USRE23462E - Asphalt emulsion for treatment of - Google Patents

Description

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UNITED STATES PATENT F 23,462 FICE ASPHALT EMULSION FOR TREATMENT OF COAL AND METHOD OF PREPARING THE SAME Charles R. Rosencranse, Pittsburg,

signer of fifty per cent to Pittsburg, Kans.

Kana, as- Joe F. Kianer, Jr.,

No Drawing. Original No. 2,431,891, dated December 2, 1947, Serial 1944. Application for Serial No. 180,091

No. 527,482, March 21, reissue August 17, 1950,

6 Claims. (Cl. 106-277) Matter enclosed reissue specification;

The invention relates to a colloidal suspension of asphalt process of producing the same, of which the present application is a continuation-in-part.

An important object of the invention is to provide a substance which as a result renders the coal clean to handle and non-soiling with respect to other objects or materials with which the coated coal may come into contact.

By coal as referred to-herein, is meant bituminous, semi-bituminous, anthracite, semianthracite, or the so-called lignite coals, and others comprehended by these terms. The examples given hereinbelow as embodiments of the invention will be understood to be exemplary only and as not restricting the invention except as defined in the appended claims.

In preparing the desired colloidal suspension of asphalt which is to be sprayed on the coal for the purposes set forth above, it is necessary to use asphalt of low [initial] penetration of about. 2.6 to 3.0 mm. and high melting point of from [140 to 180 F.] 210 to 260 F., having certain characteristics. However, all such asphalts are not suitable. Some, for instance, do not exhibit the required ductility and adhesiveness to the coal, as judged by the coating they form on the coal, but are unduly brittle and chip or flake oil the coal. Others, although providing sufiicient ductility, produce excessive tackiness which causes the coal particles to stick together undesirably. For this reason processing of the asphalt as disclosed hereinbelow is essential to provide asphalt in the required form.

in heavy brackets appears matter printed in italics indie and run into the in the original patent but forms no part of this ates the additions made by reissue.

The source of the asphalt used is not critical and asphalt 15 to 18 mm.] has The method cm. [or

and efficient.

76.1-77.9 F. with the speed of 5 centimeters per minute.

Dimensions of the mold shall be such that, when properly assembled, it will form a briquette having the following dimensions:

Centimeter-s Total length 7.45 to 7.55

Distance between clips 2.97 to 3.03

Width at mouth of clip 1.98 to 2.02 Width at minimum cross section (halfway between clips) .99 to 1.01

Thickness throughout .99 to 1.01

For pulling the briquette apart, any apparatus may be used which is so constructed that the be continually immersed is found in the article proved machine for testing ductility of bitumi C. E. Cummins page 286 of the Industrial and Engineering Chemistry Journal, analytical edition, volume 9, No. 6, 1937.

In processing the selected asphalt, it is placed to F.,

feet of air per perature of from with approximately 4000 cubic minute, for about eight hours. penetration of the asphalt to about 26 to 30 or 2.6 to 3.0 mm. and raises its melting point to about from 210 to 260 Fahrenheit.

The resultant asphalt is then heated in a container to a temperature of about 300 Fahrenheit intake of a colloid mill simulby volume of the aqueous dispersion which .is'

described below and which has been heated in a This reduces the and critical rate of separate container to ,a temperature -;of about 180 Fahrenheit. The I esultantemulsionis.discharged into a heat exchanger by which its temperature is rapidly reduced to about 150 Fahrenheit, whence the emulsion is-run into storage containers. ,7

The said dispersion consists of the following components in substantially the proportions, by volume, set forth:

Per cent Water Resin (a substantially petroleum hydrocar- .cumulates -.-in the form-of-its sodium soap on the surface of the waste liquor.

v 1 such asis psedior spraying The coating material of the present invention, requiring no heating at above freezing temperatures, can be sprayed or atomized on the coal, directly from theastorage containers, by means of any suitable spraying equipment, includin other coal coating fluids.

Having described the invention, what is claimed Bentonite clay Tall oil r .10 Caustic soda 0.46

300 Fahrenheit before being run through "the colloid mill. This is necessary in order to bring the asphaltto a state qf snfiicient fluidity .to .mix

boiling point of wate s 212" Eahrenheitmln order to overcome gQIQ it was found necessary to produce ,and maintain a constant 110 while the combinedmasthe -,colloid mill, which terials are fed thr g depends upon the @158 through the colloidal mill is maintainedand the speed of the mill is not permitted to go above about half normal speed or ,'in the example, ,given 5,000 B. P. M.

The resultant colloidal suspension of asphalt does not need any special treatment and to be heated to render it usable after a long :period of storage, unless it has been stored at a 2temperature below its freezing temperature of about 32 Fahrenheit, in which ficient application of heat to restore it :to a fluid and atomizable or sprayable condition. Atx'lil Fahrenheit the material has a viscosity of 18, as compared with 10 for water at the same .temperature.

The resin component of the above dispersion is identified as a gasoline insoluble resin .ob* tained, for example, from pine wood by extraction of comminuted pine wood by a coal item by: drocarbon, removal of the mixture of solid resins, extracting such solid resin mixture by a volatile paramn hydrocarbon to remove rosin from said resin mixture, and covering a parafiinqhydro carbon-insoluble resin substantially ireegfmm rosin. Such a resin substance is disclosed and; claimed in Patent No. 2,193,026, ranted March 12, 1940, to Lucius Coleman Hall.

