JPS5861180A - Additive for petroleum pitch-water slurry - Google Patents

Abstract

PURPOSE:To prepare an additive for petroleum pitch-water slurry, giving a slurry having high concentration and low viscosity and free from coagulation, precipitation and foaming, by using an alkali metal or alkaline earth metal salt of ligninsulfonic acid as an active component. CONSTITUTION:The objective additive can be prepared by using an alkali metal or alkaline earth metal salt of ligninsulfonic acid (e.g. calcium ligninsulfonate) as an active component, and if necessary, adding a solvent such as water, alcohol, etc., a gelatinizing agent, a rust-preventive, a surface active agent, etc. thereto. The additive is added to the slurry of petroleum pitch (preferably >=90 wt% of the pitch passes through a 200 mesh sieve) and water in an amount of preferably 0.05-0.5wt%. EFFECT:Even a slurry having a concentration of as high as 50-70wt% has low viscosity and high stability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a additive for petroleum pitch water slurry that stably disperses petroleum pitch powder in water.

More specifically, the present invention relates to an additive for obtaining a petroleum water slurry suitable for supply to a water gas generator.

Methods of obtaining water gas by gasifying solid fuels such as coal are well known. As one method.

1-i] There is a method of pulverizing the body material into fine powder and supplying it to a water gas generator as a dispersion in a gas medium such as water vapor or nitrogen-containing gas. However, with this method, it is difficult to control the amount and rate of solid fuel supplied to the water gas generator. For this reason, in recent years a method has been proposed in which powdered solid fuel is dispersed in water to form a slurry and the slurry is supplied to a water gas generator, but this method has two problems.

The solid fuel-water slurry for water gas generation preferably has the following properties.

■ The solid content concentration should be as high as possible.

■Viscosity should be as low as possible.

■ The solid fuel powder must be stable without agglomeration or sedimentation.

In particular, when the solid fuel is petroleum pitch, the surface is highly hydrophobic, so a system of only petroleum pitch powder and water will often aggregate into a solid state even if strong stirring is applied, so it is necessary to stir thoroughly. Even if a uniformly dispersed state is obtained, agglomeration will soon occur and a hard sedimentary layer will be formed.

This petroleum pitch is obtained by thermally decomposing the vacuum distillation residue of petroleum at a higher temperature, and its powder is extremely difficult to wet with water compared to coal powder containing inorganic substances.

The present invention provides petroleum pitch that satisfies the conditions of (1) to (3) above.
Provides additives for water slurries.

Namely, the present invention is an additive for petroleum pitch-water slurry, which contains an alkali metal salt or alkaline earth metal salt of geninsulfonic acid as an active ingredient.

As mentioned above, the petroleum pitch targeted by the present invention is a decomposition residue obtained by thermally decomposing the vacuum distillation residue of filter oil at a higher temperature.
Softening point in the range of 60 to 190°C (J-K S K-22
, 07-1980). Also,
Residual carbon of this petroleum pitch (J Engineering S K-227 (1)
-1980) is usually between 40 and 80% by weight. Oil pitch is.

It is clearly distinguished from petroleum coke, which is obtained by coking the vacuum distillation residue of petroleum and does not have a softening point.

Specific examples of alkali metal salts or alkaline earth metal salts of ligninsulfonic acid include its lithium salt, sodium salt, potassium salt, and calcium salt.

Examples include barium salt.

The additive for petroleum pitch-water slurry of the present invention is:

Contains an alkali metal salt or alkaline earth metal salt of ligninsulfonic acid as an active ingredient, and further contains water.

/Surfactant 1 An amphoteric surfactant or the like may be contained.

Although the pulverization of petroleum-single grains, which is the object of the present invention, may be carried out by a dry method or a wet method carried out in water, the wet method is free from the problem of dust generation. Pulverizers include pin type mills, gear disc mills, and gear colloid mills.

