Energy-Saving Process Intensification of an Oil Refinery Distillation Plant by an Internal Heat Integration Mthod
Special Symposium - EPIC-1: European Process Intensification Conference - 1
EPIC-1: Intensified Plants & Process Integration (IPPI)
Keywords: Multi-component Distillation, Heat Integration, Energy Saving, Process Intensification
Authours:
Kunio Kataoka*, Hideo Noda, Tadahiro Mukaida, Mampei Kaneda, Hiroshi Yamaji, Kimpei Horiuchi1)and Masaru Nakaiwa2)
Affiliation, Address and E-mail:
Kansai Chemical Engineering Co., Ltd
2-9-7 Minaminanamatsu-cho, Amagasaki-city, Hyogo 660-0053, Japan, E-mail:kataoka@kce.co.jp
1) Maruzen Petrochemical Co., Ltd
3 Goi Minami-kaigan, Ichihara 290-8503, Japan, E-mail:kinpei-horiuchi@chemiway.co.jp
2) National Institute of Advanced Industrial Science and Technology
Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan, E-mail:Nakaiwa-m@aist.go.jp
This paper will report a possibility of energy-saving process intensification by a heat integration method accompanied with internal heat exchange within an oil refinery distillation process. An existing C5 splitter distillation plant consisting of three columns connected in series is operated to extract pure cyclopentane as the intermediate key component from a 12 components hydrocarbon mixture obtained by naphtha cracking. As the first phase for this purpose, a pilot plant was successfully constructed in 2005 in place of the first column of the existing plant.
The purpose of the present study proceeding as the national project for prevention against global warming is how to make a total system design of energy-saving distillation plants from a viewpoint of energy-saving process intensification. A process simulation analysis was made to design a new heat integrated distillation plant consisting of two new-type of distillation columns (named HIDiC 1&2) by keeping the specifications of separation of the existing plant. Each HIDiC column has a double-tube column structure for internal heat integration: internal heat exchange is realized between the inner tube serving as the rectifying section and the outer annular tube serving as the stripping section. A compressor was installed to compress the vapor from the top of the low (normal) -pressure HIDiC 1 stripping section into the bottom of the high-pressure HIDiC 1 rectifying section. As a result, the heat transfer occurring inside the HIDiC 1 from the high-boiling-point rectifying section to the low-boiling-point stripping section can give a great reduction of the heat duty of the HIDiC 1 reboiler. In a similar manner, the second HIDiC column, i.e. HIDiC 2 can greatly reduce the heat duty of its reboiler without another compressor if the top vapor of the HIDiC 1 rectifying section is compressed into the bottom of the HIDiC 2 rectifying section.
This simulation analysis made for the proposed HIDiC system has suggested a great energy saving more than 50% of the energy consumption of the existing plant without installing another compressor for the HIDiC 2.
See the full pdf manuscript of the abstract.
Presented Wednesday 19, 15:00 to 15:20, in session EPIC-1: Intensified Plants & Process Integration (IPPI).
