JPH06104239B2 - Sulfuric acid pitch treatment method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sulfuric acid pitch treatment method for making harmless use of sulfuric acid pitch produced by petroleum refining.

[0002]

2. Description of the Related Art Sulfuric acid is used to wash petroleum in the washing step of petroleum refining processes. A large amount of sulfuric acid pitch is discharged as a residue from this washing process. In order to prevent pollution by this sulfuric acid pitch, it is necessary to appropriately treat the generated sulfuric acid pitch to render it harmless. For this reason, conventionally, the oil in the sulfuric acid pitch is separated by flotation to recover the oil and then incinerated.

[0003]

However, in order to incinerate sulfuric acid pitch, an intermediate treatment for recovering oil and a final treatment for incineration are required, so that the treatment facility becomes large and the treatment takes time. There was a disadvantage.
Further, the treatment cost is very high, for example, about 200,000 to 300,000 yen per ton, and it is not easy to rapidly treat a large amount of sulfuric acid pitch.

The present invention has been made to solve the above disadvantages, and an object thereof is to propose a sulfuric acid pitch processing method capable of quickly processing sulfuric acid pitch at a low price and reusing the processed product. To do.

[0005]

The sulfuric acid pitch treatment method according to the present invention is a method in which an inorganic cement-based solidifying material and water are added to and mixed with sulfuric acid pitch, and a neutralizing agent is added to the formed homogeneous mixture and then mixed. It is characterized by being heated, dehydrated and aggregated.

[0006]

In the present invention, the inorganic cement-based solidifying material and water are added to and mixed with the sulfuric acid pitch, and the surfactant contained in the inorganic cement-based solidifying material disperses and emulsifies the oil contained in the sulfuric acid pitch. Further, the concentration of sulfate ion is lowered by the hydration reaction of the inorganic cement-based solidifying material.

A lime-based neutralizing agent is added to this mixture and mixed to neutralize, and then heated and dehydrated. During this heating and dehydration, it aggregates with the neutralizing agent lime.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a process chart showing the processing procedure of an embodiment of the present invention. As shown in the figure, the treatment method for detoxifying sulfuric acid pitch is as follows.
It has a heating and dehydration step 3 and a crushing step 4.

In the case of treating sulfuric acid pitch with the treatment method configured as described above, first, in the oil dispersion step 1, the sulfuric acid pitch is treated with, for example, Portland cement having a composition component as shown in FIG. An inorganic cement-based solidifying material having the same components is added with several percent and water and mixed with a mixer to form a uniform mixture.

As described above, by adding the inorganic cement-based solidifying material and water to the sulfuric acid pitch and mixing them, the surfactant contained in the inorganic cement-based solidifying material disperses and emulsifies the oil contained in the sulfuric acid pitch. The solid mixture can be solidified because the solidification inhibiting effect of oil is removed.

When the inorganic cement-based solidifying material and water are added to the sulfuric acid pitch and mixed, the homogeneous mixture immediately becomes highly alkaline due to the hydration reaction of the inorganic cement-based solidifying material, and the pH becomes about 12. Neutralization step 2 in which slaked lime or cement is added to the homogeneous mixture thus formed and stirred is entered. After being diffused for about 5 to 30 minutes in the neutralization step 2, the fluid mixture is sequentially heated and sent to the dehydration step 3 to be heated to remove water and solidify. When the mixture is solidified by heating and dehydration, the mixture is aggregated and solidified by the lime component contained in the mixture. Crushing step 4 of this solidified mixture
The product is crushed into a certain size, for example, a size of 1 cm or less, to obtain the final processed product.

Thus, the sulfuric acid pitch is directly detoxified without removing the oil content contained in the sulfuric acid pitch, so that the processing equipment can be simplified and the detoxification can be performed in a short time.

The final treated product obtained by treating sulfuric acid pitch is neutralized and solidified, so that it can be reused as a burner for cement or an admixture for cement.

In the above examples, the case where the sulfuric acid pitch was dispersed and neutralized in two steps was explained, but the inorganic cement-based solidifying material, water and the neutralizing agent were simultaneously added to the sulfuric acid pitch and mixed. Therefore, oil dispersion and neutralization may be performed in one step.

[0015]

As described above, the present invention disperses and emulsifies the oil contained in the sulfuric acid pitch by adding the inorganic cement-based solidifying material and water to the sulfuric acid pitch to remove the solidification-inhibiting effect of the oil. After that, a lime-based neutralizing agent is added, mixed and neutralized, and then heated, dehydrated and solidified to detoxify sulfuric acid pitch, so detoxify sulfuric acid pitch in a short time with simple equipment. You can Therefore, the sulfuric acid pitch can be detoxified at a treatment cost of about 1/10 of that of the conventional detoxification treatment method.

Further, since the final treated product formed by this method is surely neutralized and solidified, it can be reused as a combustor for cement or an admixture material for cement, which contributes to effective resource utilization. Can be used.

[Brief description of drawings]

FIG. 1 is a process chart showing a processing procedure of an embodiment of the present invention.

FIG. 2 is a characteristic diagram of composition components of the inorganic cement-based solidifying material used in the above examples.

[Explanation of symbols]

 1 Oil dispersion process 2 Neutralization process 3 Heating and dehydration process 4 Crushing process

Claims (1)

[Claims] 1. An inorganic cement-based solidifying material and water are added to and mixed with sulfuric acid pitch, and a neutralizing agent is added to and mixed with the formed homogeneous mixture, which is then heated and dehydrated to form aggregates. Method for treating sulfuric acid pitch.