阅读说明：本技术 分解酚类副产物的方法和设备 (Method and apparatus for decomposing phenolic by-products ) 是由 姜旻皙 李相范 申俊浩 于 2019-10-15 设计创作，主要内容包括：本发明涉及一种分解酚类副产物的方法和设备,该分解方法包括以下步骤：(S10)：将酚类副产物进料到多级反应蒸馏塔；(S20)：通过多级反应蒸馏塔将酚类副产物分离为包含活性成分的上部排出流、包含苯乙酮的侧部排出流和包含焦油的下部排出流；以及(S30)：将从多级反应蒸馏塔排出的侧部排出流与从多级反应蒸馏塔排出的下部排出流混合以形成混合排出流。(The invention relates to a method and equipment for decomposing phenolic byproducts, wherein the decomposition method comprises the following steps: (S10): feeding the phenolic by-product to a multi-stage reactive distillation column; (S20): separating the phenolic by-product by a multi-stage reactive distillation column into an upper effluent stream comprising the active ingredient, a side effluent stream comprising acetophenone and a lower effluent stream comprising tar; and (S30): the side effluent stream discharged from the multistage reactive distillation column is mixed with the lower effluent stream discharged from the multistage reactive distillation column to form a mixed effluent stream.)

1. A method of decomposing phenolic byproducts produced in a bisphenol a production process, the method comprising:

Step (S10): feeding the phenolic by-product to a multi-stage reactive distillation column;

step (S20): separating the phenolic by-product by the multi-stage reactive distillation column into an upper effluent stream comprising the active ingredient, a side effluent stream comprising acetophenone, and a bottom effluent stream comprising tar; and

step (S30): mixing the side effluent stream discharged from the multi-stage reactive distillation column with the bottom effluent stream discharged from the multi-stage reactive distillation column to form a mixed effluent stream.

2. The process of claim 1, wherein the phenolic byproduct is heat exchanged with the mixed effluent stream by a heat exchanger and fed into the multi-stage reactive distillation column.

3. The method of claim 1, wherein the side discharge flow comprises: more than 99 wt% of acetophenone contained in the phenolic by-product.

4. The process according to claim 1, wherein the side exit stream is withdrawn through a side outlet disposed at a stage within 50% to 90% of the total number of stages of the multi-stage reactive distillation column from the top.

5. The method of claim 1, wherein the viscosity of the mixed effluent stream is lower than the viscosity of the bottom effluent stream.

6. The process according to claim 1, wherein the operating pressure of the multistage reactive distillation column is from 0.1 bar to 3.0 bar.

7. An apparatus for decomposing phenolic by-products produced in a bisphenol a production process, said apparatus comprising: a multi-stage reactive distillation column that separates the phenolic by-product into an upper effluent stream comprising an active ingredient, a side effluent stream comprising acetophenone, and a bottom effluent stream comprising tar; and

a mobile line system, the mobile line system comprising: a side exhaust stream movement line through which the side exhaust stream is exhausted and moved; and a bottom effluent stream movement line through which the bottom effluent stream is discharged and moved,

wherein the side effluent stream movement line and the bottom effluent stream movement line are connected to each other such that the side effluent streams and the bottom effluent stream merge with each other to form a mixed effluent stream.

8. The apparatus of claim 7, wherein a side outlet is provided at a stage within 50% to 90% of the total number of stages of the multi-stage reactive distillation column from the top, through which the side effluent stream is discharged.

9. The apparatus of claim 7, wherein an upper outlet is provided at an upper portion of the multi-stage reactive distillation column through which the upper effluent stream is discharged.

10. The apparatus of claim 7, further comprising a heat exchanger that exchanges heat between the phenolic byproduct and the mixed effluent stream.

Technical Field

Cross Reference to Related Applications

This application claims the benefit of priority from korean patent application No.10-2018-0166578, filed on 20.12.2018, the entire contents of which are incorporated herein by reference.

Background

Bisphenol a is produced by conducting a condensation reaction of phenol and acetone in the presence of an acid catalyst, followed by separation and purification procedures. A phenolic byproduct is generated in the process of preparing such bisphenol a and contains an active ingredient such as phenol, cumene or α -methylstyrene, and thus a phenolic byproduct decomposition process for recovering the active ingredient has been performed. The decomposition process is performed using a decomposition apparatus in which a reactor and a distillation column are separated from each other or integrated with each other. This will be described below with reference to the drawings.

