Sulfonyl
chemicals

OVERVIEW

VARSAL’s Sulfonyl chemical products are made at Varsal ISO, GMP and ChemStewards® compliant facilities.

We custom manufacture other sulfonyl chemicals upon request. Please contact us for specific inquiries.

Methanesulfonic Acid (MSA)

  • Other names: Methylsulphonic Acid
  • Molecular weight: 96.10
  • Appearance: colorless and transparent oil liquid 
  • CAS#: 75-75-2
  • Notes: soluble in water; insoluble in paraffin

As a solvent, catalyst of alkylation, esterification and polymerization.

  • Electronics
  • Pharmaceutical
  • Specialty Industrial

Varsal’s MSA process is clean with no methyl mercaptan odor, and our process conditions do not typically allow formation of methyl esters. It is approved for use in all major tin-lead applications, and low oxidizables and chlorides ensure long life, stable solder deposits. Varsal’s clean process promotes “Green Chemistry” with less environmental impact from sludge. It also provides superior throwing power to allow high-speed tin-lead alloy plating in reel-to-reel operations.

We offer a variety of different grades, and can customize to your specific technical requirements.

  • Methanesulfonic Acid, 70% Special Grade
  • Methanesulfonic Acid, 70% Industrial Grade
  • Methanesulfonic Acid, 85%
  • Methanesulfonic Acid, Anhydrous Pharma Grade
  • Methanesulfonic Acid, Anhydrous Special Grade
  • Methanesulfonic Acid, Anhydrous Industrial Grade

Methanesulfonic Anhydride (MSA, Anhydride)

  • Other names: Methylsulphonic Acid, anhydride; Mesic anhydride
  • Molecular weight: 174.20
  • Appearance: light gray crystals
  • CAS#: 7143-01-3
  • Notes: corrosive and moisture sensitive

Used as an intermediate for various reasons, including to generate mesylates (methanesulfonyl esters) in aromatic alkylation reactions. It can be reacted with dimethylsulfoxide to obtain sulfoxonium complexes, which are useful oxidizing agents.

  • Pharmaceutical
  • Industrial

Varsal’s MSA Anhydride has extremely high purity with low residual impurities, leading to maximal yield and product quality for Varsal’s customers. Varsal has extensive expertise in logistics and packaging considerations when handling corrosive and moisture-sensitive products.

Trifluoromethanesulfonic ACID (Triflic ACID)

  • Other names: TFMS, TFSA, HOTf or TfOH
  • Molecular weight: 150.07
  • Appearance: colorless to yellowish liquid
  • CAS#: 1493-13-6

 

As a catalyst of alkylation, esterification and polymerization.

  • Pharmaceutical
  • Industrial

Varsal’s triflic acid is made through a very clean manufacturing process and has extremely high purity with low residual impurities, leading to maximal yield and product quality for Varsal’s customers. Varsal has extensive expertise in logistics and packaging considerations when handling corrosive products.

Trifluoromethanesulfonic ANHYDRIDE (Triflic ANHYDRIDE)

  • Other names: TF2O
  • Molecular weight: 282.13
  • Appearance: colorless to yellowish liquid
  • CAS#: 358-23-6

 

As a catalyst of alkylation, esterification and polymerization.

  • Pharmaceutical
  • Electronics

Varsal’s triflic anhydride is made through a very clean manufacturing process and has extremely high purity with low residual impurities, leading to maximal yield and product quality for Varsal’s customers. Varsal has extensive expertise in logistics and packaging considerations when handling corrosive products.

Tin Methanesulfonate (Sn-MSA)

  • Other names: Stannous methanesulfonate, Stannous methylsulfonate
  • Molecular weight: 308.88
  • Appearance: colorless to yellowish liquid
  • CAS#: 53408-94-9

Used as an electrolyte in metal-finishing, primarily as a replacement for tin sulfate where high speed, reel-to-reel deposits are needed.

  • Electronics

Varsal offers both regular and low acid Sn-MSA at 300 g/L. Varsal also offers Sn-MSA at 400 g/L concentration. Varsal can custom manufacture low Pb or Pb-free Sn-MSA, and vary the free acid content of sulfonate solutions for specific plating tank requirements. Varsal can control the Pb and Fe specification, as well as the “Low Alpha” lead for sensitive electronic semiconductor applications.

