A kind of separation method of propylene/propane

A separation method and propane technology, applied in the field of chemical materials, can solve the problems of high energy consumption, difficult separation, and inability to separate propane and propylene

Active Publication Date: 2021-08-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, propane is the most important impurity, and its boiling point is only 5°C higher than that of propylene. It is difficult to separate it by conventional low-temperature rectification methods, and the existence of propane will seriously affect the polymerization reaction of propylene in the next step.
In order to obtain relatively pure propylene in industry, multi-stage rectification is often carried out, so the energy consumption is too large
Propane and propylene not only have close boiling points, but also their molecular polarity, polarizability, molecular dynamics diameter and other basic physical properties are very close. Traditional activated carbon, silica gel, molecular sieve and other adsorbents are not capable of separating propane and propylene.

Method used

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  • A kind of separation method of propylene/propane
  • A kind of separation method of propylene/propane
  • A kind of separation method of propylene/propane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] First, 10g FAU type 13X molecular sieve (SiO 2 / Al 2 o 3 =2.47), under the condition of water bath at 60°C, ion exchange was carried out with 400ml concentration of 1M zinc nitrate aqueous solution for 2h, washed and dried. The exchanged molecular sieve was reacted with 14 g of 2-methylimidazole at 60°C for 4 hours, washed with deionized water until neutral, and dried to obtain an adsorbent, marked as 1#. Under the conditions of 25°C and 100KPa, the adsorption capacity of propylene and propane of the obtained product are respectively 10.45cm 3 / g and 3.65cm 3 / g, the equilibrium separation ratio of propylene propane is 2.86.

Embodiment 2

[0067] First, 10g FAU type Na-Y molecular sieve (SiO 2 / Al 2 o 3 =5.45), under the condition of water bath at 60°C, ion exchange was carried out with 400 ml of 1M copper chloride aqueous solution for 4 hours, washed and dried. The exchanged molecular sieves were reacted with 16 g of 2-ethylimidazole at 60°C for 4 hours, washed with deionized water until neutral, and dried to obtain an adsorbent, marked as 2#. Under the conditions of 25°C and 100KPa, the adsorption capacity of propylene and propane of the obtained product are respectively 11.35cm 3 / g and 3.96cm 3 / g, the equilibrium separation ratio of propylene propane is 2.87.

Embodiment 3

[0069] First, 10g of MOR molecular sieve (SiO 2 / Al 2 o 3 =13.76), under the condition of water bath at 50°C, ion exchange was carried out with 400ml concentration of 1M indium nitrate aqueous solution for 8h, washed and dried. The exchanged molecular sieves were reacted with 18 g of 2-ethylimidazole at 60°C for 4 hours, washed with deionized water until neutral, and dried to obtain an adsorbent, marked as 3#. Under the conditions of 25°C and 100KPa, the adsorption capacity of propylene and propane of the obtained product are respectively 19.66cm 3 / g and 4.57cm 3 / g, the equilibrium separation ratio of propylene propane is 4.3.

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Abstract

The present application discloses a method for separating propylene / propane, which is characterized in that the separation is adsorption separation; the adsorbent used in the adsorption separation includes modified molecular sieves modified by imidazole compounds. The method described in this application has high selectivity to propylene, and the separation ratio of propylene / propane is as high as 4.3 or more, which reflects the high-efficiency propylene / propane adsorption and separation performance, can realize the effective separation of propylene / propane in pressure swing adsorption, and meets the requirements of industrial pressure swing adsorption Separation of propylene / propane requirements reduces industrial operating costs.

Description

technical field [0001] The application relates to a separation method of propylene / propane, which belongs to the field of chemical materials. Background technique [0002] Propylene is an important petrochemical basic raw material second only to ethylene, and is mainly used to produce chemicals such as polypropylene, acrylonitrile, and propylene oxide. In the past 10 years, driven by the rapid growth of market demand for downstream products, global propylene consumption has increased significantly. Steam cracking co-production of propylene is the main source of global propylene resources, accounting for 2 / 3 of its total output. The propylene produced by steam cracking co-production is based on C 1 -C 4 It exists in the form of low carbon hydrocarbon mixture. Among them, propane is the most important impurity, and its boiling point is only 5°C higher than that of propylene. It is difficult to separate it by conventional low-temperature rectification methods, and the exist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/13C07C11/06C07C9/08B01D15/36B01J20/30B01J20/18
CPCB01D15/361B01J20/186C07C7/13C07C11/06C07C9/08
Inventor 吴雅琪袁丹华陈兆安徐云鹏刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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