Dinaphthol production continuous neutralization reaction method

Abstract

The invention relates to the technical field of dinaphthol production, and particularly relates to a dinaphthol production continuous neutralization reaction method. The dinaphthol production continuous neutralization reaction method comprises the following steps: controlling flow of a sodium sulfite solution and naphthalene sulfonic acid; inputting the sodium sulfite solution in three times; andafter carrying out five stages of neutralization reaction and alkali regulation, obtaining a final neutralized solution, wherein a molar ratio of the sodium sulfite solution to the naphthalene sulfonic acid is (95 to 98):100 in the overall neutralization reaction process; and sulfur dioxide gas is discharged from the tops of first to fourth stages of neutralization reaction kettles, and is collected for acidification. The internal neutralization reaction temperature in each stage of the neutralization reaction kettles is 95 to 100 DEG C; and the mass ratio of a primary sodium sulfite solutionto a secondary sodium sulfite solution to a tertiary sodium sulfite solution is (1 to 5):(1 to 4):(1 to 2). A reaction device comprises a sodium sulfite solution storage tank, a naphthalene sulfonic acid storage tank, a first stage neutralization reaction kettle, a second stage neutralization reaction kettle, a third stage neutralization reaction kettle, a fourth stage neutralization reaction kettle, a fifth stage neutralization reaction kettle and a neutralized solution tank; and the reaction process is stable, sulfur dioxide is continuously discharged, the flow is uniform and easy to control, and the operation environment is improved.

Description

technical field [0001] The invention discloses a continuous neutralization reaction method for binaphthol production, which belongs to the technical field of binaphthol production. Background technique [0002] Binaphthol is a white flake or white powder chemical substance, which is an organic synthesis raw material and a dye intermediate, and is used in the manufacture of tunic acid, butyric acid, β-naphthol-3-carboxylic acid and azo dyes. It is also the raw material of rubber anti-aging agent, beneficiation agent, bactericide, anti-fungal agent, antiseptic, anti-parasite and anthelmintic drugs, etc. It is also used in spices, leather tanning agents, textile printing and dyeing auxiliaries, etc. [0003] The neutralization reaction in the production of dinaphthol adopts three neutralization reactors with the same structure to operate independently. The naphthalenesulfonic acid after hydrolysis and blowing of naphthalene is pressed into the neutralization reaction kettle w...

AI Technical Summary

Problems solved by technology

Due to the intermittent production, sulfur dioxide is easy to leak into the air of the workshop, resulting in a bad operating environment

Part of the sulfur dioxide is dissolved in the water when the hydraulic jet is vacuumed, which makes the subsequent wastewater treatment more difficult and requires liquid alkali for neutralization, which increases the production cost

Manual switching of valves and sight glass, labor-intensive, poor operating environment

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