Chlorosulfuric acid (ClHSO3) is a hazardous chemical used in many industries, but few know that it can cause serious health effects for workers. This article will explore the health risks of working with this chemical in a manufacturing plant.
1. What is Chlorosulfuric acid?
Chlorosulfuric acid, with the chemical formula HSO₃Cl, is an important inorganic compound in the chemical industry, widely used in the production of detergents, dyes, and other organic compounds.
In terms of molecular structure, HSO₃Cl has a tetrahedral shape, with the sulfur (S) atom bonded to three oxygen (O) atoms and one chlorine (Cl) atom. This structure allows chlorosulfuric acid to be a strong acid with high reactivity towards many other substances.
Under normal conditions, chlorosulfuric acid is a colorless liquid, but commercial samples are often light brown or straw-colored. It is very hygroscopic and is a strong irritant, especially upon contact with the skin and eyes.
Chlorosulfuric acid is primarily produced through the reaction between hydrogen chloride (HCl) gas and a solution of sulfuric acid (H₂SO₄) containing SO₃. This process creates chlorosulfuric acid and sulfuric acid.
With its special chemical properties, chlorosulfuric acid plays an important role in the synthesis of organic compounds, especially in the sulfonation of organic compounds to produce sulfonic acids, an important group of compounds in the pharmaceutical and chemical industries.
| No. | Chemical Name in Vietnamese | Chemical Name in English | HS Code | CAS Number | Chemical Formula |
| 1. | Axit clo sunfunic | Chlorosulfuric acid | 28062000 | 7790-94-5 | ClHSO3 |
See more: chemical safety training service according to Decree 113/2017/ND-CP
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2. Where does Chlorosulfuric acid originate from in the production process?
In industrial production processes, the source of this chemical mainly comes from activities involving the processing and handling of compounds containing sulfur and chlorine. It is created in chemical manufacturing plants where sulfuric acid and hydrogen chloride (HCl) gas are combined. This process takes place under strict control to obtain a high-quality product, but it also poses a risk of release if the production steps are not carried out correctly.
This chemical can appear in stages such as sulfonation, the production of detergents, dyes, or in other chemical processes related to the handling and production of organic compounds. Due to its properties, release can occur during stages like packaging, storage, or in unfortunate situations during transportation.
In addition, chemical manufacturing facilities may emit small amounts into the air or the surrounding environment in cases of non-compliance with safety procedures. These sources, although often not large, can directly affect workers and the community if there are no effective protection and control measures.

3. Industries that use Chlorosulfuric acid in production
This chemical is widely used in many different industries thanks to its special properties. In the chemical industry, it plays an important role in the sulfonation process, a method used to produce sulfonic compounds, which have applications in many products such as detergents, dyes, and preservatives. These sulfonic compounds are also important components in the pharmaceutical and catalyst industries for the petroleum sector.
In the pharmaceutical industry, this chemical is used in the synthesis of organic compounds with high pharmacological properties. It is also used in the processing and production of dyes, as its ability to create sulfonic groups helps to improve the stability and compatibility of dyes with other materials.
Besides that, in the plastics manufacturing industry, this chemical is also used to produce sulfonated plastics, which serve applications in medical devices, food packaging, and building materials. Companies that produce detergents, especially soaps and industrial cleaners, also use this chemical to improve the cleaning ability and stability of the product.
In addition, this chemical is also used in other industries such as fertilizer production, rubber compound manufacturing, and in wastewater treatment processes, thanks to its strong cleaning and bleaching capabilities.
4. How does Chlorosulfuric acid affect workers?
Exposure to this chemical can cause many adverse effects on the health of workers, especially without proper safety measures. First, this chemical is highly corrosive and can cause severe burns upon direct contact with the skin or mucous membranes. When its vapors enter the respiratory system, they can cause airway irritation, coughing, shortness of breath, and in severe cases, can lead to long-term lung or respiratory problems.
This chemical can also cause severe eye damage if not adequately protected, with symptoms such as redness, a burning sensation, and in cases of long-term exposure, can lead to blindness. When in contact with the eyes or skin, this chemical not only causes burns but can also cause deep damage to cellular tissues.
In addition, workers may also experience digestive problems if they accidentally ingest this chemical, with symptoms such as nausea, vomiting, abdominal pain, and it can cause serious damage to the stomach and intestines. This chemical can also affect other organs in the body with long-term or high-concentration exposure, causing endocrine disorders or a decline in organ function.
Long-term exposure to the vapor or fumes of this chemical can also reduce the body’s immune capacity, making workers more susceptible to infections or other diseases.
5. Permissible safe concentration of Chlorosulfuric acid for human exposure
Currently, there is no specific information on the permissible safe concentration for exposure to this chemical in available reference materials. However, according to Decree 108/2008/ND-CP guiding the Law on Chemicals, mixtures containing chemicals with acute toxicity, causing burns or skin corrosion, or capable of causing serious damage to mucous membranes at a content of 1% or more must have a chemical safety data sheet.
To ensure the safety of workers when exposed to this chemical, it is necessary to comply with occupational safety regulations, including the use of appropriate personal protective equipment, ensuring good ventilation in the work area, and adhering to guidelines for chemical handling and storage.

