Double-Effect Evaporator

Double-Effect Evaporator | Energy-Efficient Vacuum Low-Temperature Concentration Equipment for Medium- to Large-Scale Production Lines

💡 Dual-effect evaporators are the standard energy-efficient vacuum concentration equipment for medium- to large-scale production lines. They feature series-connected, cascade heat exchange between the first and second effects and reuse primary steam as a secondary heat source, achieving energy savings of 40% or more compared to single-effect equipment. The low-temperature, negative-pressure operating conditions fully preserve the activity of heat-sensitive materials, making it suitable for the continuous concentration of traditional Chinese medicine, plant extracts, food, and health supplements.

I. Product Overview

Double-effect evaporators are commonly used in industrial production.Energy-Efficient Vacuum Concentration Equipment, featuring a series evaporation configuration with a first-effect and second-effect evaporator, where the secondary steam generated by the first-effect unit serves as the heat source for the second-effect unit, enabling the reuse of thermal energy and significantly reducing steam consumption. The equipment operates under vacuum at low temperatures, ensuring gentle heating of the feed solution and effectively protecting heat-sensitive components. It is widely used in the evaporation and concentration processes of feed solutions in industries such as traditional Chinese medicine, plant extraction, food, and health supplements, and is suitable for medium- to large-scale production lines.

II. Structural Configuration Description

The equipment primarily consists of a first-effect heating chamber, a first-effect separation chamber, a second-effect heating chamber, a second-effect separation chamber, a condenser, a condensate recovery tank, a vacuum unit, piping and valves, and a complete automatic control system. Depending on the material processing requirements, the following options may be selected:External-circuit, falling-filmTwo main structural configurations, featuring a fully enclosed, hygienic, integrated design:

✅ Dual-effect cascaded heat exchange structure

Secondary steam from the first effect is used to heat the second effect, allowing for the recycling and reuse of thermal energy. This significantly reduces boiler steam and cooling water consumption, thereby lowering operating costs over the long term during mass production.

✅ Multi-stage gas-liquid separation and demisting unit

The two-stage independent separation structure effectively prevents material carryover in the feed liquid, achieving high recovery rates for organic solvents such as ethanol and reducing raw material loss.

✅ Entirely constructed from sanitary-grade stainless steel

The inner walls of the tanks and piping are mirror-polished, leaving no hygiene dead zones; they are corrosion-resistant and easy to clean and disinfect, and comply with pharmaceutical and food-grade cleanroom standards.

✅ Expandable full suite of auxiliary automation modules

Functional modules such as an automatic defoaming system, intelligent temperature control, and CIP (Clean-in-Place) can be integrated as needed to enable fully automated control throughout the entire process.

III. Key Features

✅ Dual-effect heat recycling for outstanding energy savings

The cascaded reuse of secondary steam achieves energy savings of 40% or more compared to single-effect concentration equipment. It is suitable for long-term, continuous mass production projects and significantly reduces steam operating costs.

✅ Gentle evaporation under vacuum at low temperatures to preserve heat-sensitive active ingredients

The process operates under negative pressure and at low temperatures throughout, ensuring that the feedstock is exposed to gentle and brief heating, thereby preventing the loss of active ingredients in traditional Chinese medicine, fruit juices, and biological raw materials due to high-temperature oxidation and caramelization.

✅ Fast evaporation rate, suitable for high-volume continuous production

With ample heat exchange area and high evaporation efficiency, each unit has a large processing capacity and can support uninterrupted, continuous concentration operations 24 hours a day, 7 days a week.

✅ Smooth material flow and minimal maintenance

The rational circulation channel design reduces localized material stagnation and buildup, minimizes the risk of material sticking to the walls and forming scale, and simplifies equipment shutdown for cleaning as well as routine maintenance.

✅ Materials that comply with hygiene standards and meet GMP food regulations

The entire unit is manufactured from 304/316L food-grade stainless steel, with a mirror-polished finish inside and out with no blind spots, and fully complies with pharmaceutical GMP and food safety production standards.

✅ Multi-mode automatic control, stable operation, and easy to use

Supports two operating modes: semi-automatic manual operation and fully automatic PLC interlock control. Temperature, vacuum, and liquid level are automatically regulated, ensuring simple operation and stable, reliable performance.

IV. Scope of Application

Widely used in the pharmaceutical, plant extraction, food, health supplement, daily chemical, and fine chemical industries, this system is designed to perform low-temperature vacuum continuous concentration of aqueous solutions, alcohol-based extracts, and various heat-sensitive raw materials.

V. General Technical Specifications

VI. Service Commitment

We provide end-to-end, one-stop implementation services: customized concentration process design, in-house manufacturing of complete units, on-site installation and commissioning, process training for operators, and lifetime after-sales maintenance and support. Equipment can be custom-built to meet specific requirements for materials, facility layout, and production capacity. We ship complete units nationwide and offer rapid on-site surveys and maintenance response within Chongqing.

🔗 Recommended Compatible Devices

Complete Line Configuration for Dual-Effect Concentration:
✅ Extraction of raw materials from the front end:Extraction equipment
✅ Online Equipment Cleaning:CIP (Clean-in-Place) System
✅ Purification and Impurity Removal from Feed Solutions:Separation and Purification Equipment