{"id":294,"date":"2026-07-08T15:36:48","date_gmt":"2026-07-08T07:36:48","guid":{"rendered":"https:\/\/www.rubri.cn\/products\/v2-product-2-4\/"},"modified":"2026-10-27T07:18:13","modified_gmt":"2026-10-26T23:18:13","slug":"monovalent-selective-membrane","status":"publish","type":"indie_product","link":"https:\/\/www.rubri.cn\/en\/products\/product-components\/monovalent-selective-membrane\/","title":{"rendered":"Monovalent-selective membrane"},"content":{"rendered":"<p>The monovalent-selective membrane is a functionalized membrane material with a selective layer formed on the surface of an ion-exchange membrane. It maintains high permeability to monovalent ions while inhibiting the migration of divalent and multivalent ions, and is used for salt separation, salt purification, and selective separation of specific ions.<\/p>\n<h2>Structure and Principle<\/h2>\n<ul>\n<li>A thin layer carrying the same charge is formed on the surface of a conventional ion-exchange membrane, creating an electrostatic repulsion barrier.<\/li>\n<li>Multivalent ions have higher charge density and experience stronger repulsion, so their migration is inhibited; monovalent ions can pass preferentially.<\/li>\n<li>Selectivity is related to membrane surface charge density, operating current density, and feed composition, and must be verified according to operating conditions.<\/li>\n<\/ul>\n<h2>Product Features<\/h2>\n<ul>\n<li>It enables separation of monovalent and multivalent ions, creating conditions for salt separation and crystallization and for salt purification.<\/li>\n<li>It has mature applications in scenarios such as the separation of sodium chloride and sodium sulfate, and the separation of chloride ions and sulfate ions.<\/li>\n<li>No chemical agents need to be dosed; separation relies on the electric field and membrane selectivity.<\/li>\n<li>It can be assembled in combination with conventional electrodialysis membranes to form a dedicated stack for salt separation.<\/li>\n<\/ul>\n<h2>Application Industries<\/h2>\n<ul>\n<li>Salt separation treatment of high-salinity wastewater and purification of salt products.<\/li>\n<li>Brine purification and sulfate removal in the chlor-alkali industry.<\/li>\n<li>Separation and separate crystallization of sodium chloride and sodium sulfate in zero liquid discharge projects.<\/li>\n<li>Seawater concentration for salt production and comprehensive utilization of brine resources.<\/li>\n<\/ul>\n<h2>Specifications and Models<\/h2>\n<div class=\"iw-table-wrap\">\n<table class=\"iw-table\">\n<tr>\n<th>Parameter<\/th>\n<th>Unit<\/th>\n<th>Typical value<\/th>\n<\/tr>\n<tr>\n<td>Membrane Type<\/td>\n<td>\u2014<\/td>\n<td>Monovalent cation-selective membrane \/ monovalent anion-selective membrane<\/td>\n<\/tr>\n<tr>\n<td>Selectivity coefficient (Na\u207a\/Ca\u00b2\u207a)<\/td>\n<td>\u2014<\/td>\n<td>2\u201310 (typical value)<\/td>\n<\/tr>\n<tr>\n<td>Area Resistance<\/td>\n<td>\u03a9\u00b7cm\u00b2<\/td>\n<td>2\u20138 (typical value)<\/td>\n<\/tr>\n<tr>\n<td>Transport number<\/td>\n<td>\u2014<\/td>\n<td>\u2265 0.9 (typical value)<\/td>\n<\/tr>\n<tr>\n<td>Operating temperature<\/td>\n<td>\u2103<\/td>\n<td>5\u201340 (typical)<\/td>\n<\/tr>\n<tr>\n<td>Burst strength<\/td>\n<td>MPa<\/td>\n<td>\u2265 0.3 (typical value)<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<p>The data in the table are common ranges for similar equipment and are for selection reference only; specific specifications, models, materials, connections, and control methods must be confirmed during the selection stage based on water quality, treatment scale, and site conditions.<\/p>","protected":false},"excerpt":{"rendered":"<p>Preferentially separates monovalent ions for lithium brine processing, selective salt separation, and high-selectivity concentration.<\/p>","protected":false},"featured_media":649,"parent":304,"menu_order":40,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"indie_product_cat":[],"class_list":["post-294","indie_product","type-indie_product","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/www.rubri.cn\/en\/wp-json\/wp\/v2\/indie_product\/294","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rubri.cn\/en\/wp-json\/wp\/v2\/indie_product"}],"about":[{"href":"https:\/\/www.rubri.cn\/en\/wp-json\/wp\/v2\/types\/indie_product"}],"up":[{"embeddable":true,"href":"https:\/\/www.rubri.cn\/en\/wp-json\/wp\/v2\/indie_product\/304"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.rubri.cn\/en\/wp-json\/wp\/v2\/media\/649"}],"wp:attachment":[{"href":"https:\/\/www.rubri.cn\/en\/wp-json\/wp\/v2\/media?parent=294"}],"wp:term":[{"taxonomy":"indie_product_cat","embeddable":true,"href":"https:\/\/www.rubri.cn\/en\/wp-json\/wp\/v2\/indie_product_cat?post=294"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}