Fig. 3 shows a decomposition process performed by a decomposition apparatus in which the reactor 100 and the distillation column 200 are separated, by-products added to the reactor 100 are thermally cracked, tar contained in the by-products is discharged through the bottom of the reactor 100, and residual components are discharged through the upper portion of the reactor 100 and added to the distillation column 200. Next, reduced pressure distillation is performed in the distillation column 200, acetophenone and residual by-products are discharged through the bottom of the distillation column 200, and the active ingredient and light components are discharged through the upper portion of the distillation column 200, thereby recovering the active ingredient. This decomposition process can improve the recovery rate of the active ingredient, but since the decomposition step and the vacuum distillation step are separately performed, there are problems that a space for installing equipment is required and the consumption rate of heat energy is high.

Unlike the decomposition process shown in fig. 3, fig. 4 shows a decomposition process performed by a decomposition apparatus including a reactor 300 integrated with a distillation column, the byproduct added to the reactor 300 is thermally cracked and pressure-distilled, tar, acetophenone, and residual byproducts contained in the byproduct are discharged through the bottom of the reactor 300, and active components and light components are discharged through the upper portion of the reactor 300, thereby recovering the active components. Such decomposition process can reduce the installation space of the equipment and can reduce the consumption rate of heat energy, but has a problem in that a polymerization phenomenon of the active ingredient (for example, dimerization reaction or polymerization reaction of α -methylstyrene) occurs in the pressure distillation process, thereby reducing the recovery rate of the active ingredient.

Therefore, there is a need for a decomposition process and a decomposition apparatus capable of efficiently recovering an active ingredient from a phenolic by-product produced in a bisphenol a production process.

Disclosure of Invention

Technical problem

In order to solve the problems mentioned in the background art, it is an object of the present invention to provide a decomposition method and a decomposition apparatus of a phenolic by-product capable of reducing the rate of consumption of heat energy in the decomposition process and increasing the recovery rate of an active ingredient by improving the decomposition process of a phenolic by-product generated in a process for producing bisphenol A.

Technical scheme

In one general aspect, there is provided a method of decomposing phenolic by-products produced in a bisphenol a production process, the method comprising: step (S10): feeding the phenolic by-product to a multi-stage reactive distillation column; step (S20): separating the phenolic by-product by a multi-stage reactive distillation column into an upper effluent stream comprising the active ingredient, a side effluent stream comprising acetophenone, and a bottom effluent stream comprising tar; and a step (S30): the side effluent stream discharged from the multistage reactive distillation column is mixed with the bottom effluent stream discharged from the multistage reactive distillation column to form a mixed effluent stream.

In another aspect, there is provided an apparatus for decomposing phenolic by-products produced in a process for producing bisphenol a, the apparatus comprising: a multi-stage reactive distillation column that separates the phenolic by-product into an upper effluent stream comprising the active ingredient, a side effluent stream comprising acetophenone, and a bottom effluent stream comprising tar; and a moving line (moving line) system, the moving line system including: a side exhaust stream movement line through which the side exhaust stream is exhausted and moved; and a bottom effluent stream moving line through which the bottom effluent stream is discharged and moved, wherein the side effluent stream moving line and the bottom effluent stream moving line are connected to each other such that the side effluent stream and the bottom effluent stream merge with each other to form a mixed effluent stream.

Advantageous effects

According to the present invention, the operation of the multistage reactive distillation column is performed in the normal pressure range, so that the polymerization phenomenon of the active ingredient can be prevented, thereby improving the recovery rate of the active ingredient.

In addition, according to the present invention, by mixing the side discharge flow with the bottom discharge flow containing tar and having a high viscosity, the viscosity of the bottom discharge flow is reduced, so that the mobility and storability of tar contained in the bottom discharge flow can be increased.

In addition, according to the present invention, heat exchange is performed between the mixed effluent stream and the phenolic by-product, and the mixed effluent stream is obtained by mixing the side effluent stream and the bottom effluent stream, so that the rate of consumption of heat energy in the phenolic by-product decomposition process can be reduced.

Drawings

Fig. 1 is a reference diagram for describing a method and apparatus for decomposing a phenolic byproduct according to an exemplary embodiment of the present invention.

Fig. 2 is a reference diagram for describing a method and apparatus for decomposing a phenolic byproduct according to another exemplary embodiment of the present invention.

FIG. 3 is a reference diagram for describing a method and apparatus for decomposing a phenolic byproduct according to comparative example 1 of the present invention.

Fig. 4 is a reference diagram for describing a method and apparatus for decomposing a phenolic byproduct according to comparative example 2 of the present invention.

Fig. 5 is a reference diagram for describing a method and apparatus for decomposing a phenolic byproduct according to comparative example 3 of the present invention.

Detailed Description