DODGEN

Electronic-Grade Vinylene Carbonate (VC) Synthesis Project Case

Case Introduction

DODGEN provided a complete process technology package transfer and core equipment services for a Shandong new materials company, covering an annual capacity of 11,000 t/a of Chloroethylene Carbonate (CEC) and 4,000 t/a of Vinylene Carbonate (VC). The project adopted an advanced purification technology coupling “distillation + melt crystallization”, successfully enabling stable mass production of electronic-grade VC. The product purity reached ≥99.995%, meeting the stringent demand for high-purity additives in the lithium-battery electrolyte market.

Project Background

Industry Demand: With the rapid expansion of the new energy vehicle and energy storage markets, demand for lithium batteries continues to grow at a high rate. Vinylene Carbonate (VC), as a key electrolyte additive, forms an SEI film on the surfaces of both cathode and anode, playing a critical role in improving battery specific capacity, cycle life, and safety.

Limitations of Conventional Processes: In traditional processes, purification after VC synthesis is highly challenging due to VC’s strong thermal sensitivity. Improper handling can easily result in low yield and poor color quality. Conventional distillation methods are energy-intensive and struggle to effectively remove trace impurities (such as water, acidity, and metal ions), making it difficult to meet electronic-grade (ultra-high-purity) standards.

Customer Project Plan:The customer initiated a greenfield project aimed at establishing production capacity for high-end electrolyte materials.

Planned Capacity:The overall project scale is 11,000 tonsof Chloroethylene Carbonate (CEC) and 4,000 tons of Vinylene Carbonate (VC).

Project Highlights and Core Value

Core Technical Services:

DODGEN provided full-process support from CEC synthesis to VC purification, including process package design, supply of key equipment (such as falling-film melt crystallizers and distillation column internals), and full-cycle technical guidance services (including installation supervision and commissioning/start-up support).

Process Innovation (Distillation + Melt Crystallization Coupling):

Instead of relying on distillation alone, the project adopted a “distillation + falling-film melt crystallization coupling” approach. Leveraging the melting-point differences between VC and impurities, DODGEN’s proprietary falling-film melt crystallizer enables deep purification without introducing any solvents.

The process flow forms a complete closed loop, covering dechlorination after reaction, filtration and drying, triethylamine recovery, solvent recovery, rough distillation, rectification, and crystallization.

Excellent Product Quality:

1
Ultra-high purity

Compared with the national first-grade requirement of ≥99.95%, the design target of this project reaches ≥99.995%.

2
Strict impurity control

Moisture is controlled at ≤30 ppm, total chlorine ≤15 ppm, and color ≤20, fully meeting electronic-grade chemical standards.

Economic and Environmental Benefits:

1
Resource recycling

A complete triethylamine and solvent recovery system was implemented, significantly reducing specific raw-material consumption. By-products such as hydrochloric acid, sodium hypochlorite, and sodium chloride are effectively separated and utilized as resources.

2
Cost advantage

Compared with conventional processes, the high-efficiency purification technology substantially reduces energy consumption and maintenance costs, helping the customer gain a cost advantage in an increasingly competitive market.

Chemical Process Solutions

Process Technology

Separation Equipment

Continuous Flow Reactor

Application

Sustainability

Reaction and Separation Professional, Low Carbon Technology Partners

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