JPH0670229B2 - Method for treating residue by-produced in bisphenol A production process - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for treating a residue produced as a by-product in a bisphenol A production process. More specifically, it intends to utilize the residue produced as a by-product in the bisphenol A production process as a fuel.

[Conventional technology]

A part of the residue produced as a by-product in the bisphenol A production process is used as an additive for resins and the like, but most of it is discarded as industrial waste because of low demand for them.

[Problems to be Solved by the Invention]

Disposing of the residue produced as a by-product in the bisphenol A manufacturing process as industrial waste is not a good idea from the viewpoint of effective use of resources, and there are few suitable places for disposal, which increases processing costs and human rights costs. Therefore, effective use was desired.

An object of the present invention is to provide a method for effectively utilizing the residue produced as a by-product in the bisphenol A production process.

[Means for Solving the Problems]

The present inventors have finally completed the present invention as a result of intensive studies to solve the above problems.

That is, the present invention is characterized in that the residue by-produced in the bisphenol A production step is dissolved in by-product oil containing an aromatic hydrocarbon having 8 or more carbon atoms as a main component and used as a fuel. It is a processing method.

In the present invention, the residue by-produced in the bisphenol A production step is a residue (hereinafter referred to as a cleavage residue) by-produced in the step of decomposing a bisphenol A distillation residue or the like with a basic catalyst (cleavage step).

In the present invention, the by-product oil containing an aromatic hydrocarbon having 8 or more carbon atoms as a main component (hereinafter referred to as “by-product oil”) is a naphtha decomposition by-product produced as a by-product in a plant for decomposing naphtha to produce ethylene, propylene and the like. It is a by-product oil containing aromatic hydrocarbons such as raw oil as a main component, and an olefin containing C8 or more hydrocarbons as a main component. For example, styrene, allylbenzene, n-propylbenzene, m-ethyltoluene, p-
Ethyltoluene, α-methylstyrene, o-ethyltoluene, m-, p-methylstyrene, 1,2,4-trimethylbenzene, dicyclopentadiene, 1,2,3-trimethylbenze, indane, indene, naphthalene, etc. One or a mixture containing two or more kinds.

The ratio of dissolving the cleavage residue in the by-product oil varies depending on the dissolution temperature, but the cleavage residue / by-product oil is in the range of 0.20 to 0.5. When there are many cleavage residues, it takes a long time to dissolve and the viscosity also increases, so that a load is applied by the liquid feed pump and it becomes difficult to feed the liquid. The melting temperature is preferably in the range of 50 to 250 ° C. If it is less than 50 ° C, the dissolution rate becomes slow, the solubility becomes low, and the amount of the residue used becomes small. Although the temperature may exceed 250 ° C, it is necessary to heat it because the temperature is higher than the temperature of the cleavage step, which only increases the cost. It is preferable to dissolve the cleavage residue immediately after the by-product is produced in the cleavage step because the temperature of the cleavage residue is high, the cleavage residue is easily dissolved, and thermal energy can be effectively used.

A method of dissolving the cleavage residue in the by-product oil may be a method of dissolving the substance in a known solvent, and the obtained mixed melt is pumped to a boiler and used as fuel oil.

Even if the above-mentioned mixed melt is cooled to 0 ° C., there is no precipitation residue precipitation phenomenon, and the viscosity is slightly higher, and it takes time until the liquid is pumped to the boiler after melting, and the temperature of the mixed melt is Even if the value decreases, there is no possibility that a liquid feeding trouble will occur due to the precipitate.

〔Example〕

 One embodiment of the present invention will be described in more detail.

Embodiment 1 FIG. 1 is a flow chart showing an embodiment of the present invention.

400 kg / hr of by-product oil 2 at a temperature of 60 ° C in a dissolution tank 1 equipped with a stirrer
Was added, and the residue 3 produced as a by-product in the bisphenol A production process at a temperature of 150 to 200 ° C. was added at 100 kg / hr and stirred, and was fed as a fuel oil to the boiler via the pump 4. The average residence time in the dissolution tank 1 was 0.4 hours.

There were no problems in liquid transfer and no abnormality in the boiler.

〔The invention's effect〕

By using the residue produced as a by-product in the bisphenol A production process as a fuel by the method of the present invention, resources can be effectively used, the cost of industrial waste can be eliminated, and the residue can be evaluated as a fuel, which is advantageous to the industry. That is extremely large.

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of the present invention. The symbols in the figure are as follows. 1: Dissolution tank 2: By-product oil 3: Residue by-produced in the bisphenol A manufacturing process (cleavage residue) 4: Liquid transfer pump

Claims (1)

[Claims] 1. Treatment of a residue, characterized in that the residue by-produced in the bisphenol A production step is dissolved in a by-product oil containing an aromatic hydrocarbon having 8 or more carbon atoms as a main component and used as a fuel. Method.