Patent · US Active

Composite polyamide membrane having high acid content and low azo content

US9616392B2 · kind B2 · utility

2Cited by

73References

7Claims

0Family size

Assignee

DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

Ian A. Tomlinson · Midland, US
Robert C. Cieslinski · Midland, US
Bruce B. Gerhart · Midland, US
David D. Hawn · Midland, US
Mou Paul · Edina, US
XiaoHua Qiu · Midland, US
Mark Rickard · Midland, US
Steven Rosenberg · Shorewood, US
Abhishek Roy · Edina, US
Chengli Zu · Midland, US

Key dates

Filing date	Dec 15, 2014
Grant date	Apr 11, 2017
Priority date	—
Expiry date	Dec 15, 2034

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D2323/40
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A thin film composite polyamide membrane comprising a porous support and a thin film polyamide layer characterized by possessing: i) an azo (—N═N—) content of from 0.30% to 0.80%, as measured by pyrolysis gas chromatography; and ii) a dissociated carboxylate content of at least 0.18 mol/kg as measured by RBS at pH 9.5.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.