Ball mill, tube mill, tower mill, rod mill,
Any known grinding machine such as a camera mill can be used. The particle size of petroleum pitch is not particularly specified, but it is 20
It is preferable that a weight of 7ON or more passes through a mesh of 0 mesh, and more preferably 90 weight or more.

The ease of use of the petroleum pitch-water slurry additive of the present invention is as follows:
As the active ingredient of pyrigenine sulfonic acid or its salt, in the slurry, o, o i ~ 5% by weight, preferably 0.0
°5 to 0.5% by weight. If the amount is less than 1% by weight, the effect will be small, and if it exceeds 5% by weight, the effect will not be so great, which is economically disadvantageous.

In the case of dry-ground petroleum pitch powder, the additive of the present invention is preferably dissolved in water and mixed. In the case of wet-milling low petroleum pitch in water, the additive is used before or during milling. It may be added to the mill or to the slurry after grinding.

By using the additive of the present invention, a petroleum pitch-water slurry with a high concentration of 50 to 70% by weight of petroleum pitch powder can be obtained, and the resulting slurry has a low viscosity, is stable, and does not cause agglomeration or sedimentation. No foaming.

Therefore, the petroleum pitch-water slurry prepared using the additives of the present invention can be easily controlled when fed to a water gas generator.

Next, the present invention will be explained using examples. The properties of the raw petroleum pitch used in the examples are shown below.

Particle size distribution 6.5 mesh sieve 6.0% by weight3.
5 to 20 mesh 78.4% by weight 20 mesh sieve
18.6% by weight Softening point 175-185°C Residual carbon 78.0% by weight Examples 1 and 2 Raw material petroleum pitch 120 (NF and calcium lignin sulfonate) was placed in a ball mill with an internal volume of 20 tons and a ball filling rate of 60 inches. Fill with aqueous solution 8007 in which a fixed amount is dissolved.
Petroleum pitch was wet-milled for 62 minutes at room temperature to 40°C to obtain a petroleum pitch-water slurry with a solid content of 60% by weight. This slurry could be easily taken out of the ball mill due to its low viscosity.

The obtained slurry was poured into a stainless steel cylinder with a diameter of 5 crrL and a height of 20 cm, with a number outlet with a stopper located 6 cm and 12 cm from the bottom, 18 cm from the bottom.
*il*fiiK [left at 4o°C for 3 days. Next, the cylinder was divided into an upper layer above 12 cm, a middle layer between 6 cm and 12 cm, and a lower layer below 6 cm, and the solid content of each layer was measured. The results are shown in Table 1 along with the slurry viscosity and the percentage of crushed petroleum pitch particles passing through the 200 mesh sieve.

Comparative Example 1 Example 1 was repeated except that calcium ricninsulfonate was used.

The resulting slurry had a viscosity of 1000 c.p. or more, and lump-like aggregates remained, making it difficult to remove it from the ball mill.

Examples 3 to 5 Aqueous solutions in which raw petroleum pitch and predetermined amounts of additives listed in Table 1 were dissolved were heated at 50 Kp/hour and 60 Kp/hour, respectively.
Tower mill [manufactured by Nippon Tower Mill ■, VW] at the rate of t/hour
2 petroleum pitch was continuously crushed for 7 hours.

The results are shown in Table 1.

Written amendment to the procedure Date of May 2, 1980 To the Commissioner of the Japan Patent Office 1 Indication of the case Patent application No. 159501/1982 2 Title of the invention Petroleum pitch - Additive for water slurry 3 Relationship with the person making the amendment Patent application Postal code 755 1-12-32 Nishihonmachi, Ube City, Yamaguchi Prefecture (020)
Ube Industries, Ltd. 4 Column 5 of Detailed Description of the Invention of the Specification Subject to Amendment, Contents of Amendment (1) The description of l'-190J in the 7th line of the 3rd page is amended to 1290''.

(2) The description "1175-185" on the second line of page 6 is corrected to "1210-230".

that's all

Claims (1)

[Claims] An additive for petroleum pitch-water slurry containing an alkali metal salt or super-alkali metal salt of ligninsulfonic acid as an active ingredient.