Method for producing monodisperse, amido-methylated vinyl-aromatic bead polymers

Patent metadata

Field	Value
Publication number	US-9834653-B2
Application number	US-201414906308-A
Country	US
Kind code	B2
Filing date	Aug 8, 2014
Priority date	Aug 9, 2013
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

The invention relates to a method of producing monodisperse amidomethylated vinylaromatic bead polymers, to ion exchangers prepared from these monodisperse amidomethylated vinylaromatic bead polymers by alkaline hydrolysis, to the method of using said monodisperse amidomethylated vinylaromatic bead polymers in the manufacture of ion exchangers and chelating resins, and also to the method of using these ion exchangers in the removal of heavy metals and noble metals from aqueous solutions or gases.

First claim

What is claimed is:

1. A one-pot method for producing monodisperse amidomethylated vinylaromatic bead poiymers, the method comprising contacting:
at least one monodisperse vinylaromatic bead polymer;
at least one compound of formula (I) or salts thereof

where
R 1 =—CH(C 1 -C 6 -alkyl)- or —CH 2 —, and R 2 =—CH—(C 1 -C 6 -alkyl)- or —CH 2 —, or
R 1 and R 2 combine to form a C 6 -C 14 -arylene, or
R 1 and R 2 together represent —CH═CH—; and

at least one condensed formaldehyde, wherein the at least one condensed formaldehyde comprises paraformaldehyde, or trioxane, or mixtures thereof, together in a one-pot process in the presence of at least one protic add and at least one organic solvent at a temperature of 55° C. to 75° C. to produce monodisperse amidomethylated vinylaromatic bead polymers.

2. The method as claimed in claim 1 , wherein the temperature is 62° C. to 68° C.

3. The method as claimed in claim 1 , wherein the at least one protic acid comprises sulfuric acid, hydrochloric acid, oleum, or mixtures thereof.

4. The method as claimed in claim 1 , wherein the at least one organic solvent comprises chlorinated aliphatic hydrocarbons.

5. The method as claimed in claim 4 , wherein the ratio of solvent to compound of formula (I) is 5.5:1 to 8.5:1.

6. The method as claimed in claim 1 , wherein the at least one organic solvent comprises chlorinated C 1 -C 6 -alkanes.

7. The method of claim 1 , wherein R 1 and R 2 together form phenylene, optionally substituted by C 1 -C 4 -alkyl.

8. The method of claim 1 , wherein the compounds of formula (I) are phthalimide, succinimide or maleimide.

9. The method of claim 1 , wherein the compounds of formula (I) are phthalimide.

10. The method as claimed in claim 1 , wherein:
the temperature is 62° C. to 68° C.;
the compounds of formula (I) are phthalimide, succinimide or maleimide;
the at least one protic acid is sulfuric acid, hydrochloric acid, oleum, or mixtures thereof;
the at least one organic solvent is a chlorinated C 1 -C 6 -alkene;
a ratio of the at least one organic solvent to the compounds of formula (I) is 5.5:1 to 8.5:1; and
the at least one condensed formaldehyde is paraformaldehyde, trioxane, or mixtures thereof.

11. A monodisperse amidomethylated vinylaromatic bead polymer produced by the process of claim 1 .

Assignees

• Lanxess Deutschland Gmbh

Inventors

• Klipper Reinhold
• Zarges Wolfgang
• Halle Olaf
• Schelhaas Michael

Classifications

• C02F2001/425

  using cation exchangers · CPC title

• C02F2001/422

  using anionic exchangers · CPC title

• C02F1/42

  by ion-exchange (ion-exchange in general B01J) · CPC title

• B01J45/00

  Ion-exchange in which a complex or a chelate is formed; Use of material as complex or chelate forming ion-exchangers; Treatment of material for improving the complex or chelate forming ion-exchange properties (ion-exchange chromatography processes B01D15/36) · CPC title

• B01J41/14

  obtained by reactions only involving unsaturated carbon-to-carbon bonds · CPC title