminate the soil, and may spontaneously ignite, so proper disposal methods are required. The method is a good supplement.

The inventor focused on the various disadvantages of the conventional waste oil treatment methods mentioned above, and in order to find a safe and easy way to treat waste oil generated at home, he solidified the waste oil using a water-soluble inorganic substance. As a result of research into a method for emulsifying waste oil, it was discovered that when silica sol is added to waste oil and mixed with a certain type of emulsifier, the whole exhibits a good emulsified state, then increases in viscosity and eventually solidifies. It was 9.

The purpose of the present invention is to solidify liquid oil safely and easily, and the key is to add and mix an emulsifier and silica sol to the liquid oil.

The present invention relates to a method for solidifying liquid oil, which is characterized by adding and mixing an emulsifier and silica sol to liquid oil. This is a method for solidifying liquid oil, which is characterized by adding and mixing 5 to 50 parts by weight of an emulsifier and 20 to 70 parts by weight of a silica sol having a Sin content of 20 inches or more and a Na1O content of 5 inches or less.

The liquid oils to be subjected to the solidification method of the present invention are not particularly limited, and include edible vegetable oils such as cottonseed oil, sesame oil, corn oil, rapeseed oil, and soybean oil, animal oils such as various fish oils, and industrial oils. It does not matter what kind of oil is used, such as lubricating oil, cutting oil, mineral oil such as mold release agent, or their waste oil.

The emulsifier used in the present invention is a surfactant that has the ability to emulsify the oil to be treated. When emulsifying the oil to be treated, the emulsifier that exhibits the most stable emulsion is
B (hydrophyle-11pophileb
It is desirable to select an emulsifier that corresponds to the balance (hydrophilicity/lipophilicity balance). Examples of required HLB are cottonseed oil 7.5, kerosene 12.5, lubricating oil 4, cutting oil 10, mold release agent 13, etc.

The silica sol used in the present invention has a StO content of 20
% or more, and the Na1O content is 5% or less.

Here, the silica sol is obtained by removing or reducing Na ions from water glass, and is produced, for example, as follows. After diluting the water glass with water, it is passed through an ion exchange resin to remove Na ions from the water glass. Chirui water glass is neutralized with sulfuric acid to produce silica gel, which is washed with water to remove Na+ ions and 804''- ions, and heated to peptize the gel.

The silica sols thus produced are further polymerized and concentrated to obtain silica sol.

If the 5iO1 content is less than 20%, the liquid oil will not solidify sufficiently and will only become mushy.If the Na1O content exceeds 596, it will solidify instantaneously, making it difficult to form a homogeneous solidified product. However, it is undesirable that the alkali will elute and make your hands rough.

Examples of silica sols suitable for the purposes of the present invention include Cataloid 5r-ao (sto, 3o%, Nag OO, 4%
), same sr -5oon (SIO!20%, Na10
4%), 5I-80P (St(h 40%, Nato
0.4%) (manufactured by Catalyst Kasei ■), Colloidal Silica PC
-30 (810, 30%, Nan.

0.4 inch), PC-500 (Sly, 21 inch, N
104chi) (manufactured by Nichichi Kagaku ■). Note that even if water glass is used in place of the silica sol, the result is only a mushy state, and the effects of the present invention cannot be obtained.

In the method of the present invention, the amount of emulsifier and silica sol to be used with respect to the liquid oil depends on the desired degree of assimilation of the oil to be treated, but if the oil to be treated is solidified to a so-called grease-like state, 100 parts by weight of the oil to be treated (hereinafter referred to simply as "parts") The emulsifier and silica sol range from 5 to 50 parts and from 20 to 70 parts, respectively. In particular, 15 to 30 parts and 30 parts, respectively, are required to solidify to a konjac-like level and economically.
A range of 60 parts is preferred.

The emulsifier is fi HL B, and if it is 5% or more, it becomes a soluble oil or emulsion that is macroscopically appropriate, but
If sufficient mixing cannot be expected, the emulsifier is preferably 15% or more, and if the emulsifier exceeds 50%, the emulsifier becomes soft and uneconomical. Furthermore, if the silica sol is 20% or more, it solidifies macroscopically, but in order to solidify the whole homogeneously, it is preferably 30% or more, and if it exceeds 70%, it becomes mushy due to the water content.

