Method for decomposing phenolic by-product

Patent metadata

Field	Value
Publication number	US-11939282-B2
Application number	US-202017413790-A
Country	US
Kind code	B2
Filing date	Aug 11, 2020
Priority date	Sep 16, 2019
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

The present disclosure provides a method for decomposing a phenolic by-product, the method including: a step S10 of injecting and mixing a bisphenol A by-product produced in a bisphenol A production process, a mixed by-product stream of phenol by-products produced in a phenol production process, a decomposition apparatus side discharge stream, and a process water stream in a mixing apparatus; a step S20 of injecting a mixing apparatus discharge stream discharged from the mixing apparatus into a phase separation apparatus and phase-separating the mixing apparatus discharge stream into an oil-phase stream and a liquid-phase stream; a step S30 of feeding the oil-phase stream, which is phase-separated in the step S20 and discharged from the phase separation apparatus, to a decomposition apparatus to decompose the oil-phase stream; and a step S40 of circulating the decomposition apparatus side discharge stream obtained by the decomposition in the step S30 to the mixing apparatus in the step S10.

First claim

The invention claimed is:

1. A method of decomposing a phenolic by-product, the method comprising:
a step S10 of injecting and mixing a mixed by-product stream of bisphenol A by-product produced in a bisphenol A production process and a phenol by-product produced in a phenol production process, a decomposition apparatus side discharge stream, and a process water stream in a mixing apparatus;
a step S20 of injecting a mixing apparatus discharge stream discharged from the mixing apparatus into a phase separation apparatus and phase-separating the mixing apparatus discharge stream into an oil-phase stream and a liquid-phase aqueous solution stream;
a step S30 of feeding the oil-phase stream, which is phase-separated in the step S20 and discharged from the phase separation apparatus, to a decomposition apparatus to decompose the oil-phase stream; and
a step S40of circulating the decomposition apparatus side discharge stream obtained by the decomposition in the step S30 to the mixing apparatus in the step S10.

2. The method of claim 1 , wherein the mixed by- product stream includes one or more selected from the group consisting of bisphenol A, phenol, alpha-methyl styrene, acetophenone, cumylphenol, and alpha-methyl styrene dimer.

3. The method of claim 1 , wherein the decomposition apparatus side discharge stream includes one or more selected from the group consisting of phenol, acetophenone, isopropyl phenol, alpha-methyl styrene, and cumene.

4. The method of claim 1 , wherein the decomposition apparatus side discharge stream comprises acetophenone in an amount of 20 wt % or more.

5. The method of claim 1 , wherein a pH of the process water is 3.5 to 7.

6. The method of claim 1 , wherein the process water stream includes a process water derived from the liquid-phase aqueous solution stream, which is phase-separated in the step S20.

7. The method of claim 1 , wherein a decomposition apparatus top discharge stream obtained by the decomposition in the step S30 includes one or more selected from the group consisting of phenol, alpha-methyl styrene, and cumene.

8. The method of claim 1 , wherein in the step S10, a flow rate ratio of the mixed by-product stream to the decomposition apparatus side discharge stream is 0.8 to 1.2:0.1 to 0.4.

9. The method of claim 1 , wherein in the step S10, a flow rate ratio between the mixed by-product stream, the decomposition apparatus side discharge stream, and the process water stream is 0.8 to 1.2:0.1 to 0.4:0.8 to 1.5.

10. The method of claim 1 , wherein in the step S20, the phase-separation is performed for 1 hour to 10 hours.

Assignees

• Lg Chemical Ltd

Inventors

• Kang Min Suk
• Lee Sang Beom
• Shin Joon Ho

Classifications

• C07C37/76 Primary

  by steam distillation · CPC title

• B01D17/02

  Separation of non-miscible liquids · CPC title

• C07C37/005 Primary

  by obtaining phenols from products, waste products or side-products of processes, not directed to the production of phenols, by conversion or working-up · CPC title

• C07C37/72

  by liquid-liquid treatment · CPC title

• B01D2257/70

  Organic compounds not provided for in groups B01D2257/00 - B01D2257/602 · CPC title