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A Comprehensive Guide to the Chemistry, Properties, and Industrial Application of Sodium Dithionite
Sodium Hydrosulfite (also known as Sodium Dithionite, Na2S2O4) is a white crystalline powder with a weak sulfurous odor. It is a highly effective reducing agent widely used across global manufacturing sectors. The 85% concentration represents the industrial standard balance between reduction potential, performance stability, and handling safety.
As a powerful sulfur-based reducing agent, Sodium Hydrosulfite exhibits high affinity for oxygen in solution. The anhydrous form is stable under dry, cool conditions, but in the presence of moisture and air, it oxidizes rapidly to form sodium bisulfate and sodium bisulfite, releasing significant heat. Proper packaging and environmental control are critical.
Classified under UN Number 1384, class 4.2 (Substances liable to spontaneous combustion). Under extreme heat, exposure to water, or acids, it can undergo exothermic decomposition, releasing toxic sulfur dioxide (SO2) gas. Storing the product in airtight steel containers in climate-controlled environments is essential to ensure long-term shelf life.
| Production Route | Chemical Mechanism | Environmental Profile | Typical Purity / Quality Control |
|---|---|---|---|
| Sodium Formate Method | Reaction of Sodium Formate, SO2, and NaOH in an alcohol solution. | High environmental compliance, minimal solid waste byproduct, green process. | Highly pure crystal formation, yields ≥ 85% or 90% stability. |
| Zinc Dust Method | Reduction of sulfur dioxide with zinc powder, followed by replacement. | Generates heavy metal zinc residues, requires complex wastewater treatment. | Standard industrial grade, but trace zinc residues remain. |
| Amalgam Method | Reaction using sodium amalgam and sulfur dioxide. | Obsolete due to mercury contamination and environmental hazard regulations. | No longer deployed in modern, ecologically compliant factories. |
How Sodium Hydrosulfite 85% Serves as a Critical Process Enabler Across Global Industries
In textile processing, insolubilized vat dyes (such as indigo) must be chemically reduced to water-soluble, substantive "leuco" forms before applying to cotton or cellulose fibers. Sodium Hydrosulfite 85% is the premier reducing agent used to convert vat dyes. It maintains the required negative redox potential (typically -800 to -1000 mV) in an alkaline media. Additionally, it is used in reduction clearing post-dyeing to strip unfixed disperse dyes from polyester blends, ensuring color fastness and brilliance.
For paper manufacturing, mechanical pulp (TMP, CTMP, and groundwood) contains lignin, which naturally degrades and yellows when exposed to light and air. Rather than destroying the lignin (which reduces yield), pulp manufacturers utilize Sodium Hydrosulfite to reduce chromophoric groups within the lignin matrix. This selective reducing bleach increases pulp brightness by 10 to 12 ISO points, maintaining fiber integrity and mechanical strength while providing cost-efficient bleaching.
In kaolin clay refining, iron-based impurities (specifically ferric iron oxides, Fe3+) cause unsightly yellow/brown discoloration, rendering the clay unsuitable for high-quality ceramics, coatings, and paper fillers. Dosing Sodium Hydrosulfite 85% reduces the insoluble trivalent ferric iron to highly soluble divalent ferrous iron (Fe2+). The dissolved iron is subsequently washed out of the clay slurry, leaving a bright, white mineral product that meets strict industrial specifications.
Innovation Trends in the Production and Environmental Engineering of Sodium Dithionite
We are researching surface modification and encapsulation technologies. Utilizing trace amounts of food-grade stabilizers prevents ambient moisture contact, reducing the risk of spontaneous degradation during maritime transit.
By capturing SO2 tail gas and recycling process alcohol back into the reaction system, we are approaching zero-emission goals for the Sodium Formate process route, reducing production footprints.
Integrating real-time temperature, humidity, and location tracking on container shipments prevents thermal buildup, ensuring product safety during long-haul transit across international ports.
We are developing mixed formulations containing specialized chelators that aid post-dyeing oxidation, lowering chemical oxygen demand (COD) in wastewater treatment plants.
