METHOD OF RECYCLING ENERGY IN PROCESS OF BUTADIENE PREPARATION (As Amended)

• US 20160319704A1
• Filed: 07/02/2015
• Published: 11/03/2016
• Est. Priority Date: 07/02/2014
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: KIM, Mi Kyung, LEE, Jeong Seok, LEE, Jae Ik, KIM, Dae Hyeon, LEE, Jong Ku
• Granted Patent: US 10,066,514 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C07C 5/48 with oxygen as an acceptor
• CPC Class Codes: C07C 7/00 Purification; Separation; Use of additives working-up undefined gaseous mixtures obtained by cracking hydrocarbon oils C10G70/00
• CPC Class Codes: C07C 7/04 by distillation
• CPC Class Codes: F01D 15/10 Adaptations for driving, or combinations with, electric generators
• CPC Class Codes: F01D 25/08 Cooling of machines or engines in general F01P; Heating; Heat-insulation of blade-carrying members, of blades F01D5/00
• CPC Class Codes: F01K 25/14 using industrial or other waste gases
• CPC Class Codes: F01K 5/00 Plants characterised by use of means for storing steam in an alkali to increase steam pressure, e.g. of Honigmann or Koenemann type
• CPC Class Codes: F01K 7/16 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 Class Codes: F05D 2260/213 by the provision of a heat exchanger within the cooling circuit
• CPC Class Codes: H02N 11/00 Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means by hydrostatic pressure F03B17/04; by mechanical means F03G7/10; by dynamo-electric means, including arrangements of permanent magnets interacting with other permanent magnets, H02K53/00

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.

Claims

1. A method for recycling energy in process of butadiene preparation using oxidative dehydrogenation reaction, the method comprising steps of:

a) supplying part or all of 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) introducing the light gas, which is passed through the device unit equipped with the heat exchanger, into a reactor.

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.