DODGEN Reaction and Separation Technology Assists Green and Low-Carbon Development

dodgen advanced reaction and separation technology assists high purity green and low carbon development of the lithium industry

On June 28, The first China New materials (lithium electric chemicals) wealth Forum was held in Quancheng Jinan.Kang Xiaoling, general manager of Shanghai DODGEN Chemical Technology Co., Ltd. was invited to participate in the meeting and gave a presentation entitled "Lithium electric chemicals -- Solutions for Advanced reaction and separation Technology of DODGEN Chemical".He shared the industrial background, modular reaction separation technology, and DODGEN chemical production technology cases, which were warmly welcomed.

Lithium Electrochemical Industry Background

Under carbon peaking and carbon neutrality goals, lithium-ion batteries are dominating the chemical power market with the increasing popularity of large mobile devices (such as new energy vehicles), energy storage stations and other portable charging devices.

Choosing raw materials with green technology and lower carbon emissions is an important choice for battery industry chain.Most lithium electric materials belong to carbon consumption type, which is expected to usher in emission reduction dividend; It is no exaggeration to say that in the next ten years, whether an enterprise can seize the initiative in the low-carbon transformation of the power battery industry chain will determine whether an enterprise can maintain its industrial competitiveness.

Traditional batch reaction and purification methods have encountered "bottlenecks" in the face of increasing device size, higher product purity requirements, and lower energy consumption. With the rapid expansion of downstream industries, the lithium industry is facing higher challenges, and more stringent requirements are put forward for reaction and separation processes.

Modular Reaction Separation Technology

Lithium battery electrolyte is equivalent to the "blood" of lithium battery, which plays a key role in battery performance.In order to meet the requirements of different battery performances, such as high energy density, low-temperature stability, cycle life, etc.,and based on the physical characteristics of different products and the application characteristics of chemical unit operations, chemical processing company DODGEN uses its proprietary modular reaction and efficient separation and purification technology to provide stable, complete, low energy consumption and ultra-pure solutions for the reaction and purification technology of carbonate series products,and have reached the annual production of tens of thousands of tons of single equipment.

DODGEN's reactive separation technology portfolio covers all the key parts of lithium batteries. In addition to the carbonate (EC/DMC/EMC/DEC/VC/FEC), we have a lot of achievements. DODGEN also has a lot of experience and patent technology in cyanide (nitrile/Prussian blue/Prussian white), fluoride (LIFSI/ flurane), sulfide, polyacrylic acid/acrylonitrile, silane and other fields.

The main modular device technology includes a circulation reaction module, large flux micro reaction module, distillation/evaporation/extraction/crystallization/membrane separation and other multifunctional coupling modules. The pilot scale can reach 10-1000t/a,which quickly and efficiently serves our customers and contributes to the industrialization of lithium electric chemicals.

In order to meet the requirements of rapid iteration of lithium chemical technology and high quality products, DODGEN Chemical Ningxia Ningdong pilot Test Base can carry out pilot test verification work, improve the process conditions and verify the stability of the process and equipment.

  • Complete the pilot test quickly and reduce the technical risks in the process of industrialization

  • Advanced technology of pilot module can produce high quality products

  • A variety of reaction and separation modules in the pilot test base to meet different process requirements

  • Rapid and efficient pilot test verification, low test cost, lithium electric chemicals can be put on the market in a short time

DODGEN Licensed Technology Application

Carbonate chemicals have the advantages of high permittivity, low viscosity, low viscosity, low price and so on. They are the mainstream solvents and additives in the current commercial lithium-ion battery electrolyte. Carbonates can react with carbon dioxide and epoxides to consume carbon dioxide,and then reduce carbon emissions.

Using DMC as an electrolyte solvent can provide higher current density as well as stronger antioxidant properties, resulting in better electrical conductivity and longer battery life.With the development of lithium-ion batteries, the purity of electrolyte solvents is required to be higher and higher, so battery-level DMC has great room for improvement in both scale and quality.

At present, the high-quality battery-grade DMC products required in the market not only require the mass concentration of DMC to be higher than 99.99%, but also the total content of A, ethanol and moisture content to be less than 20ppm.

The DMC products obtained by the traditional process using the distillation method not only have high energy consumption, immature technology and difficult to achieve large-scale stable production, but also contain a large amount of methanol, ethanol, water and other impurities, which seriously affect the charge and discharge capacity and times of lithium-ion batteries and reduce the battery life.In order to meet the technical requirements,we need to improve the quality of the electrolyte, so it is necessary to further remove the impurities such as methanol, ethanol and water in the DMC. It can be seen that the stable and low energy consumption separation technology is very important.

The DMC with 99.8% purity is increased to 99.99% by Donggung Chemical's proprietary melting crystallization purification method (taking 20,000 tons capacity as an example), which requires about 500kwh power consumption. In contrast, the steam consumption required by the traditional purification method is greater than 5.5t/t.

In addition to DMC, other carbonates such as vinyl carbonate, vinyl carbonate and fluorinated vinyl carbonate can also be purified by falling film melting crystallization.High purity carbonate products can be obtained by melting and crystallization treatment according to different feed purity, which can meet the demand for purity of electronic chemicals.

In conclusion, the melting crystallization technology of Donggeng has a high degree of applicability in the purification of lithium electric chemicals, which can reduce the energy consumption and the comprehensive cost of products for enterprises.It is of great benefit to energy saving and emission reduction at the same time to promote the green and low-carbon development of the lithium industry.

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