When an emulsifier with a required HLB that stably emulsifies the oil to be treated is added, the liquid oil is spontaneously emulsified in the form of a stable soluble oil. When a silica sol aqueous solution is added to this soluble oil and stirred,
The whole mixture shows a good emulsification state without separation,
After that, the viscosity gradually increases and eventually solidifies.

Here, it is thought that the solidification effect of the mixture of soluble oil and silica sol aqueous solution is due to electrolyte components such as organic acid esters and alkali metal salts contained in the emulsifier, and the silica sol loses stability and gels. . Therefore, when using an emulsifying agent that does not contain an electrolyte, use an appropriate gelling agent for silica sol, such as phosphoric acid, sodium bicarbonate, acetic acid,
Sodium chloride, ethylene glycol diacetate, etc. may be added.

This gelling agent may be added to the emulsifier in advance, or may be added when the solubilized oil and silica sol are mixed.

In the method of the present invention, the mixing of the oil to be treated with the emulsifier and silica sol is not limited to the method of first adding an emulsifier to the liquid oil to obtain a soluble oil, and then adding silica sol, mixing, and solidifying. do not have. That is, a method may be used in which the emulsifier and silica sol are added to liquid oil at the same time and mixed. Alternatively, a method may be employed in which silica sol to which an emulsifier is added in advance is added to liquid oil and mixed. However, in the latter case, it is necessary to pay attention to the gelation time of the silica sol.

According to the method of the present invention, it is possible to solidify all types of liquid oil, and moreover, the solidification process can be performed in a place where liquid oil exists or where waste oil is generated by a simple operation of mixing.

The solidified product becomes konjac-like, which makes it easy to transport for subsequent collection, reuse, and disposal.
Does not contaminate the surrounding area. Furthermore, since the solidified material contains water evenly, there is almost no risk of spontaneous combustion even if it is left unattended, and even if it ignites, it will self-extinguish.

Therefore, waste oil such as frying oil at home can be recovered and recycled by simply solidifying it, instead of draining it down the drain and clogging drain pipes or contaminating the soil. Easy to use and dispose of.

As described above, the present invention provides a simple method for solidifying liquid oil that has excellent effects in terms of resource reuse, environmental conservation, and safety and health.

Experimental Example 1゜ Waste oil of household tempura oil (soybean oil, required HLB 7-9), Emulgen 404 (manufactured by Kao Soap ■ HLB 8.8) and Cataloid 5s-ao (manufactured by Catalysts Kasei Kogyo ■) were mixed in various proportions. , mixed. Their blending ratios and solidification states are summarized in Table 1.

In the table, the symbol "○" indicates well solidified (konnyaku-like)
, "Δ" indicates a soft substance (grease-like), and "x" indicates a poorly assimilated substance (milk-like).

Table-1 Experimental example 2゜Concrete release agent Resiner Eight (manufactured by Shin-Etsu Sangyo ■)
To solidify 200CC, 40CC each of emulsifiers with various HLB values (manufactured by Kao Soap ■) were added and mixed, and then 80cc each of colloidal silica PC-30 (manufactured by Nichiwa Kagaku ■) were added and mixed.
0CC was added and mixed. The degree of solidification of the products treated in this way is shown in Table 2. Table 2: Emulsifiers using an emulsifier with a value closer to the required HLB13 for the mold release agent will solidify better, and as it moves away from that value, it will become more like a grease or emulsion. It only solidifies.

In addition, Emulgen 409P40 is added to the above mold release agent 200CC.
Add and mix CC to make a soluble oil, add water glass 3
Product number (5lo = 20%, Nap O10%) 80
When CC was added and mixed, the viscosity was somewhat high and it was like a milky lotion.

is J! Hmm Eda Attack Fj-

Claims (1)

[Claims] 5 to 50 parts by weight of an emulsifier corresponding to the required HLB of the oil and 810 parts by weight to 100 parts by weight of liquid oil. A method for solidifying liquid oil, which comprises adding and mixing 20 to 70 parts by weight of silica sol having a content of 20% or more and a nano content of 5 or less.