Pentane refining method

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 ...

Examples

Embodiment 1

[0047] Take 50g of NaZSM-5 (Si / Al=300) and place it in a 1L four-neck flask, and then add 600mL of aqueous hydrochloric acid solution with a concentration of 0.2mol / L. Heat to 90°C with an electric heating mantle and stir for 4h. Suction filter the treated molecular sieve, fully wash with distilled water, then dry the filter cake in an oven at 120°C for 12 hours, and place it in a muffle furnace for calcination at 500°C for 4 hours to obtain hydrochloric acid modified HZSM-5. Prepare an aqueous solution with a concentration of 0.5 mol / L copper nitrate with distilled water. Weigh 20g of calcined molecular sieve and impregnate the same volume of copper nitrate aqueous solution for 12h, then dry it at 120°C and put it into a muffle furnace. Start from room temperature, heat up to 300°C at a rate of 4°C / min, and then heat up to 300°C at a rate of 2°C. Raise the temperature to 450°C at a rate of 1 / min, keep the temperature at 450°C for 2 hours, then stop heating, and take it out a...

Embodiment 2

[0049] The Cu-HZSM-5 molecular sieve prepared by the embodiment 1 of filling 50mL in the reactor, pentane feed flow rate 0.04mL / min (volume space velocity 0.05h -1 ), the temperature is 30°C, and the pressure is 0.5MPa. The content of unsaturated hydrocarbons in the outlet pentane after the measurement was 6ppm.

Embodiment 3

[0051] The Cu-HZSM-5 molecular sieve prepared by the embodiment 1 of packing 50mL in the reactor, pentane feed flow rate 0.16mL / min (volume space velocity 0.2h -1 ), temperature 0°C, pressure 0.3MPa. The content of unsaturated hydrocarbons in the outlet pentane after the measurement was 7ppm.

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 ...

Examples

Embodiment 1

[0047] Take 50g of NaZSM-5 (Si / Al=300) and place it in a 1L four-neck flask, and then add 600mL of aqueous hydrochloric acid solution with a concentration of 0.2mol / L. Heat to 90°C with an electric heating mantle and stir for 4h. Suction filter the treated molecular sieve, fully wash with distilled water, then dry the filter cake in an oven at 120°C for 12 hours, and place it in a muffle furnace for calcination at 500°C for 4 hours to obtain hydrochloric acid modified HZSM-5. Prepare an aqueous solution with a concentration of 0.5 mol / L copper nitrate with distilled water. Weigh 20g of calcined molecular sieve and impregnate the same volume of copper nitrate aqueous solution for 12h, then dry it at 120°C and put it into a muffle furnace. Start from room temperature, heat up to 300°C at a rate of 4°C / min, and then heat up to 300°C at a rate of 2°C. Raise the temperature to 450°C at a rate of 1 / min, keep the temperature at 450°C for 2 hours, then stop heating, and take it out a...

Embodiment 2

[0049] The Cu-HZSM-5 molecular sieve prepared by the embodiment 1 of filling 50mL in the reactor, pentane feed flow rate 0.04mL / min (volume space velocity 0.05h -1 ), the temperature is 30°C, and the pressure is 0.5MPa. The content of unsaturated hydrocarbons in the outlet pentane after the measurement was 6ppm.

Embodiment 3

[0051] The Cu-HZSM-5 molecular sieve prepared by the embodiment 1 of packing 50mL in the reactor, pentane feed flow rate 0.16mL / min (volume space velocity 0.2h -1 ), temperature 0°C, pressure 0.3MPa. The content of unsaturated hydrocarbons in the outlet pentane after the measurement was 7ppm.