JP3807198B2 - Method for diluting residue produced as a by-product in the production process of bisphenol A and fuel oil containing the residue - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for diluting a residue by-produced in a bisphenol A production process and a fuel oil containing the residue.
[0002]
[Prior art]
In the bisphenol A production process, a heavy residue with a high boiling point is by-produced. This residue is solid at room temperature, and until now, in many cases, it is treated as waste as it is.
However, it is clear that such processing is not preferable from the viewpoint of resource saving.
According to Japanese Examined Patent Publication No. 6-70229, there is a method in which a residue produced as a by-product in a production process of bisphenol A is dissolved in a by-product oil mainly composed of an aromatic hydrocarbon having 8 or more carbon atoms and effectively used as a fuel. It is shown. However, the by-product oil mainly composed of aromatic hydrocarbons used as a dilution medium for residues in this method has problems such as clogging of high-viscosity residues due to insufficient mixing as well as insufficient solubility in the residues. Is included.
[0003]
[Problems to be solved by the invention]
This invention makes it the subject to provide the industrially advantageous method for utilizing effectively the residue byproduced in the manufacturing process of bisphenol A, and the fuel oil containing this residue.
[0004]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have completed the present invention.
That is, according to the present invention, the residue produced as a by-product in the bisphenol A production process comprises mixing an aromatic ether-based by-product oil obtained in the phenol production process as a dilution medium, There is provided a method for diluting a residue produced as a by-product in the bisphenol A production process, wherein the mixing weight ratio with the residue is in the range of 0.2 to 2.0.
Further, according to the present invention, an aromatic ether-based by-product oil having a temperature of 60 to 170 ° C. obtained in the phenol production process is mixed as a dilution medium with a residue having a temperature of 180 to 230 ° C. by-produced in the bisphenol A production process. A mixing step, a circulation step for extracting the mixture obtained in the mixing step from the mixing step, a circulation step for circulating the mixture to the mixing step, and a cooling step for cooling the circulating liquid, and mixing the by-product oil and the residue Provided is a method for diluting a residue by-produced in a bisphenol A production process, wherein the weight ratio is 0.2 to 2.0, and the temperature of the cooling mixture is in the range of 80 to 150 ° C. .
Further, according to the present invention, the by-product oil comprises a mixture obtained by mixing an aromatic ether-based by-product oil obtained in the phenol production process as a dilution medium with a residue by-produced in the bisphenol A production process. There is provided a fuel oil characterized in that the mixing weight ratio between and the residue is in the range of 0.2 to 2.0.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The raw material used in the present invention is a residue produced as a by-product in the bisphenol A production process. In the step of producing bisphenol A, a step of decomposing a distillation residue obtained when the crude bisphenol A is purified by distillation in the presence of a basic catalyst such as sodium hydroxide is provided.
The residue by-produced in the production process of bisphenol A as referred to in the present specification (hereinafter also simply referred to as residue) means a residue (decomposition residue) by-produced in the decomposition step. This residue is an asphalt-like high boiling point heavy substance and is solid at room temperature. Moreover, this residue is discharged | emitted in the heating state of the temperature of 180-230 degreeC, especially 200-220 degreeC from the said decomposition | disassembly process.
[0006]
In the present invention, an aromatic ether-based by-product oil (hereinafter also simply referred to as a by-product oil) produced as a by-product in the phenol production process used as a dilution medium for the residue is obtained when the crude phenol is distilled and purified in the phenol production process. Refers to the distillation residue oil produced. In this case, the type of the phenol production process is not particularly limited, and can be a cumene method, a toluene method, or the like, but is preferably a cumene method that is widely practiced.
[0007]
The by-product oil is a high-boiling product mainly composed of an aromatic ether and is liquid at room temperature. Its viscosity (100 ° C.) is 1 to 5 cP, in particular 1 to 3 cP. The by-product oil is discharged from the distillation tower in a heated state at a temperature of 60 to 170 ° C., particularly 80 to 100 ° C. This by-product oil has a high dissolving power and a thinning effect on the residue, and the amount of the by-product oil required to dissolve 1 kg of the residue is 0.2 kg. Further, the viscosity at 100 ° C. of a solution obtained by mixing and dissolving 1 kg of the residue in 0.2 kg of by-product oil is about 100 cP.
