DD292145A5 - NON-LONG NETWORK FOR HEAVY DUTY STUDS - Google Patents

Abstract

Wetting agent for schwernetzbare dust, such. As coal dust, which in addition to an alkylene oxide adduct of the formula {wetting agent, coal dust; schwernetzbare dusts; Alkylene oxide adduct; phthalic acid; phthalates; Calcium chloride solution}

Description

(IV) CO- (C ₃ H _{6 O} ) _n - (C _A 0) _p -H

wherein (m + n) is a number from 1 to 10 and (o + p) is a number from 1 to 10,

C) 1% to 8%, based on the weight of the nonionic wetting agent, of an alkylene oxide adduct of the formula V

HO- (C ₂ H ₄ O) C- (C ₃ H ₆ GV (C ₂ H ₄ O) SH (V)

wherein r is a number from 0 to 5 and (q + s) is a number from 1 to 4,

D) 0.5% to 2.5%, based on the weight of the nonionic surfactant, of a dialkyl ether of the formula VI

R-O-R (VI)

wherein R is an alkyl radical of chain length C ₇ , C ₈ or C ₉ ,

E) 0.5% to 5%, based on the weight of the nonionic wetting agent, of an alcohol of the formula VII

R-OH (VII)

wherein R is an alkyl radical of chain length C ₇ , C ₈ or C ₀ and

F) 2.5 to 5%, based on the weight of the nonionic wetting agent, of an acid of the formula VIII

consists,

2. Non-ionic wetting agent according to claim 1, characterized in that as components A ₁ D and E, such compounds are preferred in which R is a 2-ethylhexyl radical.

3. Nonionic wetting agent according to claim 1, characterized in that as component A such alkylene oxide adducts are preferred in which χ is a number from 2.5 to 3.5 and y is a number from 2 to 3.

Field of application of the invention

The invention relates to a nonionic wetting agent for attenuable dusts, such. As coal dust.

Characteristic of the known state of the art

It is known (M.SCHICK, "Nonionic Surfactants", Marcol Decker Inc., New York 1967) that adducts of oxypropylene and oxyethylene to compounds having at least one active hydrogen atom are wetting agents DE-PS 2448388 describes microorganism-degradable surfactants of the general type Formula I:

RO- (CH ₂ CHO) X- (CH ₂ CH ₂ CVH (I)

R '

in which R is a straight-chain alkyl rust having an average carbon number of about 6 to 10, R 'is a straight-chain alkyl radical having 1 to 6 carbon atoms, χ is a number from about 1 to β and y is a number from about 4 to 15. In DE-PS 3431156 biodegradable detergent and detergent composition of the formula II:

RO- (CH ₂ CHO) .- (CH ₂ CH ₂ O) _b -H (H)

CH ₃

wherein R is a linear or substantially linear alkyl group of 6-10 carbon atoms, a has an average of 4.5 to 9, and b has an average of 2 to 9.

Nonionic surfactants, which have a chemical structure according to formula I or II, are good wetting agents for detergent formulations, but have the disadvantage that they nebulize coal dust completely insufficient (Netzze'.cn greater

The DD-PS 250541 describes a little dust-forming particulate composition, according to which dyes are stabilized with ethoxylated ethoxylation 3-20 against dust formation with ethoxylation, these products are also hardly effective for wetting schwernetzbarer dusts (network times greater than 30 min).

Processes for the preparation of dust-binding agents and pastes, or dust-binding agents and pastes, which are particularly adapted for binding pulverized coal, are described in DE-PS 1492 297.1492458.2114927.3 300848 and in US-PS 3928222, 3954662 and 4067818 discloses. The patents describe more or less alkaline earth alkaline earth hydroxide / alkaline earth chloride mixtures with partial additions to a variety of wetting agents, such. Nonylphenolpoly (oxyethylene) adducts, alkylpoly (oxyethylene) ethers having alkyl chain lengths between C ₇ to C ₃₀ and dialkylsulfosuccinates. The coal dust binding capacity of these agents and pastes is emphasized, but nothing has been made known about the wetting action in relation to hardly wettable dusts. An improvement of the wetting effect of conventional wetting agents should be achieved according to DE-PS 2702186 by combining ethoxylated nitrogen bases with hydrotropes, such as alkyl oxylensulfonsäuren. The disadvantage is that these combinations are effective only at salt concentrations between 500 to 5000ppm.

