Method of recycling energy in process of butadiene preparation

Patent metadata

Field	Value
Publication number	US-10066514-B2
Application number	US-201515108519-A
Country	US
Kind code	B2
Filing date	Jul 2, 2015
Priority date	Jul 2, 2014
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

Provided is a method for recycling energy in process of butadiene preparation, which includes, in the process of preparing butadiene using oxidative dehydrogenation reaction, steps of: a) supplying part or all of a light gas discharged from a solvent absorption tower to a turbine to produce electricity; b) passing the light gas passed through the turbine through one or more device units provided with a heat exchanger; and c) feeding the light gas passed through the device units provided with the heat exchanger into a reactor, according to which more economical butadiene preparation process is provided, by reducing net energy value required in process of butadiene preparation using oxidative dehydrogenation reaction.

First claim

What is claimed is:

1. A method for recycling energy in a process of butadiene preparation using oxidative dehydrogenation reaction, the method comprising steps of:
a) supplying a part or all of a light gas discharged from a solvent absorption tower to a turbine to produce electricity;
b) passing the light gas passed through the turbine to one or more device units equipped with a heat exchanger; and
c) circulating the light gas that has passed through the device unit equipped with the heat exchanger back into an oxidative dehydrogenation reactor,
wherein a temperature of the light gas discharged from the turbine ranges from −50° C. to 20° C.

2. The method of claim 1 , wherein a pressure of the light gas supplied to the turbine ranges from 5 to 20 KCG.

3. The method of claim 1 , wherein a pressure of the light gas discharged from the turbine ranges from 1 to 5 KCG.

4. The method of claim 1 , wherein a temperature of the light gas supplied to the turbine ranges from 5 to 50° C.

5. The method of claim 1 , wherein a temperature of the light gas discharged from the turbine ranges from −50 to 0° C.

6. The method of claim 1 , wherein the turbine provides electricity yield ranging from 1 to 200 kWh/BD ton.

7. The method of claim 1 , wherein the heat exchanger is a multistage heat exchanger in which one or more same type of heat exchangers are connected in sequence.

8. The method of claim 1 , wherein the device unit is selected from a heat exchanger and a solvent streamline equipped with a heat exchanger.

9. The method of claim 8 , wherein the device unit is a heat exchanger, and produces a refrigerant ranging from −10 to 30° C. in temperature from the heat exchanger.

10. The method of claim 8 , wherein the device unit is a solvent streamline equipped with a heat exchanger, and the temperature of a solvent stream in the solvent streamline ranges from 5 to 50° C.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Mi Kyung
• Lee Jeong Seok
• Lee Jae Ik
• Kim Dae Hyeon
• Lee Jong Ku

Classifications

• F01K25/14 Primary

  using industrial or other waste gases · CPC title

• F01K7/16

  the engines being only of turbine type (the engines using steam of critical or overcritical pressure F01K7/32; the engines being of extraction or non-condensing type F01K7/34) · CPC title

• C07C7/00 Primary

  Purification; Separation; Use of additives (working-up undefined gaseous mixtures obtained by cracking hydrocarbon oils C10G70/00) · CPC title

• F01D25/08

  Cooling (of machines or engines in general F01P); Heating; Heat-insulation (of blade-carrying members, of blades F01D5/00) · CPC title

• F01D15/10

  Adaptations for driving, or combinations with, electric generators · CPC title