公开(公告)号：US20250164457A1

公开(公告)日：2025-05-22

申请号：US19034053

申请日：2025-01-22

Applicant: NORTHWEST INSTITUTE OF ECO-ENVIRONMENT AND RESOURCES, CAS

Inventor： Huifei TAO ,  Dongzheng MA ,  Zhen QIN ,  Chengfu LV ,  Zhongping LI ,  Long SU

IPC: G01N33/22 ,  G01N1/42 ,  G01N1/44 ,  G01N30/72

Abstract: A semi-closed pyrolysis system, including a liquid nitrogen freezing device, a gas-liquid collector and a pyrolysis gas collecting device. The liquid nitrogen freezing device includes a collecting vessel, a liquid nitrogen storage, an air inlet pipe, an air outlet pipe and a temperature detector. The collecting vessel is arranged in the liquid nitrogen storage container, and is provided with a stainless steel cap. The stainless steel cap is provided with three holes respectively for the air inlet pipe, the air outlet pipe and the temperature detector to pass through. The air inlet pipe and the air outlet pipe are each provided with a valve. The temperature detector includes a probe and a temperature sensor electrically connected with the probe. The probe extends into the collecting vessel. A method for determining carbon isotope composition of light hydrocarbon monomers based on such system is further provided.