System and process for continuously producing diazonium salt solution

Abstract

The invention discloses a system and a process for continuously producing a diazonium salt solution. The system comprises conveying equipment, feeding equipment, a premixing kettle, a diazotization reactor and a finished product kettle which are connected in sequence, the diazotization reactor is a supergravity reactor, a multi-channel structure rotating bed is adopted, channels are arranged in astaggered mode, and connecting nodes between the channels are expanded to form a spherical cavity. The process adopts the system and comprises the following steps: (1) uniformly mixing aromatic amineand a diazotization reagent in the premixing kettle, continuously feeding the aromatic amine into the premixing kettle through conveying equipment and feeding equipment under continuous stirring, anddirectly and continuously conveying the diazotization reagent into the premixing kettle at the same time; and (2) continuously feeding and simultaneously continuously discharging the materials from the premixing kettle, enabling the discharged materials to partially flow back to the premixing kettle and partially enter the diazotization reactor, enabling the aromatic amine and the diazotization reagent to fully react, and continuously discharging the diazonium salt solution generated by the reaction to the finished product kettle.

Description

technical field [0001] The invention relates to the technical field of preparation of diazonium components of dyes, in particular to a system and process for continuous production of diazonium salt solution. Background technique [0002] The reaction of aromatic primary amines and nitrous acid (in a strong acid medium) to generate diazonium salts is called diazotization, and the product diazonium salts are widely used in organic synthesis processes such as dyes and medicines, especially in the dye industry, with more than 60% The product is realized by diazotization reaction. [0003] At present, in industrial production, the diazotization reaction mainly adopts the nitrosyl sulfuric acid batch process, that is, in the batch reactor, add nitrosyl sulfuric acid (sometimes need to add more than 80% sulfuric acid solution), and then slowly add aromatic amine . In this process, manual feeding is used, the control is not precise enough, and there are problems such as inconsiste...

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Problems solved by technology

[0004] The above-mentioned continuous process adopts the diazotization production process with multiple reactors in series. In order to ensure the complete diazo reaction, more reactors in series are often required, and the reactors occupy a large area.

At the same time, multiple reactors are connected in series, and the overflow method is adopted. There are cases where the diazotization reagent overflows to the next stage while the aromatic amine is still trapped in the upper reactor. Over time, the actual diazo component in the diazo transfer tank is relatively small. , thus affecting the subsequent coupling reaction

[0005] The patent specification with the publication number CN101870824A discloses a technical solution for diazotization reaction using a high-gravity reactor, but it does not improve the adaptability of the high-gravity reactor, and the overall system and process need to be further optimized and improved

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