Engineering Excellence in Sulfonation Since 1999
ZJS is a China-based engineering company specializing in SO₃ sulfonation plants, surfactant production technology, petroleum sulfonate systems and chemical plant services.
ZJS is a China-based engineering company specializing in SO₃ sulfonation plants, surfactant production technology, petroleum sulfonate systems and chemical plant services.
55+
Plants Delivered Worldwide
Founded in 1999, Beijing Zijingshi Fine Chemical Technology Co., Ltd. (ZJS) is mainly engaged in engineering projects and technical services for fine chemicals, environmental protection, surfactants and SO₃ gas-phase sulfonation. Our work covers technology development, technology transfer, technical consultation, engineering design, equipment manufacturing and on-site service.
In the field of sulfur trioxide (SO₃) sulfonation, ZJS provides complete support for new product development, complete plant design, key equipment manufacturing, plant installation, commissioning, upgrading and technical training. Our sulfonation systems are used for LABSA, SLES/AES, SLS/K12, AOS, MES, heavy alkylbenzene sulfonate, petroleum sulfonate (WPS), sulfonated oils and other industrial surfactants.
ZJS combines laboratory testing, process engineering, equipment fabrication and installation support to help customers build reliable sulfonation plants or improve existing production lines. Our goal is to deliver practical, contract-respecting and technically sound solutions that support long-term customer cooperation.
Years in Business
Countries Served
Patents & Self Developed Technologies
From laboratory testing and process development to commercial-scale sulfonation plant engineering, ZJS has built its technical capability around practical project delivery and continuous improvement of sulfonation equipment.
Beijing Zijingshi Fine Chemical Technology Co., Ltd. was founded, focusing on fine chemical engineering, environmental protection, surfactants and technical services.
Completed our first turnkey sulfonation plant export to Saudi Arabia, marking our entry into global markets and establishing key partnerships.
Developed our patented multi-tube falling film SO₃ reactor, achieving 98%+ active matter content and significantly reducing energy consumption.
Received China National High-Tech Enterprise certification, securing national recognition for our SO, sulfonation technology and R&D capabilities.
The world's first and largest 7.2 t/hr sulfonation unit was successfully delivered, reshaping the global sulfonation industry landscape with Chinese technology.
Operating in 15+ countries with 20+ patents and self-developed technologies, we continue to set industry benchmarks in SO₃ sulfonation technology and plant performance.
Our competitive strength comes from focused SO3 sulfonation experience, practical engineering capability and complete technical services from laboratory testing to industrial production.
Our seasoned team brings deep expertise in the R&D and installation of sulfonation production facilities. With our own state-of-the-art manufacturing plant, we guarantee rigorous end-to-end quality control and full traceability for every component and system.
Produce LABSA with >97.5% active matter and ultra-low dioxane SLES (as low as 8 ppm) with our proprietary technology.
Sulfonation units from 40 to 8,000 kg/hr capacity, plus 3–10 kg/hr pilot and experimental falling film reactors.
Successfully delivered large-scale sulfonation plants in Middle East, Africa, South Asia, and Latin America with full commissioning support.
Our vertically integrated facility in Beijing handles every stage of plant production — from design engineering and precision fabrication to assembly, testing, and global logistics.
Our work combines process design, equipment fabrication, assembly inspection and on-site commissioning support. Each project is developed around the customer's raw materials, target product, capacity, utility conditions and compliance requirements.
A 1.6 t/h SO3 sulfonation plant for the production of LABSA, AES, AOS and related surfactants.
A 1 t/h LABSA sulfonation plant suitable for medium and small-scale detergent raw material production.
A 2 t/h sulfonation plant delivered for a UAE customer, supporting LABSA, AES and related product production.
Three sets of 3.8 t/h SO3 sulfonation plants, demonstrating ZJS experience in large-scale continuous sulfonation projects.
Our engineering processes, manufacturing facilities, and delivered plants meet the highest international quality and safety standards.
Key equipment for achieving efficient and stable sulfonation processes, supporting the industrial production of a full range of surfactant products.
European Conformity certification for all pressure equipment and machinery, compliant with PED 2014/68/EU directives.
Pressure vessel design and fabrication comply with ASME Boiler and Pressure Vessel Code (BPVC) Section VIII requirements.
Proprietary technology protected by over 15 national patents covering reactor design, process control, and safety systems.
We supply plants all over the world, from Saudi Arabia to Kuwait, from Ukraine to Greece, from Egypt to Nigeria.
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