Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method using acetylene hydrogenation to produce ethylene

A technology for acetylene hydrogenation and ethylene production, which is applied in the field of acetylene hydrogenation to ethylene, which can solve the problems of difficult recovery, wear and tear of catalyst loss, easy blockage of equipment, etc., and achieve the effect of simple operation and reduced crushing and loss

Inactive Publication Date: 2015-12-16
BEIJING HUAFU ENG
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using water as the liquid phase solvent is not conducive to the dissolution of acetylene and the uniform distribution of the catalyst. The saturated vapor pressure of water is low, and the phase change is prone to occur, resulting in a high water content in ethylene; and the green oil formed on the surface of the catalyst is insoluble in water.
However, if the solvent for dissolving acetylene is selected, more acetylene will be dissolved in the liquid phase, which will promote the adsorption of more acetylene on the active center of the catalyst. yield drop
Moreover, because the solid catalyst is dispersed in the liquid phase, it is easily broken under gas disturbance and flow state, and the wear and tear is carried by the liquid phase product to cause the loss of the catalyst; when the catalyst is regenerated, it is difficult to filter, recycle and Easy to block equipment and other problems

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
  • Method using acetylene hydrogenation to produce ethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for producing ethylene by hydrogenation of acetylene, comprising the steps of:

[0031] (1) Hydrogenation of acetylene

[0032] The non-polar organic solvent, acetylene and hydrogen enter the reactor through the spray device for selective hydrogenation reaction to obtain a gas-liquid mixture containing ethylene, unreacted acetylene, unreacted hydrogen, by-products, and non-polar organic solvent ; Wherein, the catalyst bed is in a rotating state;

[0033] Among them, the pressure of acetylene raw material gas is 0.2MPa, and the flow rate is 6Nm 3 / h;

[0034] Among them, the hydrogen raw material gas pressure is 0.2MPa, the flow rate is 24Nm 3 / h;

[0035] Among them, N-methylpyrrolidone (NMP rich solution) is pumped into the reactor, the outlet pressure of the pump is 0.2MPa, and the flow rate is 0.8m 3 / h.

[0036] Wherein, the temperature of the catalyst bed is controlled at 150° C., and the rotation speed of the catalyst bed is controlled to be 500 rpm...

Embodiment 2

[0043] Adopt the method for embodiment 1 to prepare ethylene, difference is:

[0044] 1. The non-polar organic solvent is replaced by a mixture of tetrahydrofuran and acetone;

[0045] 2. Bed speed is 600rpm;

Embodiment 3

[0047] Adopt the method for embodiment 1 to prepare ethylene, difference is:

[0048] 1. The non-polar organic solvent is replaced by a mixture of NMP and acetone;

[0049] 2. The bed speed is 800rmp;

[0050] Using the above examples to carry out the reaction of acetylene hydrogenation to ethylene, the results of acetylene conversion and ethylene selectivity are shown in the table below.

[0051] Example

[0052] It has been verified by experiments that the method of the invention is used to prepare ethylene, no overheating phenomenon occurs in the reaction process, the ethylene yield is high, the catalyst is not easy to be lost in the reaction process, and regeneration is easy.

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 relates to a method using acetylene hydrogenation to produce ethylene. The method includes the steps of firstly, performing acetylene hydrogenation; secondly, performing gas-liquid separation; thirdly, extracting hydrogen. The method has the advantages that non-polarity organic solvent is added into a reactor with a rotary catalyst bed, so that phase change of the formed liquid film can be achieved, part of reaction heat can be taken away, side reaction occurrence in the acetylene hydrogenation reaction is reduced, bed temperature stability is guaranteed, and catalyst bed temperature runaway is avoided; the solvent recycled by separating reaction products can be reused directly, and the method is simple, and convenient to operate.

Description

technical field [0001] The invention relates to a reaction method for producing ethylene by hydrogenation of high-concentration acetylene, which belongs to the technical field of hydrogenation of acetylene to produce ethylene. Background technique [0002] In coal chemical technology, the production of acetylene by calcium carbide method using coal as raw material has been widely used; then acetylene is used as raw material to produce ethylene products by hydrogenation under the action of selective hydrogenation catalyst. However, because acetylene hydrogenation is a strong exothermic reaction, it is difficult for traditional fixed-bed devices and catalysts to transfer heat, resulting in overheating phenomenon, unable to control the depth of acetylene hydrogenation reaction, resulting in deep hydrogenation of acetylene to generate ethane, and a large amount of reaction heat will make The catalyst is deactivated by carbon deposition; in addition, the green oil generated by th...

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): C07C5/09C07C11/04
CPCY02P20/52Y02P20/584
Inventor 闫琛洋杜少春朱元宝吴道洪
Owner BEIJING HUAFU ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products