The tall oil component of the above dis.- persion disclosed in Patent No. 2,305,588 granted December 15, 1942, to Ernest Segessemann, isin general the resinous and fatty by-product Lobtained chiefly in the production otpaper pulp. from resin-bearing woods by the soecalled sul: phate'process. In the sulphate process wood is digested with an alkaline liquor containing so- :Qf used. I11 .other words, the rateorflowismot in itself critevent it requires only su f.- 1

* Itisto be noted that 'thdasphalt isheated to sion oi asphalt for spraying on consists in taking an asphalt of a type "having initially a penetration rating of about 8 to 10 mm. and a ductility rating of about [15 to 18 mm.] 150 to 180 em and zblowing the; asphalt at anoxidizing temperature of from 141. &to 180 F. in an oxidizingchamber with about .4=.0.0,0 cubic feet of airpeirninute :forabouteighthonrs to reduce the penetration of the-asphalt to about 2.6 to 3.0 mm. and sing its melting point to about from 210 to 260 IL, then heating the asphalt in a container a temperature not over 300 F., then simultaneonsly running the hot blown asphalt through colloid mill operating-at substantially 5,000 P. and eta-constant rate, together with anjaqueous-dispersion heated to about 180 F., said dispersion containing .by volume substantially 05i% of water, 3% of va substantially petroleum hydrocarbon insoluble pine wood resin, 1.4% ofbentonitc, 0.10% of stall oil, and 0.46% of caustic soda, then rapidly reducing the temperature of the resultant emulsion to about F., for storage.

2. Material adapted to .be sprayed at atmospheric temperature on coal and forming thereon a hard, dry and permanent coating rendering the coal dust-proof, moisture-proof and oxidation-proof and preventing the same trombocoming sticky and adhering to cause large lumps, consisting oi a colloidal suspension .of asphalt of a type having initially a low penetration and a high meltingpoint after being heated and blown in an oxidizing chamber with approximately 4,000 cubic feetof air .per minute for about eight hours and the penetration of the asphalt reduced to about 2.6 to 3.0 mm. and its melting point raised to about from 210 to 260 the resultant asphalt heated to a temperature of about 300 F. and simultaneously run through a colloid mill with an approximately equal amount by volume of an aqueous dispersion com posed of water 95.04 .a substantially petroleum. hydrocarbon insoluble pine wood resin 3.0%. bentonite clay 1.4% tall oil 0.10% and caustic soda 0.46% at a temperature of about 180 F. and the resultant emulsion rapidly reduced to a temperature of about 150 F. V

3. A-method of producing a coating coin-posh tion for coal for application as a spray at atmospheric temperatu e which consists in rum. ning a quantity of colloidal asphalt derived by the distillation of crude oil after having been previously heated in an oxidizing chamber to. temperature of from 140 to 180 F. and blown with approximately 4,000 cubic feet of air per minute for about eight hours to reducev the penetration of the asphalt to about 2.6 to 3.0 mm. and raising its melting point to about 210? to 7 260 F. and then'heated to a temperatureof about of to 150 F.

4. A method of producing a coating composition for coal for application as a spray at atmospheric temperature, which consists in simultaneously running through a colloidal mill oper ating at substantially 5,000 R. P. M., a hardened colloidal blown asphalt having a penetration of about 2.6 to 3.0 mm. and a melting point of about 210 to 260 and heated in a container to a temperature of about 300 F., with an equal volume of an aqueous dispersion heated to a temperature of about 180 F. and containing by volume 95.04% water, 3.0% of a substantially petroleum hydrocarbon insoluble pine wood resin, 1.4% of bentonite clay, 0.10% of tall oil and 0.46% of caustic soda and subsequently rapidly reducing the temperature of the resultant emulsion to about 150 F.

5. An asphaltic coal coating composition consisting of a colloidal emulsion of blown asphalt of a type characterized before [the] blowing by [low] high penetration and [high] low melting point and run into the intake of a colloidal min after being preheated to a temperature of about F., simultaneously with an approximately equal amount by volume of an aqueous dispersion at a temperature of about 180 F'. containing water 95.04%, a substantially petroleum hydrocarbon insoluble pine wood resin substantially free from rosin 3.0%, bentonite clay 1.4%, tall 011 0.10%, and caustic soda 0.46% and then rapidly reduced to a temperature of about 150 F.

6. A method of producing an asphaltic coal coating composition consisting in forming a colloidal emulsion of 50% by volume of hot blown asphalt heated to a temperature of about 300 F. and characterized by [initial] w penetration rating and high melting point CHARLES R. ROSENCRANSE.

REFERENCES CITED The following references are of record in the file of this patent or the original patent:

UNITED STATES PATENTS Number Number Smith: "Proc.

Name Date Kirschbraun Nov. 5, 1929 Symons June 2, 1931 Thompson Oct. 25, 1932 Watts Oct. 8, 1935 Spencer Aug. 2, 1938 Buckley Sept. 23, 1941 Porter Mar. 16, 1943 Barwell Feb. 1, 1944 De Laney June 6, 1944 FOREIGN PATENTS Country Date Great Britain May 25, 1926 Great Britain Dec. 30, 1926 Great Britain Sept. 8, 1937 Germany Feb. 10, 1938 OTHER REFERENCES Am. Soc. Testing Materials, 9,

Thurston: 286, 1937.

"J. Ind. Eng. Chem. (Anal. Ed.)," 9,

Asphalts and Allied Substances, Abraham, 1945, vol. II. DP. 985-993 and 1006-1015.