Zhishang Chemical

Welcome to Zhishang Chemical      +86-176 5311 3209     Simon@sdzschem.com

Zhishang Chemical
Close this search box.

Sulfamic Acid CAS 5329-14-6

Molecular Formula: H3NO3S

Formula Weight: 97.09

ZSpharmac: Sulfamic Acid Supplement

Product Name: Sulfamic Acid
CAS No: 5329-14-6
Purity: 99%

Basic Info

Product Name:Sulfamic Acid
Other Names:SulfaMic Acid, Reagent, ACS
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Pharmaceutical, Pesticide and Dye Intermediates
Appearance:White Crystals or Crystalline Powder
EINECS No.:226-218-8
Storage:Store below +30°C. 
Provide:Sulfamic Acid MSDS;
Sulfamic Acid COA

What is Sulfamic Acid?

Sulfamic acid is a colorless, odor-free as well as safe solid strong acid. Its liquid service has the exact same strong acid residential or commercial properties as hydrochloric acid and sulfuric acid, yet its corrosiveness to metals is much lower than that of hydrochloric acid. The toxicity is extremely small, but it must not be in contact with the skin for a long time, and it needs to not go into the eyes. As a result of its strong acid residential properties, it is also called strong sulfuric acid, which can replace sulfuric acid to make incredibly pure crystals that are steady at room temperature, and also its packaging, storage as well as transportation are very practical. Strong sulfamic acid has good security in completely dry space temperature level atmosphere, non-hygroscopic, non-volatile, soluble in water, ionized in liquid remedy, reasonably acidic, and can be used as an acid conventional option for alkali titration. Slightly soluble or insoluble in organic solvents, insoluble in ether, soluble in fluid nitrogen, ethanol, formamide and also acetone. Due to its superb homes, it is extensively made use of in pickling agents, chlorine stabilizers, sulfonating agents, denitration representatives, disinfectants, flame retardants, herbicides, artificial sweeteners and catalysts.

氨基磺酸 结构式

Sulfamic acid aqueous solution has a slow effect on the corrosion products of iron. Some sodium chloride can be added to slowly generate hydrochloric acid, thereby effectively dissolving iron scale. It is suitable for removing the surface of equipment made of iron, steel, copper, stainless steel and other materials. of scale and corrosion products. Sulfamic acid aqueous solution is the only acid that can be used for cleaning the surface of galvanized metal. The temperature during cleaning is generally controlled at not more than 66°C (to prevent the decomposition of sulfamic acid), and the concentration is not more than 10%. The production process of sulfamic acid is simple, the reaction is easy to control, the raw materials and equipment are easy to solve, the waste water is also easy to deal with, and the by-products can be effectively utilized.

Sulfamic Acid Properties:

Melting point 215-225 °C (dec.) (lit.)
Boiling point -520.47°C (estimate)
density 2.151 g/cm3 at 25 °C
refractive index 1.553
storage temp. Store below +30°C.
solubility water: soluble213g/L at 20°C
form Crystals or Crystalline Powder
color White
PH1.2 (10g/l, H2O)
Water Solubility 146.8 g/L (20 ºC)


Sulfamic Acid Uses

  1. Sulfamic acid as a lightening help. It can minimize or remove the catalytic effect of heavy metal ions in the whitening liquid, so as to make certain the quality of the bleaching fluid and lower the oxidative degradation of steel ions to fibers. It can also prevent the peeling off reaction of fibers and enhance the toughness as well as brightness of the pulp. When applying, take care not to place it straight into the lightening remedy, but first dissolve it in water and after that placed it right into the whitening remedy.
  2. Sulfamic acid works as herbicides, fire resistants, softeners for paper as well as fabrics, steel cleaning agents, and so on.
  3. Requirement for sulfamic acid titration approach; facility covering up representative; standard for the determination of nitrogen and also sulfur by natural microanalysis.

Sulfamic Acid Chemical Reaction

Sulfamic acid is a strong acid that reacts with many basic compounds. It is heated to above the melting point (209°C) under normal pressure to begin to decompose, and continues to be heated to above 260°C to decompose into sulfur trioxide, sulfur dioxide, nitrogen, hydrogen and water.
(1) Sulfamic acid can react with metals to form transparent crystalline salts. Such as: 2H2NSO3H+Zn→Zn(SO3NH2)2+H2.
(2) Can react with metal oxides, carbonates and hydroxides:
1. FeO+2HSO3NH2→Fe(SO3NH2)2+H2O
2. CaCO3+2HSO3NH2→Ca(SO3NH2)2+H2O+CO23, Ni(OH)2+2HSO3NH2→Ni(SO3NH2)2+H2O.
(3) Can react with nitrate or nitrite: 1, HNO3+HSO3NH2→H2SO4+N2O+H2O2, HNOChemicalbook2+HSO3NH2→H2SO4+N2+H2O.
(4) Can react with oxidants (such as potassium chlorate, hypochlorous acid, etc.):
1, KClO3+2HSO3NH2→2H2SO4+KCl+N2+H2O
2, 2HOCl+HSO3NH2→HSO3NCl2+2H2O.
(5) Can react with thionyl chloride: SOCl2+HSO3NH2→H2NSO2Cl+HCI+SO2. (6) Can react with iodine and alkali metal iodides: 2HSO3NH2+3CsI+H2O→CsI3+Cs2SO4+(NH4)2SO4.
(7) Can react with hydroxyl compounds (including phenol): C2H5OH+HSO3NH2→C2H5OSO2ONH4.
(8) Sulfamic acid can also react with amino compounds: C2H5NH2+HSO3NH2→C2H5NH2SO3NH2.