[0008]
The present invention is characterized in that an aromatic ether-based by-product oil obtained in the phenol production process is mixed as a diluent medium with the residue produced as a by-product in the bilphenol A production process. In this case, the mixing weight ratio [by-product oil] / [residue] of the by-product oil and the residue is 0.2 to 2.0, preferably 0.2 to 1.0, more preferably 0.25 to 0. .5. If the mixing weight ratio is smaller than the above range, problems such as poor flow in the piping and blockage due to insufficient dissolution occur, such being undesirable.
[0009]
In order to make the mixture easy to handle and to remove heat input from the heat of the circulation pump and circulation pipe for mixing, the temperature is 80 to 150 ° C., preferably 100 ° C. It is preferable to adjust to ˜120 ° C.
In addition, the viscosity said by this specification is measured using the normal rotational viscometer.
[0010]
The mixture is a solution in which a residue is dissolved in a by-product oil, and the viscosity at 100 ° C. is 20 to 500 cP, particularly 200 to 300 cP.
[0011]
Next, the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a flow sheet for carrying out the present invention, and FIG. 2 shows another example.
1 and 2, 1 is a dissolution tank, 2 is a pump, and 3 is a cooler.
[0012]
In order to mix the residue and the by-product oil according to FIG. 1, the by-product oil is supplied to the dissolution tank 1 through the line 5 and the residue is supplied through the line 6 and the line 7. The mixture is withdrawn through line 8 and pump 2 and sent to a predetermined location through line 9.
The temperature of the by-product oil is 50 to 170 ° C., preferably 80 to 100 ° C., and the temperature of the residue is 180 to 230 ° C., preferably 200 to 220 ° C.
In this method, the ratio of the residual flow rate through line 6 and the by-product oil flow rate through line 5 is adjusted so that the mixture passing through line 9 has a temperature of 60-170 ° C., preferably 80-100 ° C. It is good to do.
[0013]
In order to mix the residue and the by-product oil according to FIG. 2, the by-product oil having a temperature of 50 to 170 ° C., preferably 80 to 100 ° C. is supplied to the dissolution tank 1 through the line 5, and the temperature is 180 to 230. A residue at 200 ° C., preferably 200-220 ° C. is fed through line 6 and line 12. In addition, a portion of the cooled mixture is fed through line 11 and line 12.
From the dissolution tank 1, the mixture is withdrawn through a line 8 and a pump 2, and cooled in an indirect contact with a cooling medium in a cooler 3. The cooled mixture is withdrawn from the cooler 3 through the line 10, a part thereof is circulated to the dissolution tank 1 through the lines 11 and 12, and the remainder is transferred to a predetermined place through the line 9.
[0014]
In this method, the cooling medium temperature in the cooler 3, the flow rate of the cooling mixture through the line 11, so that the mixture through the line 9 has a predetermined temperature, for example, 60 to 170 ° C., preferably 80 to 100 ° C. The flow rate of the residue passing through the line 6 and the flow rate of the by-product oil passing through the line 5 are appropriately adjusted. In the case of this method, the [by-product oil] / [residue] mixing weight ratio is maintained in the range of 0.2 to 2.0, preferably 0.2 to 1.0, and 50 to 170 ° C., preferably 80. A mixture of ˜100 ° C. can be obtained.
[0015]
The mixture of the by-product oil and the residue obtained by the method of the present invention has a viscosity at 100 ° C. of 300 cP or less, is easy to transport by pipe, and is easily sprayed and burned through a burner. Can do. The calorific value is usually about 35 MJ per kg. Therefore, the mixture can be used as fuel oil.
When using the said mixture as fuel oil, it is good to prescribe | regulate the mixing weight ratio of the byproduct oil and a residue in the range of 0.2-2.0, Preferably it is 0.2-1.0. Moreover, the temperature is 80-150 degreeC, Preferably it is good to prescribe | regulate in the range of 100-120 degreeC. Such a mixture can be safely and smoothly piped and sprayed and burned smoothly and efficiently using a burner.
