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Method for selectively hydrogenating acetylene in ethylene under normal pressure

A selective and acetylene technology, applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., can solve the problems of increasing production and operation safety hazards, increasing economic investment, etc., and achieves remarkable treatment effects, environmental friendliness, The effect of good economic benefits

Inactive Publication Date: 2013-01-30
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research results show that the supported Pd catalyst can be further optimized by adding appropriate additives and adjusting the pretreatment conditions to improve the selectivity to ethylene. Substantial improvement in the selectivity of ethylene in the product can be observed by impregnating bimetallic and other methods , but the methods are all realized under pressure
[0005] Because the acetylene selective hydrogenation process is mostly realized under pressurized conditions, higher requirements are placed on the high-pressure resistance performance of the reaction equipment, and the pressurized process increases economic investment and increases safety hazards in production operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of Pd-Ag / TiO by Photodeposition 2 Catalyst, in which the Pd loading is about 1%, and the molar ratio of Pd and Ag is about 1:1. With the above Pd-Ag / TiO 2 As a catalyst, the selective hydrogenation reaction of acetylene is carried out under normal pressure, and acetylene is converted into ethylene and ethane after hydrogenation. The amount of catalyst is about 50mg, the reaction temperature is 40~120℃, H 2 Accounted for 1.455%, ethylene accounted for 52.605%, acetylene accounted for 0.731%, with helium to balance. The flow rate of the mixed gas is 40~180ml / min. React at normal pressure for 2-10 hours, and use a gas chromatograph equipped with an FID detector for on-line detection. The results show that the selectivity to the target product ethylene is 80~89.0%.

[0026] In the description of the present invention, in the present embodiment and the following examples and comparative examples, the catalyst selectivity is defined as: ×100%.

Embodiment 2

[0037] Pd-Ag / TiO with a Pd loading of about 1% and an atomic molar ratio of Pd and Ag of about 1:0.5 prepared by photodeposition 2 As a catalyst, the selective hydrogenation of acetylene is carried out under normal pressure. The amount of catalyst is about 50mg, the reaction temperature is 40~120℃, H 2 Accounted for 1.455%, ethylene accounted for 52.605%, acetylene accounted for 0.731%, with helium to balance. The flow rate of the mixed gas is 40~180ml / min. Normal pressure reaction 2~10h, catalyst selectivity -10~10%.

[0038] It can be seen that compared with the single Pd catalyst, the addition of Ag effectively changed the selectivity of the catalyst to ethylene.

Embodiment 3

[0040] Pd-Ag / TiO with a Pd loading of about 1% and an atomic molar ratio of Pd and Ag of about 1:1.5 prepared by photodeposition 2 As a catalyst, the selective hydrogenation of acetylene is carried out under normal pressure. The amount of catalyst is about 50mg, the reaction temperature is 40~120℃, H 2 Accounted for 1.455%, ethylene accounted for 52.605%, acetylene accounted for 0.731%, with helium to balance. The flow rate of the mixed gas is 40~180ml / min. Normal pressure reaction 2~10h, the selectivity of the catalyst is 90~97%.

[0041] It can be seen that as the content of Ag increases, the selectivity of the catalyst to ethylene increases.

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Abstract

The invention discloses a method for selectively hydrogenating acetylene in ethylene under normal pressure. Ethylene mixed gas containing the acetylene is subjected to gas phase hydrogenation under normal pressure by using bimetallic A-B / TiO2 as a catalyst, the acetylene is selectively hydrogenated and reduced into ethylene, and the catalyst is an A-B / TiO2 catalyst obtained by a continuous bimetal photo-deposition method, wherein A is Pd, Pt, Au or Rh, and B is Ag, Cu or Ni. The A-B / TiO2 catalyst is used for selectively hydrogenating the acetylene under normal pressure, the ethylene can be reduced under the mild condition to form a hydrocarbon using the ethylene as a main product, and the selectivity of the catalyst is 80 to 97 percent. The method has technical feasibility, does not have secondary pollution, has a remarkable effect of selectively hydrogenating the acetylene in the ethylene, and has high economic and environmental benefits.

Description

technical field [0001] The invention relates to a method for removing acetylene in ethylene, in particular to a method for realizing selective hydrogenation of acetylene in ethylene under normal pressure. Background technique [0002] With the development of the economy, the importance of ethylene in industrial production has become increasingly prominent, and its output has become an important symbol to measure the development level of a country's oil industry. Ethylene mainly participates in chemical production in the form of monomers. During the reaction process of synthesizing high polymers, since ethylene comes from hydrocarbon steam cracking method, the outlet gas of cracking furnace contains 0.1%~0.5% acetylene, which is used in the production of polyolefins. Ziegler-Natta catalysts are easily deactivated, and the presence of acetylene can also lead to poor performance of polymerization products, so the removal of small amounts of acetylene in ethylene has attracted a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C7/167B01J23/50
CPCY02P20/52
Inventor 朱东强韩玉香郑寿荣许昭怡万海勤万玉秋彭渡周娟王文娟
Owner NANJING UNIV
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