Abstract：
:Continuous esterification of free fatty acids (FFA) from acidified oil with methanol was carried out with NKC-9 cation-exchange resin in a fixed bed reactor with an internal diameter of 25 mm and a height of 450 mm to produce biodiesel. The results showed that the FFA conversion increased with increases in methanol/oil mass ratio, reaction temperature and catalyst bed height, whereas decreased with increases in initial water content in feedstock and feed flow rate. The FFA conversion kept over 98.0% during 500 h of continuous esterification processes under 2.8:1 methanol to oleic acid mass ratio, 44.0 cm catalyst bed height, 0.62 ml/min feed flow rate and 65°C reaction temperature, showing a much high conversion and operational stability. Furthermore, the loss of sulfonic acid groups from NKC-9 resin into the production was not found during continuous esterification. In sum, NKC-9 resin shows the potential commercial applications to esterification of FFA.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Feng Y,Zhang A,Li J,He Bdoi
10.1016/j.biortech.2010.10.115subject
Has Abstractpub_date
2011-02-01 00:00:00pages
3607-9issue
3eissn
0960-8524issn
1873-2976pii
S0960-8524(10)01771-2journal_volume
102pub_type
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