Process for the continuous, counter flow/direct flow extraction

Details Process for the continuous, counter flow/direct flow extraction Process for the continuous, counter flow/direct flow extraction

1988-09-19

1990-12-18

Anderson, Harold D.

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

Synthetic resins

Treating polymer containing material or treating a solid...

422129, 528323, 528495, 528496, C08G 6946

Patent

active

049787438

ABSTRACT:
This invention relates to a process for the continuous extraction of polyamides, in which the residue of low molecular weight components left in the polyamide is very small. It also relates to a two-part extraction tube suitable for this purpose, in which the upper part is connected to the lower part by a transition tube of smaller diameter and a counterflow extraction is carried out in the upper part and a direct flow extraction in the lower part under particular conditions.

REFERENCES:
patent: 3905946 (1975-09-01), Nieswandt et al.

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