US Pat. No. 4,425,252 describes a wetting agent based on a nonylphenolpoly (oxyalkylene) adduct having a degree of ethoxylation of 10, the sodium salt of dodecylbenzenesulfonic acid, isopropanol, diethylene glycol monobutyl ether and water. The achieved net times for 50mg coal dust are given for an optimal recipe with 3,9min, whereby the wetting agent in d ° st. Water with 440ppm Ca ²⁺ addition was dissolved. For this small amount of coal dust, the net time reached is too long and the hard water compatibility with 440 ppm unsatisfactory.

Object of the invention

The aim of the invention is to reduce the cost of materials for the binding of crosslinkable dusts in water and salt solutions.

Explanation of the essence of the invention

It is an object of the present invention to develop a non-ionic wetting agent for crosslinkable dusts, such as carbon dusts, which is effective even in the presence of saline solutions, low foaming and allows sinking times below 400s when 0.6 to 0.9% wetting agent solutions are used in FIG 35% salt solutions are used. According to the invention, the object is achieved by a non-ionic wetting agent, consisting essentially of

A) 77% to 95% (based on the weight of the nonionic wetting agent) of an alkylene oxide adduct of the formula III

RO- (C ₃ H ₆ O) _x - (C ₂ H ₄ O) _y , -H (III)

wherein R is an alkyl radical of chain length C ₇ , C ₈ or C ₉ , χ is a number from 1 to 4 and y is a number from 1.5 to 5.

B) 0.5% to 2.5% (based on the weight of the nonionic wetting agent) of an alkylene oxide adduct of the formula IV

JU

JU- (CH 0) _m - (C ₂ H _{4 O} ) _o -H

wherein (m + n) is a number from 1 to 10 and (o + p) is a number from 1 to 10,

C) 1% to 8% (based on the weight of the nonionic wetting agent) of an alkylene oxide adduct of the formula V

HO- (C ₂ H ₄ O) _q - (C ₃ H ₆ O) r (C ₂ H ₄ b), - H (V)

wherein r is a number from 0 to 5 and (q + s) is a number from 1 to 4,

D) 0.5% to 2.5% (based on the weight of the nonionic wetting agent) of a dialkyl ether of the formula Vl

R-O-R (VI)

wherein R is an alkyl radical of chain length C ₇ , C ₈ or C ₉ ,

E) 0.5% to 5% (based on the weight of the nonionic wetting agent) of an alcohol of the formula VII

R-OH (VII)

wherein R is an alkyl radical of chain length C ₇ , C ₈ or C ₉ and

F) 2.5% to 5% (based on the weight of the nonionic wetting agent) of an acid of the formula VIII

(VIII)

The new formulations have a very good wetting power over schwernetzbaren dusts, such. B, coal dust, the effect is also improved compared to the good Netzer formula III. Nonylphenol poly (oxyethylene) ethers with ejjiem ethoxylation levels of 8-10 and dioctylsulfosuccinate, known as good wetting agents, have a dipping power of TNV ₁₀₀ of 0.2 g / l and 0.75 g / l, respectively, but insufficiently wet coal dust. The proposed wetting agents hit a TNV ₁ Oo greater than 0.8g / l, but wet coal dust about 35 times faster. It is essential that the components A, D and E used are those compounds of the formulas III, VI and VII in which R is an alkyl radical which is uniformly composed with regard to the chain length distribution. If R is derived from an alcohol mixture, as is typical of native or synthetic surfactant alcohols, the wetting power deteriorates considerably compared with crosslinkable dusts

It is advantageous for the use of the novel wetting agents that they can also be used in calcium chloride solution having a salt content of up to 43%. The application of the wetting agents is substantially facilitated by the fact that the mixtures in aqueous solution hardly tend to form foams or the foams formed are more resistant.

