US 12,447,441 B2 · Process for obtaining polyamide membrane with nanostructured coating, membranes and use

Process for obtaining polyamide membrane with nanostructured coating, membranes and use

AssigneesPetroleo Brasileiro S.A. - Petrobras, Universidade Federal De Minas Gerais - Ufmg

InventorsRodrigo Suhett De Souza, Ricardo De Araujo Cid Da Silva, Yara Luiza Brasil Zanon, Vinícius Gomide De Castro, Miriam Cristina Santos Amaral Moravia, Glaura Goulart Silva, Bruna Caroline De Jesus Ribeiro, Ana Luiza Silvestre Assis

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Abstract

The present invention refers to a surface coating of commercial polyamide (PA) membranes with graphene oxide (GO) using a technology that involves spin-coating with specific sequence of low and high rotation, interface phenomena provided by a set of materials containing ethyl alcohol in high concentration, as well as morphological characteristics and customized surface chemistry of GO, among other conditions that allow a differentiated technology to obtain an effective coating of GO on PA membrane.

Claims5

Dependent claims

A process for obtaining polyamide membrane with nanostructured coating, the process comprising the following steps:

(a) prepare dispersion of graphene oxide (GO) in absolute ethyl alcohol (99.5%) between 0.1 g/L and 2 g/L;
(b) apply the dispersion obtained in step (a) on reverse osmosis membranes made of a selective polyamide (PA) layer, using spin coating technique, with low rotation stage followed by high rotation;
(c) repeat step (b) between 1 and 5 times;
and
(d) immerse the membranes in water immediately after step (c).

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/994,686Filed 28 Nov 2022

Priority

BR 10 2021 023979 427 Nov 2021

Published

US 2023/0166215 A11 Jun 2023

Granted

21 Oct 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

B01D 61/026
Reverse osmosis; Hyperfiltration: comprising multiple reverse osmosis steps
B01D 67/0002
Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus: organic membrane manufacture
B01D 67/0088
After-treatment of organic or inorganic membranes: physical treatment with compounds, e.g. swelling, coating or impregnation
B01D 67/00931
Chemical modification: by introduction of specific groups after membrane formation, e.g. by grafting