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Method for synchronizing low-level mercaptan

A synthesis method and thiol technology, which are applied in thiol preparation, chemical recovery, organic chemistry, etc., can solve the problems of poor catalyst selectivity and activation, high production process safety, low product yield, etc., and achieve product yield. High, low energy consumption, high safety effect

Active Publication Date: 2012-11-07
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The preparation of mercaptans in the prior art is carried out under high temperature and pressure, resulting in large energy consumption, poor catalyst selectivity and activation, low product yield, and high production costs. The present invention provides a method for synthesizing low-level mercaptans , gaseous olefins and hydrogen sulfide gas react under the synergistic effect of plasma and catalyst under normal temperature and pressure, which makes the catalyst have high selectivity, long service life, high product yield, low production cost, and high safety in the production process

Method used

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  • Method for synchronizing low-level mercaptan
  • Method for synchronizing low-level mercaptan
  • Method for synchronizing low-level mercaptan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The dried and purified by-products of the petrochemical industry, propylene and hydrogen sulfide gas, adjust the molar ratio of the flow control material to be propylene: hydrogen sulfide = 1.0: 1.0, and enter the static pipeline mixer to fully mix and evenly adjust the temperature of the mixed gas to 20°C to 0.1min -1 The space velocity continuously enters the plasma reaction chamber filled with transition metal oxide catalysts that has been evacuated from the air. The system reaction temperature is 20°C, the reaction pressure is -0.08MPa, and the dielectric barrier plasma is used as the plasma power supply. The following chemical reactions take place in the plasma reaction chamber:

[0032]

[0033] The reactants pass through the condensation recovery device, and after condensation and separation, the liquid phase enters the crude product storage tank, and the gas phase is compressed and recovered for recycling. The crude product phase was distilled and the fracti...

Embodiment 2

[0036] The dried and purified by-products of the petrochemical industry, propylene and hydrogen sulfide gas, adjust the flow rate to control the material molar ratio to be propylene:hydrogen sulfide=1.0:2.0, and enter the static pipeline mixer to fully mix evenly, and at the same time adjust the temperature of the mixed gas to 30°C to 1min -1 The space velocity continuously enters the plasma reaction chamber filled with activated carbon-loaded ionic liquid that has been evacuated from the air, and the glow plasma is used as the plasma power supply. The following chemical reactions take place in the plasma reaction chamber:

[0037]

[0038] The reactants pass through the condensation recovery device, and after condensation and separation, the liquid phase enters the crude product storage tank, and the gas phase is recovered and compressed for recycling. The crude product phase is distilled and the fraction at 57-60°C is collected.

[0039] The product obtained by mass spe...

Embodiment 3

[0041] The dried and purified petrochemical industry by-products 2-butene and hydrogen sulfide gas, adjust the flow rate to control the molar ratio of the materials to be 2-butene: hydrogen sulfide = 1.0: 1.0, enter the static mixer to fully mix and evenly adjust the temperature of the mixed gas to 10℃, take 50min -1 The space velocity continuously enters the plasma reaction chamber filled with molecular sieve-loaded phosphotungstic heteropoly acid that has been evacuated, and the low-temperature plasma is used as the plasma power supply. The following chemical reactions take place in the plasma reaction chamber:

[0042]

[0043] The reactants pass through the condensation recovery device, and after condensation and separation, the liquid phase enters the crude product storage tank, and the gas phase is compressed and recovered for recycling. Distill the crude product phase, and collect fractions at 80-95°C.

[0044] The product obtained by mass spectrometry and infrared...

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Abstract

The invention discloses a method for directly producing low-level mercaptan by byproducts of the petrochemical industry, including gaseous olefin and hydrothion gas. The method includes the following steps of sufficiently mixing gaseous olefin and hydrothion gas in a static pipeline mixer, subjecting the mixed gas to react in a plasma reaction bin at normal temperature and normal pressure, separating and purifying to obtain target products. Conditions of reaction at the normal temperature and normal pressure are mild, and the method is high in safety, low in cost and high in yield.

Description

technical field [0001] The invention relates to a method for synthesizing mercaptans, in particular to a method for synthesizing lower mercaptans. Background technique [0002] Lower mercaptans are important chemical intermediates, widely used in pesticides, pharmaceuticals, rubber, plastics, spices and flavors and other industries. [0003] In the prior art, the preparation of lower mercaptans is mainly obtained by the addition reaction of hydrogen sulfide and corresponding olefins under high temperature and high pressure, and the chemical reaction formula is expressed as follows: [0004] [0005] where R, R ’ is H, CH 3 -, CH 3 CH 2 - one of a kind. The disadvantage of this method is that the reaction is carried out under high temperature and high pressure, and the energy consumption is large; the catalyst is easily poisoned, the selectivity and activation are poor, and the product yield can only reach 20-80% by using this method, and the production cost is relati...

Claims

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Application Information

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IPC IPC(8): C07C319/04C07C321/04
CPCY02P20/582
Inventor 柳金章吴文雷史庆苓马韵升栾波高洪奎
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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