System and method for synthesizing polymeric capsules for water softening

Patent metadata

Field	Value
Publication number	US-11110419-B2
Application number	US-201816106082-A
Country	US
Kind code	B2
Filing date	Aug 21, 2018
Priority date	Aug 21, 2018
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

A system and method are directed toward the synthesis of polymeric capsules using a phase inversion process by extrusion of polymeric droplets through a syringe-needle assembly or an iris-shutter mechanism. The polymeric solution may be prepared by dissolving PAN (polyacrylonitrile) polymer in DMF (Dimethyl Formamide) solvent at high temperature through continuous stirring. Following preparation of the capsules, further treatment was initiated using triethylamine in gelation bath to make the final product an efficient removal agent of water hardness.

First claim

What is claimed is:

1. A method for synthesizing polymeric capsules for water softening, the method comprising:
preparing a polymeric solution comprising polyacrylonitrile (PAN) and dimethyl formamide (DMF) in a hopper;
regulating a valve to selectively provide a flow of polymeric solution into an auger assembly;
extruding the polymeric solution through a discharge nozzle to form the polymeric capsules;
submerging the polymeric capsules in a gelation bath; and
treating the polymeric capsules in an amine solution comprising trimethylamine solution to remove calcium and magnesium from the polymeric capsules.

2. The method of claim 1 , wherein preparing a polymeric solution comprises:
stirring the polymeric solution with an agitator blade within the hopper.

3. The method of claim 1 , wherein preparing a polymeric solution comprises:
heating the polymeric solution with a hopper heating element.

4. The method of claim 1 , wherein the discharge nozzle comprises a syringe and needle assembly, and extruding the polymeric solution comprises selectively urging the polymeric solution through the syringe and needle assembly.

5. The method of claim 1 , wherein the gelation bath comprises water.

6. The method of claim 1 , further comprising:
stirring the gelation bath using a mixer.

7. The method of claim 1 , wherein a receiving drum is positioned below the discharge nozzle for receiving the polymeric solution and wherein a water pump urges a flow of water into the receiving drum.

8. The method of claim 7 , wherein the receiving drum includes a plurality of radially extending vanes which divide the receiving drum into a plurality of drum reservoirs.

9. The method of claim 8 , wherein the receiving drum is rotatable to receive the polymeric solution in one of the plurality drum reservoirs while dropping the polymeric capsules out of the gelation bath from another one of plurality the drum reservoirs.

10. The method of claim 1 , further comprising:
screening the polymeric capsules from the gelation bath using a mesh screen.

11. The method of claim 1 , wherein the amine solution further comprises triethylene.

Assignees

• Haier Us Appliance Solutions Inc

Inventors

• Chatterjee Somak
• Prasad Sharath Chandra
• Pasham Srinivas
• Srinivasan Balaji
• Verma Gaurav Kumar
• Krause Andrew Reinhard
• Chernov Gregory Sergeevich

Classifications

• B01J2/06 Primary

  in a liquid medium · CPC title

• B01J13/046

  combined with gelification or coagulation · CPC title

• B01J13/20

  After-treatment of capsule walls, e.g. hardening · CPC title

• B01J2/12

  in rotating drums · CPC title