The mixture can be effectively used as a fuel oil, but in some cases, it can be incinerated.
[0016]
【Example】
Next, the present invention will be described in more detail with reference to examples.
[0017]
Example 1
A mixture of by-product oil and residue was prepared according to the flow sheet shown in FIG. The main operating conditions at that time are shown below.
(1) Line 5 (By-product oil)
(I) Flow rate: 3500 kg / h
(Ii) Temperature: 80 ° C
(2) Line 6 (residue)
(I) Flow rate: 640 kg / h
(Ii) Temperature: 210 ° C
(3) Dissolution tank (stirring tank) 1
(I) Residence residence time: 5 minutes (ii) Temperature of the product mixture: 100 ° C
(4) Line 9 (mixture)
(I) Flow rate: 4140 kg / h
(Ii) Temperature: 100 ° C
[0018]
Example 2
A mixture of by-product oil and residue was prepared according to the flow sheet shown in FIG. The main operating conditions at that time are shown below.
(1) Line 5 (By-product oil)
(I) Flow rate: 200 kg / h
(Ii) Temperature: 80 ° C
(2) Line 6 (residue)
(I) Flow rate: 640 kg / h
(Ii) Temperature: 210 ° C
(3) Dissolution tank (stirring tank) 1
(I) Residence time of feed (by-product oil + residue): 5 minutes (ii) Temperature of product mixture: 115 ° C
(4) Line 10 (cooling mixture)
(I) Flow rate: 4640 kg / h
(Ii) Temperature: 100 ° C
(5) Line 11 (circulation cooling mixture)
(I) Flow rate: 4000 kg / h
(Ii) Temperature: 100 ° C
(6) Line 9 (cooled mixture product)
(I) Flow rate: 840 kg / h
(Ii) Temperature: 100 ° C
[0019]
It was confirmed that the mixtures obtained in Examples 1 and 2 could be easily spray burned using a burner. Moreover, it was confirmed that the pipe transportation of the mixture can be carried out smoothly even at 80 ° C.
[0020]
【The invention's effect】
The mixture obtained by the present invention can be effectively used as a fuel oil. Therefore, the present invention can simultaneously achieve effective utilization of the by-product oil by-produced in the phenolanol production process as well as the residue by-produced in the bisphenol A production process, and its industrial significance is great.
[Brief description of the drawings]
FIG. 1 shows an example of a flow sheet for carrying out the present invention.
FIG. 2 shows another example of a flow sheet for carrying out the present invention.
[Explanation of symbols]
1 Dissolution tank 2 Pump 3 Cooler

Claims (4)

It consists of mixing an aromatic ether-based by-product oil obtained in the phenol production process as a diluent medium with a residue by-produced in the bisphenol A production process. A method for diluting a residue produced as a by-product in the production step of bisphenol A, characterized in that the raw oil / residue) is in the range of 0.2 to 2.0. The process according to claim 1, wherein the temperature of the mixture obtained by mixing the by-product oil and the residue is 100 to 150 ° C. In the mixing step, an aromatic ether-based by-product oil having a temperature of 60 to 170 ° C. obtained in the phenol manufacturing step is mixed as a diluent medium with a residue having a temperature of 180 to 230 ° C. by-produced in the bisphenol A manufacturing step. After the resulting mixture is extracted from the mixing step, it comprises a circulation step for circulating to the mixing step and a cooling step for cooling the circulating liquid, and the mixing weight ratio of the by-product oil and the residue is 0.2-2. 0.0, and the temperature of the cooling mixture is in the range of 80 to 150 ° C., A method for diluting a residue by-produced in the bisphenol A production process. It consists of a mixture obtained by mixing an aromatic ether-based by-product oil obtained in the phenol production process as a diluent medium with respect to the residue by-produced in the bisphenol A production process, and the mixing weight ratio of the by-product oil and the residue A fuel oil characterized by having a value in the range of 0.2 to 2.0.

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