JPS6348394A - Ash adhesion inhibitor for coal/oil mixture - Google Patents

Abstract

PURPOSE:To provide the title inhibitor capable of inhibiting formation of a grayish white deposit that precipitates in a pipe when a coal/oil mixture is circulated for re-use, which comprises an amine as an active ingredient. CONSTITUTION:A coal/oil mixture having a water content of <=5wt% is compounded with an ash adhesion inhibitor (e.g., triethylamine) which is an amine, pref. having a 2-18C alkyl group, selected from among a prim. amine, a sec. amine, a tert. amine, a nitrogen-contg. heterocyclic compds., an alkanolamine and a quat. ammonium compds., in an amt. of 0.001-2wt%, pref. 0.005-0.5wt% relative to the coal/oil mixture. Moreover, 1pt.wt. dispersant for a coal/oil mixture may be mixed with 0.01-1pt.wt. aforesaid inhibitor, followed by compounding with the coal/oil mixture.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a natural adhesion prevention agent for mixed coal.

Prior Art and Problems Various surfactants have been proposed as conventional dispersion stabilizers for mixed coal and oil phases. The main ones are anionic surfactants such as sodium alkylbenzene sulfonate, dialkyl sulfosuccinate, sodium naphthalene sulfonate formalin condensate, and nonionic surfactants such as ethylene oxide adducts of alkylphenols and ethylene oxide adducts of high-absorbent alcohols. Those containing as the main component are known.

However, conventional dispersion stabilizers are effective for relatively high coal content such as anthracite and bituminous coal, especially coking coal and strongly coking coal, but they are effective against non-coal components such as clay and coal. Coal with a high carbonization content is insufficiently effective and often deposits in mixed coal oil transport piping and combustion equipment, resulting in a decrease in transport efficiency and combustion efficiency.

In the field, such deposits (hereinafter referred to as natural deposits) are mainly composed of viscous substances such as kaolinite rather than coal.
Conventional dispersion stabilizers for blended carbon containing anionic or nonionic surfactants as main components cannot sufficiently suppress deposition.

The present invention can effectively suppress the deposition of the above-mentioned minerals by simply adding it to conventional mixed coal oil. The purpose of the present invention is to provide an ash adhesion prevention agent for Koncharpo.

Means for Solving the Problems The present invention relates to a natural anti-fouling agent for porridge containing ammonia and/or amines as an active ingredient.

The amines that can be used in the present invention include primary amines, secondary amines,
Examples include primary amines, tertiary amines, polyamines, nitrogen-containing heterocyclic compounds, alkanolamines, primary ammonium 2 compounds, and the like. Although the number of carbon atoms is not limited, it is preferably 2 to 18, particularly preferably 4 or more having an alkyl group or an aromatic group.

As the primary amine, a lower amine such as methylamine to a higher amine such as stearylamine may be used, and an amine having a side chain such as diethylhexylamine or an unsaturated bond such as oleylamine may be used. It may also be an aromatic amine such as aniline. - In general, amines with strong amine properties and excellent affinity for mineral oil are preferred, and have 2 to 18 carbon atoms.
, preferably 4 or more aliphatic amines or aromatic amines. Lower amines are highly volatile, and higher amines are highly toxic, especially skin damage, so in order to prevent IL, about 1 to 2 moles of ethylene oxide or propylene oxide may be reacted to make them easier to use.

The secondary amine may be a lower amine such as dimethylamine or a long chain secondary amine such as methylstearylamine in which at least one of the alkyl groups is a long chain. It may also be an aromatic amine such as diphenylamine or an aralkyl amine such as monoethylaniline. The secondary amine is preferably an aliphatic amine or aromatic amine in which at least one of the alkyl groups has about 2 to 18 carbon atoms, and is reacted with about 1 mole of ethylene oxide or propylene oxide to reduce volatility and toxicity. It's okay to be disrespectful.

The same applies to tertiary amines, ranging from lower amines such as trimethylamine to higher amines such as dimethylstearylamine,
Even aralkylamines such as diethylaniline can be used. Preferably, one of the alkyl groups is an aliphatic amine having 2 to 18 carbon atoms or an aromatic amine. A tertiary amine can be converted into a quaternary ammonium salt by reacting ethylene oxide or propylene oxide in the presence of an acid catalyst such as hydrochloric acid. This may be desalted and used.

Examples of polyamines include polyamines such as ethylenediamine, diethylenetriamine, triethylenetetramine, and pentaethylenehexamine, some of which are amidated with fatty acids having a suitable chain length, for example, about 2 to 18 carbon atoms, preferably about 4 to 18 carbon atoms. You can leave it there. However, it is preferred that at least one amino group is in the free state.

It may also be an aromatic amine such as phenylenenoamine.

The alkanolamine may be triethanolamine, jetanolamine, monoethanolamine, triproptoolamine, monoproptoolamine, or the like. Further, it may be an alkylalkanolamine, such as diethylisopropanolamine, or an alkylalkanolamine having a higher alkyl group. Furthermore, aromatic alkanolamines such as jetanolaniline may also be used.

