Diester-based material production unit and diester-based material production system including the same

Patent metadata

Field	Value
Publication number	US-12290769-B2
Application number	US-202017603859-A
Country	US
Kind code	B2
Filing date	Jul 2, 2020
Priority date	Jul 4, 2019
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

The present disclosure relates to a diester-based material production unit including a reaction device in which an esterification reaction of dicarboxylic acid and a primary alcohol is performed, a column in which the gas-liquid separation of the primary alcohol and the water introduced is performed, a heat exchanger installed on a gas phase line of the column to remove heat of the gas phase line, a flash drum in which separation of a liquid phase and a gas phase is performed in the mixture stream including the primary alcohol and the water, a condenser installed on the flash drum upper line, and a layer separator in which the layer separation of a mixture of a liquefied primary alcohol and water into an organic layer and an aqueous layer is performed, wherein one or more lines through which recirculated primary alcohol from the flash drum and the layer separator flows are connected to an upper portion of the column. According to the present invention, a coolant usage amount can be reduced and a rheological problem can be eliminated since a liquid phase and a gas phase coexist in a pipe.

First claim

The invention claimed is:

1. A diester-based material production unit comprising:
a reaction device including a reaction vessel in which an esterification reaction of dicarboxylic acid and a primary alcohol is performed and a gas phase discharge line installed at an upper end of the reaction vessel such that vaporized primary alcohol and water are discharged to a column therethrough;
the column including a column main body in which the gas-liquid separation of the primary alcohol and the water introduced from the gas phase discharge line is performed, a liquid phase line installed at a lower portion of the column main body such that a liquefied alcohol-rich stream flows into the reaction device, and a gas phase line installed at an upper portion of the column main body and connected to a side portion of a flash drum such that a mixture stream of a gas-phase primary alcohol and water flows out;
a heat exchanger installed on the gas phase line of the column and removing heat of the gas phase line;
the flash drum including a flash drum main body in which separation of a liquid phase and a gas phase is performed in a mixture stream including the primary alcohol and the water, a flash drum lower line from which the liquid phase including a liquefied primary alcohol is discharged, and a flash drum upper line installed to discharge the mixture stream of the gasphase primary alcohol and the water to a layer separator;
a condenser installed on the flash drum upper line to liquefy the mixture stream of the gas-phase primary alcohol and the water in the flash drum upper line; and
the layer separator including a separation tank in which a layer separation of a mixture of the liquefied primary alcohol and the water into an organic layer and an aqueous layer is performed, an organic layer line through which the separated organic layer is discharged, and an aqueous layer line through which the separated aqueous layer is discharged, wherein:
the flash drum lower line is connected to one or more positions selected from the group consisting of a column main body side upper portion, a column main body side lower portion, and the reaction vessel;
the organic layer line is connected to one or more positions selected from the group consisting of a flash drum main body side portion, the column main body side upper portion, the column main body side lower portion and the reaction vessel; and
at least one of the flash drum lower line and the organic layer line is connected to the column main body side upper portion.

2. The diester-based material production unit of claim 1 , wherein the flash drum lower line is connected to the column main body side upper portion.

3. The diester-based material production unit of claim 1 , wherein the organic layer line is connected to the flash drum main body side portion or to the column main body side upper portion.

4. The diester-based material production unit of claim 1 , wherein the flash drum lower line is connected to the column main body side upper portion, and the organic layer line is connected to the flash drum main body side portion.

5. The diester-based material production unit of claim 1 , wherein the dicarboxylic acid comprises one or more selected from the group consisting of terephthalic acid, phthalic acid, isophthalic acid, and cyclohexane dicarboxylic acid.

6. The diester-based material production unit of claim 1 , wherein the primary alcohol has 3 to 10 carbon atoms.

7. The diester-based material production unit of claim 1 , wherein the esterification reaction is performed at a temperature of 150° C. to 230° C.

8. The diester-based material production unit of claim 1 , wherein the temperature of a stream in the gas phase line of the column is 130° C. to 180° C.

9. A diester-based material production system comprising:
a reaction part in which two or more of the diester-based material production units of claim 1 are connected in series; and
a purification unit which purifies a reaction product discharged from the reaction part.

10. The diester-based material production system of claim 9 , wherein in the reaction part, 3 to 6 production units are connected in series.

Assignees

• Lg Chemical Ltd

Inventors

• Jeong Jae Hun
• Lee Sung Kyu
• Choo Yeon Uk
• Jun Hyoung
• Kim Hyun Kyu
• Jin Chan Hyu
• Park Jin Sung

Classifications

• B01D53/00

  Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols, (recovery of volatile solvents by condensation B01D5/00; sublimation B01D7/00; cold traps, cold baffles B01D8/00; working-up undefined gaseous mixtures obtained by cracking hydrocarbon oils C10G70/00; cleaning coal gas C10K; working-up of natural gas, or synthetic natural gas, C10L3/10; separation of difficult-to-condense gases or air by liquefaction F25J; for investigating materials G01N30/00) · CPC title

• C07C67/52

  by change in the physical state, e.g. crystallisation · CPC title

• C07C67/08 Primary

  by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds · CPC title

• B01D3/06

  Flash distillation · CPC title

• B01D3/009

  in combination with chemical reactions · CPC title