On a basic level, when working in an industrial environment, it is important to comply with safety standards and limit exposure to Chlorosulfuric acid. Organizations such as the Occupational Safety and Health Administration (OSHA) in the United States provide guidelines and safety principles to protect workers from the negative effects of chemical substances.
6. Measures to minimize the effects of Chlorosulfuric acid on worker health
To minimize the effects of this chemical on worker health, safety and protection measures must be strictly implemented throughout the production process. First, the use of personal protective equipment is mandatory, including gloves, safety goggles, chemical-resistant respirators, and protective clothing. This equipment helps prevent direct contact with the chemical, minimizing the risk of skin burns and eye damage, while also protecting the respiratory system from inhaling chemical vapors.
Second, improving the ventilation system in the work area also plays an important role in reducing the concentration of toxic gas in the air. Using a forced ventilation system to exhaust toxic gas and supply fresh air can help minimize long-term exposure to chemical vapors. These workspaces must be maintained with high ventilation to avoid the accumulation of harmful gases.
In addition, training and educating workers about the risks of working with this chemical is very important. Workers need to be equipped with knowledge on how to handle, store, and transport the chemical according to proper procedures to avoid risky situations. Training programs must include first aid measures in case of an accident, to help workers quickly handle the situation and minimize health damage.
Finally, checking and maintaining protective equipment, ventilation systems, as well as safety procedures is necessary to ensure the work environment always meets safety standards. These measures not only help to minimize the adverse effects on workers’ health but also contribute to creating a safe and sustainable work environment.
Occupational safety training: Workers need to be trained and educated about the risks and safety measures when working with this type of chemical. This training should be provided periodically and regularly to ensure understanding and proper adherence to safety rules.
Periodically organize workplace environmental monitoring in factories and enterprises, collecting and analyzing factors harmful to workers, and from there, adjusting to reduce the level of harm to prevent occupational diseases for them.
7. National Workplace Environmental Monitoring Center
Nam Viet’s Workplace Environmental Monitoring Center is a professional unit for monitoring and measuring the quality of the working environment across all provinces in Vietnam. With a team of experienced monitoring specialists, the center uses modern measuring equipment, ensuring accuracy and reliability.
REGISTER FOR WORKPLACE ENVIRONMENTAL MONITORING SERVICE
In addition to providing monitoring services, the center also supports customers in planning, handling, and tracking workplace environmental issues. With the motto “the customer is the center,” the center is concerned with customer satisfaction, meeting all customer needs, and is committed to providing the best solutions for businesses.
With investment in technology, engineering, and human resources, Nam Viet’s monitoring center has become one of the reputable units in the field of workplace environmental monitoring in Ho Chi Minh City with the following objectives:
- We always value our brand reputation and the quality of our products and services.
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- Along with a team of experienced Masters and Engineers with a desire to protect the environment and benefit businesses.

- Coming to the Nam Viet Environmental Monitoring team, your company will receive professional service with experts in the field of monitoring. At the same time, you will get the best cost incentives.
8. Quotation for Workplace Environmental Monitoring
To help businesses carry out workplace environmental monitoring in a professional and effective manner, Nam Viet provides our customers with a quality and reasonably priced quotation for workplace environmental monitoring services.
- Our quotation provides detailed information on the prices of the monitoring services we offer. This includes costs related to travel, measurement, analysis, and reporting of results. You can be completely confident in the accuracy and reliability of the monitoring result reports we provide.
- We are committed to always offering the most competitive and reasonable prices on the market, and we are also always ready to provide consultation and answer any questions about monitoring services in the quickest and most professional manner.
- With Nam Viet’s quotation, you can easily choose the service packages that suit your needs. We are committed to bringing you the highest satisfaction with our professional service quality.