  • Tin(II) Methane Sulfonate Solution
  • Tin(II) Methane Sulfonate Solution-Low Acid
  • Tin(II) Methane Sulfonate Solution-Low Lead
  • Tin(II) Methane Sulfonate Solution-Lead Free
  • Tin(II) Methane Sulfonate Solution, 400 g/L
  • Tin(II) Methane Sulfonate Solution, 400 g/L, Zero Acid

Lead Methanesulfonate (Pb-MSA)

  • Other names: Plumbous methanesulfonate
  • Molecular weight: 397.38
  • Appearance: colorless liquid 
  • CAS#: 17570-76-2
  • Notes: Non-irritant

Electrolyte in metal-finishing.

  • Electronics
  • Industrial

Varsal offers Pb-MSA at concentrations ranging from 300 g/L to 500 g/L, and can customize to your specific technical requirements.

  • Lead(II) Methane Sulfonate Solution, 500 g/L
  • Lead(II) Methane Sulfonate Solution, 450 g/L
  • Lead(II) Methane Sulfonate Solution, 400 g/L
  • Lead(II) Methane Sulfonate Solution, 350 g/L
  • Lead(II) Methane Sulfonate Solution, 300 g/L

 

Other Methanesulfonate Salts (MSA-Salts)

Typical products include Cu(II) Methane Sulfonate Solution (CAS# 54253-62-2), Silver Methane Sulfonate Solution (CAS# 2386-52-9), Ni(II) Methane Sulfonate Solution (CAS# 55136-38-4), and Bi(III) Methane Sulfonate Solution (CAS# 82617-81-0).

Electrolyte in metal-finishing; Silver methane sulfonate solution is used for high heat automotive applications.

  • Electronics
  • Industrial

Varsal custom manufactures other MSA salts per customer request. Some of the typical ones are listed in the Grades Offered section. For other inquiries, please contact us to learn more!

  • Cu(II) Methane Sulfonate Solution
  • Silver Methane Sulfonate Solution
  • Ni(II) Methane Sulfonate Solution
  • Bi(III) Methane Sulfonate Solution

Methanesulfonyl Chloride (MSC)

  • Other names:  mesyl chloride
  • Molecular weight: 114.54 
  • Appearance: colorless to pale yellow liquid
  • CAS#: 124-63-0
  • Notes: toxic, corrosive, inhalation hazard

Used as a building block for agricultural and pharmaceutical chemicals. MSC dissolves in polar organic solvents but is reactive toward water, alcohols, and many amines. The simplest organic sulfonyl chloride, it is used to make methanesulfonates and to synthesize sulfene.

  • Pharmaceutical
  • Personal Care
  • Agricultural

Varsal’s MSC is made from the chlorination of DMDS. The manufacturing process is clean, with no methyl mercaptan odor and no detectable impurities of methyl methane thiosulfonate. In formulations, it is both harmless to humans and has impurity cleansing capabilities. Thus, MSC is ideal for pharmaceutical, flavors and fragrance, and other applications where these characteristics are important.

Varsal has extensive expertise in logistics, packaging and storage considerations when handling corrosive, toxic and inhalation hazard products.

Methanesulfonamide (MSAM)

  • Other names: aminosulfane dioxide, mesylamine, methanesulphonamide
  • Molecular weight: 95.12
  • Appearance: white powder or crystals
  • CAS#: 3144-09-0

Used as a pharmaceutical intermediate.

  • Pharmaceutical

Varsal’s MSAM is made through a very clean manufacturing process and has extremely high purity with low residual impurities, leading to maximal yield and product quality for Varsal’s customers.

DIMETHYL DISULFIDE (DMDS)

  • Other names: Methyl disulfide
  • Molecular weight: 94.20
  • Appearance: pale, yellow liquid
  • CAS#: 624-92-0

DMDS is the simplest disulfide and used in a variety of applications. Representative uses are below:

  • As a sulfiding agent in the refinery process
  • For the protection of steam cracking coils against the formation of coke in petrochemical facilities
  • Blended with thiophene to impart gassy odor for petrochemical plant safety
  • As a soil fumigant in agriculture
  • As a food additive to substitute 2-methylfuran acrolein 

Advantages of DMDS versus other sulfiding agents include high sulfur content, lower toxicity, lowest total cost, low decomposition temperature, and two-step decomposition.

  • Oil & Gas
  • Agriculture
  • Food
  • Downstream chemical production

Varsal’s DMDS is made from dimethyl sulfate, and this route is cleaner than the competing, highly dangerous and volatile methyl mercaptan process. Varsal’s DMDS is a purer product than other products in the market, which are more suitable as sulfiding agents in petrochemical cracker management. 

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