Selective distillation apparatus and distillation method

Patent metadata

Field	Value
Publication number	US-10918968-B2
Application number	US-201716068041-A
Country	US
Kind code	B2
Filing date	Sep 6, 2017
Priority date	Sep 13, 2016
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

The present application relates to a selective distillation apparatus and a distillation method, which provides a distillation apparatus capable of switching between a serial connection mode and a parallel connection mode on the situation, thereby enabling selective operation of high-efficiency operation and high-capacity operation.

First claim

The invention claimed is:

1. A selective distillation apparatus comprising: a first distillation column equipped with a top reflux device and a bottom reboiler, wherein a top outlet and a bottom outlet are formed, an upper inlet and an upper outlet are formed and a lower inlet is formed; a second distillation column equipped with a top reflux device and a bottom reboiler, wherein a top outlet and a bottom outlet are formed and an upper inlet and a lower inlet are formed; a piping system and a control part,
wherein said piping system comprises: a first supply line capable of supplying a raw material to said first distillation column; a second supply line capable of supplying a raw material to said second distillation column; a first discharge line capable of discharging a top product or an upper product of said first distillation column; a second discharge line capable of discharging a top product of said second distillation column; a first connecting line connecting the bottom outlet of said first distillation column and the lower inlet of the second distillation column; a second connecting line connecting the bottom outlet of said first distillation column and the upper inlet of the second distillation column; a third connecting line connecting the top outlet of said second distillation column and the lower inlet of the first distillation column; and a fourth connecting line connecting the top outlet of said second distillation column and the upper inlet of the first distillation column, and
wherein said control part is configured to adjust at least one operating state of the reflux devices, the reboilers, the supply lines, the discharge lines, and the connecting lines to an activated or inactivated state,
wherein the control part is configured to inactivate the first supply line, the first connecting line, the bottom reboiler of the first distillation column and the top reflux device of the second distillation column when the raw material is supplied to the second supply line, or
wherein the control part is configured to inactivate the second connecting line and the third connecting line when the raw material is supplied to the first supply line, or
wherein the control part is configured to inactivate the second connecting line, the third connecting line and the bottom reboiler of the first distillation column when the raw material is supplied to the first supply line.

2. A distillation method of a raw material using the selective distillation apparatus of claim 1 , wherein the method comprises: a first step of controlling at least one of the reflux devices, the reboilers, the supply lines, the discharge lines and the connecting lines of said selective distillation apparatus in an activated or inactivated state; and
a second step of discharging products while maintaining the connection state of the first and second distillation columns in a serial connection or parallel connection state.

3. The distillation method according to claim 2 , wherein the first step comprises introducing the raw material into the second supply line in a state where the first supply line, the first connecting line, the bottom reboiler of the first distillation column and the top reflux device of the second distillation column are inactivated; and
wherein the second step comprises discharging products from the top or upper part of the first distillation column and the bottom of the second distillation column.

4. The distillation method according to claim 2 , wherein the first step comprises introducing the raw material into the first supply line in a state where the second connecting line and the third connecting line are inactivated; and
wherein the second step comprises discharging products from the top or upper part of the first distillation column and the second distillation column and the bottom of the second distillation column.

5. The distillation method according to claim 2 , wherein the first step comprises introducing the raw material into the first supply line in a state where the second connecting line, the third connecting line and the bottom reboiler of the first distillation column are inactivated; and introducing a part of the outflow stream of the top reflux device of the second distillation column into the first distillation column through the fourth connecting line; and
wherein the second step comprises discharging products from the top or upper part of the first distillation column and the second distillation column and the bottom of the second distillation column.

6. The distillation method according to claim 2 , wherein the product satisfies Equation 1 below
5° C.≤|BpH−BpL|≤65° C.,  [Equation 1]

wherein, BpH is a boiling point of a high-boiling substance, and BpL is a boiling point of a low-boiling substance.

7. The distillation method according to claim 6 , wherein said low-boiling substance is alkene and the high-boiling substance is alkane.

8. The distillation method according to claim 6 , wherein the low-boiling substance and the high-boiling substance have a purity of 99 wt % or more.

9. The distillation method according to claim 6 , wherein the method satisfies Equation 2 below:
P/Rd≥ 3700,  [Equation 2]

wherein P is a yield per hour (kg/hr) of the low-boiling substance and Rd is a heat quantity per hour (Gcal/hr) supplied to the bottom reboilers of the first and second distillation columns.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Tae Woo
• Lee Sung Kyu
• Kim Sung Kyun
• Shin Joon Ho
• Choo Yeon Uk

Classifications

• C10G35/02 Primary

  Thermal reforming · CPC title

• C10G2300/1044

  Heavy gasoline or naphtha having a boiling range of about 100 - 180 °C · CPC title

• C10G35/24

  Controlling or regulating of reforming operations · CPC title

• C07C7/04

  by distillation · CPC title

• B01D3/143 Primary

  by two or more of a fractionation, separation or rectification step · CPC title