The network capacity reaches optimum values when as components A, D and E solci ,? Compounds of formulas III, VI and VII are used, in which R is a 2-ethylhexyl and as component Asolche Alkylenoxidaddukte of formula III, in which χ is a number from 2.5 to 3.5, γ is a number of 2-3 and the ratio x: y was chosen so that the alkylene oxide adducts in water, which may also contain alkali or alkaline earth halides, soluble or emulsoid soluble

embodiments

The assessment of the wetting behavior was carried out indirectly by measuring the time required for 0.5 g of pulverized coal with a particle size of <0.07 mm in order to completely submerge after being placed on a solution of water, calcium chloride and wetting agent (sinking time). The ratio of coal dust to net solution was 1:33.

Table 1

Examples according to the present invention

wetting agent SaIz- Untersink conc. conc. Time Wt .-% Wt .-% S

wetting agent

1.88.5% A (R = 2-ethylhexyl, x = 2.6, y = 1.9) 0.6 20 40

0.5% B (m + n = 3; o + ρ = 2) 3% C (r = 3; q + s = 2) 2% D (R = 2-ethylhexyl) 2% E (R = 2-ethylhexyl ) 4% F

2.88.5% A (R = 2-ethylhexyl, χ = 2.6, y = 1.9) 0.9 35 340

0.5% B (m + η = 3; ο + p = 2) 3% C (r = 3; q + s = 2) 2% D (R = 2-ethylhexyl) 2% E (R = 2) Ethylhexyl) 4% F

* Wetting agent SaIz- Untersink conc. conc. Time wetting agent Wt .-% Wt .-% S

3. 90.5% A (R = 2-ethylhexyl; χ = 2.5; y = 2.0) 0.5% B (m + n = 3; o + p = 2) 2% C (r = 4; q + s = 3) 1% D (R = 2-ethylhexyl) 1% E (R = 2-ethylhexyl) 5% F

0.6

20

4. 90.5% A (R = 2-ethylhexyl; χ 0.5% B (m + n = 3; o + p = 2 2% C (r = 4; q + s = 3) 1% D ( R = 2-ethylhexyl) 1% E (R = 2-ethylhexyl) 5% F

2.5; y = 2.0)

0.9

35

330

Table 2 Examples of wetting agents of the formula III

wetting agent Salzkonz. Untersink- 45 conc. Time wetting agent Wt .-% Wt .-% S 400 5. 100% A (R = 2-ethylhexyl; χ = 2.2, y = 2.1) 0.6 20 0% B-F 6. 100% A (R = 2-ethylhexyl, x = 2.2, y = 2.0) 0.9 35 0% B-F Untersink Table 3 Time Examples of the prior art S wetting agent salt > 1800 conc. conc. > 1800 wetting agent Wt .-% Wt .-% > 7600 7. Nonylphenol ethoxylate (number of moles EO = 9.8) 0.6 20 400 8. Na dioctyl sulfosuccinate 0.6 20 9. Na dioctylsulfosuccinate 0.9 35 > 1800 10. Alkylene oxide adduct of the formula I. 0.6 20 (R = C ₆ -C ₁₀ JX = ^ y = 2.0) 860 11. Alkylene oxide adduct of the formula I. 0.9 35 (R = C ₆ -C ₁₀ , X = 2.5, y = 2.0) > 1800 12. Alkylene oxide adduct of the formula I. 0.6 20 (R = 2-ethylhexyl, χ = 6.1, y = 7) > 6000 13. Alkylene oxide adduct of the formula I. 0.9 35 (R = 2-ethylhexyl, χ-6.1, y = 7.8) > 7,600 14. Alkylene oxide adduct of the formula I. 0.6 20 (R = 2-ethylhexyl, χ = 21, y = 22) 15. Na salt of butylnaphthalenesulfonic acid 0.6 20

Claims (1)

1. Non-ionic wetting agent for attenuable dusts, such. Coal dust, characterized in that the nonionic wetting agent is nus A) 77% to 96%, based on the weight of the nonionic wetting agent, of an alkylene oxide adduct of the formula III RO- (C ₃ H ₆ O) _x - (C ₂ H ₄ O) _y -H (III) wherein R is an alkyl radical of chain length C ₇ , C ₈ or C ₉ , χ is a number from 1 to 4 and y is a number from 1.5 to 5, B) 0.5% to 2.5%, based on the weight of the nonionic wetting agent, of an alkylene oxide adduct of the formula IV