Unlock instant, AI-driven research and patent intelligence for your innovation.

Oscillation tube type reactor for liquid phase oxidization of cyclohexane and application method thereof

A tubular reactor and liquid-phase oxidation technology, which is applied in the field of continuous liquid-phase catalytic oxidation of cyclohexane to produce cyclohexanol and cyclohexanone, can solve the problem that the selectivity and conversion rate of cyclohexane oxidation target products decrease, and the plug flow The problems of temperature inhomogeneity and large temperature gradient along the radial direction can solve the problems of uneven temperature and concentration distribution, shorten the residence time and shorten the induction period.

Active Publication Date: 2013-04-24
上海立科化学科技有限公司
View PDF10 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the disadvantages of high equipment investment and high operating costs in the existing process, but the disadvantage is that the biggest defect of plug flow is the inhomogeneity of temperature in the axial and radial directions
However, in a strict plug flow reactor, the mass transfer rate along the radial direction is very low, and the transfer of reaction heat can only be carried out by heat conduction, resulting in a relatively large temperature gradient along the radial direction, and serious temperature inhomogeneity in the reactor.
This will directly lead to the decline of the selectivity and conversion of cyclohexane oxidation target product

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Oscillation tube type reactor for liquid phase oxidization of cyclohexane and application method thereof
  • Oscillation tube type reactor for liquid phase oxidization of cyclohexane and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Adopt the cooling sequence along the direction of reactant transport, from the reaction liquid inlet section 2 to the outlet section 5 of the oscillating tube reactor, the temperature decreases uniformly and gradually, with a temperature difference of 10°C. The temperature at the top of the oscillating tube reactor is 165°C and the pressure is 16 atm. Cyclohexane is oxidized by oxygen-depleted air with an O2 mass percentage of 10% under non-catalytic conditions. By adjusting the feed rate of the liquid-phase cyclohexane, it was ensured that the residence time of the liquid-phase reaction materials in the oscillating tube reactor was 0.95 hours. The oscillating tube reactor tube is provided with conical ring baffles 6 arranged in an orderly vertical direction, with a cross-shaped damping internal member 12 in the middle of the cone ring baffles, and a side line gas phase feed pipe 3 at the bottom of the reaction tube 4 . By adjusting the ventilation rate, the molecular o...

Embodiment 2

[0045] An isothermal sequence along the direction of reactant transport is employed. The temperature at the top of the oscillating tube reactor is 150°C, the pressure is 14atm, and cyclohexane is oxidized by oxygen-deficient air with an O2 mass percentage of 15% under the condition of 30ppm cobalt acetate as a catalyst. By adjusting the feed rate of liquid-phase cyclohexane, it was ensured that the residence time of the liquid-phase reaction materials in the oscillating tube reactor was 0.6 hours. The oscillating tube reactor tube is provided with circular baffles 6 arranged in an orderly vertical direction, a cross-shaped damping internal member 12 is arranged in the middle of the cone ring baffles, and a side line gas phase feed pipe 3 is provided at the bottom of the reaction tube 4. Two side line gas phase feed pipes 3 are arranged on the side of the reaction pipe 4 . By adjusting the ventilation rate, the molecular oxygen content in the tail gas discharged from the gas p...

Embodiment 3

[0047] Adopt the cooling sequence along the direction of reactant transport, from the reaction liquid inlet section 2 to the outlet section 5 of the oscillating tube reactor, the temperature decreases uniformly and gradually, with a temperature difference of 3°C. The temperature at the top of the oscillating tube reactor is 147° C., the pressure is 12 atm, and cyclohexane is oxidized by air under the condition of 60 ppm manganese acetylacetonate as the catalyst. By adjusting the feed rate of the liquid-phase cyclohexane, the residence time of the liquid-phase reaction materials in the oscillating tube reactor was ensured to be 0.4 hours. The oscillating tube reactor tube is provided with conical ring baffles 6 arranged in an orderly vertical direction, and a cross-shaped damping internal member 12 is arranged in the middle of the conical ring baffles, and a side line gas phase feed pipe 3 is provided at the bottom of the reaction tube 4, Three side line gas phase feed pipes 3 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an oscillation tube type reactor for liquid phase oxidization of cyclohexane and an application method of the oscillation tube type reactor. The oscillation tube type reactor comprises an oscillation generator, a reactant liquid inlet section, a reaction tube and an outlet section connected in sequence, wherein the reactant liquid inlet section is provided with a liquid inlet; the outlet section is provided with a liquid phase outlet; the reaction tube is composed of round tubes vertically mounted; a heat exchange jacket is arranged on the outer wall of the tube; baffles arranged orderly along the vertical direction are arranged in the tube; a space in the tube is divided into a multi-chamber structure; the reaction tube is provided with a side gas feed tube and a gas phase outlet; and a damping internal component is arranged in the center of each baffle. The oscillation tube type reactor disclosed by the invention is simple in structure, saves investment on equipment, has low operation cost, can remarkably increase cyclohexane transformation rate and target product selectivity, wherein the total transformation rate of the cyclohexane is higher than 4.96% and up to 6.89%; the total selectivity of cyclohexanol and cyclohexanone is higher than 93.6% and up to 97.7%.

Description

technical field [0001] The invention relates to a reactor for liquid-phase oxidation of cyclohexane and its use method, in particular to a liquid-phase continuous catalytic oxidation of cyclohexane in an oscillating tube reactor to produce cyclohexanol and cyclohexanone (commonly known as KA oil) Methods. Background technique [0002] The reaction of cyclohexane liquid-phase air oxidation to cyclohexanone and cyclohexanol (commonly known as KA oil) is one of the important oxidation reactions in the petrochemical field. At present, the main production method in the industry is liquid-phase non-catalytic oxidation method, which is to directly oxidize cyclohexane with air to produce peroxide under the conditions of reaction temperature of 160~1700C, reaction pressure of 9~12atm and reaction time of 40~60 minutes. , peroxide decomposes under alkaline conditions to produce KA oil. Since the oxidation process needs to be carried out under high temperature and high pressure condi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J19/24B01J8/00C07C27/12
Inventor 王勤波夏仲平舒文晓毛炳炎董阳军叶翔
Owner 上海立科化学科技有限公司