CN-121971946-A - Method for removing trace alcohol in liquefied petroleum gas and application

Abstract

The invention discloses a method for removing trace alcohol in liquefied petroleum gas and application thereof, which belongs to the technical field of liquefied petroleum gas dealcoholization, wherein liquefied petroleum gas raw material containing trace alcohol passes through a solid adsorbent bed layer to fully contact alcohol with solid adsorbent, and is transferred from the liquefied petroleum gas to the solid adsorbent to obtain liquefied petroleum gas product with lower alcohol content, and the strong adsorptivity of the adsorbent to alcohol substances is utilized through the solid adsorbent bed layer, the method can effectively remove trace alcohol in the liquefied petroleum gas, adopts the solid adsorbent to remove the alcohol, has relatively simple and convenient operation process, has better stability and reproducibility, and has smaller influence on the overall quality of the liquefied petroleum gas when removing trace alcohol due to weaker adsorptivity of the solid adsorbent to other components (such as hydrocarbon) in the liquefied petroleum gas, thus avoiding the problem of environmental pollution possibly caused by chemical treatment.

Inventors

• DING HUI
• HOU YANCHUN
• QI LIPING
• LI JIANGANG
• BAI JIANGTAO
• ZHANG WENTAO
• Dou hongcheng
• ZHU JINGDONG
• SUN HAIJUN
• CAO GAIYU
• ZHANG YIXIN
• CHEN YING
• ZHOU JIYONG
• GUO GE
• HUANG YAN

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260505

Application Date

20241030

Claims (10)

1. 1. A method for removing trace alcohol from liquefied petroleum gas is characterized by that the liquefied petroleum gas raw material containing alcohol impurity is passed through solid adsorbent bed layer so as to make the alcohol impurity fully contact with solid adsorbent so as to obtain the liquefied petroleum gas product.
2. 2. The method for removing trace alcohols from liquefied petroleum gas as set forth in claim 1, wherein said alcohol impurity is methanol.
3. 3. The method for removing trace alcohols from liquefied petroleum gas according to claim 2, wherein the concentration of methanol in the liquefied petroleum gas raw material is 500-50000 ppm.
4. 4. The method for removing trace alcohols from liquefied petroleum gas as set forth in claim 1, wherein said solid adsorbent bed is a resin adsorbent bed.
5. 5. The method for removing trace amounts of alcohol from liquefied petroleum gas according to claim 4, wherein the strong polar functional groups of the resin adsorbent in the resin adsorbent bed layer comprise at least one of hydroxyl groups, carboxyl groups, sulfonic acid groups, amino groups, and quaternary ammonium salt groups.
6. 6. The method for removing trace alcohols from liquefied petroleum gas as set forth in claim 4, wherein said resin adsorbent in said resin adsorbent bed is at least one of polystyrene resin, phenolic resin, polyacrylic resin, and polyvinyl alcohol.
7. 7. The method for removing trace alcohols from liquefied petroleum gas according to claim 1, wherein the liquefied petroleum gas raw material passes through the adsorbent bed at a temperature of-50 to 50 ℃.
8. 8. The method for removing trace alcohols from liquefied petroleum gas according to claim 1, wherein the pressure of the liquefied petroleum gas raw material passing through the adsorbent bed is 0.6-2.5 MPa.
9. 9. The method for removing trace alcohols from liquefied petroleum gas according to claim 1, wherein the residence time of liquefied petroleum gas raw material passing through the adsorbent bed is 0.1-10 h.
10. 10. The use of a method for removing trace alcohols from liquefied petroleum gas according to any one of claims 1 to 9 in removal of trace alcohols from liquefied petroleum gas raw materials.

Description

Method for removing trace alcohol in liquefied petroleum gas and application Technical Field The invention belongs to the technical field of liquefied petroleum gas dealcoholization, and particularly relates to a method for removing trace alcohol in liquefied petroleum gas and application thereof. Background Liquefied petroleum gas, which is a hydrocarbon mixture mainly composed of propane and butane (generally more than 60%) has been widely used as fuel in home life for a long time by virtue of its high heating value, no emission of smoke, no residue of carbon residue, and convenience in operation. However, this mode of application often means that its efficiency of utilization is relatively low and its potential value is not fully exploited. The use direction of liquefied petroleum gas is in need of transformation in the face of the current situation that fossil resources are increasingly exhausted worldwide and environmental challenges caused by the aggravation of greenhouse effect. In the future, liquefied petroleum gas is expected to play a more important role in industrial production, and is converted into chemicals with high added value through advanced chemical processes, such as olefin preparation by cracking, so as to contribute to sustainable development. In conventional fuel applications, lpg often contains traces of methanol. Methanol, a very flammable chemical, produces only carbon dioxide and water after complete combustion, and is environmentally friendly. Therefore, when liquefied petroleum gas is mainly used as fuel, the tiny amount of methanol does not significantly affect the heat value of the liquefied petroleum gas, and the tiny amount of methanol does not cause the emission of toxic and harmful substances. However, as natural gas and its byproducts gradually transition from traditional energy roles to important chemical feedstocks, the presence of methanol begins to exhibit a potential impact on the chemical production process. The influence is mainly reflected in two aspects, namely, methanol can increase adsorption and regeneration burden of the molecular sieve in the pretreatment device, the heating regeneration period of the molecular sieve adsorption tower is prolonged, and the water content of dehydrated dry gas can exceed the design standard (such as 0.1 ppm), which threatens the stable operation of a low-temperature system. Secondly, the methanol can be mixed into products such as ethane, liquefied petroleum gas, stable light hydrocarbon and the like, so that the stability of downstream cracking processing is affected, and the quality of the products is reduced. Particularly, in the process of preparing ethylene by cracking, if methanol is contained in stable light hydrocarbon and liquefied petroleum gas, coking of a cracking furnace, poisoning of a carbon two hydrogenation catalyst and abnormal temperature rise of a methanation reactor can be caused, and the safety production of the device is seriously threatened. More serious, when the methanol content in the liquefied petroleum gas reaches a certain critical value, the index of evaporation residues in the liquefied petroleum gas exceeds the standard, and the quality and market acceptance of the product are further affected. In view of the above, effective removal of trace methanol in liquefied petroleum gas and ensuring that the methanol content in the product meets relevant standards have become a key problem to be solved in the current liquefied petroleum gas chemical industry utilization field. The method is not only related to the quality and market competitiveness of the product, but also is an important ring for guaranteeing the safety, stability and sustainable development of the chemical production process. Disclosure of Invention The invention aims to provide a method for removing trace alcohol in liquefied petroleum gas and application thereof, which are used for solving the technical problem that alcohol impurities in the liquefied petroleum gas exceed standards. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: The method for removing trace alcohol from liquefied petroleum gas is characterized by that the liquefied petroleum gas raw material containing alcohol impurity is passed through solid adsorbent bed layer so as to make the alcohol impurity fully contact with solid adsorbent so as to obtain the liquefied petroleum gas product. Preferably, the alcohol impurity is methanol. Preferably, the concentration of methanol in the liquefied petroleum gas raw material is 500-50000 ppm. Preferably, the solid adsorbent bed is a resin adsorbent bed. Preferably, the strongly polar functional groups of the resin adsorbent comprise at least one of hydroxyl groups, carboxyl groups, sulfonic acid groups, amino groups, quaternary ammonium salt groups. Preferably, the resin adsorbent is at least one of polystyrene resin, phenolic resin, polyacrylic resin, and polyvinyl