p-Toluenesulfonic acid CAS 104-15-4
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- Appearance: Colorless liquid
- Assay: 99. 0%min
- Stock: In stock
- Sample: Available
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p-Toluenesulfonic acid: The Complete Guide
p-Toluenesulfonic acid for Sale
Basic Info of p-Toluenesulfonic acid
Oluene-4-sulfonicaci; Para toluene sulfonic acid; Tosic acid; Paratoluenesulfonic acid; Para toluenesulfonic acid anhydrous; p-Toluenesulfonic acid monohydrate
Pharmaceutical raw materials; Pharmaceuticals, pesticides, dyes, synthetic material intermediates; Flavors and fragrances; Inorganic salts; Catalysts and auxiliaries
What is p-Toluenesulfonic acid?
P-Toluenesulfonic acid (its molecular framework formula is p-CH3C6H4SO3H, additionally called TsOH, English name is p-Toluenesulfonic acid), referred to as PTS, is a non oxidizing organic acid, white needle or powder crystal, soluble in water, alcohol, ether as well as other polar solvents. It is simple to deliquescence, dry out and carbonize timber as well as cotton textiles, and also is insoluble in benzene and also toluene. P-cresol is developed throughout alkali melting. Typically, it is preferred to utilize p-toluenesulfonic acid monohydrate (TsOHH2O) or tetrahydrate (TsOH4H2O).
In the industrial prep work of methyl p-cresolic acid, concentrated sulfuric acid p-toluenesulfonic acid is utilized for toluene sulfonation. The prepared p-toluenesulfonic acid typically contains benzene sulfonic acid and also sulfuric acid contaminations, which can be detoxified by recrystallization with concentrated hydrochloric acid and azeotropic drying.
P-Toluenesulfonic acid is commonly used as driver, coating intermediate as well as material curing agent in the synthesis of medication, chemical, polymerization stabilizer and natural synthesis (esters, and so on). It is also an acid catalyst commonly made use of in organic synthesis. Reduce the effects of with salt hydroxide to acquire sodium p-toluenesulfonate, and after that respond with phosphorus pentachloride to obtain p-toluenesulfonyl chloride. The latter is made use of in nucleophilic replacement reaction, as well as likewise as alcohol hydroxyl shielding team. p-CH3C6H4SO3Na + PCl5 → p-CH3C6H4SO2Cl 。.
Making use of p-toluenesulfonic acid additionally militarizes the security of dihydrofuran to alcohol, carboxylic acid esterification, ester exchange response, and also aldehyde to acetal.
p-Toluenesulfonic acid Uses
- It is utilized as chemical reagent, dye and natural synthesis.
- p-Toluenesulfonic acid is used as an intermediate of medicine (such as doxycycline), chemical (such as dicofol) and dye. It is additionally made use of in detergents, plastics, layers, etc.
- It is utilized in medication, pesticides, dyes and cleaning agents, in addition to plastics and printing finishes.
- p-Toluenesulfonic acid is extensively used as a stimulant for the synthesis of drugs, chemicals, polymerization stabilizers and natural synthesis (esters, etc). It is also used as medication, repaint intermediate as well as material curing agent.
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Application of p-Toluenesulfonic acid
In a wide range of reactions, including acylation, acetalization, dehydration, alkylation, dealkylation, Beckmann rearrangement, polymerization, and depolymerization, it is as effective as, but better than, sulfuric acid. Because it does not cause side reactions such as oxidation or char formation, the resulting product is highly pure and light in color.
- Organic Synthesis
Commonly used p-toluenesulfonic acid to manufacture p-toluenesulfonamide, saccharin, chloramine T, p-toluenesulfonyl chloride and p-aluminium diaminophthalamide. The largest use of p-toluenesulfonic acid is in the production of p-cresol.
In industry, p-toluenesulfonic acid and zinc oxide are commonly used to prepare zinc p-toluenesulfonate. In the copolymerization process of acrylonitrile and methyl acrylate or acrylonitrile and vinylidene chloride, zinc p-toluenesulfonate can be used as a stabilizer, and its dosage can reach 0.2%. p-toluenesulfonic acid can also be used in phenolic, epoxy and aminoplastics, furniture varnishes, dyes, adhesives, synthetic anti-diabetic medicines and anti-stress additives for electroplating baths. With the introduction of one-step acrylic and acrylic units, the demand for high-quality p-toluenesulfonic acid as a stabilizer is growing rapidly.
Preparation of p-Toluenesulfonic acid
In industry, p-toluenesulfonic acid (tsoh) is prepared by the method of sulfonating toluene. The sulfonating agents that can be used are sulfuric acid (including concentrated sulfuric acid and oleum), sulfur trioxide and chlorosulfonic acid. From the sulfonation speed From the above, the higher the concentration of the sulfonating agent, the better (such as pure sulfur trioxide or oleum written with “), but too high a concentration will cause side reactions such as polysulfonation, oxidation, and formation of maple. It can affect the position where the sulfo group enters the benzene ring. Therefore, the appropriate sulfonation conditions must be selected according to the type and concentration of the sulfonating agent.
Theoretically, sulfur trioxide is the most effective sulfonating agent because it is directly added without removing the water produced by the reaction. Under suitable conditions, the product is almost exclusively p-toluenesulfonic acid. At present, the preparation of p-toluenesulfonic acid by sulfonation of toluene with sulfur trioxide is very common in foreign countries. According to reports, when toluene is sulfonated with gaseous sulfur trioxide in the liquid phase at 45~55°C, the product contains 20% xylene sulfonic acid, the isomer contains 85% p-toluenesulfonic acid, 9% o-toluenesulfonic acid and 6% m-toluenesulfonic acid. Experiments show that the dehydrating agent PZO. In the presence of sodium sulfide, m-toluenesulfonic acid cannot be obtained, and if sulfonation is carried out in the presence of sodium sulfide, the amount of vanadium produced is greatly reduced.
Some people use air-containing sulfur trioxide gas to sulfonate excess toluene, and the resulting p-toluenesulfonic acid only contains no more than 0.49% of other isomers and no more than 1.5% of sulfuric acid and sulfuric acid. .1% or less of xylyl alum. The advantage of sulfonating toluene with sulfur trioxide is that the reaction temperature is low, the speed is fast, and the stoichiometric feeding is used to obtain almost pure p-toluenesulfonic acid.
- p-Toluenesulfonic acid – WikiPedia
- Kirk-othmer, Eneyelo with diaofChemiealTeehnol-ogy, and Edition.Vol.2(), 273~278 P.H. Groggins, Chemical Organic Synthesis Unit Process, 16. ~211, Fuel Chemistry Press
p-Toluenesulfonic acid Suppliers and Manufacturers
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