Method for continuously producing ethylene sulfide

A continuous technology for ethylene sulfide, which is applied in the field of continuous production of ethylene sulfide, can solve the problems of quality fluctuation, intractable by-product cyanate, and high labor cost, so as to avoid production fluctuation, improve production environment, reduce The effect of pollution

Inactive Publication Date: 2020-01-21
保定加合精细化工有限公司
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Problems solved by technology

[0006] Therefore, the purpose of the present invention is to provide a clean, non-toxic cyanide solution for the problems of the by-product cyanate in the current production process of thiolane, and the problems of high product yield, quality fluctuation and labor cost due to intermittent feeding. Ethylene sulfide production method that pollutes, has stable production indicators, employs less people, and is conducive to scale-up of industrialization

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  • Method for continuously producing ethylene sulfide

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Embodiment 1

[0029] The present embodiment adopts the method of the present invention to prepare sulfide.

[0030] refer to figure 1 In the equipment for continuous production of sulfide shown, the continuous reactor 1 adopts the shape of an inverted cone (the ratio of the radius to the height of the upper top is 1:8). The ethylene sulfide continuous production equipment comprises: a continuous reactor 1, a feeding tank 2 connected to the upper end of the continuous reactor 1 and an insulated storage tank 3, a solid waste collector 4 connected to the lower end of the continuous reactor 1, and a solid waste collector 4 connected to the continuous reactor 1. 1. A condenser connected to the air outlet at the upper end, and a gas-liquid separator connected to the condenser.

[0031] Preheat the continuous reactor 1 to 130°C, turn on the spiral scraper 5 for stirring, and at the same time turn on the oscillator 6, sodium thiocyanate enters the continuous reactor 1 from the feeding tank 2, and ...

Embodiment 2

[0037] The present embodiment adopts the method of the present invention to prepare sulfide. Referring to Example 1 and figure 1 In the shown equipment for continuous production of sulfide, the continuous reactor adopts an inverted frustum shape with a ratio of upper top radius to height of 1:8.5.

[0038] Preheat the continuous reactor 1 to 110°C, turn on the spiral scraper 5 for stirring, and at the same time turn on the oscillator 6, sodium thiocyanate enters the continuous reactor 1 from the feeding tank 2, and ethylene carbonate is misted through the liquid atomizer 7 Add continuous reactor 1 after melting, adjust meter, make sodium thiocyanate and ethylene carbonate enter continuous reactor 1 according to molar ratio 1:1. The generated ethylene sulfide is condensed and collected in a liquid collector through a gas-liquid separator for further preparation of diethylaminoethanethiol.

[0039] After the reaction entered a steady state, the continuous 8-hour production data ...

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Abstract

The invention provides a method for continuously producing ethylene sulfide. The method comprises the following steps of: forming a substrate; continuously adding ethylene carbonate and thiocyanate into a continuous reactor of which the temperature is controlled to be 90-140 DEG C; carrying out a reaction to generate ethylene sulfide and cyanate under the stirring action, continuously dischargingthe generated ethylene sulfide from a gas outlet of the reactor, and carrying out condensation and separation to obtain liquid ethylene sulfide, and continuously discharging the generated cyanate fromthe bottom of the reactor. Through continuous reaction, an intermittent kettle type reaction in the prior art is improved into a continuous reactor, raw materials instantaneously react at the reaction temperature, generated epithioethane is rapidly separated from other substances, and generated cyanate powder is discharged from the bottom of the reactor under the action of gravity and screw propulsion of a stirrer by a wall scraping screw. The method is clean, pollution-free, stable in production index, low in labor consumption and beneficial to industrial scale-up production.

Description

technical field [0001] The invention relates to a method for continuous production of ethylene sulfide. Background technique [0002] At present, the mainstream process route for domestic production of diethylaminoethanethiol is to react ethylene carbonate with thiocyanate to generate ethylene thiolane, and then react diethylamine with thiolane to generate diethylaminoethanethiol. [0003] The two patents CN201710497589 and CN201710497588 both made the same improvement on the method of preparing sulfide. The method of intermittent feeding was adopted to increase the yield of sulfide by controlling the reaction speed and effectively separating the product from carbon dioxide. Batch reaction to produce thiocyanate is the reaction of ethylene carbonate and thiocyanate to generate thiocyanate. During the reaction, ethylene carbonate is liquid, thiocyanate is solid, and ethylene carbonate is both a reaction raw material and a solvent. Phase, the thiocyanate is fully mixed with i...

Claims

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Application Information

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IPC IPC(8): B01J4/00C07D331/02
CPCB01J4/007C07D331/02B01J2204/002
Inventor 余伟边玉巍李哲李佳王宁宁
Owner 保定加合精细化工有限公司
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