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1. You are using a numeric comparision operator (-eq) to compare strings.
2. Why don't you test for inequality instead of equality?
3. You are missing whitespace between your test arguments and...

I'm not sure why it's saying "then" is unexpected. Maybe because you forgot to quote ${i} -- if it's blank for some reason, that becomes [ -e ] instead of [ -e "" ] which is syntactically wrong.
...

Change teh "TEMP" assignment to:
TEMP=$(echo "${i}" | sed -e "s/$PREMID_DT_TM/$POSTMID_DT_TM/")