PURIFICATION OF BUTADIENE OR ISOPRENE

• Main Authors: ARAKAWA MASATOSHI, ONIZUKA KENJI, YOSHIOKA MASAO
• Format: Patent
• Language: English
• Published: 13.05.1983
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC CHEMISTRY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

PURPOSE:In recovering the titled high-purity substance from a mixture of 4-5C hydrocarbons by two-step extractive distillation, to use quantity of heat effectively, by feeding a side flow taken out from a solvent stripper to a heat recovery process, returning it to a plate near to the plate from which the side flow is taken out. CONSTITUTION:A raw material hydrocarbon is fed from the pipe 1 to the first extractive distillation column EI, a selective solvent is fed from the pipe 3 to it to carry out extractive distillation, and a flow comprising diolefins, acetylenes, and the solvent is fed from the bottom of the column to the first solvent stripper column SI. The solvent is circulated from the bottom of the clumn to the first extractive distillation column EI, and a flow of hydrocarbon is sent from the top of the column to the second extractive distillation column EII. The desired substance is obtained from the pipe 10, a flow comprising the acetylenes and the solvent is sent from the bottom of the column to the second solvent stripper column SII, and the acetylenes are discharged from the pipe 13. A side flow is taken out from the pipe 14, subjected to heat exchange with a substance to be heated by the heat exchanger 15, and condensed and returned again to the stripper column SII.