Preparation of organic acids by bipolar membrane electrodialysis

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Preparation of organic acids by bipolar membrane electrodialysis Specification

Organic Acid Recovery Rate
Up to 95%

Typical Conversion Efficiency
8095% depending on feed and operation conditions

Operating Voltage Range
210 V per cell pair, depending on feed composition and stack design

Advantages
No need for chemical addition for acidification or neutralization, high product purity, reduced byproduct formation, environmentally friendly process.

Electrolyte
Dilute acid and base solutions

Cell Stack Configuration
Alternating arrangement of anion and cation exchange membranes with bipolar membranes at set intervals

Scalability
Applicable for lab scale to industrial scale production

Current Density
50500 A/m

Operating Principle
Application of electric field across the membrane stack causes water dissociation and ion migration to produce purified organic acids and bases.

Reactants Input
Organic acid salt solution (e.g., sodium lactate, sodium acetate), water

Automation Compatibility
Can be integrated with automated process control systems

Process Description
Bipolar membrane electrodialysis involves the use of a stack of alternating anion and cation-exchange membranes, with bipolar membranes to split water molecules into H+ and OH-, facilitating the separation of organic acids from their salt solutions.

Construction Material
Stack frames and spacers made from chemically resistant polymers (e.g., PP, PVDF); electrodes usually titanium with noble metal coating.

Application
Preparation of organic acids

Product Output
Organic acids (such as lactic acid, acetic acid), corresponding alkaline and acidic solutions

Membrane Types
Anion exchange membrane, cation exchange membrane, bipolar membrane

Maintenance
Periodic cleaning required; membranes are durable under proper operation

Operating Temperature
1540C

Power Consumption
Typically 0.52.5 kWh/kg acid produced

Product Purification
Organic acid collected in acid compartment, base in base compartment; high purity due to selective ion transport

Preparation of organic acids by bipolar membrane electrodialysis Trade Information

Payment Terms
Telegraphic Transfer (T/T), Letter of Credit (L/C)

Sample Available
No

Main Export Market(s)
Asia, Australia, Central America, North America, South America, Eastern Europe, Western Europe, Middle East, Africa

Main Domestic Market
All India

Certifications
Ion exchange method is used in the downstream processing of traditional organic acid fermentation production. The ion exchange method is to make the organic acid salt solution through the acid type cation exchange column, in which the metal ion is exchanged with the hydrogen on the cation exchange resin, so as to convert the organic acid. The ion exchange column used in this method is large in volume, the ion exchange resin needs to be regenerated repeatedly, the operation is complicated, and a lot of acid base and washing water are consumed, and a lot of waste liquid is generated. If organic acids are produced directly from the fermentation liquid by bipolar membrane, the organic acids in the fermentation liquid are converted to organic acids by means of H+ of the bipolar membrane, and the dissociated OH- is combined with the cations in the fermentation liquid to form a base, which is then used for fermentation. This greatly reduces waste discharge, environmental pollution, chemical raw materials and energy consumption, and has significant industrial application value and environmental benefits; The process is simple, the product recovery rate and purity are high, and the economic benefits brought by the improvement of product quality are more significant. Bipolar membrane electrodialysis process has the advantages of high integration and energy saving, and has a wide range of application prospects in chemical production, biotechnology, food industry, environmental protection and other fields, such as: Organic salt production organic acid base/inorganic salt production inorganic acid base Ferrate preparation Chemical synthesis in organic phase Treatment of uranium processing wastewater Regeneration of sodium sulfate in rayon production Gas absorption Extraction and transformation of organic acid salts from fermentation broth Precipitation separation of soybean protein isolate Caseinic acid production

About Preparation of organic acids by bipolar membrane electrodialysis

Bipolar membrane is a new type of ion exchange composite membrane. The electrodialysis technology of bipolar membrane is applied to prepare the corresponding acid (HX) and base (MOH) from salt solution (MX). Under the action of direct current electric field, the salt anion (X-) enters the acid chamber through the anion exchange membrane, and then produces acid (HX) from the hydrogen ion dissociated from the bipolar membrane. The salt cation (M ) enters the alkali chamber through the cation exchange membrane, where it forms a base (MOH) with hydroxide ions dissociated from the bipolar membrane.

How Bipolar Membrane Electrodialysis Works

The process uses a series of anion, cation, and bipolar membranes arranged alternately. When an electric field is applied, water splits into H+ and OH- ions at the bipolar membranes, enabling the transformation of organic acid salts into purified organic acids in the acid compartment. The method ensures selective ion transfer, producing organic acids and bases in separate compartments.

Versatility and Scalability

Bipolar membrane electrodialysis is designed for flexibility, catering to both small-scale laboratory requirements and large-scale industrial production. Its modular design and compatibility with automated process controls make it adaptable for diverse applications, including research and mass manufacturing of high-purity organic acids.

Operational Excellence and Durability

Operating at 2-10 V per cell pair and 15-40C, the system maintains high conversion efficiency while minimizing power consumption. Made from chemically resistant polymers and noble-metal-coated titanium electrodes, it delivers consistent performance with only periodic membrane cleaning required, ensuring longevity and low maintenance.

FAQ's of Preparation of organic acids by bipolar membrane electrodialysis:

Q: How does bipolar membrane electrodialysis separate organic acids from their salts?

A: Bipolar membrane electrodialysis separates organic acids by applying an electric field across a stack of alternating anion, cation, and bipolar membranes. The bipolar membranes split water into hydrogen and hydroxide ions, enabling the selective migration of ions and converting organic acid salts into their respective acids and bases without additional chemicals.

Q: What are the main advantages of using bipolar membrane electrodialysis for organic acid preparation?

A: This process offers several benefits, including high product purity, reduced byproduct formation, no need for chemical additives for acidification or neutralization, and an environmentally friendly operation. It also delivers high conversion efficiency and recovery rates, along with scalability for both laboratory and industrial applications.

Q: When should periodic maintenance be performed on the membrane system?

A: Periodic cleaning should be scheduled based on the operating conditions and feed composition to maintain optimal performance and extend membrane life. Typically, regular maintenance ensures durability and prevents performance decline due to fouling or scaling.

Q: Where is this technology commonly applied?

A: Bipolar membrane electrodialysis is widely used in the chemical, food, and pharmaceutical industries for the production and purification of organic acids, such as lactic and acetic acids, especially where high purity and environmental considerations are priorities.

Q: What types of feed solutions are suitable for this process?

A: The system is designed for organic acid salt solutions, such as sodium lactate or sodium acetate, combined with water. The method is versatile in handling various organic acid salts to produce corresponding acids efficiently.

Q: How energy efficient is the process for producing organic acids?

A: Power consumption typically ranges from 0.5 to 2.5 kWh per kilogram of acid produced, depending on the feed composition, stack design, and operating conditions, making it a cost-effective and energy-efficient solution for organic acid production.

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