C2 post-hydrogenation acetylene removing method

A technology for selective hydrogenation and acetylene, applied in the fields of hydrocarbons, chemical instruments and methods, hydrogenation to hydrocarbons, etc., can solve the problems of harsh conditions, high reaction temperature, low conversion rate of acetylene, etc., and achieve good operation flexibility and reactivity. Moderate and good ethylene selectivity

Active Publication Date: 2017-07-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is to prepare intermetallic compounds under high temperature conditions for selective hydrogenation of acetylene. The conversion rate of acetylene is low and the reaction temperature is high, which is not conducive to industrial application.
And the catalyst is prepared by hot melting method, the conditions are harsh
[0027] To sum up, the selective hydrogenation of low-carbon alkynes and dienes currently mainly uses noble metal catalysts, and a lot of work has been done on the research and development of non-noble metal catalysts, but there is still a long way to go before industrial applications

Method used

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  • C2 post-hydrogenation acetylene removing method
  • C2 post-hydrogenation acetylene removing method
  • C2 post-hydrogenation acetylene removing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Weigh a clover-shaped α-alumina carrier of Φ4.5×4.5mm. Take ferric nitrate, heat and dissolve it in 60ml deionized water, adjust the pH value to 2.5, impregnate the equal volume on the surface of the carrier at the temperature of 50°C, flip the carrier quickly for 6 minutes, let it rest for 30 minutes until the adsorption equilibrium, and age at 60°C for 30 minutes, then in In the oven follow the procedure: Dry the catalyst, and then use the temperature programming method to activate the catalyst. The activation procedure: Weigh lanthanum nitrate and impregnate according to the above preparation steps.

[0086] Before the catalyst is used, it is reduced with 40% hydrogen + 60% nitrogen in a reduction furnace, the reduction temperature is 300° C., the pressure is 0.5 MPa, and the reduction time is 4 hours. The catalyst is packed in an adiabatic bed reaction device.

[0087] The post-hydrogenation process is adopted, and the process flow chart is as attached figur...

Embodiment 2

[0092] At 50°C, the NaAlO 2 solution and ZrCl 4 The solution was stirred and mixed, then neutralized with nitric acid solution, stirred for 10 hours, and uniform Al-Zr particles were formed by co-precipitation. The resultant was filtered and the Na in it was washed with deionized water + and Cl - Ions, and then add an appropriate amount of polyvinyl alcohol with a mass concentration of 15% as a pore-forming agent, and knead it into shape. Dry at 130°C for 2h, and calcined at 650°C for 4h to obtain a Zr-Al composite support. The mass ratio of alumina to zirconia in the carrier is 4:1.

[0093] The catalyst was prepared with alumina-zirconia composite carrier. Take ferric chloride and potassium chloride, heat and dissolve them in deionized water, adjust the pH value to 2.0, impregnate the excess on the carrier at a temperature of 80°C, shake the beaker for 10 minutes, filter off the excess impregnating liquid, and place the catalyst in a water bath at 60°C Medium aging for...

Embodiment 3

[0100] The spherical alumina of Φ1.5 mm was weighed to prepare the catalyst. Dissolve ferric nitrate in deionized water, adjust the pH value to 3.0, soak the liquid at a temperature of 40°C, spray it on the carrier with a watering can, load it for 10 minutes to make the active components evenly loaded, and then follow the procedure in the oven: Dry the catalyst, and use the temperature programming method to activate the catalyst. The activation procedure: Obtain a catalyst dip.

[0101] Using the same method as the first step, take cerium nitrate, dissolve it, spray it on the surface of the catalyst, dry it, and roast it to obtain the final catalyst. Drying procedure: Roasting procedure:

[0102] Before the catalyst is used, it is reduced with 20% hydrogen in a reduction furnace, the reduction temperature is 340° C., the pressure is 0.5 MPa, and the reduction time is 4 hours. Catalyst XRD analysis after reduction is attached figure 2 shown. The catalyst is packed...

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Abstract

The invention discloses a C2 post-hydrogenation acetylene removing method. A column top effluent from a deethanizer in a C2 post-hydrotreatment device is fed into a thermal insulation reactor for selective hydrogenation, and thus acetylene in the effluent can be removed. A Fe family selective hydrogenation catalyst is adopted as a hydrogenation catalyst, a high temperature resistant inorganic oxide is adopted as a carrier, and hydrogenation raw materials mainly consist of 0.98-2.2% of acetylene, 11.2-30.3% of ethane and 65.0-85.0% of ethylene. The reaction conditions are that the inlet temperature of a thermal insulating bed reactor is 40-100 DEG C, the reaction pressure is 1.5-2.5MPa, and the gas volume airspeed is 2000-10000 h<-1>. The C2 post-hydrogenation acetylene removing method disclosed by the invention is moderate in catalyst reaction activity, good in operation elasticity and good in ethylene selectivity, and the 'green oil' generation amount is far less than that of an acetylene removing method using a noble metal catalyst.

Description

technical field [0001] The invention relates to a method for hydrogenation and removal of acetylene after C2, in particular to a method for hydrogenating acetylene contained in ethylene material into ethylene with an Fe-based catalyst. Background technique [0002] The production of polymer grade ethylene is the leader of the petrochemical industry, and polymer grade ethylene and propylene are the most basic raw materials for downstream polymerization units. Among them, the selective hydrogenation of acetylene has an extremely important impact on the ethylene processing industry. In addition to ensuring that the acetylene content at the outlet of the hydrogenation reactor reaches the standard, the selectivity of the catalyst is excellent, which can make ethylene generate as little ethane as possible, which is beneficial to improving the entire process. It is of great significance to improve the ethylene yield of the process and improve the economic benefits of the device. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/167C07C5/09C07C11/04B01J23/83B01J23/78B01J23/745
CPCB01J23/002B01J23/745B01J23/78B01J23/83B01J2523/00C07C5/09C07C7/167C07C2523/745C07C2523/78C07C2523/83C07C11/04B01J2523/31B01J2523/3706B01J2523/842B01J2523/13B01J2523/48B01J2523/3712B01J2523/47B01J2523/41Y02P20/52
Inventor 苟尕莲张峰景喜林谷丽芬车春霞何崇慧钱颖梁玉龙韩伟常晓昕刘俊涛黄德华刘敏
Owner PETROCHINA CO LTD
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