# US 4,393,175 A · Process for the continuous diazotization of water-soluble polymeric amines

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- Number: US 4,393,175 A
- Document ID: US4393175A
- Status: Granted
- Kind: A
- Application number: 06/300,621
- Filed: 1981-09-09
- Granted: 1983-07-12
- Earliest claimed: 1981-09-09
- Assignees: Dynapol
- Inventors: Phillip J. Brock; Daniel J. Dawson
- Web page: https://patentgrep.com/patent/US4393175A

## CPC

- C08F 8/34: Introducing sulfur atoms or sulfur-containing groups
- C08F 8/30: Introducing nitrogen atoms or nitrogen-containing groups
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

An improvement in the diazotization of polymeric amines is disclosed that minimizes crosslinking problems. Solutions of nitrite ion and polymeric amine are concurrently continuously fed at controlled rates to a turbulently agitated limited volume mixing zone.

## Claims

### Claim 1

In a process of diazotizing a polymeric aromatic amine wherein a solution of the polymeric amine is admixed with a solution of nitrite ion, the improvement comprising continuously feeding said solutions to a turbulent reaction zone at a combined liquid flow rate of not less than one reaction zone volume per minute and continuously withdrawing the resulting reaction product to maintain the reaction zone liquid volume.

### Claim 2 (depends on 1)

The process of claim 1 wherein said combined liquid flow is at a rate of not less than 1.2 reaction zone volumes per minute.

### Claim 3 (depends on 1)

The process of claim 1 wherein said turbulent reaction zone includes mechanical agitation means.

### Claim 4 (depends on 3)

The process of claim 3 wherein said solution of polymeric aromatic amine is a solution of an amine of the formula ##STR36## wherein n is an integer greater than 1, X.sup.- is an anion, at least one but not more than two of the R's are covalent links bonding the n aromatic rings into a polymer unit molecule and the remaining R's are independently selected from among hydrogens, hydroxyls, amides, sulfonates, carboxylates, lower alkyls, and esters.

### Claim 5 (depends on 4)

The process of claim 4 wherein said polymer unit molecule has a polymeric backbone of poly(vinylamine).

### Claim 6

The process of diazotization of a polymeric aromatic amine salt of the formula ##STR37## wherein n is an integer greater than 1 and X.sup.- is a halogen anion which comprises feeding a 0.5% to 10% by weight solution of said polymeric aromatic amine salt and a separate solution of 1 to 1.35 equivalents of nitrite ion to a turbulent reaction zone at a combined liquid flow rate of not less than 1 reaction zone volume per minute and a pH of from pH 0 to pH 4 and a reaction temperature of from -5.degree. C. to 50.degree. C. and continuously withdrawing the resulting reaction product to maintain the reaction zone liquid volume.