A kind of synthetic method of hydroxypropanesulfonic acid pyridinium salt

Abstract

The invention relates to a synthetic method of pyridinium hydroxy propyl sulfobetaine. The synthetic method comprises the following steps: sufficiently dissolving hydrosulphite or pyrosulfite in water at normal temperature, adding sodium sulfite as an auxiliary sulfonating agent to adjust the pH value of the system to be 5.2-5.5, and then adding polyether F-6 as a catalyst; then adding a complexing agent, controlling the environment conditions, adding epichlorohydrin, and carrying out loop-opening reaction to obtain 3-chloro-2-hydroxy propanesulfonate; adding pyridine to the system, controlling the temperature to carry out reflux reaction, adding triethylamine as an impurity removing agent, reacting for 1 hour, then dehydrating and decoloring, adjusting the pH to 2-5, and adding 4-hydroxyl-2, 2, 6, 6-tetramentylniperidine-1-oxygen radical as a stabilizer and a vitamin C derivative to obtain an aqueous solution of the pyridinium hydroxy propyl sulfobetaine. The pyridinium hydroxy propyl sulfobetaine synthesized by the synthetic method is produced by adopting a one-pot method, which accords with the electroplating industry development demands at present; the pyridinium hydroxy propyl sulfobetaine is low in impurity content, good in appearance and low in production cost.

Description

technical field [0001] The invention belongs to a new method for preparing nickel-plating intermediate hydroxypropanesulfonic acid pyridinium salt, which is an electroplating additive with bright and excellent leveling performance in the high current density area Background technique [0002] Hydroxypropanesulfonic acid pyridinium salt is an electroplating intermediate, the pure product is a white crystal, and the common one is a colorless to light yellow liquid product with a content of 40%-50% and a pH value of 3-5. CAS number: 3918-73-8, molecular formula: C 8 h 11 NaO 4 S, molecular weight: 217.24. [0003] Pyridinium hydroxypropanesulfonate (PPS-OH) has excellent brightening and leveling effects in nickel plating, especially in high current density areas. As a basic additive in the nickel plating bath, its consumption is 20-50g / kAH, and the dosage is 50-500mg / L, and the market demand is large. At present, the liquid products of pyridinium hydroxypropanesulfonate (P...

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Problems solved by technology

[0013] After HPLC analysis, it is found that the impurity content is relatively high, which shows that the coating is brittle and dark in electroplating applications; secondly, the high impurity content has a greater impact on the color of the product, which means that the produced product is darker and lighter than foreign products. Yellow to yellow; the products produced according to the above method are prone to discoloration after being placed for a long time, showing red / yellow; in the above scheme, the amount of pyridine is large and recovery is difficult, resulting in serious waste of raw materials

[0014] Today, as the nickel plating industry develops more and more refined, it is difficult to produce high-end refined products that can meet the needs of the industry through the above synthetic routes

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