Continuous process for preparing poly(butylene terephthalate) ol

Details Continuous process for preparing poly(butylene terephthalate) ol Continuous process for preparing poly(butylene terephthalate) ol

1990-08-01

1991-11-12

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528279, C08G 6302

Patent

active

050649353

ABSTRACT:
Economic and efficient process for preparing an oligomer of poly(butylene terephthalate) or an oligomer of poly(butylene isophthalate) from a transesterification reaction mass by using a countercurrent column reactor system wherein the transesterification reaction mass is fed into the countercurrent column reactor and continuously flows downward while simultaneously a heated inert gas stream continuously flows upward to scrub out volatiles from the transesterification reaction mass, thereby yielding from the bottom of the countercurrent column reactor an oligomer of poly(butylene terephthalate) or an oligomer of poly(butylene isophthalate) suitable for use in a polycondensation reaction. Butanediol is recycled throughout the process through an absorber column.

REFERENCES:
patent: 4289871 (1981-09-01), Rowan et al.
patent: 4289895 (1981-09-01), Burkhardt et al.
patent: 4499261 (1985-02-01), Heinze et al.

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