Examples of the nitrogen-containing heterocyclic compound include morpholine, birinone, triazine, pyrrole, pyrrolidine, indole, carbazole, imidazole, oxazole, deazole, and derivatives thereof.

All of the above amino compounds are preferably used in unneutralized or partially neutralized form. The reason for this is not necessarily clear, but the main component of Tenno is a layered viscous substance such as kaolin, and the amino groups, which are basic groups, are captured between the layers, and hydrophobic groups such as alkyl groups and aromatic groups are captured. It is thought that it is oriented on the surface and has an affinity with the mixed coal Uranoura, stabilizing its dispersion.

The ash adhesion prevention agent for mixed coal oil of the present invention is 0.0
0.01-2% by weight, preferably 0.005-0.5% by weight
Use to a certain degree. It can be used by blending it into a mixed coal pond as it is, by blending it into a pool used for producing mixed coal oil, or by blending it into a dispersion stabilizer for mixed coal mixing. Water may not be used, and preferably the water content in the mixed coal oil is 5% by weight or less, more preferably 2% by weight or less.

The dispersant for blending mixed carbon that can be used in combination with the anti-fouling agent of the present invention is not limited, and can be blended with any conventionally known dispersant. Specifically, for example, alkali salts of alkylbenzenesulfonic acids such as dodecylbenzenesulfonic acid, alkali salts of formalin condensates of (alkyl)naphthalenesulfonic acids, alkali salts of higher alcohol sulfuric esters, dioctyl sulfosuccinate, alkylphenols and higher alcohols. Anionic surfactants such as sulfate ester salts of ethylene oxide adducts, ethylene oxide adducts of alkylphenols or their formalin condensates, ethylene oxide adducts of higher alcohols, copolymers of ethylene oxide and propylene oxide, naphthol or formalin condensates thereof nonionic surfactants such as ethylene oxide adducts such as phenylphenol and styrenated phenol, ethylene oxide adducts of sorbitan alkylate,
Examples include various polymer compounds, etc., singly or in mixtures.

Particularly preferred for the present invention are alkylphenols such as butylphenol, nonylphenol, and octylphenol, or ethylene oxide adducts of formalin condensates thereof, or a combination thereof with propylene oxide and a nonionic surfactant with ethylene oxide added thereto. The above nonionic surfactant is added to the alkylphenol in advance.
100 moles of propylene oxide are reacted and further 10 to 2
Particular preference is given to reacting 50 moles of ethylene oxide or simply reacting an alkylphenol with 10 to 200 moles of ethylene oxide.

The blending ratio of the mixed carbon dispersant and the natural adhesion inhibitor of the present invention is 1 part by weight of the former to 0.0 parts by weight of the latter. OI~] 1 part is particularly preferred.

The present invention will be explained below with reference to Examples.

Examples and Saxon Bell charcoal fine powder (200 mesh pass 84%)
49 parts by weight and 50 parts by weight of heavy oil were wet-produced in a mill, and 0.2 parts by weight of a dispersant for mixed coal bending was added to the mixed coal, and 500 parts by weight
Take 9 and homomixer (・1000 r, p, m,)
Mix in medium for 5 minutes using 1. Kuntanpo was prepared.

Dispersant I for kontan oil; Dioctyl sulfosuccinate ■ Dodecylbenzenesulfonate ■; Nonylphenol EO (60 mol) adduct TV:
/-1-ru 7 engineering/-ru PO/EO (10/120) adduct ■ dinonylphenol formalin condensate (degree of condensation 3) P
O/EO (35/100) adduct Where Eo represents ethylene oxide and PO represents propylene oxide.

Furthermore, an amine compound corresponding to the 1O heavy claw type was blended with the above dispersant for mixed carbon bending in place of the above dispersant.
2 parts by weight were added, and a mixed coal II] was produced in the same manner.

The following amine compounds were used.

B. Triethylamine: laurylamine: aniline, triethanolamine, morpholine, nilaurylamine ethylene oxide (2 mol) adduct, amide of lauric acid (1 mol) and ethylenediamine (1 mol): octyl monoethanolamine evaluation The mixed coal oil lQ prepared as above was put into an autoclave, stirred at 110°C, lOkg/ctn' under a nitrogen atmosphere using two stainless steel blades at 700 rpm for 20 hours, the blade was taken out, and stirred with toluene. The amount of ash remaining after washing was measured.

The results are shown in Table-1.

Table 1 Effects of the Invention When the sludge sedimentation prevention agent for mixed coal bending of the present invention is used, it is possible to suppress the generation of gray-white sediments that accumulate in pipes when the mixed coal section is used for circulation.

Claims (1)

[Claims] 1. An ash adhesion inhibitor for mixed coal oil containing amines as an active ingredient. 2. The inhibitor according to item 1, wherein the amine has an alkyl group having 2 to 18 carbon atoms.