Delivering Stability, Security, and Scalable Value to Global Markets
To guarantee prompt international dispatch, we operate strategically positioned warehouse facilities at key shipping hubs, including Qingdao Port, Tianjin Port, and critical Central Asian border gateways (Alashankou, Khorgos). This network enables flexible multi-modal logistics options (maritime, rail, overland truck) adapted to destination parameters.
Founded in 2006 (Stock Code: 307785), Shandong Pulisi has grown into a key supply partner for petrochemical, mining, feed, and pharmaceutical chemicals globally. Our direct factory access and scale protect customers from price volatility and product shortages, maintaining continuous product availability.
Our operation is built on verified compliance. We maintain long-term partnerships with Fortune Global 500 enterprises, including China National Petroleum Corporation (CNPC) and Saint-Gobain. Operating under ISO 9001:2015 standards and validated by German BV audits, we ensure that every batch meets specification.
Stock Code: 307785 — A Legacy of Professionalism, Integrity, and Global Delivery
Shandong Pulisi Chemical Co., Ltd. was established in 2006. The company focuses on petrochemicals, mining chemicals, feed chemicals, and pharmaceutical chemicals. At present, the company has established long-term and stable partnerships with Fortune Global 500 companies such as China National Petroleum Corporation and Saint-Gobain. We always take customer demand as the core orientation and provide tailored solutions to help customers strengthen their market competitiveness.
The company has passed ISO9001:2015 Quality Management System Certification and German BV Certification, and has been awarded multiple honors such as Foreign-Oriented Economic Enterprise, Alibaba Demonstration Base, and Contribution Enterprise. In 2023, the company successfully went public with stock code: 307785.
The company upholds the corporate culture philosophy of "Customer First, Rapid Response; Striving as the Foundation, Efficient Collaboration; Integrity and Uprightness, Agile Adaptation." We focus on providing compliant and high-quality products and supporting services, and are committed to becoming a long-term and stable partner for customers.
Meanwhile, the company has established mature warehousing and distribution systems at key logistics hubs, including Qingdao Port, Tianjin Port, and Xinjiang border ports (Alashankou, Khorgos). We are able to provide flexible supply solutions according to customer needs to ensure timely order delivery. No matter where customers are located, Shandong Pulisi Chemical will safeguard their business development with professional service systems and efficient response capabilities.
Strict Statement: Shandong Pulisi has not established branches outside of Shandong Province. If there is any act of impersonating Shandong Pulisi, our company will reserve the right to pursue legal responsibilities.
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More than 20+ years of export experience, maintaining active cooperative relations with more than 1,000 global companies.
All supply lines meet rigorous industrial standards, backed by ISO, SGS, K-REACH, and FAMI-QS certifications.
We always provide reasonable prices based on customization, bulk volume, and packaging design requirements.
We maintain dedicated storage warehouses at key sea and dry ports, ensuring prompt dispatch and reduced lead times.
An efficient, responsive sales and technical support team handles chemical handling queries and after-sale service.
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Technical and Commercial Answers from Our Support Team
Of course you can. Just send us your logo design and packing requirements, and our OEM team will integrate it into the final packaging.
If you are a small retailer or entrepreneur, we would absolutely love to grow with you. We look forward to building a long-term relationship with you.
We always put our customers' interests first. Prices are negotiable under different conditions, and we guarantee that you will get the most competitive price.
Yes, we provide free samples for quality evaluation and testing. Please contact our sales team to coordinate shipping details.
Yes, of course! We have been specializing in this field for many years and many of our customers have made deals with me because we can deliver on time and guarantee top quality goods!
We accept T/T, L/C, D/P and O/A. Third-party transaction audits can be arranged upon request.
Of course, you are very welcome to visit our company in Zibo, China (1.5 hours drive from Jinan airport). We welcome on-site quality audits.
You can send an inquiry directly to our sales representative for detailed order information, and we will explain the transaction and shipping process to you step-by-step.
It must be stored in a dry, well-ventilated warehouse, away from heat, ignition sources, direct sunlight, acids, and moisture. Ensure container lids remain sealed. Do not store near combustible materials due to self-heating risks.
The Sodium Formate route offers a cleaner manufacturing process with high purity, whereas the Zinc Dust method can leave heavy metal traces. Shandong Pulisi utilizes compliant production lines to ensure trace impurities remain within safe tolerances.
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