# US 10,308,566 B1 · Method of separating normal butene using isomerization and process system for separating normal butene > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,308,566 B1 - Document ID: US10308566B1 - Status: Granted - Kind: B1 - Application number: 16/250,811 - Filed: 2019-01-17 - Published: 2019-05-23 - Granted: 2019-06-04 - Earliest claimed: 2015-05-13 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Dae Hyeon Kim; Soo Hwan Hwang; Jong Ku Lee; Jeong Seok Lee - Web page: https://patentgrep.com/patent/US10308566B1 ## CPC - C07C 5/2556: {with metals} - B01D 3/007: {Energy recuperation; Heat pumps} - B01D 3/009: {in combination with chemical reactions} - C07C 7/04: by distillation - Y02P 30/40: Ethylene production - C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract Provided are a separation system for easily recovering normal butene from an olefin fraction including isobutene, isobutane, 1-butene, 2-butene, and normal butane, and a separation process system using the method. Since the separation system may easily convert 1-butene included in the olefin fraction to 2-butene, normal butene may be effectively separated and recovered by factional distillation and each recovered fraction may be easily refluxed even if the use of a reflux system using a refrigerant is reduced or excluded. Thus, economic efficiency may be improved and simultaneously, separation efficiency may be increased. ## Claims ### Claim 1 A separation system for recovering normal butene from an olefin fraction, the separation system comprising: a supply unit that supplies a reactant including an olefin fraction; a processing unit connected to the supply unit, in which a single distillation column is disposed, the distillation column including: at least one isomerization reaction zone; at least one distillation zone; an overhead discharge line; and a bottom discharge line; and a recovery unit that is connected to the processing unit and recovers a reaction product, the recovery unit comprising a heat exchanger, a top fraction recovery unit connected to the overhead discharge line of the distillation column to recover a top fraction, and a bottom fraction recovery unit connected to the bottom discharge line of the distillation column to recover a bottom fraction, the heat exchanger refluxing each of the top fraction and the bottom fraction without the use of a separate reflux system comprising a condenser and reboiler. ### Claim 2 (depends on 1) The separation system of claim 1, wherein the supply unit comprises a supply line which transfers the reactant to the processing unit, and the supply line is connected to a stream in which a C4 residue is recovered from naphtha cracking. ### Claim 3 (depends on 1) The separation system of claim 1, wherein the supply unit further comprises a hydrogen supply line that supplies hydrogen to the processing unit. ### Claim 4 (depends on 1) The separation system of claim 1, wherein the isomerization reaction zone is located in top 5% to 50% of a total height of the distillation column. ### Claim 5 (depends on 1) The separation system of claim 1, wherein the top fraction recovery unit comprises a first reflux line that reintroduces at least a portion of the top fraction into the processing unit, and the bottom fraction recovery unit comprises a second reflux line that reintroduces at least a portion of the bottom fraction into the processing unit. ### Claim 6 (depends on 5) The separation system of claim 5, wherein: the recovery unit further comprises a compressor and a reflux drum; the first reflux line is sequentially connected to the compressor, the heat exchanger, the reflux drum, and the processing unit, and the second reflux line is sequentially connected to the heat exchanger and the processing unit. ### Claim 7 (depends on 6) The separation system of claim 6, wherein: the compressor compresses at least a portion of the top fraction to yield a compressed top fraction; and the heat exchanger performs heat exchange between at least a portion of the compressed top fraction transferred through the first reflux line and at least a portion of the bottom fraction transferred through the second reflux line, refluxing each of the top fraction and the bottom fraction without the use of a separate reflux system comprising a condenser and reboiler.