JP2745653B2 - Method for producing carbon black base oil - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a carbon black raw material oil.

(Prior Art) As a carbon black raw material oil, a tar oil generated from a coke oven or an ethylene bottom oil or FCC (fluid catalytic cracking) oil obtained at the time of petroleum cracking is generally used.

(Problems to be Solved by the Invention) Tar from a coke oven used as a conventional carbon black feedstock has a very low yield of 3 to 4% to coke from coal, or is limited by coke quality. There is a drawback that coal is limited to expensive coal such as strongly caking coal.

(Means for Solving the Problems) As a result of intensive studies in view of the above points, the present inventors have conducted instantaneous devolatilization by rapid pyrolysis using inexpensive coal with low carbonization as a raw material, and After obtaining the product and removing the light oil therefrom, it is separated into oil and pitch by a method such as distillation or static separation, and it has been found that this oil can be used as a carbon black raw material oil in view of its properties. Was.

According to the method of the present invention, a raw material oil of carbon black can be obtained in higher yield than inexpensive inferior coal.

That is, the gist of the present invention is to provide a carbon black base oil characterized in that tar obtained by rapid pyrolysis using coal as a raw material is treated by distillation or standing separation, and the obtained oil is used as a carbon black base oil. Lies in the manufacturing method.

 Hereinafter, the present invention will be described in detail.

FIG. 1 is a schematic diagram showing one embodiment of the method of the present invention. The raw material coal pulverized to a predetermined particle size is fed at a constant feed rate to a vertical entrained flow reactor (3) in a reaction furnace (4) using a coal feeder (1). On the other hand, the carrier gas ((5) is a carrier gas flow meter) heated to a predetermined temperature in the preheating furnace (2) is also sent to the reactor (3) at the same time, where the coal powder contacts the high-temperature carrier gas. The coal is then heated and pyrolyzed in a very short time. The char of the pyrolysis residue is collected in a char receiver (7), and gas and tar vapor are cooled in the next cooling trap (8), and a liquid product such as tar is cooled in this cooling trap (8). ) And only the gas is discharged out of the system by the blower (10) ((6): differential pressure gauge, (9): gas sampler).

After removing the light oil from the tar obtained here, the tar is separated into oil and pitch by a method such as distillation or stationary separation, and this oil is used as a raw material oil for carbon black.

As the raw coal, low-grade coal (brown coal, sub-bituminous coal) such as low-coking coal or non-coking coal with a low degree of coalification is usually used. or,
The crushed particle size of coal is generally −3 m / m, about 80% or less, and desirably, coal having a particle size of 35 mesh or less is used.

Regarding the temperature of pyrolysis of raw coal, it depends on the type of coal, but from around 650 ° C, the C-C bonds in the coal molecular structure become severely cracked and the yield of hydrocarbon gas and liquid products increases. . On the other hand, when the temperature exceeds about 850 ° C., the conversion of the once generated radical component having a high molecular weight to char by virtue of polycondensation becomes severe, and the conversion of carbon into a liquid product starts to decrease again. Therefore, the reaction temperature is generally 600 to 100
0 ° C, desirably about 650 to 850 ° C is appropriate.

The reaction time is difficult to determine uniquely because the heating rate changes depending on the temperature, residence time, etc., but the heating rate of coal is about 10 seconds, and the heating rate of coal is several degrees to about 10 ⁶ ° C / sec. Heating is appropriate.

As the carrier gas, an inert gas such as nitrogen, argon, or combustion exhaust gas, or an active gas such as hydrogen, methane, or coke oven gas is used, and the temperature of the carrier gas is suitably about 600 to 1000 ° C.

In order to separate oil from tar obtained by rapid pyrolysis, residual or stationary separation is generally used.

Distillation removes light oil from the resulting liquid product,
It is preferable to employ a method in which distillation is performed under reduced pressure at a temperature of 300 ° C. and 10 to 200 torr to obtain a distillate oil as a carbon black raw material oil.

In addition, for the stationary separation, for example, twice the amount of a solvent (a petroleum-based oil having an anti-solvent effect with respect to a coal-based tar oil, specifically kerosene) is added to the obtained liquid product after removing the light oil. Is added, and the mixture is stirred well under heating at about 140 ° C. to 260 ° C., and then allowed to stand. Separated into an upper layer and a lower layer from the interface, and the solvent used in each layer is removed to obtain the upper layer. A method in which the oil component is used as a carbon black feedstock is preferred.

(Examples) Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples unless it exceeds the gist of the present invention.

Example 1 Kerosene as a solvent using a liquid product (each product yield is shown in Table 3) (hereinafter abbreviated as tar) obtained from the coal shown in Table 1 as a raw material under the reaction conditions shown in Table 2. With tar / kerosene = 1/2 at 160 ° C for 30 minutes and then at the same temperature
After standing for 60 minutes, the upper oil was fractionated, and the properties of the oil after the kerosene was removed by distillation were analyzed using a commonly used carbon black base oil (tar from a coke oven). Creosote oil) in Table 4.

(Effect of the Invention) By using an oil component obtained by subjecting a liquid product obtained by rapid pyrolysis of coal to a treatment such as distillation or stationary separation as a carbon black raw material oil, a raw material oil can be obtained from inexpensive inferior coal at high yield. Can be obtained.

[Brief description of the drawings]

 FIG. 1 is a schematic diagram showing one embodiment of the method of the present invention. 1: Coal feeder 2: Carrier gas preheating furnace, 3: Reactor 5: Carrier gas flow meter, 7: Char receiver 8: Cooling trap, 10: Blower

Continuation of the front page (72) Inventor Tetsuharu Umehara 1 Sakaide-cho, Sakaide-shi, Kagawa Prefecture Mitsubishi Chemical Corporation Sakaide Factory (56) References JP-A-63-230778 (JP, A) JP-A-60-166348 (JP) , A)

Claims (1)

(57) [Claims] An oil component is separated from tar obtained by pyrolyzing coal by raising the temperature of the coal to 600 to 1000 ° C. in a time of 10 seconds or less, and this is used as a raw material oil for carbon black. Of producing carbon black base oil.