Continuous production method for 4,6-dinitryl o-sec-butylphenol inhibitor

Abstract

The invention provides a method for continuously producing 4, 6-binitro-o-sec-butylphenol polymerization retarder, comprising the following steps: adopting position difference to connect a plurality of reaction kettle devices in series, continuously adding such reaction materials as o-sec-butylphenol, sulphuric acid and nitric acid into the reaction kettle devices in turn through measuring flow according to a molar rate of the sulphuric acid to the o-sec-butylphenol of 1:1.2-1.4 and a molar rate of the nitric acid to the o-sec-butylphenol of 1:2.2-3.2, controlling the temperature through ice brine steam, and obtaining a product through continuous layering devices; and distillating dilute sulphuric acid generated in the reaction by an efficient porcelain enamel kettle in high vacuum to obtain 70 to 90 percent sulphuric acid for recycling, wherein the yield of the product reaches more than 92 percent. The method has the advantages that the production is continuous and production is easy to control and stable. The method has high automation degree and reduces the effects of human factors. The yield already reaches 92 percent; the using amount of the sulphuric acid is reduced by 60 to 70 percent; the method lowers production cost and lightens three-waste governance load. The reaction equipment is shrunk by 7 to 8 times so as to reduce heat loss, equipment maintenance cost, investment and occupied area. The production is safer and cleaner.

Description

technical field [0001] The invention relates to a method for continuous production of 4,6-dinitro-o-sec-butylphenol polymerization inhibitor, which enables continuous production equipment, makes the product yield more than 92%, and reduces the amount of sulfuric acid used in production by 60% -70%, reduce cost, save energy and reduce consumption. Background technique [0002] 4,6-Dinitro-o-sec-butylphenol is a fine chemical product (molecular weight: 150; it is a yellow solid at room temperature and a viscous liquid above 38°C, and its solubility in water is 0.01% (W / W) at 20 o'clock. Has a pungent aromatic odor; easily soluble in methanol, ether, toluene, styrene; melting point: 38-42°C. [0003] 4,6-Dinitro-2-sec-butylphenol has polymerization inhibitory properties and is mainly used in the petrochemical industry. It is a traditional polymerization inhibitor for high-temperature distillation of styrene and the most economical sulfur-free polymerization inhibitor commonly ...

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