Method for continuously synthesizing PPS-OH

Abstract

The invention discloses a method for continuously synthesizing PPS-OH. The method comprises the following steps of adding a phase transfer catalyst and sodium sulfite into a hydrosulfite solution or pyrosulfite solution of alkali metal, so as to obtain a mixed solution containing HSO3<->; simultaneously adding the mixed solution and epichlorohydrin into a first reactor, and generating ring-openingreaction; simultaneously adding a mixed solution of pyridine and a catalyst and a ring-opening reaction product into a second reactor, and reacting to obtain a target product. The method has the advantages that the mixing order and adding order of the raw materials are changed, and the raw materials participating in reaction are simultaneously sent into the corresponding reactor to participate inthe corresponding reaction, so that the generation of side effect is effectively reduced, the selectivity and the conversion rate of reaction are improved, the yield rate and purity of the product are improved, and the requirement of high-end customers in the electroplating industry are met; compared with the intermittent operation of the traditional technology, the reaction time is shortened, the production efficiency is improved, and the method is suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a method for continuously synthesizing pyridinium hydroxypropanesulfonate. Background technique [0002] Hydroxypropanesulfonic acid pyridinium salt (referred to as PPS-OH), it is an electroplating intermediate, the molecular formula is: C 8 h 11 NaO 4 S, molecular weight: 217.24, CAS number: 3918-73-8, pure product is white crystal, most of its commercially available products are colorless to light yellow liquid with content between 40-50% and pH value between 3-5 . PPS-OH has excellent brightening and leveling effects in nickel electroplating, especially in high current density areas. As a basic additive in the nickel plating bath, its dosage is 50-500mg / L, and its consumption is 20-50g / kAH. Due to the demand for anti-corrosion and decorative functions, its market demand is large. [0003] At present, the industrial synthesis method of PPS-OH is the normal-pressu...

AI Technical Summary

Problems solved by technology

However, at present, the synthesis of PPS-OH is carried out intermittently in traditional reactors. The production efficiency is low, and the subsequent separation process is cumbersome.

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