Summary of the Invention of Sulfamic Acid

In order to solve the problems such as material filtration difficulty and paste transfer difficulty existing in the prior art of sulfamic acid production technology, the present invention proposes a more concise and rapid post-treatment process.
The present invention adopts conventional methods to prepare sulfamic acid. The so-called conventional method refers to the method in which urea is sulfonated with oleum to produce sulfamic acid. For those skilled in the art, its preparation method can be known from a number of references such as charging ratio, reaction conditions and operation steps and the like. The creative contribution made by the present invention is to provide a new post-processing process, which enables people to abandon the post-processing methods reported in the previous literature, and adopts a new post-processing method that does not require multiple material transfers and special equipment, and can obtain high-quality, high yield of the desired product.
The technical scheme of the sulfamic acid production technique provided by the invention is as follows:
After the reaction, add dilute sulfuric acid with a concentration of 5-30% to adjust the concentration of sulfuric acid in the reactor to between 60-75%, and separate the upper layer sulfuric acid after standing; then add dilute sulfuric acid with a concentration of 1-10% or water, adjust the sulfuric acid concentration in the kettle to between 5-20%, recrystallize, filter and dry to obtain the high-purity target product.
According to the post-treatment process of the present invention, after the reaction is completed, the temperature of the first material is lowered to 40°C. About C, carry out the first acidity adjustment treatment by adding dilute sulfuric acid. The preferred concentration of dilute sulfuric acid added to the reactor this time is about 10-25%. Because in actual production, the concentration of the filtrate obtained by filtration after recrystallization of the product is just within this range, and it can be recycled and used for adjusting the acidity this time. The concentration of the first acidity adjustment is preferably between 65-70%. At room temperature, the solubility of sulfamic acid in 70% sulfuric acid is extremely small, and the difference in specific gravity between the two is relatively large. Therefore, when the acidity is adjusted properly, stirring is stopped, and after standing for a while, although the sulfamic acid particles precipitated from 70% sulfuric acid are very fine. Difficult to filter, but can settle down faster. Using this feature, the sulfuric acid in the upper layer can be easily separated (with almost no entrained product). In actual operation, a movable pipe with a suitable opening position can be used to extract this part of sulfuric acid (about 70% of the total sulfuric acid in the kettle) from the upper part of the reaction kettle. The extracted sulfuric acid (concentration about 70%) can be sold to other manufacturers as a by-product.
After that, the material in the kettle can be directly recrystallized without transferring. The specific operation method is as follows: first, carry out the second acidity adjustment, add dilute sulfuric acid with a concentration of 1-10% or directly add water, adjust the sulfuric acid concentration in the kettle to not more than 20%, and control the appropriate acid concentration between 5-20% . If the concentration is higher than 20%, the quality of the product will decrease; if the concentration is lower than 5%, the amount of waste acid will increase and the cost of treatment of the three wastes will increase. In actual production, the amount of dilute sulfuric acid used for the second acidity adjustment or water is that the weight ratio of sulfamic acid and dilute sulfuric acid or water is between 1: 2-1: 7, so that both can guarantee to obtain high-quality product, and The amount of waste acid can be effectively controlled. Heating to make the sulfamic acid completely dissolved, pay attention to the temperature should not exceed 75 °C. After that, the temperature is lowered to precipitate sulfamic acid crystal particles. Filtration and drying were carried out to obtain aminosulfonic acid with a purity of more than 99.5%, and the yield was about 85%.
The post-treatment process of the present invention has the following advantages: the acid discharge and refining operations in the sulfamic acid production process are arranged
Carry out in the same reaction kettle, thoroughly solve many problems such as high labor-intensity transfer material, multiple filtration, multiple recrystallization purification or use of pressurized equipment to increase production cost in the prior art. Only one filter is required in the post-processing operation, and is
Because of the good crystal form of the product, the filtering operation is very easy. Using conventional equipment, filtering 850 kg of product can be completed in 0.5 to 1 hour. Therefore, the post-processing process provided by the present invention is easy to operate, low in labor intensity of workers, high in product yield and good in quality. At the same time, 70% sulfuric acid with a concentration of 70% can be recovered to the maximum extent for sale as a by-product, and most of the dilute sulfuric acid can be recycled and applied.

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food Additives
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

Get Sulfamic Acid Quotation