MVR Evaporator for Anhydrous Sodium Sulfate (Na₂SO₄) Production

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MVR Evaporator for Anhydrous Sodium Sulfate (Na₂SO₄) Production

This project utilizes an MVR forced circulation evaporator for the production of anhydrous sodium sulfate (Na₂SO₄) from sodium sulfate-rich solutions. The system concentrates the feed to a supersaturated state, followed by crystallization and centrifugal separation to recover high-quality sodium sulfate crystals. By recycling secondary vapor as the heating source, the MVR system significantly reduces steam consumption, operating costs, and carbon emissions while providing a reliable, energy-efficient solution for industrial salt recovery and Zero Liquid Discharge (ZLD) applications.

Equipment: MVR evaporator;

Feed composition: sodium sulfate rich sulution;

Evaporation capacity: 20,000.00kg/h;

Construction material: product wetted parts adopt SS316L, non wetted parts adopt SS 304 or carbons steel per actual need.

Chemical Industry Tags: ,

Description

Project Description

Anhydrous sodium sulfate (Na₂SO₄), also known as thenardite, is an important industrial chemical widely used in the detergent, glass, pulp and paper, textile, and chemical industries.

It is commonly produced by concentrating sodium sulfate-rich solutions, such as natural brines or chemical process by-products, through evaporation and crystallization. Mechanical Vapor Recompression (MVR) technology offers an energy-efficient and environmentally friendly solution by recycling secondary vapor as the primary heat source, significantly reducing steam consumption and operating costs.

Process Flow    

The MVR evaporator system continuously concentrates the sodium sulfate solution until it reaches supersaturation, promoting the crystallization of anhydrous sodium sulfate.

The supersaturated slurry is then transferred to a centrifuge for solid-liquid separation. Anhydrous sodium sulfate crystals are recovered as the final product, while the mother liquor is recycled to the evaporator for further concentration. This closed-loop process maximizes product recovery, minimizes wastewater discharge, and enables stable continuous operation.

The complete system typically includes:

•  Condensate preheater

•  Exhaust vapor preheater

•  Exhaust condenser

•  Forced circulation evaporator

•  Vapor scrubber

•  Mechanical Vapor Recompression (MVR) unit

•  Thickener

•  Mother liquor tank

•  Centrifuge

•  Pumping system

•  DCS automatic control system

 

System Features

•  High Energy Efficiency

The MVR system recovers and recompresses secondary vapor for reuse as the heating source, reducing fresh steam consumption by up to 90% compared with conventional evaporation systems.

•  Optimized Forced Circulation Design

High circulation velocity minimizes scaling and tube fouling while ensuring stable heat transfer, making the system ideal for high-concentration sodium sulfate solutions and crystal slurries.

•  High Product Recovery

The crystallization process is carefully controlled to achieve efficient recovery of high-purity anhydrous sodium sulfate while maximizing yield.

•  Reliable Continuous Operation

An advanced DCS control system provides automatic monitoring and process control, ensuring stable operation, reduced maintenance, and lower operating costs.

•  Sustainable Resource Recovery

The system converts sodium sulfate-rich waste streams into valuable products while reducing wastewater discharge, helping customers achieve resource recovery and Zero Liquid Discharge (ZLD) objectives.

Applications

The MVR evaporator system is suitable for:

•  Sodium sulfate production from natural brines

•  Chemical manufacturing

•  Detergent production

•  Dye and pigment manufacturing

•  Textile processing

•  Pulp and paper industry

•  Glass manufacturing

•  Industrial wastewater treatment and salt recovery

Why Choose Our MVR Evaporator For Sodium Sulfate Production?

•  Low energy consumption and operating costs

•  High recovery of anhydrous sodium sulfate

•  Stable and continuous operation

•  Reduced scaling and maintenance requirements

•  Compact plant layout

•  Fully automated DCS control

•  Customized design based on feed composition and production capacity

•  Proven solution for resource recovery and ZLD applications

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