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

A technology of o-sec-butylphenol and polymerization inhibitor, applied in 4 fields, can solve problems such as increased production risk, and achieve the effect of reducing the number of operators, reducing the influence of human factors, and reducing the size of the reaction equipment

Inactive Publication Date: 2009-08-19
天津瑞泰精细化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This increases the risk of production

Method used

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

Examples

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Embodiment

[0023] Connect 5 small enamel kettles of 100-500L in series by utilizing the potential difference, and the reaction materials o-sec-butylphenol, sulfuric acid, and nitric acid are set at a molar ratio of sulfuric acid to o-sec-butylphenol of 1:1.2-1.4, nitric acid and o-sec The butylphenol molar ratio is 1:2.2-3.2, and the amount is continuously added to the reactor equipment in sequence through the metered flow rate, and the temperature is controlled by the ice-salt water vapor. 97%-98% o-sec-butylphenol passes through the flowmeter at 0.10-0.25m per hour 3 Enter the R-1 sulfonation tank, and at the same time, 70%-90% sulfuric acid flows at 0.05-0.125m per hour 3 Enter the R-1 sulfonation tank for sulfonation reaction, the temperature is controlled at 40-60°C. It flows into the R-2 sulfonation tank through the potential difference for further reaction, and the temperature is controlled at 70-90°C. Flow into the R-3 tank through the potential difference, and at the same time...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C205/23C07C201/08C09K15/20
Inventor 南海军
Owner 天津瑞泰精细化工有限公司
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