A kind of refining method of pentane

Abstract

The invention provides a pentane refining method. The pentane refining method comprises the following steps: mixing a pentane raw material and a metal-modified HZSM-5 molecular sieve, and refining toobtain refined pentane, wherein in the metal-modified HZSM-5 molecular sieve, modifying metal is copper or silver. According to the invention, the metal-modified HZSM-5 molecular sieve is used as a pentane refining agent, the refining method is simple, the energy consumption is low, and after refining, the content of unsaturated hydrocarbon is lower than 10 ppm; in addition, the pentane refining agent provided by the invention is recyclable, a pentane product obtained after recycling meets index requirements of the unsaturated hydrocarbon, the recycling condition is mild, and the recycling time is short.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and in particular relates to a method for refining pentane. Background technique [0002] Pentane products have a wide range of uses, and can be used as refrigerants for central air conditioners, heat pump air conditioners, household air conditioners, and liquefied natural gas equipment; they can be used as carrier solvents for linear low-density polyethylene catalysts, and desorbents for the separation of alkylbenzenes. Solvent for the synthesis of isoprene rubber, etc.; can be used as a foaming agent for polystyrene and polyurethane foam systems, used in the fields of fluorine-free refrigerators, freezers, cold storage, and pipeline insulation; can be used as an expanding agent for cut tobacco to reduce the consumption of tobacco leaves , reduce the amount of tar and nicotine in cigarettes, improve the quality of tobacco leaves and cut tobacco; it can also be used as chemical ...

AI Technical Summary

Problems solved by technology

[0004] The pentane raw material contains 3-methyl-1-butene, 1-pentene, 2-methyl-1-butene and other carbon pentaolefins, especially the difference between the boiling points of 1-pentene and isopentane is only 2.1°C. It is difficult to separate from isopentane by ordinary rectification process, resulting in the unsaturated hydrocarbon content in the product being greater than 5×10 -5 , failing to meet the requirements of the unsaturation index of the polyolefin unit

C5 cracking oil, pentane oil, reformed top oil, etc. can be used to produce and separate pentane, and all of them have industrialized equipment. C5 cracking oil and pentane oil contain more olefin components, and hydrogenation units are required to produce alkanes , high cost, reformed top oil with low sulfur content and unsaturated hydrocarbon content, it is a high-quality pentane separation raw material, and pentane products with high pentane purity and low unsaturated hydrocarbon content can be produced through adsorption purification, petrochemical research Zhang Deshun and others from the Daqing Chemical Research Center of the Academy published a literature report on "Development of Isopentane Production Technology". Using the coupling method of hydrogenation rectification and adsorption separation, unsaturated hydrocarbons can be reduced to 50ppm. The currently reported adsorption Most of the agents can only reduce unsaturated hydrocarbons to about 50ppm, and cannot continue to improve product quality