JPS5811590A - Coal liquefaction - Google Patents

Abstract

PURPOSE:To liquefy coal easily at low cost, by stirring coal with an alkali solution. CONSTITUTION:For example, 100pts.wt. coal such as bituminous coal, brown coal, etc. having a particle size of 80-100 meshes is blended with preferably 45-55pts.wt. aqueous solution of a hydroxide, carbonate, etc. of an alkali (alkaline earth) metal, stirred under heating at 40-70 deg.C, and the coal is made into a brown slurry substance. The slurry substance is extracted with a solvent such as benzene, pyridine, etc., to give a light oil, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for liquefying coal using an alkaline solution.

Conventionally known coal liquefaction methods generally involve adding hydrogen directly or indirectly to coal under heating and pressurization to liquefy it.

Such coal liquefaction methods mainly include the solvolysis method, the solvent extraction method, and the direct hydrogenation method, but all of them have the disadvantage that they are not economically viable.

The present inventor unexpectedly discovered that an alkaline solution dissolves coal, and has accomplished the present invention.

That is, the present invention is a coal liquefaction method in which a slurry-like substance is obtained by stirring coal and an alkaline solution, and this slurry-like substance is extracted with a solvent.

Coal used in the present invention ranges from bituminous coal to lignite, but bituminous coal and lignite tend to liquefy.

The particle size of the coal is 100 mesh or less, preferably 80-1
It is 00 mesh. If it is less than 80 meshes, it will take time to liquefy, and if it is more than 100 meshes, the cost will be high.

The alkaline solutions used in the present invention include aqueous solutions of hydroxides of alkali metals, 13a and Sr, aqueous carbonate solutions of alkali metals, aqueous solutions of basic oxides (oxides of alkali metals, alkaline earth metals, etc.), alkali Examples include aqueous metal carbonate solutions, alkali metal hydrogen carbonate aqueous solutions, ammonia aqueous solutions, alcohols, amine aqueous solutions, and the like.

In the present invention, coal and alkaline solution are stirred, and the mixing ratio is 40 parts of alkaline solution to 100 parts of coal.
-60 parts by weight, preferably 45-55 parts by weight.

In other cases, liquefaction is not impossible, but the yield will be lower.

The pulverized coal and alkaline solution are placed in a suitable stirring pot, heated to an internal temperature of about 40°C to 70°C under normal pressure, and then stirred at 7oor, p, m for about 90 minutes to 210 minutes. The powder becomes a brown slurry.

This slurry material is subjected to solvent extraction. The solvent used is aromatic solvents such as benzene, toluene, xylene, etc., or polar organic solvents such as pyridino, but is not limited to these, and any solvent may be used as long as extraction is possible.

Solvent extraction is repeated until the solvent used is no longer colored.

Next, the solvent was distilled off from the mixture of the extract and the solvent to obtain a coal liquid. When using Miike charcoal, the infrared absorption spectrum of this material was obtained by the conventional hydrogenation method.
The absorption spectrum appeared almost at the cave.

Note that the coal liquid obtained by the present invention has a small molecular weight when compared to crude oil, and is considered to correspond to light crude oil or extra light crude oil.

Note that carbonization is performed to distill heavy oil and solid fuel from the residue after solvent extraction.

At this time, a single catalyst or a mixture of carbon dioxide, acid clay, alumina, etc. is used as a catalyst, and when heated to about 600° C., heavy oil is distilled out and a coke-like solid fuel is obtained as a residue.

When coal is liquefied by adding hydrogen, what remains as a residue is ash.

As described above, according to the present invention, it is possible to easily liquefy coal using an alkaline solution so that e=■ability is achieved, and an economically profitable method for liquefying coal can be provided.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 Stirring resulted in a substance that facilitates coal liquefaction.

This material has a specific gravity of 1.0221 and a viscosity of 27.2 mm poise.

50 parts by weight of this material was ground into 100 meshes or less and stirred for 120 minutes while heating at 50°C to obtain a brown slurry material. This slurry material was subjected to solvent extraction using a Soxhlet fat extractor (Jts-ni-0101).

Extraction was carried out for 480 minutes using Be/zey 1000 City V part as a solvent, and as a result, a coal liquid having a weight of 27 ml was obtained.

Example 2 A material was obtained that facilitated coal liquefaction by stirring.

The properties of this substance are a specific gravity of 1.0151 and a viscosity of 23 mnt poise.

This substance is Miike charcoal (bituminous coal) that has been crushed to less than 100 mesh with 53 parts of heavy acid and a heating element of 7,300 kCal/kg, and its industrial analysis values are 1.6 g for moisture, 8.3 g for ash, and 40.09 g for volatile content. and 100 parts by weight of fixed carbon (50.1%) were heated to 50° C. and stirred for 150 minutes to obtain a brown slurry material.

This slurry material was applied to the same extraction device as in Example 1, and extracted for 280 minutes using 1000 parts by weight of benzene as a solvent. 21 parts by weight of coal liquid was obtained.

Eh, about! A substance that facilitates coal liquefaction was obtained by stirring while heating to 15°C.

53 parts by weight of this substance and the Canadian patent applicant used in Example 1: Sadato Betsuto, Yukihiro Obe, Satoshi Obe, Masawa Daibe, agent, and Katsuhiko Kajihara, patent attorney.

Claims (1)

[Claims] A coal liquefaction method characterized by stirring coal and an alkaline solution to obtain a slurry-like substance, and extracting this slurry-like substance with a solvent.