JPS58215489A - Dispersant for slack coal/oil mixed fuel - Google Patents

Abstract

PURPOSE:To provide the titled dispersant containing a dehydration condensate of dimer acid, polyethylene glycol and polyhydric alcohol and exhibiting good storage stability for a long period and excellent fluidity. CONSTITUTION:The dispersant consists of a dehydration condensate obtained by dehydrating 1mol of dimer acid, 0.4-1.6mol of polyethylene glycol with a molecular weight of 100-3000 and 0.05-0.15mol of polyhydric alcohol (e.g. pentaerythritol) at 180-260 deg.C. The dispersant is added in an amount of 0.01-5wt% to a mixed fuel prepared by mixing coal crushed in fine powder which has an average particle diameter of 200 mesh or smaller and shows 70% passage through a 200-mesh sieve, with a high boiling fuel oil (e.g. heavy oil) in the blend ratio of 1:0.3-9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the addition side for producing a pulverized coal-oil mixture that is stable for long-term storage and has excellent flowability.

Although coal is cheap, it is solid and has the disadvantage of being difficult to transport and burn. For this reason, in recent years, it has been possible to overcome these problems by pulverizing it, mixing it with liquid fuel such as petroleum, and burning it.

In order to improve the dispersion stability of solid suspended substances, it is a common practice in the chemical industry to add a surfactant, but it is also true that the effect varies significantly depending on the type of surfactant.

As a result of various studies, the inventors discovered that the It, 7° water condensate of dimer acid, polyethylene glycol, and polyhydric alcohol has an excellent effect on improving the dispersion stability of pulverized coal-oil mixtures. The invention was completed.

In this specification, dimer acid refers to thermal polymerization of unsaturated fatty acids obtained by hydrolyzing drying oils, semi-drying oils, etc. (The main component is a dibasic acid made by polymerizing Kanobakeshi, BP, 3fi, etc.), and in many cases contains small monomers and trimers as impurities. It is an industrial chemical.

Polyethylene glycol is an industrial chemical obtained by addition polymerizing ethylene oxide, and in the present invention, it has a molecular weight ff) of 0 to 300, preferably 400 to 15.
The one with θ0 is used.

As the polyhydric alcohol, compounds having three or more hydroxyl groups in one molecule, such as glycerin, pentaerythritol, dipentaerythritol, sorbitol, polyvinyl alcohol, etc., are used.

The condensate of the present invention is produced by heating a mixture of dimer acid and the above alcohol at a temperature of 180 to 260°C, similar to a general esterification reaction.
Obtained by heating and dehydrating. The mole of polyethylene glycol used per 1 mole of dimer acid is 14 to 1.6 moles, and 0.6 to 1.2 moles of polyethylene glycol. is selected so as not to accelerate the gel properties. For example, in the case of pen query slit, 0.05 to 0.15 mol may be appropriate. However, without using the multi-subalternative al'Iff-rule at all, the effect of fr-IM t&, f) revision is remarkable (, 7, 4 down, right).

Disperse in oil. Various types of coal are used, from charcoal to anthracite. , The one where the 7th stuttering passes 200 mesh fjfi is desirable.

Contains various waste oils, especially fuel oil (heavy oil) at +t% #tt point 1. I'm here.

Mixed alpha II bones of coal and oki! l: 0.3 to 9, preferably 1: 0.7 to 4, and the mixing conditions are not particularly limited.

The amount of dispersant added is 0.01 to 5 weight percent, preferably 0.05 to 1 weight percent, based on the total amount of lime and oil. If more than 5% by weight is used, the dispersibility may be impaired. In addition, if less than 10% water is mixed into the apricot mixture, the dispersibility will be significantly improved.

However, excessive moisture causes heat loss through the evaporation groove M\, so it is desirable to keep the amount below ICy$.

For fractional stabilization of simulated pulverized coal-oil mixed fuel, the additive of the present invention alone can achieve a -3.0% better effect, but other anionic, cationic, or nonionic interfacial agents may also be used in combination. IJI'
It goes without saying that Hl=1.

Next, specific examples of the present invention will be described.

Example 1 After coarsely crushing the 4-hikkaido smoked slightly coking coal lump with a show crusher, it was crushed with a stainless steel keba ball mill to give a 20%
Coal granules with a 0-mesh netting of 75% were made. 250g of this pulverized coal and C heavy oil (JIS K 2
205 Type 3 No. 4) 249.5 g with additives,
1 mole of dimer acid and polyethylene glycol (molecule kt
600 ) 0.75 moles and pentaeris! J7
) 0.1 mol was added at 240°C for 3 hours and dehydrated, and 0.5g of the obtained combination was added, kept at 70°C, and stirred with a homomixer for 10 minutes. ” A mixture sample (A) of Ishi Mume gong and Etunye 1 was obtained.

■Example 2 '14 Mfj tll l and same L ir IJ)-i
V+I: 1iI25f) g and nnl'' 249.2
5 g of dimer acid, 0.1 mol of dimer acid 1 (I), polyethylene glycol (molecules tIl 1000) (1,'l f;
: 6 o'clock: 1" 11 addition ~ Glaze f compound obtained by dehydration 0
．． Heat the 7th batch at 711°C in a homomixer for 10 minutes +VL Jl' L-τ/11. A: r4'y+ Trial, q=g (B) was obtained.

Ratio 4 ~, Example l 'fi Mli, same stone Ai as in Example 1) i & grain 250g
Then, 249.25 g of heavy oil and 17 mol of olein were mixed with about 10 moles of ethylene oxide to form the next product (
1.75g and 1(
) minute lid was pressed to obtain a mixture sample ('0).

The above FTA size ((roll), 0u), (0) has an inner diameter of 5.5
1 from the bottom to a cylinder with a height of 20gg and a take-out nozzle with a cock located 6m and 12w from the bottom.
After filling in the position building of 81 and leaving it for 15 days in a constant temperature bath kept at 70°C,
A sample of F/''l (0 to 6 crn) was taken and the viscosity and coal content (calculated from dry overlay after removing heavy oil tm with benzene) were measured.

Separately, the sample was injected into a measuring cylinder with a content of 100 ml to a position 18 cIn from the bottom. A glass barrel (weighing 20 g) was loosely inserted into the sample, and the insertion time from the time it was shaken to the surface of the sample until it reached the bottom was measured.

Test 1: 籟桔 Song is ``Table 1 and 5?'' It is.

Claims (1)

[Claims] A dispersant for pulverized coal-oil mixed fuel, which contains as an active ingredient a dehydrated condensate of dimer acid, polyethylene glycol, and polyhydric alcohol.